CN111347900B

CN111347900B - Vehicle, motor control circuit and power battery charging and heating method

Info

Publication number: CN111347900B
Application number: CN201811575195.7A
Authority: CN
Inventors: 凌和平; 赵志盟; 谢飞跃; 刘捷宇; 黄日; 其他发明人请求不公开姓名
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2018-12-21
Filing date: 2018-12-21
Publication date: 2021-11-12
Anticipated expiration: 2038-12-21
Also published as: CN111347900A

Abstract

The application provides a vehicle, a motor control circuit and a power battery charging and heating method, the power battery charging method controls a first switch module to be disconnected, a second switch module and a third switch module to be connected and controls a three-phase inverter and an inductive energy storage module when the power supply voltage output by a power supply device is not higher than the voltage of a power battery and the power battery needs to be charged, so that the energy storage process of the inductive energy storage module and the discharging process of the power supply device and the inductive energy storage module to the power battery are alternately carried out by the power supply device, the power battery is charged after the power supply voltage of the power supply device is boosted, the power battery can be boosted and charged without independently setting a boosting circuit, the circuit cost is reduced, the reliability is high, the problems of high cost or low charging reliability of the power battery charging method are solved, and a larger power expansion space is provided, meeting the increased demand of battery charging power.

Description

Vehicle, motor control circuit and power battery charging and heating method

Technical Field

The application relates to the technical field of vehicles, in particular to a vehicle, a motor control circuit and a power battery charging and heating method.

Background

With the development and rapid popularization of vehicles, the charging technology of vehicle power batteries becomes more and more important, and the charging technology needs to meet the requirements of different users, the adaptability to different power batteries and different charging piles, and the compatibility.

At present, the direct current charging of the power battery is generally divided into direct charging and boosting charging. The direct charging means that the positive and negative electrodes of the charging pile are directly connected with the positive and negative buses of the power battery through a contactor or a relay to directly charge the battery, and a voltage boosting or reducing circuit is not arranged in the middle; the boost charging circuit is generally formed by adding and connecting a DC/DC bridge circuit capable of bidirectionally boosting and reducing voltage between a charging pile and a power battery.

However, for direct charging, when the maximum output voltage of the charging pile is lower than the voltage of the power battery, the charging pile cannot charge the battery, so that the reliability in the charging process is reduced; the existing boost charging circuit needs to separately add a DC/DC bridge circuit and corresponding control and detection circuits, which increases the circuit cost. When the battery charging power demand increases, the single DC/DC is difficult to meet the demand of the battery charging power increase, the cost of multiple DC/DC increases more, and the power expansibility is poor.

In summary, the conventional power battery charging method has the problems of high cost, poor charging power expansibility or low charging reliability.

Disclosure of Invention

The application aims to provide a vehicle, a motor control circuit and a power battery charging and heating method, so that the problem that the cost is high or the charging reliability is low in the power battery charging method is solved, a large power expansion space is provided, and the requirement for increasing the charging power of a battery is met.

The present application is achieved as such, and a first aspect of the present application provides a motor control circuit, including:

the input end of the first switch module is connected with the anode of power supply equipment for outputting power supply voltage;

the input end of the second switch module is connected with the negative electrode of the power supply equipment;

the inductive energy storage module is connected with the anode of the power supply equipment and the input end of the first switch module;

the three-phase inverter is connected with the output end of the first switch module, the output end of the inductive energy storage module and the output end of the second switch module;

a three-phase coil of the three-phase alternating current motor is connected with a three-phase bridge arm of the three-phase inverter;

the third switch module is connected with the output end of the first switch module, the output end of the second switch module, the three-phase inverter and the positive electrode and the negative electrode of the power battery;

and the control module is respectively connected with the first switch module, the second switch module, the inductance energy storage module, the three-phase inverter, the three-phase alternating current motor, the third switch module and the power battery.

A second aspect of the present application provides a power battery charging method, where the power battery charging method is implemented based on the motor control circuit of the first aspect, and the power battery charging method includes:

when the power supply voltage output by the power supply equipment is not higher than the voltage of the power battery and the power battery needs to be charged, controlling the first switch module to be switched off, and controlling the second switch module and the third switch module to be switched on;

and controlling the three-phase inverter and the inductive energy storage module, so that the energy storage process of the inductive energy storage module and the discharging process of the power battery by the power supply equipment and the inductive energy storage module are alternately performed, and the power battery is charged after the power supply voltage of the power supply equipment is boosted.

The third aspect of the present application provides a power battery charging method, where the power battery charging method is implemented based on the motor control circuit of the first aspect, and the power battery charging method includes:

the control module controls the three-phase inverter and the inductance energy storage module to charge the power battery to the first capacitor module, and after the power supply device detects the charging voltage of the first capacitor module, the control module controls the three-phase inverter to enable the power supply device to alternately perform the energy storage process of the inductance energy storage module and the discharging process of the power battery by the power supply device and the inductance energy storage module, so that the power battery is charged after the power supply voltage of the power supply device is boosted.

The fourth aspect of the present application provides a power battery heating method, where the power battery heating method is implemented based on the motor control circuit of the first aspect, and the power battery heating method includes:

when the temperature of the power battery is detected to be lower than a preset temperature value, controlling the first switch module and the second switch module to be connected, and controlling the third switch module to be disconnected;

and controlling the three-phase inverter and the inductive energy storage module, so that the energy storage process of the inductive energy storage module and the discharge process of the inductive energy storage module are alternately performed by the power supply equipment, so that the inductive energy storage module and the three-phase inverter generate heat in the discharge process, heat is applied to a heat exchange medium flowing through at least one of the inductive energy storage module and the three-phase inverter, and the temperature of the power battery to be heated is increased when the heated heat exchange medium flows through the power battery again.

The fifth aspect of the present application provides a power battery heating method, where the power battery heating method is implemented based on the motor control circuit of the first aspect, and the power battery heating method includes:

when the temperature of the power battery is detected to be lower than a preset temperature value, controlling the first switch module and the third switch module to be connected, and controlling the second switch module to be disconnected;

and controlling the three-phase inverter and the inductive energy storage module to alternately perform an energy storage process of the inductive energy storage module and a discharge process of the inductive energy storage module by the power battery, so that the inductive energy storage module and the three-phase inverter generate heat in the discharge process to heat a heat exchange medium flowing through at least one of the inductive energy storage module and the three-phase inverter, and when the heated heat exchange medium flows through the power battery again, the temperature of the power battery is increased.

A sixth aspect of the present application provides a power battery heating method, including:

when the temperature of the power battery is detected to be lower than a preset temperature value, controlling the second switch module to be switched on, and controlling the first switch module and the third switch module to be switched off;

controlling the three-phase inverter and the inductive energy storage module to enable the energy storage process of the inductive energy storage module and a three-phase coil of the three-phase alternating current motor by the power supply equipment, the forward charging process of the inductive energy storage module and the three-phase coil of the three-phase alternating current motor on the second capacitor module, the energy storage process of the discharge of the second capacitor module on the three-phase coil of the three-phase alternating current motor and the charging process of the three-phase coil of the three-phase alternating current motor on the second capacitor module to be sequentially and alternately carried out, so that electric energy provided by the power supply equipment generates heat in the working process of the inductive energy storage module, the three-phase inverter and the three-phase alternating current motor, heats a heat exchange medium flowing through at least one of the inductive energy storage module, the three-phase inverter and the three-phase alternating current motor, and when the heated heat exchange medium flows through the power battery again, and raising the temperature of the power battery.

The seventh aspect of the present application provides a power battery heating method, where the power battery heating method is implemented based on the motor control circuit of the first aspect, and the power battery heating method includes:

and controlling the three-phase inverter and the inductance energy storage module, so that the energy storage process of the inductance energy storage module and a three-phase coil of the three-phase alternating current motor and the discharge process of the inductance energy storage module and the three-phase coil of the three-phase alternating current motor are alternately performed by the power supply equipment, so that the inductance energy storage module, the three-phase inverter and the three-phase alternating current motor generate heat in the discharge process, heat is transferred to at least one heat transfer medium in the inductance energy storage module, the three-phase inverter and the three-phase alternating current motor, and the temperature of the power battery is increased when the heated heat transfer medium flows through the power battery again.

An eighth aspect of the present application provides a power battery heating method, including:

when the temperature of the power battery is detected to be lower than a preset temperature value, controlling the third switch module to be switched on, and controlling the first switch module and the second switch module to be switched off;

controlling the three-phase inverter and the inductive energy storage module, so that the energy storage process of the inductive energy storage module and a three-phase coil of the three-phase alternating current motor by the power battery, the charging process of the inductive energy storage module and the three-phase coil of the three-phase alternating current motor to the first capacitor module, the energy storage process of the inductive energy storage module and the three-phase coil of the three-phase alternating current motor by the discharging of the first capacitor module, the reverse charging process of the three-phase coil of the three-phase alternating current motor and the discharging process of the inductive energy storage module by the discharging of the first capacitor module are performed alternately in sequence, so that the electric energy provided by the power battery generates heat in the working processes of the inductive energy storage module, the three-phase inverter and the three-phase alternating current motor, and flows through the inductive energy storage module, And heating the heat exchange medium of at least one of the three-phase inverter and the three-phase alternating current motor, and increasing the temperature of the power battery when the heated heat exchange medium flows through the power battery.

A ninth aspect of the present application provides a vehicle, the vehicle includes the first aspect motor control circuit, the vehicle still includes power battery, coolant liquid case, water pump and water line, the water pump will according to control signal coolant liquid in the coolant liquid case is imported to the water line, the water line passes power battery with motor control circuit.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a motor control circuit according to an embodiment of the present application;

FIG. 2 is a circuit diagram of a motor control circuit according to an embodiment of the present application;

FIG. 3 is a circuit diagram of a motor control circuit according to another embodiment of the present application;

FIG. 4 is a circuit diagram of a motor control circuit according to another embodiment of the present application;

FIG. 5 is a circuit diagram of a motor control circuit according to another embodiment of the present application;

FIG. 6 is a circuit diagram of a motor control circuit according to another embodiment of the present application;

FIG. 7 is a current path diagram of a motor control circuit according to an embodiment of the present application;

FIG. 8 is a further current path diagram of a motor control circuit according to an embodiment of the present application;

FIG. 9 is a schematic flow chart illustrating a method for charging a power battery according to an embodiment of the present disclosure;

FIG. 10 is a block diagram of a motor control circuit according to another embodiment of the present application;

FIG. 11 is a circuit diagram of a motor control circuit according to another embodiment of the present application;

FIG. 12 is a schematic flow chart illustrating a method for charging a power battery according to another embodiment of the present disclosure;

fig. 13 is a circuit diagram of a motor control circuit according to an embodiment of the present application when operating in a direct charging mode;

fig. 14 is a current path diagram of a motor control circuit operating in a first mode of inductively heat generating and heating a power cell according to an embodiment of the present application;

fig. 15 is a current path diagram of a motor control circuit operating in a first mode of inductively heat generating power-generating batteries according to another embodiment of the present application;

FIG. 16 is a schematic flow chart illustrating a method for heating a power cell according to an embodiment of the present disclosure;

fig. 17 is a current path diagram of a motor control circuit operating in a second mode of inductively heat generating and heating a power cell according to an embodiment of the present application;

fig. 18 is a current path diagram of a motor control circuit operating in a second mode for inductively heat generating and powering a battery according to another embodiment of the present application;

FIG. 19 is a schematic flow chart illustrating a method for heating a power cell according to another embodiment of the present disclosure;

FIG. 20 is a block diagram of a motor control circuit according to another embodiment of the present application;

fig. 21 is a current path diagram of a motor control circuit operating in a first mode in which a power unit controls a three-phase ac motor to generate heat for heating a power battery according to an embodiment of the present application;

fig. 22 is a current path diagram of a motor control circuit operating in a first mode where a power supply unit controls a three-phase ac motor to generate heat for heating a power battery according to another embodiment of the present application;

fig. 23 is a current path diagram of a motor control circuit operating in a first mode where a power supply unit controls a three-phase ac motor to generate heat for heating a power battery according to another embodiment of the present application;

fig. 24 is a current path diagram of a motor control circuit operating in a first mode in which a power supply unit controls a three-phase ac motor to generate heat for heating a power battery according to another embodiment of the present application;

FIG. 25 is a schematic flow chart illustrating a method for heating a power cell according to another embodiment of the present disclosure;

FIG. 26 is a current path diagram illustrating a motor control circuit according to an embodiment of the present application operating in a second mode for drawing power from a power supply and controlling a three-phase AC motor to generate heat for heating a power battery;

FIG. 27 is a current path diagram illustrating a motor control circuit operating in a second mode for drawing power from a power supply and controlling a three-phase AC motor to generate heat for heating a power cell according to another embodiment of the present application;

FIG. 28 is a schematic flow chart illustrating a method for heating a power cell according to another embodiment of the present disclosure;

FIG. 29 is a current path diagram illustrating a motor control circuit according to an embodiment of the present application operating in a second mode for drawing power from a power cell and controlling heat generated by a three-phase AC motor to heat the power cell;

FIG. 30 is a current path diagram illustrating a motor control circuit operating in a second mode for drawing power from a power cell and controlling heat generated by a three-phase AC motor to heat the power cell according to another embodiment of the present application;

fig. 31 is a current path diagram of a motor control circuit operating in a power cell controlled three-phase ac motor to generate heat for heating the power cell according to an embodiment of the present application;

FIG. 32 is a current path diagram of a motor control circuit operating with a power cell controlling a three-phase AC motor to generate heat for heating the power cell according to another embodiment of the present application;

FIG. 33 is a current path diagram of a motor control circuit operating in a power cell controlled three-phase AC motor to generate heat for heating the power cell according to another embodiment of the present application;

FIG. 34 is a current path diagram of a motor control circuit operating with a power cell controlling a three-phase AC motor to generate heat for heating the power cell according to another embodiment of the present application;

FIG. 35 is a current path diagram of a motor control circuit operating in a power cell controlled three-phase AC motor to generate heat for heating the power cell according to another embodiment of the present application;

FIG. 36 is a schematic flow chart illustrating a method for heating a power cell according to another embodiment of the present disclosure;

fig. 37 is a schematic structural diagram of a vehicle battery heating system according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In order to explain the technical means of the present application, the following description will be given by way of specific examples.

The embodiment of the present application provides a motor control circuit, as shown in fig. 1, the motor control circuit includes:

a first switching module 11, an input end of the first switching module 11 being connected to a positive pole of a power supply device 10 for outputting a supply voltage;

the input end of the second switch module 12 is connected with the negative electrode of the power supply device 10;

the inductive energy storage module 13 is connected with the positive electrode of the power supply device 10 and the input end of the first switch module 11;

the three-phase inverter 14 is connected with the output end of the first switch module 11, the inductive energy storage module 13 and the output end of the second switch module 12;

a three-phase alternating current motor 15, wherein three-phase coils of the three-phase alternating current motor 15 are connected with a three-phase bridge arm of a three-phase inverter 14;

a third switch module 16 connected to the output terminal of the first switch module 11, the output terminal of the second switch module 12, the three-phase inverter 14, and the positive electrode and the negative electrode of the power battery 20;

and the control module 17 is connected with the first switch module 11, the second switch module 12, the inductance energy storage module 13, the three-phase inverter 14, the three-phase alternating current motor 15, the third switch module 16 and the power battery 20 respectively.

The power supply device 10 may be implemented by a direct current, a single-phase alternating current, or a three-phase alternating current charger, for example, a charging pile, that is, the power supply voltage output by the power supply device 10 may be output by the alternating current charger or output by the alternating current charging pile, and the present disclosure is not limited specifically; three-phase inverter 14 has four operating modes, determined by control module 17, three-phase inverter 14 operating in inverter mode when required for vehicle driving, three-phase inverter 14 operating in boost mode when used for boost charging, three-phase inverter 14 operating in heating mode when used for heating the battery, and three-phase inverter 14 operating in buck mode when required for supplying power to the outside; the three-phase inverter 14 includes six power switch units, the power switches may be transistor, IGBT, MOS transistor, and other device types, two power switch units form one phase bridge arm, and form a three-phase bridge arm, a connection point of two power switch units in each phase bridge arm is connected to one phase coil in the three-phase ac motor 15, the three-phase ac motor 15 includes three-phase coils, the three-phase coils are connected to a middle point, and the three-phase ac motor 15 may be a permanent magnet synchronous motor or an asynchronous motor.

Specifically, as an embodiment of the present application, as shown in fig. 2 (for facilitating understanding of the circuit operation principle, a portion of the control module 17 is omitted in fig. 2), the three-phase inverter 14 includes a first power switch unit, a second power switch unit, a third power switch unit, a fourth power switch unit, a fifth power switch, and a sixth power switch. The control end of each power switch unit is connected to the control module 17 (not shown in the figure), the first ends of the first power switch unit, the third power switch unit and the fifth power switch unit are connected in common, the second ends of the second power switch unit, the fourth power switch unit and the sixth power switch unit are connected in common, the first-phase coil of the three-phase ac motor 15 is connected to the second end of the first power switch unit and the first end of the second power switch unit, the second-phase coil of the three-phase ac motor 15 is connected to the second end of the third power switch unit and the first end of the fourth power switch unit, and the third-phase coil of the three-phase ac motor 15 is connected to the second end of the fifth power switch unit and the first end of the sixth power switch unit.

Further, in the three-phase inverter 14, the first power switch unit and the second power switch unit form a first phase arm (a phase arm), the third power switch unit and the fourth power switch unit form a second phase arm (B phase arm), and the input end of the fifth power switch unit and the sixth power switch unit form a third phase arm (C phase arm). The first power switch unit comprises a first upper bridge arm VT1 and a first upper bridge diode VD1, the second power switch unit comprises a second lower bridge arm VT2 and a second lower bridge diode VD2, the third power switch unit comprises a third upper bridge arm VT3 and a third upper bridge diode VD3, the fourth power switch unit comprises a fourth lower bridge arm VT4 and a fourth lower bridge diode VD4, the fifth power switch unit comprises a fifth upper bridge arm VT5 and a fifth upper bridge diode VD5, the sixth power switch unit comprises a sixth lower bridge arm VT6 and a sixth lower bridge diode VD6, the three-phase alternating current motor 15 can be a permanent magnet synchronous motor or an asynchronous motor, and three-phase coils of the motor are respectively connected with the upper bridge arm and the lower bridge arm of the A, B, C in the three-phase inverter.

Further, as an embodiment of the present application, as shown in fig. 2, the first switch module 11 includes a switch element K7, a first terminal of the switch element K7 is an input terminal of the first switch module 11, and a second terminal of the switch element K7 is an output terminal of the first switch module 11.

Further, as an embodiment of the present application, as shown in fig. 2, the second switch module 12 includes a switch element K1, a first terminal of the switch element K1 is an input terminal of the second switch module 12, and a second terminal of the switch element K1 is an output terminal of the second switch module 12.

Further, as an embodiment of the present application, as shown in fig. 2, the third switch module 16 includes switch elements K2 and K3. The first end of the switching element K3 is connected with the first end of the first power unit, the first end of the third power unit and the first end of the fifth power unit in common, and the second end of the switching element K3 is connected with the positive electrode of the power battery 20; the first end of the switching element K2 is commonly connected with the second end of the second power switch unit, the second end of the fourth power switch unit and the second end of the sixth power switch unit, and the second end of the switching element K2 is connected with the negative electrode of the power battery 20.

Further, as an embodiment of the present application, as shown in fig. 2, an input end of the inductive energy storage module 13 is connected to a positive electrode of the power supply device 10 and an input end of the first switch module 11, and a first output end, a second output end, and a third output end of the inductive energy storage module 13 are respectively connected to a three-phase arm of the three-phase inverter 14.

Further, as an embodiment of the present application, as shown in fig. 2, the inductive energy storage module 13 includes an inductor L, a fourth switching element K4, a fifth switching element K5, and a sixth switching element K6. The first end of the inductor L is the input end of the inductor energy storage module 13, the second end of the inductor L is connected to the first end of the fourth switching element K4, the first end of the fifth switching element K5 and the first end of the sixth switching element K6, the second end of the fourth switching element K4 is the first output end of the inductor energy storage module 13, the second end of the fifth switching element K5 is the second output end of the inductor energy storage module 13, and the second end of the sixth switching element K6 is the third output end of the inductor energy storage module 13.

As another embodiment of the present application, as shown in fig. 3, the inductive energy storage module 13 includes an inductor L, a fourth switching element K4, a fifth switching element K5, and a sixth switching element K6, a first end of the inductor L is connected to the input end of the first switching module 11 and the positive electrode of the power supply device 10, a second end of the inductor L is connected to the first end of the fourth switching element K4, a second end of the fourth switching element K4 is connected to the first phase arm of the three-phase inverter 14 and the first end of the fifth switching element K5, a second end of the fifth switching element K5 is connected to the second phase arm of the three-phase inverter 14, and a first end and a second end of the sixth switching element K6 are connected to the second phase arm and the third phase arm of the three-phase inverter 14, respectively.

As another embodiment of the present application, as shown in fig. 4, the inductive energy storage module 13 includes an inductor L, a fourth switching element K4, a fifth switching element K5, and a sixth switching element K6, a first end of the inductor L is connected to the input end of the first switching module 11 and the positive electrode of the power supply device 10, a second end of the inductor L is connected to the first end of the fourth switching element K4, a second end of the fourth switching element K4 is connected to the first phase arm of the three-phase inverter 14 and the first end of the fifth switching element K5, a second end of the fifth switching element K5 is connected to the second phase arm of the three-phase inverter 14, and a first end and a second end of the sixth switching element K6 are connected to the first phase arm and the third phase arm of the three-phase inverter 14, respectively.

As another embodiment of the present application, as shown in fig. 5, the inductive energy storage module 13 includes an inductor L, a fourth switching element K4, and a fifth switching element K5, a first end of the inductor L is connected to the input terminal of the first switching module 11 and the positive electrode of the power supply device 10, a second end of the inductor L is connected to a first end of the fourth switching element K4, a second end of the fourth switching element K4 is connected to the first phase arm of the three-phase inverter 14 and the first end of the fifth switching element K5, and a second end of the fifth switching element K5 is connected to the second phase arm of the three-phase inverter 14.

As another embodiment of the present application, as shown in fig. 6, the inductive energy storage module 13 includes an inductor L, a fourth switching element K4, and a fifth switching element K5, a first end of the inductor L is connected to the input terminal of the first switching module 11 and the positive electrode of the power supply device 10, a second end of the inductor L is connected to a first end of the fourth switching element K4, a second end of the fourth switching element K4 is connected to the first phase arm of the three-phase inverter 14 and the first end of the fifth switching element K5, and a second end of the fifth switching element K5 is connected to the third phase arm of the three-phase inverter 14.

Further, the control module 17 is configured to control the switches of the first switch module 11, the second switch module 12, the third switch module 16, the inductive energy storage module 13, and 6 power switches of the three-phase inverter 14, and collect three-phase currents of the three-phase ac motor 15, collect bus voltages, collect power battery voltages, battery currents, battery temperatures, inductance temperatures, motor winding temperatures, and power supply device voltages.

The first boosting charging process of the motor control circuit provided in the embodiment of the present application is specifically described below by taking the circuit structure shown in fig. 2 as an example, and is detailed as follows:

when detecting that the dc voltage output from the charging pile 10 (power supply apparatus) is lower than the voltage of the power battery 20 and the power battery 20 needs to be charged, the control module 17 controls the switches K1, K2, K3, K4, K5, and K6 to be closed and at the same time controls the switch K7 to be opened. When detecting that the charging pile has correct voltage, the control module 17 controls the lower bridge arm power switches VT2, VT4, and VT6 of the three-phase inverter 14 to be turned on at the same time, so that current flows out from the positive electrode of the charging pile 10, passes through the inductor L and the three lower bridge arm power tubes of the three-phase bridge arm, and finally flows back to the negative electrode of the charging pile 10, and the direct-current charging pile 10 stores energy in the inductor L, as shown in fig. 7; then, the control module 17 controls the lower bridge arm power switches VT2, VT4, and VT6 of the three-phase inverter 14 to turn off at the same time, so that the voltage of the charging pile and the voltage of the inductor L are connected in series and are greater than the voltage of the power battery 20, and the current in the inductor L flows into the power battery 20 through the diodes VD1, VD3, and VD5 of the upper bridge arm power switches VT1, VT3, and VT5 of the three-phase inverter 14, thereby realizing that the charging pile boosts the voltage to charge the power battery 20, as shown in fig. 8.

In this embodiment, the motor control circuit provided by the application realizes the power battery boost charging function of the vehicle by using the original three-phase inverter and the corresponding switch module and the inductance energy storage module of the equipment in the motor control circuit, so that the boost charging can be performed on the power battery without independently setting up a boost circuit, and the circuit has the advantages of simple structure, low cost and high reliability.

Further, the application also provides a power battery charging method, which is implemented based on the circuits shown in fig. 2, fig. 7 and fig. 8. In particular, as shown in figure 9,

step S91: when the power supply voltage output by the power supply equipment is not higher than the voltage of the power battery and the power battery needs to be charged, the first switch module is controlled to be switched off, and the second switch module and the third switch module are controlled to be switched on.

Step S92: and controlling the three-phase inverter and the inductive energy storage module, so that the energy storage process of the inductive energy storage module and the discharging process of the power battery by the power supply equipment and the inductive energy storage module are alternately performed, and the power battery is charged after the power supply voltage of the power supply equipment is boosted.

It should be noted that, since the power battery charging method shown in this embodiment is implemented based on the circuits shown in fig. 2, fig. 7, and fig. 8, for a specific implementation process of the power battery charging method, reference may be made to the description of fig. 2, fig. 7, and fig. 8, and details are not repeated here.

Further, as another embodiment of the present application, as shown in fig. 10, the motor control circuit further includes a first capacitor module 18, a first end of the first capacitor module 18 is connected to the positive electrode of the power supply device 10, the input end of the first switch module 11, and the inductive energy storage module 13, and a second end of the first capacitor module 18 is connected to the output end of the second switch module 12, the three-phase inverter 14, and the third switch module 16.

The control module 17 is configured to, when the power supply voltage output by the power supply device 10 is not higher than the voltage of the power battery 20 and the power battery 20 needs to be charged, control the first switch module 11 to be turned off, the second switch module 12 and the third switch module 16 to be turned on, and control the three-phase inverter 14 and the inductive energy storage module 13 to enable the power battery 20 to charge the first capacitor module 18, and after the power supply device 10 detects the charging voltage of the first capacitor module 18, the control module 17 controls the three-phase inverter 14 to enable the power supply device 10 to alternately perform an energy storage process of the inductive energy storage module 13 and a discharging process of the power battery 20 by the power supply device 10 and the inductive energy storage module 13, so as to charge the power battery 20 after the power supply voltage of the power supply device 10 is boosted.

Specifically, as an embodiment of the present application, as shown in fig. 11, the first capacitor module 18 includes a capacitor C1, a first terminal of the capacitor C1 is connected to the positive electrode of the power supply apparatus 10, and a second terminal of the capacitor C1 is connected to a second terminal of the switching element K1.

The second boosting charging process of the motor control circuit provided in the embodiment of the present application is specifically described below by taking the circuit structure shown in fig. 11 as an example, and is detailed as follows:

when detecting that the dc voltage output by the charging pile is lower than the voltage of the power battery 20, the control module 17 controls the switching elements K1, K2, K3, K4, K5 and K6 to be closed, and controls the switch K7 to be opened, and controls the upper arm power switches VT1, VT3 and VT5 of the three-phase inverter 14 to be turned on, so that the current flows out from the positive electrode of the power battery 20, and charges the capacitor C1 through the upper arm power switches VT1, VT3 and VT5 of the three-phase inverter 14 and the inductor L, and controls the voltage of the capacitor C1 to be a stable value by controlling the upper arm power switches VT1, VT3, VT5, the lower arm switches VT2, VT4 and VT6 of the three-phase inverter 14 to be turned on and off alternately after the capacitor C1 is charged, so as to be detected by the charging pile. When the charging pile detects that the voltage on the capacitor C1 is within the error range of the voltage sent in the communication message, the power supply switch of the charging pile is closed, and then the control module 17 controls the lower bridge arm power switches VT2, VT4 and VT6 of the three-phase inverter 14 to be switched on at the same time, so that the current flows from the positive pole of the charging pile, passes through the inductor L and the three lower bridge arm power tubes of the three-phase bridge arm, and finally flows back to the negative pole of the charging pile, and the direct-current charging pile stores the energy of the inductor L; then, the control module 17 controls the lower bridge arm power switches VT2, VT4, and VT6 of the three-phase inverter 14 to turn off at the same time, so that the voltage of the charging pile and the voltage of the inductor L are connected in series and are greater than the voltage of the power battery 20, and the current in the inductor L flows into the power battery 20 through the diodes VD1, VD3, and VD5 of the upper bridge arm power switches VT1, VT3, and VT5 of the three-phase inverter 14, thereby realizing that the charging pile boosts the voltage to charge the power battery 20.

In the embodiment, the motor control circuit provided by the application realizes the boosting and charging functions of the power battery of the vehicle by using the original three-phase inverter and through the corresponding switch module and the inductance energy storage module of the equipment in the motor control circuit, so that the boosting and charging can be carried out on the power battery without independently setting a boosting circuit, and the circuit has the advantages of simple structure, low cost and high reliability; in addition, the first capacitor module is pre-charged before the boost charging, so that the power supply module 10 can know the voltage which needs to be acquired by the power battery 20, and the boost charging of the power supply module 10 to the power battery 20 can be performed while the charging safety can be effectively ensured.

For the above two boost charging methods of the motor control circuit, no matter which boost charging method is, the control module 17 is required to control the on/off of the power switches in the three-phase inverter 14, specifically, the control module 17 mainly controls the on/off of the power switches of the three-phase inverter 14 through the PWM wave, and the power switch control manner of the three-phase inverter 14 may be any one or a combination of the following manners: if any three-phase bridge arm, any two bridge arms or three bridge arms of A, B, C can be controlled together in a total of 7 combined modes, the method is flexible and simple, and the charging power can be effectively controlled by switching the number of the bridge arms and the duty ratio of the conduction of the bridge arms.

For example, for low-power charging, any phase of bridge arm power switch can be selected for control, and three-phase bridge arms can be switched in turn or boosted by using motor winding inductance, so that the three-phase inverter and the three-phase coil wheel are electrified and heated, and three-phase heating is more balanced; for medium-power charging, any two-phase bridge arm power switch can be selected for control, and three-phase bridge arms can be switched in turn, so that the heating of a three-phase inverter and a three-phase coil is more balanced; for high-power charging, three-phase bridge arm power switches can be selected to be controlled simultaneously, and the three-phase loop is theoretically balanced, so that the three-phase torque of the motor is zero, the three-phase synthetic magnetomotive force in the motor is basically zero, the stator magnetic field is basically zero, no torque is generated by the motor, and the stress of a transmission system is greatly reduced.

In addition, because the three-phase alternating current motor and the three-phase loop of the motor controller are not always identical in the actual circuit, the motor phase currents are not always equal when the motor inductance is used for open-loop control, and the current difference may become larger and larger after a long time, so that the independent closed-loop control of the motor phase currents is needed, and the average value of the motor currents is controlled to the preset precision range of the equilibrium value. Or when the motor current is independently controlled in a closed loop, one phase of current is controlled to be slightly larger than the other two phases of current, the other two phases of current can be controlled to be two phases of current with the same average value or slightly unequal current, so that the three-phase current can generate a small magnetic field which is not zero, the motor torque is also not zero at the moment, but the motor torque is small, so that a motor rotating shaft can output a small torque on a vehicle, the gear clearance is meshed, and the jitter and the noise caused by the torque fluctuation are reduced.

It should be noted that when the power switches in the three-phase arms of the three-phase inverter 14 are controlled to be turned on, the control module 17 should control the switches K4, K5, or K6 of the corresponding arm to be closed; in addition, in the process of boosting and charging the power battery 20 by the power supply equipment 10, the switches K4, K5 and K6 are controlled to be closed at the same time, so that the three-phase coil of the three-phase alternating current motor 15 is directly short-circuited through the switches K4, K5 and K6, and the characteristic that no current and no torque output exist in the motor winding in the whole charging process is further realized.

For example, at least one of the switch elements K4, K5 and K6 is controlled to be turned on, the bridge arm corresponding to the switch K4, K5 and K6 conducting phase is controlled, if the charging is carried out at high power, the switch elements K4, K5 and K6 are controlled to be simultaneously closed, the three bridge arms A, B, C are controlled together, if the charging is carried out at low power or medium power, any one or two of the switches K4, K5 and K6 are controlled to be turned on, and the bridge arm corresponding to the switch K4, K5 and K6 conducting phase is controlled, the control of the charging power can directly give the conducting duty ratio of the bridge arm under three phases through open-loop control or current closed-loop control or voltage-current double closed-loop control, the system response is faster or voltage-current double closed-loop external voltage feedforward control is added, and the system response is more accurate.

In addition, when controlling the switching of the three-phase inverter 14, the control module 17 may synchronously control the power switches of any two-phase or three-phase bridge arms, or perform a phase-staggered control mode, that is, when selecting any two-phase bridge arm to perform boost charging, the switching of the inverter may be performed in a phase-staggered control mode, for example, two phases are staggered by about 180 degrees in phase control, so that the positive and negative ripples of the two-phase coils are mutually superposed and mutually offset, thereby greatly reducing the total ripple; when a three-phase bridge arm is selected for boosting and charging, a phase control mode of switching the inverter in a staggered mode can be performed, for example, the three phases are staggered by about 60 degrees, so that positive and negative ripples of the three-phase coil are mutually superposed and mutually offset, and the total ripples are greatly reduced.

Further, the present application also proposes another power battery charging method, which is implemented based on the circuit shown in fig. 11. Specifically, the power battery charging method comprises the following steps:

step S121: when the power supply voltage output by the power supply equipment is not higher than the voltage of the power battery and the power battery needs to be charged, controlling the first switch module to be switched off, and controlling the second switch module and the third switch module to be switched on;

step S122: the control module controls the three-phase inverter and the inductance energy storage module to charge the power battery to the first capacitor module, and after the power supply device detects the charging voltage of the first capacitor module, the control module controls the three-phase inverter to enable the power supply device to alternately perform the energy storage process of the inductance energy storage module and the discharging process of the power battery by the power supply device and the inductance energy storage module, so that the power battery is charged after the power supply voltage of the power supply device is boosted.

It should be noted that, since the power battery charging method provided in this embodiment is implemented based on the circuit shown in fig. 11, reference may be made to the related description of fig. 11 for a specific implementation process of the power battery charging method, and details are not repeated here.

Further, as another embodiment, the motor control circuit provided by the present application may also perform direct charging, and when performing dc charging, the control module 17 is configured to control the first switching module 11, the second switching module 12, and the third switching module 16 to be turned on and the inductive energy storage module 13 to be turned off from the three-phase inverter 14 when the supply voltage output by the power supply device 10 is higher than the voltage of the power battery 20, so that the supply voltage output by the power supply device 10 charges the power battery 20.

The following describes specifically a direct charging process of the motor control circuit provided in the embodiment of the present application by taking the circuit structure shown in fig. 13 as an example, and details are as follows:

when detecting that the direct-current voltage of the charging pile 10 is matched with the voltage of the power battery 20, the control module 17 controls the switches K1, K2, K3 and K7 to be closed, and controls the switches K4, K5 and K6 to be opened, at this time, the direct current in the charging pile 10 directly charges the power battery 20, so that the power supply equipment directly charges the power battery.

In this embodiment, when the supply voltage output by the external charger is matched with the voltage of the power battery, the motor control circuit provided in the embodiment of the present application controls the on and off of the corresponding switch through the control module, so that the external charger directly charges the power battery, and the external charger does not pass through the power tube and the inductor of the three-phase inverter during charging, so that the loss is small, and the efficiency is high.

Further, as another embodiment of the present application, the motor control circuit provided in the embodiment of the present application may operate in a motor driving mode in addition to the boost charging mode and the direct charging mode, when the motor control circuit operates in the motor driving mode, the control module 17 controls the switches K1, K7, K4, K5 and K6 to be turned off, the switches K2 and K3 to be turned on, and the control module 17 controls the three-phase inverter 14 to operate in the motor driving mode, and since the motor control circuit provided in the embodiment of the present application operates in the motor driving mode, the specific operation principle thereof is the same as that of the existing motor driving mode, and thus, the detailed description thereof is omitted here.

Further, due to the inherent characteristics of the battery, the charge and discharge capacity of the power battery 20 is greatly reduced in a low-temperature state, which may affect the use of the new energy vehicle in a cold region, and in order to enable the power battery 20 to operate normally, the temperature of the power battery 20 needs to be raised when the temperature of the power battery 20 is too low, so that the motor control circuit provided in the embodiment of the present application may also operate in a heating mode, that is, heat the power battery 20.

When the motor control circuit provided by the embodiment of the present application operates in a heating mode, the control module 17 may include a vehicle control unit, a control circuit of the motor controller, and a BMS battery manager circuit, which are connected by a CAN line, and different modules in the control module 17 control the on and off of switches in the first switch module 11, the second switch module 12, the inductance energy storage module 13, the three-phase inverter 14, and the third switch module 16 according to the acquired information to implement the on and off of different current loops, and in addition, cooling liquid pipes are provided on the power battery 20, the three-phase inverter 14, and the three-phase ac motor 15, and cooling liquid flows in the cooling liquid pipes, so that the temperature of the power battery 20 CAN be adjusted by adjusting the temperature of the cooling liquid in the cooling liquid pipes.

Specifically, the motor control circuit can obtain the temperature of the power battery 20 through the control module 17, namely, the battery manager can be used to obtain the temperature of the power battery 20, the temperature of the power battery 20 is compared with the preset temperature value to judge whether the power battery 20 is in a low temperature state, when the temperature of the power battery 20 is detected to be lower than the preset temperature value, the temperature of the power cell 20 can be increased by increasing the temperature of the coolant flowing through the power cell 20, since the inductive energy storage module 13, the three-phase inverter 14 and the three-phase ac motor 15 all generate heat during operation, therefore, at least one of the inductive energy storage module 13, the three-phase inverter 14 and the three-phase ac motor 15 may be controlled to heat the coolant flowing through the power battery 20, and the heating may be stopped until the temperature of the power battery 20 reaches the preset temperature value.

In this embodiment, the motor control circuit provided in this embodiment of the present application heats the coolant flowing through the power battery 20 by controlling at least one of the inductive energy storage module 13, the three-phase inverter 14, and the three-phase ac motor 15, and the temperature of the power battery can be raised without using an engine or adding a heating device, so that the heating efficiency is high, the temperature of the power battery is raised quickly, and the motor control circuit has heating and charging functions, thereby improving the adaptability and compatibility of the motor control circuit.

Further, as an embodiment, before controlling at least one of the inductance energy storage module 13, the three-phase inverter 14 and the three-phase ac motor 15 to heat the coolant flowing through the power battery 20, the control module 17 needs to determine whether the received information meets a preset condition, where the preset condition may include, in addition to the determination of the temperature value of the power battery 20, other determination conditions:

the control module 17 acquires gear information, vehicle speed information and temperature information of the power battery 20;

the control module 17 acquires the current working state of the motor according to the gear information and the vehicle speed information, and controls at least one of the inductance energy storage module 13, the three-phase inverter 14 and the three-phase alternating current motor 15 to heat the cooling liquid flowing through the power battery 20 when the current working state of the motor is a non-driving state and the temperature of the power battery 20 is lower than a preset temperature value, and the control module 17 controls at least one of the inductance energy storage module 13, the three-phase inverter 14 and the three-phase alternating current motor 15 to stop heating the cooling liquid flowing through the power battery 20 until the current working state is detected to be a driving state or the temperature of the power battery is not lower than the preset temperature value;

when the control module 17 determines that the temperature of the power battery is not lower than the preset temperature value, the gear information, the vehicle speed information and the temperature information of the power battery are obtained again.

During specific implementation, the control module 17 specifically performs the following steps when obtaining the current working state of the motor according to the gear information and the vehicle speed information: when the control module 17 judges that the current gear is the P gear and the vehicle speed is 0, the current working state of the motor is a non-driving state; when the control module 18 determines that the current gear is not the P gear or the vehicle speed is not zero, the current working state of the motor is a driving state; it should be noted that, in the embodiment of the present application, the two determination conditions of the operating state of the motor and the temperature of the power battery are not in sequence.

When the preset conditions are that the current gear is the P gear, the vehicle speed is 0 and the temperature of the power battery 20 does not reach the preset temperature value, that is, the temperature of the power battery 20 is detected to be low when the vehicle is in a parking state, the control module 17 controls at least one of the inductance energy storage module 13, the three-phase inverter 14 and the three-phase alternating current motor 15 to heat the cooling liquid flowing through the power battery 20, and when one of the current gear, the vehicle speed and the temperature of the power battery 20 is detected in a circulating mode in the heating process and does not meet the preset conditions, the heating is stopped, and all the switch modules are controlled to be switched off.

In the embodiment, when the detected gear information, the vehicle speed information and the temperature information of the power battery meet the preset conditions in the parking state, at least one of the inductive energy storage module 13, the three-phase inverter 14 and the three-phase alternating current motor 15 is controlled to heat the cooling liquid flowing through the power battery 20, so that the power battery is heated in the parking state of the vehicle, and the vehicle can be normally started in the low-temperature condition.

Further, as an embodiment, the three-phase inverter 14 may be controlled in the following manner: the control module 17 outputs six paths of PWM control signals to the three-phase inverter 14, so that the three-phase inverter 14 performs corresponding switching state switching according to the six paths of PWM control signals, obtains the output power of the power battery 20 or the power supply device 10, compares the output power with the preset heating power, and adjusts the duty ratio of the PWM control signals according to the comparison result to adjust the output power to the preset heating power.

The control module 17 receives the voltage and current data output by the power battery 20 or the power supply device 10, calculates the output power of the power battery 20, regards the output power as the battery heating power, compares the calculated heating power with the preset heating power, increases the PWM duty ratio and increases the output current of the power battery 20 if the calculated heating power is lower, and decreases the PWM duty ratio and decreases the output current of the power battery 20 if the calculated heating power is higher until the heating power reaches the vicinity of the heating instruction power.

In the present embodiment, the output power of the power battery 20 or the power supply apparatus 10 is obtained and compared with the preset heating power, and then the duty ratio of the PWM control signal for controlling the three-phase inverter 14 is adjusted according to the comparison result, so that the heating power is controllable in a closed loop.

Further, as an implementation manner of the present application, when the motor control circuit provided by the embodiment of the present application operates in a heating mode, the power battery may be heated by heat generated by the inductor L, and in this heating mode, the control module 17 is configured to, when detecting that the temperature of the power battery 20 is lower than the preset temperature value, control the first switching module 11 to be turned on with the second switching module 12, and control the third switching module 16 to be turned off, and by controlling the three-phase inverter 14 and the inductive energy storage module 13, the power supply apparatus 10 alternates the energy storage process of the inductive energy storage module 13 and the discharge process of the inductive energy storage module 13, so that the inductive energy storage module 13 and the three-phase inverter 14 generate heat during the discharge process, heat a heat exchange medium flowing through at least one of the inductive energy storage module 13 and the three-phase inverter 14 is heated, and then flows through the power battery 20, so that the temperature of the power battery 20 is raised, thereby achieving heating of the power battery 20.

In this embodiment, by controlling the turn-off and turn-on states of the switches in the first switch module, the second switch module, the inductance energy storage module, the three-phase inverter and the third switch module, the energy storage process of the inductance energy storage module and the discharge process of the inductance energy storage module are performed alternately by the power supply device, so that the inductance energy storage module generates heat in the discharge process to heat the coolant flowing through the power battery, and the temperature of the power battery can be raised without using an engine or adding a heating device.

The following describes a first way of inductively generating heat to heat a power battery of a motor control circuit provided in an embodiment of the present application, by taking the circuit structures shown in fig. 14 and 15 as examples, and details are as follows:

when the charging pile 10 provides electric energy for heating, the control module 17 controls the switches K1, K4, K5, K6 and K7 to be closed, the control switches K2 and K3 to be disconnected, and the lower bridge arm power switches VT2, VT4 and VT6 of the three-phase inverter 14 are controlled to be switched on, so that current flows out from the positive electrode of the charging pile 10, passes through the inductor L and the three lower bridge arm power tubes of the three-phase bridge arm, and finally flows back to the negative electrode of the charging pile 10, and the direct-current charging pile 10 stores energy in the inductor L, as shown in fig. 14; then, the control module 17 controls the lower bridge arm power switches VT2, VT4, and VT6 of the three-phase inverter 14 to turn off at the same time, so as to release the stored energy in the inductor L and heat the power battery 20, and the specific current path diagram can refer to fig. 15.

Further, the present application proposes a power battery heating method, which is implemented based on the circuits shown in fig. 14 and fig. 15. Specifically, as shown in fig. 16, the power battery heating method includes:

step S161: and when the temperature of the power battery is detected to be lower than a preset temperature value, controlling the first switch module to be connected with the second switch module and controlling the third switch module to be disconnected.

Step S162: and controlling the three-phase inverter and the inductive energy storage module, so that the energy storage process of the inductive energy storage module and the discharge process of the inductive energy storage module are alternately performed by the power supply equipment, so that the inductive energy storage module and the three-phase inverter generate heat in the discharge process, heat is applied to a heat exchange medium flowing through at least one of the inductive energy storage module and the three-phase inverter, and the temperature of the power battery to be heated is increased when the heated heat exchange medium flows through the power battery again.

It should be noted that, since the power battery heating method provided in this embodiment is implemented based on the circuits shown in fig. 14 and fig. 15, the specific implementation process of the power battery heating method may refer to the description of fig. 14 and fig. 15, and is not described herein again.

Further, as another embodiment of the present application, when the motor control circuit provided in this embodiment of the present application is operated in a heating mode, another heating mode in which the power battery is heated by heat generated by the inductor L may be implemented, and in this heating mode, the control module 17 is configured to, when it is detected that the temperature of the power battery 20 is lower than a preset temperature value, control the first switching module 11 to be turned on with the third switching module 16, and control the second switching module 12 to be turned off, and by controlling the three-phase inverter 14 and the inductive energy storage module 13, the power battery 20 alternates an energy storage process of the inductive energy storage module 13 and a discharge process of the inductive energy storage module 13, so that the inductive energy storage module 13 and the three-phase inverter 14 generate heat during the discharge process, heat the heat exchange medium flowing through at least one of the inductive energy storage module 13 and the three-phase inverter 14 is heated, when the heated heat exchange medium flows through the power battery, the temperature of the power battery 20 is raised, so that the power battery is heated.

In this embodiment, by controlling the turn-off and turn-on states of the switches in the first switch module, the second switch module, the inductive energy storage module, the three-phase inverter and the third switch module, the energy storage process of the inductive energy storage module and the discharge process of the inductive energy storage module are performed alternately by the power battery, so that the inductive energy storage module and the three-phase inverter 14 generate heat in the discharge process to heat the coolant flowing through the power battery, and the temperature of the power battery can be raised without using an engine or adding a heating device.

The following describes a second way of inductively generating heat to heat a power battery in a motor control circuit provided in an embodiment of the present application, by taking the circuit structures shown in fig. 17 and 18 as examples, which is detailed as follows:

when the power battery 20 provides electric energy for heating, the control module 17 controls the switches K2, K3, K4, K5, K6 and K7 to be closed, controls the switch K1 to be opened, and controls the lower bridge arm power switches VT2, VT4 and VT6 of the three-phase inverter 14 to be turned on, so that current flows out from the positive electrode of the power battery 20, passes through the switching element K7, the inductor L and the three lower bridge arm power tubes of the three-phase bridge arm, and finally flows back to the negative electrode of the power battery 20, so that the power battery 20 stores energy in the inductor L, as shown in fig. 17; then, the control module 17 controls the lower bridge arm power switches VT2, VT4, and VT6 of the three-phase inverter 14 to turn off at the same time, so as to release the stored energy in the inductor L to generate heat, and heat the power battery 20 through the inductor L and the heat generated by the three-phase inverter 14, and a specific current path diagram can refer to fig. 18.

For the above two ways of generating heat by the inductor to heat the power battery, the control mode of the three-phase controller 14 is that the control module 17 controls the on-off of the lower arm three-phase power switches VT2, VT4, and VT6 of the three-phase inverter 14 through the PWM wave, and the heating power is realized by controlling the on-duty ratios of the power switches VT2, VT4, and VT6, and the larger the on-duty ratio is, the larger the current is, the larger the heating power is.

In addition, fig. 14, fig. 15, fig. 17 and fig. 18 illustrate a specific process of the two inductance heat-generating and heating power batteries by taking the switching elements K4, K5 and K6 as an example, but in other embodiments, the switching elements K4, K5 and K6 may be closed at any one time or at any two times, and are not particularly limited herein, and it is noted that, in the two inductance heat-generating and heating power batteries, if only one of the switching elements K4, K5 and K6 is closed, the switching of the lower arm power switch of one phase in the three-phase inverter 14 connected to the switching element is correspondingly controlled, and if any two of the switching elements K4, K5 and K6 are closed, the switching of the lower arm power switch of two phases in the three-phase inverter 14 connected to the two switching elements is correspondingly controlled.

In addition, the switches K4, K5 and K6 are controlled to be closed simultaneously, so that a three-phase coil of the three-phase alternating current motor 15 is directly short-circuited through the switches K4, K5 and K6, and further, in the process of heating the power battery by heat generated by the two types of inductors, the three-phase alternating current motor 15 has no current and no torque output, and the three phases are uniformly heated while high-power heating is realized.

Further, the application provides a power battery heating method, which is implemented based on the circuits shown in fig. 17 and fig. 18. Specifically, as shown in fig. 19, the power battery heating method includes:

step S191: and when the temperature of the power battery is detected to be lower than a preset temperature value, controlling the first switch module and the third switch module to be connected, and controlling the second switch module to be disconnected.

Step S192: and controlling the three-phase inverter and the inductive energy storage module to alternately perform an energy storage process of the inductive energy storage module and a discharge process of the inductive energy storage module by the power battery, so that the inductive energy storage module and the three-phase inverter generate heat in the discharge process to heat a heat exchange medium flowing through at least one of the inductive energy storage module and the three-phase inverter, and when the heated heat exchange medium flows through the power battery again, the temperature of the power battery is increased.

It should be noted that, in this embodiment, since the power battery heating method is implemented based on the circuits shown in fig. 17 and fig. 18, the specific implementation process of the power battery heating method may refer to the description related to fig. 17 and fig. 18, and is not described herein again.

Further, as another implementation manner of the present application, when the motor control circuit provided in the embodiment of the present application operates in a heating mode, the three-phase ac motor may be controlled by the power supply device to generate heat to heat the power battery, and in this heating mode, as shown in fig. 20, the motor control circuit further includes a second capacitor module 19, and the second capacitor module 19 is connected to the three-phase inverter 14, the third switch module 16, the second switch module 12, and the positive and negative electrodes of the power battery 20.

Specifically, in this heating mode, the control module 17 is configured to, when detecting that the temperature of the power battery 20 is lower than the preset temperature value, control the second switch module to be turned on, disconnect the first switch module 11 from the third switch module 16, and control the three-phase inverter 14 and the inductive energy storage module 13, so that the energy storage process of the power supply apparatus 10 on the three-phase coils of the inductive energy storage module 13 and the three-phase ac motor 15, the forward charging process of the inductive energy storage module 13 and the three-phase coils of the three-phase ac motor 15 on the second capacitance module 19, the energy storage process of the second capacitance module discharging 19 on the three-phase coils of the three-phase ac motor 15, and the charging process of the three-phase coils of the three-phase ac motor 15 on the second capacitance module 19 are sequentially and alternately performed, so that the electric energy provided by the power supply apparatus 10 is generated during the operation of the inductive energy storage module 13, the three-phase inverter 14, and the three-phase ac motor 15, and heats the heat transfer medium flowing through at least one of the inductive energy storage module 13, the three-phase inverter 14 and the three-phase ac motor 15, and when the heated heat transfer medium flows through the power battery 20 again, the temperature of the power battery 20 is raised, so as to heat the power battery 20.

The following describes a specific process of the first way of the motor control circuit provided in the embodiment of the present application, which controls the three-phase ac motor to generate heat to heat the power battery through the power supply device, by taking the circuit structures shown in fig. 21 to 24 as examples, and details are as follows:

the control module 17 controls the switches K1 and K4 to close and simultaneously controls the switches K2, K3, K5, K6, and K7 to open. The control module 17 controls the lower bridge arm power switches VT4 and VT6 of the three-phase inverter 14 to be turned on, so that current flows out from the positive electrode of the charging pile 10 to charge and store energy in the inductor L and the motor inductor, and flows back to the negative electrode of the charging pile 10 through the lower bridge arm power switches VT4 and VT6, and the current path is as shown in fig. 21; when the current value reaches a certain current threshold IG, the control module 17 controls the lower bridge arm power switches VT4 and VT6 of the three-phase inverter 14 to be turned off, the inductor L and the motor inductor discharge to charge the bus capacitor C in the forward direction, the current flows out from the positive electrode of the charging pile 10, flows into the power battery 20 through the inductor L, the motor winding, the diode VD3 of the upper bridge arm power switch VT3 of the three-phase inverter 14 and the diode VD5 of the switch VT5, and then flows back to the charging pile 10 from the negative electrode of the power battery 20, and the current path is as shown in fig. 22; when the current freewheeling in the inductor is detected to be finished, the control module 17 controls the upper bridge arm switches VT3 and VT5 and the lower bridge arm power switch VT2 of the three-phase inverter 14 to be turned on, the bus capacitor C discharges to charge and store energy for the inductor of the motor, and the current path is as shown in fig. 23; when detecting that the bus voltage in the inductor drops to a certain voltage threshold UG (UG >0), the control module 17 controls the power switches VT2, VT3, VT5 of the three-phase inverter 14 to turn off, the motor inductor stored energy is released to charge the bus capacitor C, the current path is as shown in fig. 24, and the above four processes are performed in sequence and in a cycle, so that the current circularly flows in the motor and the inductor L to generate heat, so as to heat the power battery 20; in the heating process of the power battery, the heating power can be controlled by controlling the cycle frequency f of the cycle and the magnitude of the charging current IG, and even the cycle of the cycle can be controlled to be close to the resonance frequency point fc of the motor inductance and the bus capacitance, wherein UG is used for protecting the bus from reverse charging of the bus, and UG is greater than 0 and has a certain margin.

It should be noted that fig. 21 to 24 only illustrate the specific process of heating the power battery by taking the closing of the switch element K4 as an example, and in other embodiments, the switch elements K4, K5 and K6 may be closed at the same time, or may be closed at any two times, and the battery heating control process when the switch elements K4, K5 and K6 may be closed at the same time, or the switch elements K4, K5 and K6 are closed at any two times may be described with reference to fig. 21 to 24, which is not limited herein.

In this embodiment, the motor control circuit provided by the present application controls the turn-off and turn-on states of each switch in the first switch module, the second switch module, the third switch module, the inductance energy storage module and the three-phase inverter, so that the energy storage process of the power supply device on the inductance energy storage module and the three-phase coil of the three-phase ac motor, the forward charging process of the inductance energy storage module and the three-phase coil of the three-phase ac motor on the second capacitor module, the energy storage process of the second capacitor module discharging on the three-phase coil of the three-phase ac motor and the charging process of the three-phase coil of the three-phase ac motor on the second capacitor module are performed alternately in sequence, so that the electric energy provided by the power supply device generates heat during the working processes of the inductance energy storage module and the three-phase ac motor, heats the coolant flowing through the power battery, and can achieve the purpose of increasing the temperature of the power battery without using an engine or adding a heating device, the heating efficiency is high, the temperature of the power battery rises quickly, and the heating mode is diversified.

Further, the present application provides a power battery heating method, which is implemented based on the circuits shown in fig. 20 to fig. 24. Specifically, as shown in fig. 25, the power battery heating method includes:

step S251: and when the temperature of the power battery is detected to be lower than a preset temperature value, controlling the second switch module to be switched on, and controlling the first switch module and the third switch module to be switched off.

Step S252: controlling the three-phase inverter and the inductive energy storage module to enable the energy storage process of the inductive energy storage module and a three-phase coil of the three-phase alternating current motor by the power supply equipment, the forward charging process of the inductive energy storage module and the three-phase coil of the three-phase alternating current motor on the second capacitor module, the energy storage process of the discharge of the second capacitor module on the three-phase coil of the three-phase alternating current motor and the charging process of the three-phase coil of the three-phase alternating current motor on the second capacitor module to be sequentially and alternately carried out, so that electric energy provided by the power supply equipment generates heat in the working process of the inductive energy storage module, the three-phase inverter and the three-phase alternating current motor, heats a heat exchange medium flowing through at least one of the inductive energy storage module, the three-phase inverter and the three-phase alternating current motor, and when the heated heat exchange medium flows through the power battery again, and raising the temperature of the power battery.

It should be noted that, since the power battery heating method provided in this embodiment is implemented based on the circuits shown in fig. 20 to 24, the specific implementation process of the power battery heating method may refer to the description related to fig. 20 to 24, and is not described herein again.

Further, as another embodiment of the present application, when the motor control circuit provided in this embodiment of the present application is operated in a heating mode, the power battery may be heated in another manner that the power supply device controls the three-phase ac motor to generate heat, and in this heating mode, the control module 17 is configured to, when detecting that the temperature of the power battery is lower than a preset temperature value, control the first switching module 11 to be turned on with the second switching module 12, control the third switching module 16 to be turned off, and by controlling the three-phase inverter 14 and the inductive energy storage module 13, enable an energy storage process of the power supply device 10 on the three-phase coils of the inductive energy storage module 13 and the three-phase ac motor 15 and a discharge process of the inductive energy storage module 13 and the three-phase coils of the three-phase ac motor 15 to be alternately performed, so that the inductive energy storage module 13, the three-phase inverter 14, and the three-phase ac motor 15 generate heat during a discharge process, the heat exchange medium flowing through at least one of the inductance energy storage module 13, the three-phase inverter 14 and the three-phase ac motor 15 is heated, and when the heated heat exchange medium flows through the power battery 20 again, the temperature of the power battery 20 is raised, so that the power battery 20 is heated.

The following describes a specific process of the second way of controlling the three-phase ac motor to generate heat to heat the power battery by the motor control circuit power supply apparatus provided in the embodiment of the present application, by taking the circuit structures shown in fig. 26 and fig. 27 as examples, and details are as follows:

the control module 17 controls the switches K1, K4 and K7 to close and at the same time controls K2, K3, K5 and K6 to open. The control module 17 controls the lower bridge arm power switches VT4 and VT6 of the three-phase inverter 14 to be turned on, so that current flows out from the positive pole of the charging pile 10 to charge and store energy for the inductor L and the motor inductor, and flows back to the negative pole of the charging pile 10 through the lower bridge arm power switches VT4 and VT6, and the current path is as shown in fig. 26; when the current value reaches a certain current threshold IG, the control module 17 controls the power switches VT4 and VT6 of the three-phase inverter 14 to be turned off, the inductor L and the motor inductor are discharged, the current flows back to the inductor from the inductor L, the motor winding and the diodes VD3 and VD5 of the upper bridge arm power switches VT3 and VT5 of the three-phase inverter 14, the current path is as shown in fig. 27, and the two processes are performed in sequence and in a cycle, so that the current flows in the inductor and the motor to generate heat to heat the power battery 20; in the above power battery heating process, the heating power can be controlled by controlling the IG to be smaller than the current value allowed in the circuit, or the control of the inductance and the current in the motor can be realized by controlling the on duty ratios of the power switches VT4 and VT6, so as to control the heating power.

It should be noted that fig. 26 and 27 only illustrate the specific process of heating the power battery by taking the closing of the switch element K4 as an example, but in other embodiments, the switch elements K4, K5 and K6 may be closed at the same time, or may be closed at any two times, and the battery heating control process when the switch elements K4, K5 and K6 may be closed at the same time, or the switch elements K4, K5 and K6 are closed at any two times may be described with reference to fig. 26 and 27, which is not limited herein.

In this embodiment, the motor control circuit provided by the application controls the turn-off and turn-on states of each switch in the first switch module, the second switch module, the third switch module, the inductance energy storage module and the three-phase inverter, so that the energy storage process of the inductance energy storage module and the three-phase coil of the three-phase alternating current motor and the discharge process of the inductance energy storage module and the three-phase coil of the three-phase alternating current motor are performed alternately by the power supply device, so that the inductance energy storage module and the three-phase alternating current motor generate heat in the discharge process to heat the cooling liquid flowing through the power battery, the temperature of the power battery can be increased without using an engine or adding a heating device, the heating efficiency is high, the temperature of the power battery is increased quickly, and the heating power is controllable.

Further, the present application provides a power battery heating method, which is implemented based on the circuits shown in fig. 26 and fig. 27. Specifically, as shown in fig. 28, the power battery heating method includes:

step S281: and when the temperature of the power battery is detected to be lower than a preset temperature value, controlling the first switch module to be connected with the second switch module and controlling the third switch module to be disconnected.

Step S282: and controlling the three-phase inverter and the inductance energy storage module, so that the energy storage process of the inductance energy storage module and a three-phase coil of the three-phase alternating current motor and the discharge process of the inductance energy storage module and the three-phase coil of the three-phase alternating current motor are alternately performed by the power supply equipment, so that the inductance energy storage module, the three-phase inverter and the three-phase alternating current motor generate heat in the discharge process, heat is transferred to at least one heat transfer medium in the inductance energy storage module, the three-phase inverter and the three-phase alternating current motor, and the temperature of the power battery is increased when the heated heat transfer medium flows through the power battery again.

It should be noted that, in this embodiment, since the power battery heating method is implemented based on the circuits shown in fig. 26 and fig. 27, the specific implementation process of the power battery heating method may refer to the description related to fig. 26 and fig. 27, and is not described herein again.

Further, as another implementation manner of the present application, when the motor control circuit provided in this embodiment of the present application is operated in a heating mode, the power battery may also be controlled by the power battery to heat the power battery, and in this heating mode, the control module 17 is configured to, when detecting that the temperature of the power battery is lower than a preset temperature value, control the second switching module 11 to be turned on with the third switching module 16, and control the first switching module 11 to be turned off, and by controlling the three-phase inverter 14 and the inductive energy storage module 13, enable an energy storage process of the power battery 20 to the three-phase coils of the inductive energy storage module 13 and the three-phase alternating current motor 15 and a discharge process of the inductive energy storage module 13 and the three-phase coils of the three-phase alternating current motor 15 to be performed alternately, so that the inductive energy storage module 13, the three-phase inverter 14, and the three-phase alternating current motor 15 generate heat during a discharge process, the heat exchange medium flowing through at least one of the inductance energy storage module 13, the three-phase inverter 14 and the three-phase ac motor 15 is heated, and when the heated heat exchange medium flows through the power battery 20 again, the temperature of the power battery 20 is raised, so that the power battery 20 is heated.

The following describes a specific process of the motor control circuit provided in the embodiment of the present application, which is operated in a manner that the power battery controls a three-phase ac motor to generate heat to heat the power battery, by taking the circuit structures shown in fig. 29 and fig. 30 as examples, and the following is detailed:

the control module 17 controls the switches K2, K3, K4 and K7 to be closed and at the same time controls K1, K5 and K6 to be open. The control module 17 controls the lower bridge arm power switches VT4 and VT6 of the three-phase inverter 14 to be turned on, so that current flows out from the positive electrode of the power battery 20 to charge and store energy in the inductor L and the motor inductor, and flows back to the negative electrode of the power battery 20 through the lower bridge arm power switches VT4 and VT6, and a current path is as shown in fig. 29; when the current value reaches a certain current threshold IG, the control module 17 controls the power switches VT4 and VT6 of the three-phase inverter 14 to be turned off, the inductor L and the motor inductor are discharged, the current flows back to the inductor from the inductor L, the motor winding and the diodes VD3 and VD5 of the upper bridge arm power switches VT3 and VT5 of the three-phase inverter 14, the current path is as shown in fig. 30, and the two processes are performed in sequence and in a cycle, so that the current flows in the inductor and the motor to generate heat to heat the power battery 20; in the above power battery heating process, the heating power can be controlled by controlling the IG to be smaller than the current value allowed in the circuit, or the control of the inductance and the current in the motor can be realized by controlling the on duty ratios of the power switches VT4 and VT6, so as to control the heating power.

It should be noted that fig. 29 and fig. 30 only illustrate the specific process of heating the power battery by taking the closing of the switch element K4 as an example, but in other embodiments, the switch elements K4, K5 and K6 may be closed at the same time, or may be closed at any two times, and the battery heating control process when the switch elements K4, K5 and K6 may be closed at the same time, or the switch elements K4, K5 and K6 are closed at any two times may be described with reference to fig. 29 and fig. 30, which is not limited herein.

Further, as another implementation manner of the present application, when the motor control circuit provided in this embodiment of the present application operates in a heating mode, the three-phase ac motor may also be controlled by the power battery to generate heat to heat the power battery, and in this heating mode, the control module 17 is configured to control the third switching module 16 to be turned on, the first switching module 11 is turned off from the second switching module 12, and by controlling the three-phase inverter 14 and the inductive energy storage module 13, the power battery 20 stores energy into the inductive energy storage module 13 and the three-phase coil of the three-phase ac motor 15, the inductive energy storage module 13 and the three-phase coil of the three-phase ac motor 15 charges the first capacitive module 18, the first capacitive module 18 discharges energy to the inductive energy storage module 13 and the three-phase coil of the three-phase ac motor 15, The reverse charging process of the three-phase coil of the three-phase alternating current motor 15 and the reverse charging process of the inductance energy storage module 18 by the inductance energy storage module 13 and the discharging process of the inductance energy storage module 13 by the first capacitance module 18 are sequentially and alternately performed, so that the electric energy provided by the power battery 20 generates heat in the working processes of the inductance energy storage module 13, the three-phase inverter 14 and the three-phase alternating current motor 15, and heats a heat exchange medium flowing through at least one of the inductance energy storage module 13, the three-phase inverter 14 and the three-phase alternating current motor 15, and when the heated heat exchange medium flows through the power battery 20 again, the temperature of the power battery 20 is increased, so that the power battery is heated.

The following describes a specific process of the motor control circuit provided in the embodiment of the present application, which uses the circuit structure shown in fig. 31 to fig. 35 as an example to control the three-phase ac motor to generate heat to heat the power battery, and details are as follows:

when the temperature of the power battery 20 is not too low and the charge of the power battery 20 is sufficient, i.e. the power battery allows discharging, the control module 17 controls the switches K2, K3 and K4 to close. And simultaneously controls the switches K1, K5, K6 and K7 to be turned off. The control module 17 controls the upper bridge arm power switches VT3 and VT5 of the three-phase inverter 14 to be turned on, so that current flows out from the positive electrode of the power battery 20, passes through the power switches VT3 and VT5 to charge and store energy for the inductor L and the motor inductor, and flows back to the negative electrode of the power battery 20 through the capacitor C1, and a current path is as shown in fig. 31; when the current value reaches a certain current threshold IG, the control module 17 controls the upper bridge arm power switches VT3 and VT5 of the three-phase inverter 14 to turn off, the inductor L and the motor winding inductor follow current to charge the capacitor C1, the inductor L and the motor inductor current flow into the capacitor C1, and then flow back to the inductor L and the motor inductor through the diodes VD3 and VD5 of the power switches VT3 and VT5, and the current path is as shown in fig. 32; when the current in the inductor L and the motor winding inductor is zero, the control module 17 controls the power switches VT4 and VT6 of the three-phase inverter 14 to be turned on, the capacitor C1 discharges to store energy for the inductor L and the motor winding inductor, the electric energy of the capacitor C1 flows back to the capacitor C1 through the power switches VT4 and VT6 after passing through the inductor L and the motor inductor, and the current path is as shown in fig. 33; when the voltage of the capacitor C1 is zero, the control module 17 controls the power switches VT4 and VT6 of the three-phase inverter 14 to be turned on, the inductor L and the motor winding inductor stored energy are released to charge the capacitor C1 in the reverse direction, the current in the inductor L and the motor flows into the capacitor C1 through the power switches VT4 and VT6, and flows back to the inductor and the motor through the capacitor C1, and the current path is as shown in fig. 34; when the current in the inductor L and the winding inductor of the motor is zero, the control module 17 controls the power switches VT4 and VT6 to be turned off, the capacitor C1 discharges to store energy in the inductor L, the electric energy of the capacitor C1 flows back to the capacitor C1 after passing through the diode VD2 of the power switch VT2 and the inductor L, the current path is as shown in fig. 35, and the five processes are performed in sequence in a cycle, so that the current circularly flows in the motor and the inductor L to generate heat, and the heat is heated to the power battery 20; it should be noted that, in the above-mentioned heating process of the power battery, the heating power can be controlled by controlling the cycle frequency f of the cycle and the magnitude of the charging current IG, and even the cycle of the cycle can be controlled to be close to the resonance frequency point fc of the motor inductance and the bus capacitor.

It should be noted that fig. 31 to 35 only illustrate the specific process of heating the power battery by taking the closing of the switch element K4 as an example, and in other embodiments, the switch elements K4, K5 and K6 may be closed at the same time, or may be closed at any two times, and the battery heating control process when the switch elements K4, K5 and K6 may be closed at the same time, or the switch elements K4, K5 and K6 are closed at any two times may be described with reference to fig. 31 to 35, which is not limited herein.

In this embodiment, the motor control circuit provided by the present application controls the turn-off and turn-on states of each switch in the first switch module, the second switch module, the third switch module, the inductance energy storage module and the three-phase inverter, so that the energy storage process of the power battery on the inductance energy storage module and the three-phase coil of the three-phase ac motor, the charging process of the inductance energy storage module and the three-phase coil of the three-phase ac motor on the first capacitor module, the energy storage process of the first capacitor module by discharging on the inductance energy storage module and the three-phase coil of the three-phase ac motor, the reverse charging process of the three-phase coil of the three-phase ac motor and the inductance energy storage module on the first capacitor module by discharging on the inductance energy storage module, and the discharging process of the first capacitor module by discharging on the inductance energy storage module are sequentially and alternately performed, so that the electric energy provided by the power battery generates heat in the working processes of the inductance energy storage module and the three-phase ac motor, the cooling liquid flowing through the power battery is heated, the temperature of the power battery can be increased without using an engine or adding a heating device, the heating efficiency is high, the temperature of the power battery is increased quickly, the heating power is controllable, and the heating mode is diversified.

According to the specific description of the motor control circuit in the aspects of charging and heating, the motor control circuit provided by the embodiment of the application can realize direct charging and boosting charging of the direct-current charging pile, can also realize heating of the charging pile or the power battery to the power battery, can realize multifunctional multiplexing of a three-phase bridge arm, is high in bridge arm utilization rate and good in compatibility, realizes high-power charging, greatly reduces the circuit cost, and has a great cost advantage.

Further, the present application also provides a power battery heating method, which is implemented based on the circuits shown in fig. 31 to fig. 35. Specifically, as shown in fig. 36, the power battery heating method includes:

step S361: and when the temperature of the power battery is detected to be lower than a preset temperature value, controlling the third switch module to be switched on, and controlling the first switch module and the second switch module to be switched off.

Step S362: controlling the three-phase inverter and the inductive energy storage module, so that the energy storage process of the inductive energy storage module and a three-phase coil of the three-phase alternating current motor by the power battery, the charging process of the inductive energy storage module and the three-phase coil of the three-phase alternating current motor to the first capacitor module, the energy storage process of the inductive energy storage module and the three-phase coil of the three-phase alternating current motor by the discharging of the first capacitor module, the reverse charging process of the three-phase coil of the three-phase alternating current motor and the discharging process of the inductive energy storage module by the discharging of the first capacitor module are performed alternately in sequence, so that the electric energy provided by the power battery generates heat in the working processes of the inductive energy storage module, the three-phase inverter and the three-phase alternating current motor, and flows through the inductive energy storage module, And heating the heat exchange medium of at least one of the three-phase inverter and the three-phase alternating current motor, and increasing the temperature of the power battery when the heated heat exchange medium flows through the power battery.

It should be noted that, since the power battery heating method provided in this embodiment is implemented based on the circuits shown in fig. 31 to fig. 35, the specific implementation process of the power battery heating method may refer to the description related to fig. 31 to fig. 35, and is not described herein again.

Another embodiment of this application provides a vehicle, and the vehicle still includes the motor control circuit that above-mentioned embodiment provided, and the vehicle still includes power battery, coolant liquid case, water pump and water line, and the water pump is according to control signal with coolant liquid input to water line in the coolant liquid case, and water line passes power battery and motor control circuit.

Specifically, as shown in fig. 37, the vehicle battery heating system includes: at least one three-phase alternating current motor (two are taken as examples in the figure), at least one motor controller (two are taken as examples in the figure), at least one power battery, a cooling liquid tank, a water pump, a battery manager, a vehicle control unit, an optional charger (power supply equipment) and necessary cooling liquid pipelines. The motor controller is connected with the three-phase alternating current motor, the positive and negative electrodes of the power battery are connected with the positive and negative electrodes of the motor controller, the power battery is further connected with a battery manager, the optional charger is connected with the power battery and the motor controller, and the battery manager and the motor controller are communicated with the whole vehicle controller through a CAN (controller area network) line. The battery manager is used for collecting power battery information including voltage, current and temperature, controlling on-off of a power battery switch, charging and discharging functions and the like, the motor controller is used for controlling an upper bridge power switch and a lower bridge power switch of the three-phase inverter and collecting three-phase current, and the vehicle controller is used for managing operation of a whole vehicle and other controller equipment on the vehicle. The water pump pumps the cooling liquid out of the cooling liquid tank and conveys the cooling liquid to a first three-phase alternating current motor, the output of the first three-phase alternating current motor is connected to a first motor controller, the output of the first motor controller is connected to a third three-phase alternating current motor, the output of the second three-phase alternating current motor is connected to a second motor controller, the output of the second motor controller is connected to the input of a power battery, and the output of the power battery is connected back to the cooling liquid tank to form a heating circulation loop, so that the heating of the power battery is realized.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A motor control circuit, comprising:

the inductive energy storage module is connected with the anode of the power supply equipment and the input end of the first switch module; the input end of the inductive energy storage module is connected with the anode of the power supply equipment and the input end of the first switch module, and the first output end, the second output end and the third output end of the inductive energy storage module are respectively connected with a three-phase bridge arm of a three-phase inverter;

the control module is respectively connected with the first switch module, the second switch module, the inductance energy storage module, the three-phase inverter, the three-phase alternating current motor, the third switch module and the power battery;

the inductance energy storage module comprises an inductance, a fourth switching element, a fifth switching element and a sixth switching element, wherein a first end of the inductance is an input end of the inductance energy storage module, a second end of the inductance is commonly connected with a first end of the fourth switching element, a first end of the fifth switching element and a first end of the sixth switching element, a second end of the fourth switching element is a first output end of the inductance energy storage module, a second end of the fifth switching element is a second output end of the inductance energy storage module, and a second end of the sixth switching element is a third output end of the inductance energy storage module;

or the inductive energy storage module comprises an inductor, a fourth switching element, a fifth switching element and a sixth switching element, wherein a first end of the inductor is connected with the input end of the first switching module and the positive electrode of the power supply equipment, a second end of the inductor is connected with a first end of the fourth switching element, a second end of the fourth switching element is connected with a first phase bridge arm of the three-phase inverter and a first end of the fifth switching element, a second end of the fifth switching element is connected with a second phase bridge arm of the three-phase inverter, and a first end and a second end of the sixth switching element are respectively connected with a second phase bridge arm and a third phase bridge arm of the three-phase inverter;

or the inductive energy storage module comprises an inductor, a fourth switching element, a fifth switching element and a sixth switching element, wherein a first end of the inductor is connected with the input end of the first switching module and the positive electrode of the power supply equipment, a second end of the inductor is connected with a first end of the fourth switching element, a second end of the fourth switching element is connected with a first phase bridge arm of the three-phase inverter and a first end of the fifth switching element, a second end of the fifth switching element is connected with a second phase bridge arm of the three-phase inverter, and a first end and a second end of the sixth switching element are respectively connected with the first phase bridge arm and the third phase bridge arm of the three-phase inverter;

or the inductive energy storage module comprises an inductor, a fourth switching element and a fifth switching element, a first end of the inductor is connected with the input end of the first switching module and the positive electrode of the power supply device, a second end of the inductor is connected with a first end of the fourth switching element, a second end of the fourth switching element is connected with a first phase bridge arm of the three-phase inverter and a first end of the fifth switching element, and a second end of the fifth switching element is connected with a second phase bridge arm of the three-phase inverter;

or the inductance energy storage module comprises an inductance, a fourth switching element and a fifth switching element, a first end of the inductance is connected with the input end of the first switching module and the positive electrode of the power supply device, a second end of the inductance is connected with a first end of the fourth switching element, a second end of the fourth switching element is connected with a first phase bridge arm of the three-phase inverter and a first end of the fifth switching element, and a second end of the fifth switching element is connected with a third phase bridge arm of the three-phase inverter.

2. The motor control circuit of claim 1 further comprising a first capacitive module having a first end coupled to the positive terminal of the power supply, the input of the first switching module, and the inductive energy storage module, and a second end coupled to the output of the second switching module, the three-phase inverter, and the third switching module.

3. The motor control circuit of claim 1 further comprising a second capacitance module connected to the three-phase inverter, the third switch module, the second switch module, and positive and negative poles of the power battery.

4. A power battery charging method based on the motor control circuit of claim 1, wherein the power battery charging method comprises:

5. A power battery charging method based on the motor control circuit of claim 2, wherein the power battery charging method comprises:

6. A power battery heating method based on the motor control circuit of claim 1, wherein the power battery heating method comprises:

and controlling the three-phase inverter and the inductive energy storage module, so that the energy storage process of the inductive energy storage module and the discharge process of the inductive energy storage module are alternately performed by the power supply equipment, so that the inductive energy storage module and the three-phase inverter generate heat in the discharge process, heat is applied to a heat exchange medium flowing through at least one of the inductive energy storage module and the three-phase inverter, and the temperature of the power battery is increased when the heated heat exchange medium flows through the power battery again.

7. A power battery heating method based on the motor control circuit of claim 1, wherein the power battery heating method comprises:

8. A power battery heating method based on the motor control circuit of claim 3, wherein the power battery heating method comprises:

9. A power battery heating method based on the motor control circuit of claim 1, wherein the power battery heating method comprises:

10. A power battery heating method based on the motor control circuit of claim 2, wherein the power battery heating method comprises:

controlling the three-phase inverter and the inductive energy storage module to enable the power battery to carry out energy storage process on the inductive energy storage module and a three-phase coil of the three-phase alternating current motor, charging process on the inductive energy storage module and a three-phase coil of the three-phase alternating current motor to a first capacitor module, discharging process on the inductive energy storage module and the three-phase coil of the three-phase alternating current motor, reverse charging process on the first capacitor module by the three-phase coil of the three-phase alternating current motor and the inductive energy storage module and discharging process on the inductive energy storage module by the first capacitor module to be carried out alternately in sequence, so that electric energy provided by the power battery generates heat during the working process of the inductive energy storage module, the three-phase inverter and the three-phase alternating current motor and flows through the inductive energy storage module, And heating the heat exchange medium of at least one of the three-phase inverter and the three-phase alternating current motor, and increasing the temperature of the power battery when the heated heat exchange medium flows through the power battery.

11. A vehicle including the motor control circuit according to any one of claims 1 to 3, the vehicle further including a power battery, a coolant tank, a water pump that inputs coolant in the coolant tank to the water line in accordance with a control signal, and a water line that passes through the power battery and the motor control circuit.