CN114701377B - Electric automobile charging system and electric automobile - Google Patents
Electric automobile charging system and electric automobile Download PDFInfo
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- CN114701377B CN114701377B CN202111342643.0A CN202111342643A CN114701377B CN 114701377 B CN114701377 B CN 114701377B CN 202111342643 A CN202111342643 A CN 202111342643A CN 114701377 B CN114701377 B CN 114701377B
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- charging pile
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
- B60L53/16—Connectors, e.g. plugs or sockets, specially adapted for charging electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
- B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The application discloses an electric automobile charging system and an electric automobile, comprising: a motor inductance and a motor controller; the motor inductor comprises a first inductor, a second inductor and a third inductor; the first end of the first inductor, the first end of the second inductor and the first end of the third inductor are connected; the second end of the first inductor is used for being connected with the first output end of the charging pile; and the motor controller is used for controlling the second end of the second inductor and the second end of the third inductor to be respectively connected with the second output end of the charging pile, or controlling the second end of the second inductor and the second end of the third inductor to be respectively connected with the first input end of the battery, so that the voltage output by the charging pile is output to the battery after being increased. The electric automobile can be matched with the charging pile with lower output voltage on the premise that the booster circuit is not additionally added, so that the cost of the charging system of the electric automobile is reduced, and the occupied space of the charging system in the electric automobile is also reduced.
Description
Technical Field
The application relates to the field of electric automobiles, in particular to an electric automobile charging system and an electric automobile.
Background
With the development of new energy, the application of electric automobiles is also becoming more and more widespread. The output voltage of the existing charging pile may be smaller than the rated charging voltage of the battery of the electric vehicle. In order to boost the output voltage of the charging post, thereby charging the battery, a boost circuit may be included in a charging system in the electric vehicle. Through this boost circuit, electric automobile can be with the voltage boost of charging the electric pile output, charges for electric automobile's battery again to make electric automobile can match the lower charging pile of output voltage.
However, adding an additional boost circuit will increase the cost of the electric vehicle and occupy the equipment space inside the electric vehicle, so a battery vehicle charging system with lower cost and smaller occupied space is urgently needed at present.
Disclosure of Invention
In order to solve the technical problems, the application provides an electric vehicle charging system and an electric vehicle, which are used for reducing the cost and occupied space of the charging system.
In order to achieve the above object, the technical solution provided by the embodiments of the present application is as follows:
the embodiment of the application provides an electric automobile charging system, which comprises: a motor inductance and a motor controller;
the motor inductor comprises a first inductor, a second inductor and a third inductor; the first end of the first inductor, the first end of the second inductor and the first end of the third inductor are connected;
the second end of the first inductor is used for being connected with the first output end of the charging pile; the second end of the second inductor and the second end of the third inductor are respectively connected with the first end and the second end of the motor controller; the third end of the motor controller is used for being connected with the second output end of the charging pile; the fourth end of the motor controller is used for being connected with the first input end of the battery; the fifth end of the motor controller is used for being connected with the second input end of the battery;
the motor controller is used for controlling the second end of the second inductor and the second end of the third inductor to be respectively connected with the second output end of the charging pile, or controlling the second end of the second inductor and the second end of the third inductor to be respectively connected with the first input end of the battery, so that the voltage output by the charging pile is output to the battery after being increased.
As one possible implementation, the motor controller includes: an inverter and a control unit; the inverter comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube;
the first end of the first switching tube, the first end of the second switching tube and the first end of the third switching tube are used for being connected with a first input end of the battery; the second end of the first switching tube is connected with the first end of the fourth switching tube; the second end of the second switching tube is connected with the first end of the fifth switching tube; the second end of the third switching tube is connected with the first end of the sixth switching tube; the second end of the fourth switching tube, the second end of the fifth switching tube and the second end of the sixth switching tube are used for being connected with a second input end of the battery;
the second end of the first inductor is connected with the second end of the first switching tube, the second end of the second inductor is connected with the second end of the second switching tube, and the second end of the third inductor is connected with the second end of the third switching tube.
As a possible implementation manner, the control unit is used for controlling the fourth switching tube to be opened;
the control unit is further configured to control the fifth switching tube and the sixth switching tube to be closed, so that the second end of the second inductor and the second end of the third inductor are respectively connected with the second output end of the charging pile; or, the fifth switching tube and the sixth switching tube are controlled to be disconnected, so that the second end of the second inductor and the second end of the third inductor are connected with the first input end of the battery through diodes in the second switching tube and the third switching tube.
As a possible embodiment, the method further includes: a first switch and a second switch;
a first end of the first switch is connected with a second end of the first inductor; the second end of the first switch is used for being connected with the first output end of the charging pile; the first end of the second switch is used for being connected with the first input end of the battery; the second end of the second switch is used for being connected with the first output end of the charging pile;
the control unit is further used for closing the first switch and opening the second switch when the output voltage of the charging pile is smaller than the charging voltage of the battery.
As a possible embodiment, the method further includes: a capacitor;
the first end of the capacitor is connected with the first output end of the charging pile; and the second end of the capacitor is connected with the second output end of the charging pile.
As a possible embodiment, the method further includes: a clutch;
the clutch is used for enabling the rotor of the motor to be disconnected from the electric shaft when the first switch is closed.
As a possible embodiment, the method further includes: a parking device;
the parking device is used for fixing the rotor of the motor when the first switch is closed.
As a possible implementation manner, the clutch of the electric automobile is a single-phase clutch, and the motor controller is further configured to control the rotor of the motor to rotate to a position where the magnetic field direction of the rotor is at the same level as the magnetic field direction of the stator when the first switch is closed.
As a possible embodiment, the motor controller is specifically configured to: when the position of the rotor is in a first range, controlling the voltage of the rotor to be a preset voltage so that the rotor of the motor rotates to the position that the magnetic field direction of the rotor and the magnetic field direction of the stator are at the same horizontal position; and when the position of the rotor is in the second range, applying a preset torque to the rotor so as to enable the rotor to rotate to a position corresponding to the first range.
According to the above-mentioned electric automobile charging system, the embodiment of the application further provides an electric automobile, including: a motor inductance, a motor controller and a battery;
the motor inductor comprises a first inductor, a second inductor and a third inductor; the first end of the first inductor, the first end of the second inductor and the first end of the third inductor are connected;
the second end of the first inductor is used for being connected with the first output end of the charging pile; the second end of the second inductor and the second end of the third inductor are respectively connected with the first end and the second end of the motor controller; the third end of the motor controller is used for being connected with the second output end of the charging pile; the fourth end of the motor controller is connected with the first input end of the battery; the fifth end of the motor controller is connected with the second input end of the battery;
the motor controller is used for controlling the second end of the second inductor and the second end of the third inductor to be respectively connected with the second output end of the charging pile, or controlling the second end of the second inductor and the second end of the third inductor to be respectively connected with the first input end of the battery, so that the voltage output by the charging pile is output to the battery after being increased.
According to the technical scheme, the application has the following beneficial effects:
the embodiment of the application provides an electric automobile charging system, which comprises: a motor inductance and a motor controller; the motor inductor comprises a first inductor, a second inductor and a third inductor; the first end of the first inductor, the first end of the second inductor and the first end of the third inductor are connected; the second end of the first inductor is used for being connected with the first output end of the charging pile; the second end of the second inductor and the second end of the third inductor are respectively connected with the first end and the second end of the motor controller; the third end of the motor controller is used for connecting with the second output end of the charging pile; the fourth end of the motor controller is used for being connected with the first input end of the battery; the fifth end of the motor controller is used for connecting with the second input end of the battery; and the motor controller is used for controlling the second end of the second inductor and the second end of the third inductor to be respectively connected with the second output end of the charging pile, or controlling the second end of the second inductor and the second end of the third inductor to be respectively connected with the first input end of the battery, so that the voltage output by the charging pile is output to the battery after being increased.
As can be seen from the above, in the electric vehicle charging system provided by the embodiment of the application, the motor inductor is used as the inductor in the boost circuit, and the motor controller is used as the switch and the diode in the boost circuit, so that the original components in the electric vehicle are utilized to form the boost circuit for charging the battery of the electric vehicle, so that the voltage output by the charging pile is increased and then output to the battery. Therefore, the electric vehicle charging system provided by the embodiment of the application can enable the electric vehicle to be matched with the charging pile with lower output voltage on the premise of not additionally adding the booster circuit, thereby reducing the cost of the electric vehicle charging system and reducing the space occupied by the charging system in the electric vehicle.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an electric vehicle charging system according to an embodiment of the present application;
fig. 2 is a schematic diagram of another electric vehicle charging system according to an embodiment of the present application;
fig. 3 is a schematic diagram of an electric vehicle charging system according to an embodiment of the present application;
fig. 4 is a schematic diagram of another electric vehicle charging system according to an embodiment of the present application;
fig. 5 is a schematic diagram of a motor rotor control method according to an embodiment of the present application;
fig. 6 is a schematic diagram of an electric vehicle according to an embodiment of the present application.
Detailed Description
In order to better understand the scheme provided by the embodiment of the present application, before introducing the method provided by the embodiment of the present application, a scenario of application of the scheme of the embodiment of the present application is first described.
With the development of new energy, the application of electric automobiles is also becoming more and more widespread. The output voltage of the existing charging pile may be smaller than the rated charging voltage of the battery of the electric vehicle. In order to boost the output voltage of the charging post, thereby charging the battery, a boost circuit may be included in a charging system in the electric vehicle. Through this boost circuit, electric automobile can be with the voltage boost of charging the electric pile output, charges for electric automobile's battery again to make electric automobile can match the lower charging pile of output voltage. However, adding an additional boost circuit will increase the cost of the electric vehicle and occupy the equipment space inside the electric vehicle, so a battery vehicle charging system with lower cost and smaller occupied space is urgently needed at present.
In order to solve the technical problems described above, the embodiment of the application provides an electric vehicle charging system, which uses a motor inductance as an inductance in a boost circuit and a switching tube in a motor controller as a switching tube in the boost circuit, so that an original component in an electric vehicle is utilized to form the boost circuit for charging a battery of the electric vehicle, so that the voltage output by a charging pile is increased and then is output to the battery. Therefore, the electric vehicle charging system provided by the embodiment of the application can enable the electric vehicle to be matched with the charging pile with lower output voltage on the premise of not additionally adding the booster circuit, thereby reducing the cost of the electric vehicle charging system and reducing the space occupied by the charging system in the electric vehicle.
In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of embodiments of the application will be rendered by reference to the appended drawings and appended drawings.
Referring to fig. 1, the schematic diagram of an electric vehicle charging system according to an embodiment of the present application is shown.
As shown in fig. 1, an electric vehicle charging system provided by an embodiment of the present application includes: motor inductance 100 and motor controller 200. The motor inductor 100 includes a first inductor L1, a second inductor L2, and a third inductor L3; the first end of the first inductor L1, the first end of the second inductor L2 and the first end of the third inductor L3 are connected.
The second end of the first inductor L1 is connected to the first output end of the charging pile 300; the second end of the second inductor L2 and the second end of the third inductor L3 are respectively connected with the first end 1 and the second end 2 of the motor controller 200; the third end 3 of the motor controller 200 is used for connecting with the second output end of the charging pile 300; the fourth terminal 4 of the motor controller 200 is used for being connected with the first input terminal of the battery 400; the fifth terminal 5 of the motor controller 200 is for connection to a second input of the battery 400.
The motor controller 200 is configured to control the second end of the second inductor L2 and the second end of the third inductor L3 to be respectively connected to the second output end of the charging pile 300, or control the second end of the second inductor L2 and the second end of the third inductor L3 to be respectively connected to the first input end of the battery 400, so that the voltage output by the charging pile 300 is increased and then output to the battery 400.
In order to facilitate description, the scheme provided by the embodiment of the application is described below by taking the first output end of the charging pile as a positive output end and taking the first input end of the battery as a positive electrode as an example. It should be appreciated that when the second end of the second inductor and the second end of the third inductor controlled by the motor controller are connected to the second output end of the charging pile 300, respectively, current flows from the positive output end of the charging pile through the first inductor, then flows through the second inductor and the third inductor, and flows into the negative electrode of the charging pile through the motor controller. Therefore, the motor inductor is connected between the positive output end and the negative output end of the charging pile in parallel, the charging pile charges the inductor, and the current on the inductor is increased.
When the second end of the second inductor and the second end of the third inductor controlled by the motor controller are respectively connected with the second output end of the charging pile 300, current flows out from the positive output end of the charging pile, passes through the first inductor, then flows through the second inductor and the third inductor, and flows into the anode of the battery through the motor controller. And then the current flows out of the negative electrode of the battery, flows through the motor controller and flows into the negative output end of the charging pile. Thus, the charging pile and the motor inductor are connected in series to charge the battery, and the current on the motor inductor is reduced. Because the charging pile and the motor inductor are connected in series to charge the battery, the charging voltage at two ends of the battery is greater than the voltage output by the charging pile, so that the voltage output by the charging pile is output to the battery after being increased.
Referring to fig. 2, a schematic diagram of another electric vehicle charging system according to an embodiment of the present application is shown.
The positive output end of the charging pile 300 in the embodiment of the present application may also be connected to the first end of the first inductor L1, and the second end of the first inductor L1 is connected to the sixth end 6 of the motor controller 200. Thus, the current output by the charging pile can flow into the motor controller through the first inductor L1, the second inductor L2 and the third inductor L3 at the same time. However, the scheme needs to lead out the central line of the motor inductor, the transformation cost is high, and the inductance value of the motor inductor is low due to the fact that three inductors in the motor inductor are connected in parallel, so that the boosting efficiency is low.
As a possible implementation manner, the motor controller provided in the embodiment of the present application includes: an inverter and a control unit; the inverter comprises a first group of switching tubes and a second group of switching tubes; the control unit is used for controlling the first group of switching tubes to be closed so that the second end of the second inductor and the second end of the third inductor are respectively connected with the second output end of the charging pile; or, the first group of switching tubes are controlled to be disconnected, so that the second end of the second inductor and the second end of the third inductor are connected with the first input end of the battery through the diodes in the second group of switching tubes.
The first to fifth switching transistors provided in the embodiments of the present application may be insulated gate bipolar transistors (IGBTs, insulated Gate Bipolar Transistor) or Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFETs).
The specific structures of the first group of switching tubes and the second group of switching tubes provided in the embodiment of the application will be specifically described below with reference to the drawings by taking an IGBT as an example.
Referring to fig. 3, the schematic diagram of an electric vehicle charging system according to an embodiment of the present application is shown.
As a possible implementation manner, as shown in fig. 3, a motor controller 200 provided in an embodiment of the present application includes: an inverter 201 and a control unit 202; the inverter comprises a first switching tube K1, a second switching tube K2, a third switching tube K3, a fourth switching tube K4, a fifth switching tube K5 and a sixth switching tube K6;
the first end of the first switching tube K1, the first end of the second switching tube K2 and the first end of the third switching tube K3 are used for being connected with the first input end of the battery 400; the second end of the first switching tube K1 is connected with the first end of the fourth switching tube K4; the second end of the second switching tube K2 is connected with the first end of the fifth switching tube K5; the second end of the third switching tube K3 is connected with the first end of the sixth switching tube K6; the second end of the fourth switching tube K4, the second end of the fifth switching tube K5 and the second end of the sixth switching tube K6 are used for being connected with the second input end of the battery 400;
the second end of the first inductor L1 is connected with the second end of the first switching tube K1, the second end of the second inductor L2 is connected with the second end of the second switching tube K2, and the second end of the third inductor L3 is connected with the second end of the third switching tube K3.
And the control unit is used for controlling the disconnection of the fourth switching tube K4.
The control unit is also used for controlling the closing of the fifth switching tube K5 and the sixth switching tube K6 so that the second end of the second inductor and the second end of the third inductor are respectively connected with the second output end of the charging pile; or, the fifth switching tube K5 and the sixth switching tube K6 are controlled to be opened, so that the second end of the second inductor and the second end of the third inductor are connected with the first input end of the battery through diodes in the second switching tube K2 and the third switching tube K3.
It should be understood that when the control unit 202 controls the fourth switching tube K4 to be opened and the fifth switching tube K5 and the sixth switching tube K6 to be closed, the current flowing from the positive output end of the charging pile 300 flows into the negative output end of the charging pile 300 through the closed fifth switching tube K5 and sixth switching tube K6 after passing through the motor inductor 100. When the control unit 202 controls the fifth switching tube K5 and the sixth switching tube K6 to be turned off, the current flowing from the positive output end of the charging pile 300 flows into the positive electrode of the battery 400 through the diode in the second switching tube and the diode in the third switching tube after passing through the motor inductor 100, and then flows out from the negative electrode of the battery 400 and flows into the negative output end of the charging pile 300.
The above structure in the motor controller is merely an example, and the scheme provided by the present application may be implemented as long as the circuit can reach the effects of the switch and the diode in the boost circuit, and the embodiment of the present application is not limited herein.
In order to stabilize the voltage output by the charging pile, as a possible implementation manner, the electric vehicle charging system provided by the embodiment of the application may further include: and a capacitor. Specifically, a first end of the capacitor is connected with a positive output end of the charging pile; the second end of the capacitor is connected with the negative output end of the charging pile. It should be understood that the capacitor is connected in parallel between the first output end and the second output end of the charging pile, so that an effect of stabilizing the output voltage of the charging pile can be achieved, and the output voltage of the charging pile is stable.
Referring to fig. 4, a schematic diagram of another electric vehicle charging system according to an embodiment of the present application is shown.
As shown in fig. 4, the charging system provided by the embodiment of the present application may further include: a first switch Q1 and a second switch Q2. The first end of the first switch Q1 is connected with the second end of the first inductor L1; the second end of the first switch Q1 is used for connecting with the first output end of the charging pile 300; a first terminal of the second switch Q2 is connected to a first input terminal of the battery 400; the second end of the second switch Q2 is used for connecting with the first output end of the charging pile 300; the control unit 202 is further configured to close the first switch Q1 and open the second switch Q2 when the output voltage of the charging pile 300 is less than the charging voltage of the battery 400.
It should be appreciated that when the first switch Q1 is closed and the second switch Q2 is opened, the voltage output from the charging pile 300 will be boosted through the motor inductor 100 and the motor controller 200 and then output to the battery 400. When the first switch Q1 is turned off and the second switch Q2 is turned on, the output voltage of the charging pile 300 directly charges the battery 400. Therefore, when the output voltage of the charging post 300 is smaller than the charging voltage of the battery 400, the first switch Q1 may be closed and the second switch Q2 may be opened, so that the battery may be charged through the charging post having the smaller output voltage. When the output voltage of the charging post 300 is equal to or greater than the charging voltage of the battery 400, the second switch Q2 may be closed and the first switch Q1 may be opened, so that the battery may also be charged through the charging post having a greater or equal output voltage.
When the charging circuit is used for charging the battery, the inventor finds that the rotor of the motor rotates to drive the electric automobile to generate displacement due to the difference of currents on the first inductor, the second inductor and the third inductor in the motor inductor, so that the electric automobile generates displacement when being charged, and the safety risk is brought. In order to solve this problem, three schemes are provided as examples in the embodiment of the present application, and the three schemes provided in the embodiment of the present application will be described below.
As a possible implementation manner, the electric vehicle charging system provided by the embodiment of the present application further includes: a clutch. The clutch is used for enabling a rotor of the motor to be disconnected from the electric shaft when the first switch is closed. It will be appreciated that when the first switch is closed, the battery of the electric vehicle is being charged through the motor inductance and the motor controller, and that uneven current will be generated in the motor inductance, so that the rotor of the motor can be disengaged from the electric shaft at this time. Therefore, when the rotor of the motor rotates, the electric shaft is not driven to rotate, and the electric automobile is prevented from generating displacement.
As another possible implementation manner, the electric automobile charging system provided by the embodiment of the application further includes: parking device. Parking means for fixing the rotor of the motor when the first switch is closed. It should be appreciated that when the first switch is closed, the battery of the electric vehicle is being charged through the motor inductor and the motor controller, and uneven current will be generated on the motor inductor, so that the rotor of the motor can be fixed through the parking device at this time, thereby avoiding displacement of the electric vehicle.
As a further possible implementation manner, the clutch of the electric automobile provided by the embodiment of the application is a single-phase clutch, and the motor controller is further configured to control the rotor of the motor to rotate to a position where the magnetic field direction of the rotor and the magnetic field direction of the stator are at the same horizontal position when the first switch is closed.
Specifically, the motor controller is specifically configured to: when the position of the rotor is in the first range, controlling the voltage of the stator to be a preset voltage so that the rotor of the motor rotates to the position that the magnetic field direction of the rotor is at the same horizontal position as the magnetic field direction of the stator; when the position of the rotor is in the second range, a preset torque is applied to the rotor so as to enable the rotor to rotate to a position corresponding to the first range. It will be appreciated that when the rotor is rotated to a position where the magnetic field direction of the rotor is at the same level as the magnetic field direction of the stator, the rotor does not produce positive torque. If the rotor rotates to generate negative torque, the clutch of the electric automobile is a single-phase clutch, so that the negative torque can not cause the electric automobile to generate displacement.
Referring to fig. 5, a schematic diagram of a motor rotor control method according to an embodiment of the present application is shown.
As an example, with the rotor of the motor rotating to the magnetic field direction of the rotor at the same horizontal position as the magnetic field direction of the stator at 0 °, when the rotor of the motor is positioned at 45 ° to 180 °, a preset torque is applied to the rotor of the motor, which is a negative torque such that the position of the rotor of the motor is 0 ° to 45 °, and then a preset voltage is applied to the stator such that the position of the rotor is positioned at 5 ° to-5 °, i.e., the magnetic field direction of the rotor of the motor rotating to the rotor is at the same horizontal position as the magnetic field direction of the stator.
When the rotor position of the motor is 225-360 degrees, applying a preset torque to the rotor of the motor, wherein the preset torque is negative torque, so that the rotor position of the motor is 180-225 degrees, and then applying a negative preset voltage to the stator, so that the rotor position is 175-185 degrees, namely the magnetic field direction from the rotor to the rotor of the motor and the magnetic field direction of the stator are in the same horizontal position.
In practical applications, when a negative torque is applied, if the rotor of the motor does not reach a position (45 ° to 180 ° or 180 ° to 225 °) where a preset voltage is applied, the negative torque may be reapplied and the position of the motor rotor may be measured again until the rotor reaches a position where a preset voltage can be applied. When the position of the rotor of the motor is at the position (45 ° to 180 ° or 180 ° to 225 °) where the preset voltage is applied, the preset torque may not be applied to the rotor, and the preset voltage may be directly applied to the stator stage, so that the rotor of the rotor rotating motor rotates to the position where the magnetic field direction of the rotor and the magnetic field direction of the stator are at the same horizontal position.
In summary, in the electric vehicle charging system provided by the embodiment of the application, the motor inductor is used as the inductor in the boost circuit, and the motor controller is used as the switch and the diode in the boost circuit, so that the original components in the electric vehicle are utilized to form the boost circuit for charging the battery of the electric vehicle, and the voltage output by the charging pile is output to the battery after being increased. Therefore, the electric vehicle charging system provided by the embodiment of the application can enable the electric vehicle to be matched with the charging pile with lower output voltage on the premise of not additionally adding the booster circuit, thereby reducing the cost of the electric vehicle charging system and reducing the space occupied by the charging system in the electric vehicle.
According to the electric vehicle charging system provided by the embodiment of the application, the embodiment of the application also provides an electric vehicle.
Referring to fig. 6, a schematic diagram of an electric automobile according to an embodiment of the present application is shown.
As shown in fig. 6, an electric vehicle provided in an embodiment of the present application includes: motor inductance 100, motor controller 200, and battery 400; the motor inductor 100 includes a first inductor L1, a second inductor L2, and a third inductor L3; the first end of the first inductor L1, the first end of the second inductor L2 and the first end of the third inductor L3 are connected.
The second end of the first inductor L1 is used for being connected with the first output end of the charging pile; the second end of the second inductor L2 and the second end of the third inductor L3 are connected to the first end and the second end of the motor controller 200, respectively; the third end of the motor controller 200 is used for connecting with the second output end of the charging pile; a fourth terminal of the motor controller 200 is connected to a first input terminal of the battery 400; a fifth terminal of the motor controller 200 is connected to a second input terminal of the battery 400.
The motor controller 200 is configured to control the second end of the second inductor L2 and the second end of the third inductor L3 to be respectively connected to the second output end of the charging pile, or control the second end of the second inductor L2 and the second end of the third inductor L3 to be respectively connected to the first input end of the battery 400, so that the voltage output by the charging pile 300 is output to the battery 400 after being increased.
According to the electric vehicle charging system provided by the embodiment of the application, the motor inductor is used as the inductor in the boost circuit, and the motor controller is used as the switch and the diode in the boost circuit, so that the original components in the electric vehicle are utilized to form the boost circuit for charging the battery of the electric vehicle, so that the voltage output by the charging pile is increased and then is output to the battery, the electric vehicle can be matched with the charging pile with lower output voltage on the premise of not additionally increasing the boost circuit, the cost of the electric vehicle charging system is reduced, and the space occupied by the charging system in the electric vehicle is also reduced.
From the above description of embodiments, it will be apparent to those skilled in the art that all or part of the steps of the above described example methods may be implemented in software plus necessary general purpose hardware platforms. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network communication device such as a media gateway, etc.) to execute the method described in the embodiments or some parts of the embodiments of the present application.
It should be noted that, in the present description, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different manner from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the method disclosed in the embodiment, since it corresponds to the system disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the system part.
It should also be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments, to enable any person skilled in the art to make or use the present application, will be readily apparent to those of ordinary skill in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. An electric vehicle charging system, comprising: the motor comprises a motor inductor, a motor controller, a first switch and a second switch;
the motor inductor comprises a first inductor, a second inductor and a third inductor; the first end of the first inductor, the first end of the second inductor and the first end of the third inductor are connected;
the second end of the first inductor is used for being connected with the first output end of the charging pile; the second end of the second inductor and the second end of the third inductor are respectively connected with the first end and the second end of the motor controller; the third end of the motor controller is used for being connected with the second output end of the charging pile; the fourth end of the motor controller is used for being connected with the first input end of the battery; the fifth end of the motor controller is used for being connected with the second input end of the battery;
the motor controller is used for controlling the second end of the second inductor and the second end of the third inductor to be respectively connected with the second output end of the charging pile, or controlling the second end of the second inductor and the second end of the third inductor to be respectively connected with the first input end of the battery, so that the voltage output by the charging pile is increased and then is output to the battery;
a first end of the first switch is connected with a second end of the first inductor; the second end of the first switch is used for being connected with the first output end of the charging pile; the first end of the second switch is used for being connected with the first input end of the battery; the second end of the second switch is used for being connected with the first output end of the charging pile;
the motor controller is further used for closing the first switch and opening the second switch when the output voltage of the charging pile is smaller than the charging voltage of the battery;
the clutch of the electric automobile is a single-phase clutch, and the motor controller is further used for controlling the rotor of the motor to rotate to the position that the magnetic field direction of the rotor and the magnetic field direction of the stator are in the same horizontal position when the first switch is closed.
2. The system of claim 1, wherein the motor controller comprises: an inverter and a control unit; the inverter comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube;
the first end of the first switching tube, the first end of the second switching tube and the first end of the third switching tube are used for being connected with a first input end of the battery; the second end of the first switching tube is connected with the first end of the fourth switching tube; the second end of the second switching tube is connected with the first end of the fifth switching tube; the second end of the third switching tube is connected with the first end of the sixth switching tube; the second end of the fourth switching tube, the second end of the fifth switching tube and the second end of the sixth switching tube are used for being connected with a second input end of the battery;
the second end of the first inductor is connected with the second end of the first switching tube, the second end of the second inductor is connected with the second end of the second switching tube, and the second end of the third inductor is connected with the second end of the third switching tube.
3. The system according to claim 2, wherein the control unit is configured to control the fourth switching tube to be turned off;
the control unit is further configured to control the fifth switching tube and the sixth switching tube to be closed, so that the second end of the second inductor and the second end of the third inductor are respectively connected with the second output end of the charging pile; or, the fifth switching tube and the sixth switching tube are controlled to be disconnected, so that the second end of the second inductor and the second end of the third inductor are connected with the first input end of the battery through diodes in the second switching tube and the third switching tube.
4. The system of claim 1, further comprising: a capacitor;
the first end of the capacitor is connected with the first output end of the charging pile; and the second end of the capacitor is connected with the second output end of the charging pile.
5. The system of claim 1, wherein the motor controller is specifically configured to: when the position of the rotor is in a first range, controlling the voltage of the rotor to be a preset voltage so that the rotor of the motor rotates to the position that the magnetic field direction of the rotor and the magnetic field direction of the stator are at the same horizontal position; and when the position of the rotor is in the second range, applying a preset torque to the rotor so as to enable the rotor to rotate to a position corresponding to the first range.
6. An electric automobile, characterized by comprising: the motor comprises a motor inductor, a motor controller, a battery, a first switch and a second switch;
the motor inductor comprises a first inductor, a second inductor and a third inductor; the first end of the first inductor, the first end of the second inductor and the first end of the third inductor are connected;
the second end of the first inductor is used for being connected with the first output end of the charging pile; the second end of the second inductor and the second end of the third inductor are respectively connected with the first end and the second end of the motor controller; the third end of the motor controller is used for being connected with the second output end of the charging pile; the fourth end of the motor controller is connected with the first input end of the battery; the fifth end of the motor controller is connected with the second input end of the battery;
the motor controller is used for controlling the second end of the second inductor and the second end of the third inductor to be respectively connected with the second output end of the charging pile, or controlling the second end of the second inductor and the second end of the third inductor to be respectively connected with the first input end of the battery, so that the voltage output by the charging pile is increased and then is output to the battery;
a first end of the first switch is connected with a second end of the first inductor; the second end of the first switch is used for being connected with the first output end of the charging pile; the first end of the second switch is used for being connected with the first input end of the battery; the second end of the second switch is used for being connected with the first output end of the charging pile;
the motor controller is further used for closing the first switch and opening the second switch when the output voltage of the charging pile is smaller than the charging voltage of the battery;
the clutch of the electric automobile is a single-phase clutch, and the motor controller is further used for controlling the rotor of the motor to rotate to the position that the magnetic field direction of the rotor and the magnetic field direction of the stator are in the same horizontal position when the first switch is closed.
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| JP2009065808A (en) * | 2007-09-10 | 2009-03-26 | Toyota Motor Corp | Charging device for electric vehicle and control method thereof |
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| CN111873830A (en) * | 2020-09-11 | 2020-11-03 | 北京理工大学 | Distributed dual-motor driving and vehicle-mounted charging integrated system for electric automobile and charging control method thereof |
| CN112937332A (en) * | 2021-01-21 | 2021-06-11 | 华为技术有限公司 | Charging system and electric automobile |
| CN113043870A (en) * | 2021-04-30 | 2021-06-29 | 重庆长安新能源汽车科技有限公司 | Power battery charging system and electric automobile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2895593B1 (en) * | 2005-12-23 | 2008-03-07 | Valeo Equip Electr Moteur | ROTATING ELECTRIC MACHINE WITH DECOUPLED PHASES |
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| JP2009065808A (en) * | 2007-09-10 | 2009-03-26 | Toyota Motor Corp | Charging device for electric vehicle and control method thereof |
| CN110014874A (en) * | 2017-11-03 | 2019-07-16 | 现代自动车株式会社 | The control method of vehicle and vehicle |
| CN111873830A (en) * | 2020-09-11 | 2020-11-03 | 北京理工大学 | Distributed dual-motor driving and vehicle-mounted charging integrated system for electric automobile and charging control method thereof |
| CN112937332A (en) * | 2021-01-21 | 2021-06-11 | 华为技术有限公司 | Charging system and electric automobile |
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