CN111193388A - Circuit, driving method thereof and vehicle - Google Patents

Circuit, driving method thereof and vehicle Download PDF

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Publication number
CN111193388A
CN111193388A CN202010087993.6A CN202010087993A CN111193388A CN 111193388 A CN111193388 A CN 111193388A CN 202010087993 A CN202010087993 A CN 202010087993A CN 111193388 A CN111193388 A CN 111193388A
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CN
China
Prior art keywords
switching device
pulse capacitor
pulse
capacitor
terminal
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Pending
Application number
CN202010087993.6A
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Chinese (zh)
Inventor
邵瑞
王东生
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BAIC Group ORV Co ltd
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BAIC Group ORV Co ltd
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Priority to CN202010087993.6A priority Critical patent/CN111193388A/en
Publication of CN111193388A publication Critical patent/CN111193388A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/007—Physical arrangements or structures of drive train converters specially adapted for the propulsion motors of electric vehicles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/123—Suppression of common mode voltage or current
    • 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
    • Y02T10/64—Electric machine technologies in electromobility

Abstract

The invention provides a circuit for reducing common mode current emitted by a vehicle-mounted motor controller to the outside, a driving method thereof and a vehicle, wherein the positive electrode of a direct current bus in the circuit is connected to the first end of a seventh pulse capacitor; the second end of the seventh pulse capacitor is respectively connected with the first end of the first pulse capacitor, the first end of the third pulse capacitor and the first end of the fifth pulse capacitor; the second end of the first pulse capacitor is connected with the first end of the second pulse capacitor, the second end of the third pulse capacitor is connected with the first end of the fourth pulse capacitor, and the second end of the fifth pulse capacitor is connected with the first end of the sixth pulse capacitor; the second end of the second pulse capacitor, the second end of the fourth pulse capacitor and the second end of the sixth pulse capacitor are respectively connected to the first end of the eighth pulse capacitor; the second end of the eighth pulse capacitor is connected to the negative electrode of the direct current bus; the second end of the fifth pulse capacitor is connected to a first stator coil of the motor; a second end of the third pulse capacitor is connected to the second stator coil; the second end of the first pulse capacitor is connected to the third stator coil.

Description

Circuit, driving method thereof and vehicle
Technical Field
The invention relates to the field of vehicles, in particular to a circuit for reducing common-mode current emitted to the outside by a vehicle-mounted motor controller, a driving method of the circuit and a vehicle.
Background
The vehicle-mounted motor controller drives the motor to operate in a PWM (pulse width modulation) frequency conversion mode, common-mode voltage can be generated in a motor winding by the control, shaft voltage can be established between a rotor and a machine shell by the common-mode voltage, bearing lubricant can be dried by the shaft voltage, and bearing current generated by breakdown of lubrication insulation damages the bearing. More importantly, the common-mode voltage generates very large common-mode current, the common-mode current is coupled to the vehicle body through the stator winding and the machine shell, normal work of other vehicle-mounted electrical appliances is interfered, even potential safety hazards of vehicles can be generated, and the problem of serious electromagnetic compatibility of the whole vehicle is caused.
Meanwhile, the pulse square wave of the three-phase potential PWM modulation mode output to the motor by the vehicle-mounted motor controller has very high voltage change rate du/dt, and the high du/dt not only impacts an insulating winding of the motor to cause insulation aging, but also causes extra iron loss, so that the temperature and height of the motor are high, and the service life of the motor is influenced.
At present, the influence of common mode current on the outside cannot be effectively inhibited, radio frequency disturbance of a three-phase cable on the outside cannot be well inhibited, and the problems of insulation aging and temperature rise of a motor caused by high du/dt cannot be solved in the prior art.
Disclosure of Invention
In view of the above, the invention provides a circuit for reducing common mode current emitted by a vehicle-mounted motor controller to the outside, a driving method thereof and a vehicle, and aims to solve the problems that the influence of the common mode current to the outside cannot be effectively inhibited, radio frequency disturbance of a three-phase cable to the outside cannot be well inhibited, and insulation aging and temperature rise of a motor caused by high du/dt in the prior art cannot be solved.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a circuit for reducing common-mode current emitted to the outside by a vehicle-mounted motor controller, which is characterized by comprising:
the direct current support capacitor, the first switching device, the second switching device, the third switching device, the fourth switching device, the fifth switching device and the sixth switching device;
the circuit specifically comprises:
the positive electrode of the direct current bus is respectively connected with the first end of the direct current support capacitor, the first end of the first switching device, the first end of the third switching device and the first end of the fifth switching device;
the cathode of the direct current bus is respectively connected with the second end of the direct current support capacitor, the first end of the second switching device, the first end of the fourth switching device and the first end of the sixth switching device;
the second end of the first switching device is respectively connected with the second end of the second switching device and the first end of the first stator coil of the motor;
a second end of the third switching device is connected with a second end of the fourth switching device and a first end of a second stator coil of the motor respectively;
a second end of the fifth switching device is connected with a second end of the sixth switching device and a first end of a third stator coil of the motor respectively; a second end of the first stator coil, a second end of the second stator coil, and a second end of the third stator coil are connected together;
the circuit further comprises:
the positive electrode of the direct current bus is connected to the first end of the seventh pulse capacitor; the second end of the seventh pulse capacitor is respectively connected with the first end of the first pulse capacitor, the first end of the third pulse capacitor and the first end of the fifth pulse capacitor;
the second end of the first pulse capacitor is connected with the first end of the second pulse capacitor, the second end of the third pulse capacitor is connected with the first end of the fourth pulse capacitor, and the second end of the fifth pulse capacitor is connected with the first end of the sixth pulse capacitor;
a second end of the second pulse capacitor, a second end of the fourth pulse capacitor and a second end of the sixth pulse capacitor are respectively connected to a first end of an eighth pulse capacitor;
the second end of the eighth pulse capacitor is connected to the negative electrode of the direct current bus;
the second end of the fifth pulse capacitor is also connected to a first stator coil of the motor;
the second end of the third pulse capacitor is also connected to a second stator coil of the motor;
the second end of the first pulse capacitor is also connected to a third stator coil of the motor.
Optionally, the specific steps that the second end of the seventh pulse capacitor is respectively connected to the first end of the first pulse capacitor, the first end of the third pulse capacitor, and the first end of the fifth pulse capacitor are as follows:
the second end of the seventh pulse capacitor is respectively connected with the first end of the first non-inductive resistor, the first end of the third non-inductive resistor and the first end of the fifth non-inductive resistor;
the second end of the first non-inductive resistor is connected with the first end of the first pulse capacitor, the second end of the third non-inductive resistor is connected with the first end of the third pulse capacitor, and the second end of the fifth non-inductive resistor is connected with the first end of the fifth pulse capacitor.
Optionally, the specifically that the second end of the second pulse capacitor, the second end of the fourth pulse capacitor, and the second end of the sixth pulse capacitor are respectively connected to the first end of the eighth pulse capacitor is:
the second end of the second pulse capacitor is connected with the first end of the second non-inductive resistor, the second end of the fourth pulse capacitor is connected with the first end of the fourth non-inductive resistor, and the second end of the sixth pulse capacitor is connected with the first end of the sixth non-inductive resistor;
and the second end of the second non-inductive resistor, the second end of the fourth non-inductive resistor and the second end of the sixth non-inductive resistor are respectively connected to the first end of an eighth pulse capacitor.
Optionally, the connection of the positive electrode of the dc bus to the first end of the seventh pulse capacitor specifically includes:
and the positive electrode of the direct current bus is connected to the first end of the seventh pulse capacitor through a seventh resistor.
Optionally, the connection of the second end of the eighth pulse capacitor to the negative electrode of the dc bus specifically includes:
and the second end of the eighth pulse capacitor is connected to the negative electrode of the direct current bus through an eighth resistor.
Optionally, the circuit further includes:
and a three-phase common mode choke coil provided at the periphery of a first connection line between the second terminal of the first switching device and the first stator coil, a second connection line between the second terminal of the third switching device and the second stator coil, and a third connection line between the second terminal of the fifth switching device and the third stator coil.
Optionally, the three-phase common mode choke coil is a NiZn three-phase common mode choke coil.
Optionally, the three-phase common mode choke coil is a nanocrystalline three-phase common mode choke coil.
Based on the technical solution of the circuit for reducing the common mode current emitted to the outside by the vehicle-mounted motor controller, a second aspect of the invention provides a vehicle, which includes the circuit for reducing the common mode current emitted to the outside by the vehicle-mounted motor controller.
Based on the above technical solution of the circuit for reducing the common mode current emitted from the vehicle-mounted motor controller to the outside, a third aspect of the present invention provides a driving method applied to the circuit for reducing the common mode current emitted from the vehicle-mounted motor controller to the outside, where the driving method includes:
in a first period, the first switching device and the fourth switching device are closed, the positive electrode of the direct current bus outputs an A alternating current signal to the first end of the first stator coil of the motor through the first switching device, after the A alternating current signal flows through the second stator coil of the motor, a generated first target signal flows to the negative electrode of the direct current bus through the fourth switching device, a generated first high-frequency common mode signal flows to the first end of the direct current support capacitor through the third pulse capacitor and the seventh pulse capacitor, and flows to the second end of the direct current support capacitor through the fourth pulse capacitor and the eighth pulse capacitor;
in a second period, a third switching device and a sixth switching device are closed, the positive electrode of the direct current bus outputs a B alternating current signal to the first end of the second stator coil of the motor through the third switching device, after the B alternating current signal flows through the third stator coil of the motor, a generated second target signal flows to the negative electrode of the direct current bus through the sixth switching device, a generated second high-frequency common mode signal flows to the first end of the direct current support capacitor through the first pulse capacitor and the seventh pulse capacitor, and flows to the second end of the direct current support capacitor through the second pulse capacitor and the eighth pulse capacitor;
in a third period, a fifth switching device and a second switching device are closed, the positive electrode of the direct current bus outputs a C alternating current signal to the first end of the third stator coil of the motor through the fifth switching device, after the C alternating current signal flows through the first stator coil of the motor, a generated third target signal flows to the negative electrode of the direct current bus through the second switching device, a generated third high-frequency common mode signal flows to the first end of the direct current support capacitor through a fifth pulse capacitor and a seventh pulse capacitor, and flows to the second end of the direct current support capacitor through a sixth pulse capacitor and an eighth pulse capacitor.
The technical scheme of the invention has the following beneficial effects:
the circuit of the invention builds a low-impedance loop for high-frequency common-mode current to pass through at the DC input end and the AC output end of the motor controller through the pulse capacitor, and limits the common-mode current caused by the inverter system in the controller. Therefore, the radio frequency conduction and radiation disturbance level of the vehicle-mounted motor controller can be effectively inhibited, the electromagnetic compatibility of the product is improved, and the volume and the cost of the direct current high-voltage side EMI filter circuit are reduced.
Drawings
FIG. 1 is a circuit diagram of a circuit for reducing common mode current emitted externally by an on-board motor controller according to the present invention;
fig. 2 is a waveform of line voltage of ac output of the motor controller according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, a circuit for reducing common mode current emitted from an on-board motor controller, a driving method thereof and a vehicle according to the embodiments of the present invention will be described clearly and completely with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
The following description is first described in detail with reference to the accompanying drawings.
As shown in fig. 1, a circuit for reducing common mode current emitted externally by an onboard motor controller, the circuit comprising:
a direct current support capacitor C, a first switching device S1, a second switching device S2, a third switching device S3, a fourth switching device S4, a fifth switching device S5, and a sixth switching device S6;
the circuit specifically comprises:
the positive electrode of the direct current bus is respectively connected with the first end of the direct current support capacitor C, the first end of the first switching device, the first end of the third switching device and the first end of the fifth switching device;
the cathode of the direct current bus is connected with the second end of the direct current support capacitor C, the first end of the second switching device, the first end of the fourth switching device and the first end of the sixth switching device respectively;
the second end of the first switching device is respectively connected with the second end of the second switching device and the first end of the first stator coil Lsa of the motor;
a second end of the third switching device is connected to a second end of the fourth switching device and a first end of a second stator coil Lsb of the motor, respectively;
a second end of the fifth switching device is connected with a second end of the sixth switching device and a first end of a third stator coil Lsc of the motor respectively; a second end of the first stator coil Lsa, a second end of the second stator coil Lsb, and a second end of the third stator coil Lsc are connected together;
the circuit further comprises:
the positive electrode of the direct current bus is connected to a seventh pulse capacitor Cy1A first end of (a); the seventh pulse capacitor Cy1The second ends of the first and second capacitors are respectively connected with a first pulse capacitor Cx1First terminal, third pulse capacitor Cx3First terminal and fifth pulse capacitor Cx5A first end of (a);
the first pulse capacitor Cx1Second terminal and second pulse capacitor Cx2Is connected to the first terminal of the third pulse capacitor Cx3Second terminal and fourth pulse capacitor Cx4Is connected to the first terminal of the fifth pulse capacitor Cx5Second terminal and sixth pulse capacitor Cx6Is connected with the first end of the first connecting pipe;
the second pulse capacitor Cx2Second terminal, the fourth pulse capacitor Cx4And the sixth pulse capacitor Cx6Are respectively connected to the eighth pulse capacitor Cy2A first end of (a);
the eighth pulse capacitor Cy2Is connected to the negative pole of the direct current bus;
the fifth pulse capacitor Cx5Is also connected to a first stator coil Lsa of the electrical machine;
the third pulse capacitor Cx3Is also connected to a second stator coil Lsb of the motor;
the first pulse capacitor Cx1Is also connected to a third stator coil Lsc of the motor.
When the circuit is driven, the following processes are mainly included:
during the first period, the first switching device S1 and the fourth switching device S4 are closed, and the positive electrode of the dc bus outputs an a ac signal, which flows through the current, to the first end of the first stator coil Lsa of the motor through the first switching device S1After the second stator coil Lsb of the machine, the generated first target signal flows to the negative electrode of the direct current bus through the fourth switching device S4, and the generated first high-frequency common-mode signal flows through the third pulse capacitor Cx3And a seventh pulse capacitor Cy1Flows to the first end of the DC support capacitor C and passes through the fourth pulse capacitor Cx4And an eighth pulse capacitor Cy2Flows to the second end of the DC support capacitor C;
in the second period, the third switching device S3 and the sixth switching device S6 are closed, the positive pole of the dc bus outputs a B-phase ac signal to the first end of the second stator coil Lsb of the motor via the third switching device S3, the B-phase ac signal flows through the third stator coil Lsc of the motor, a second target signal is generated and flows to the negative pole of the dc bus via the sixth switching device S6, and a second high-frequency common mode signal is generated and flows through the first pulse capacitor Cx1And a seventh pulse capacitor Cy1Flows to the first end of the DC support capacitor C and passes through the second pulse capacitor Cx2And an eighth pulse capacitor Cy2Flows to the second end of the DC support capacitor C;
in a third period, the fifth switching device S5 and the second switching device S2 are closed, the positive pole of the dc bus outputs a C ac signal to the first end of the third stator coil Lsc of the motor through the fifth switching device S5, the C ac signal flows through the first stator coil Lsa of the motor, a third target signal is generated and flows to the negative pole of the dc bus through the second switching device S2, and a third high frequency common mode signal is generated and flows through the fifth pulse capacitor Cx5And a seventh pulse capacitor Cy1Flows to the first end of the DC support capacitor C and passes through the sixth pulse capacitor Cx6And an eighth pulse capacitor Cy2To the second terminal of the dc support capacitor C.
According to the specific structure and operation of the circuit, the circuit provided by the embodiment of the invention provides a low-impedance loop (including C) for the common-mode voltage generated by the PWM inverter system on the three-phase ac linex1,Cx2,Cx3,Cx4,Cx5,Cx6,Cy1,Cy2And may further comprise Rx1，Rx2，Rx3，Rx4，Rx5，Rx6，Ry1，Ry2) The common-mode voltage coupled on the vehicle of the motor control mechanism is reduced, and the common-mode current I caused by the common-mode voltage is restrainedCMTherefore, the EMI problem of the vehicle-mounted motor controller is solved.
Meanwhile, as shown in fig. 2, in the circuit provided in the embodiment of the present invention, a low-impedance path is provided for the common-mode voltage generated on the three-phase ac line by the PWM inverter system, so that the rising edge of each pulse in the line voltage waveform (composed of a group of pulse square waves) output by the ac of the motor controller can be greatly delayed, and the voltage change rate du/dt of the PWM modulation voltage output on the three-phase ac line is reduced, thereby reducing the electrical stress impact on the insulation of the stator winding, protecting the motor insulation system, reducing the heat generation of the motor core, and improving the life and reliability of the motor.
In some embodiments, the seventh pulse capacitor Cy1The second ends of the first and second capacitors are respectively connected with a first pulse capacitor Cx1First terminal, third pulse capacitor Cx3First terminal and fifth pulse capacitor Cx5The first end specifically is:
the seventh pulse capacitor Cy1The second ends of the first and second non-inductive resistors R are respectively connected withx1First terminal, third non-inductive resistor Rx3First terminal, fifth non-inductive resistor Rx5A first end of (a);
the first non-inductive resistor Rx1And the second end of the first pulse capacitor Cx1Is connected to the third non-inductive resistor Rx3And the third pulse capacitor Cx3Is connected to the fifth non-inductive resistor Rx5Second terminal of and the fifth pulse capacitor Cx5Is connected to the first end of the first housing.
In some embodiments, the second pulse capacitance Cx2Second terminal, the fourth pulse capacitor Cx4And the sixth pulse capacitor Cx6Are respectively connected to the eighth pulse capacitor Cy2The first end specifically is:
the secondPulse capacitor Cx2Second terminal and second non-inductive resistor Rx2Is connected with a fourth pulse capacitor Cx4Second terminal and fourth non-inductive resistor Rx4Is connected with the sixth pulse capacitor Cx6Second terminal and sixth non-inductive resistor Rx6Is connected with the first end of the first connecting pipe;
the second non-inductive resistor Rx2The second end of (1), the fourth non-inductive resistor Rx4The second end of (1), the sixth non-inductive resistor Rx6Are respectively connected to the eighth pulse capacitor Cy2The first end of (a).
In some embodiments, the positive electrode of the DC bus is connected to a seventh pulse capacitor Cy1The first end specifically is:
the positive electrode of the direct current bus passes through a seventh resistor Ry1Connected to a seventh pulse capacitor Cy1The first end of (a).
In some embodiments, the eighth pulse capacitor Cy2The second end of the dc bus connected to the negative electrode of the dc bus is specifically:
the eighth pulse capacitor Cy2Through an eighth resistor Ry2A negative electrode connected to the DC bus.
Specifically, the dc support capacitor C and the switching devices S1, S2, S3, S4, S5, and S6 form a main inverter circuit of the motor controller, and respectively output three-phase ac power of a phase, B phase, and C phase to Lsa, Lsb, and Lsc of the motor. Cx1,Cx2,Cx3,Cx4,Cx5,Cx6,Cy1,Cy2Is a pulse capacitor; rx1，Rx2，Rx3，Rx4，Rx5，Rx6Is a non-inductive resistor.
Pulse capacitor Cx1，Cx3，Cx5Respectively associated with a resistor Rx1，Rx3,Rx5Connected in star after being connected in series, and then the neutral point and the capacitor C are connectedy1，Resistance Ry1Is connected to the positive pole of the direct current bus in series.
Pulse capacitor Cx2，Cx4，Cx6Respectively associated with a resistor Rx2，Rx4,Rx6Connected in star after being connected in series, and then the neutral point and the capacitor C are connectedy2Resistance Ry2And the direct current bus negative electrode is connected in series.
The circuit provided by the embodiment of the invention builds the high-frequency common-mode current I at the direct current input end and the alternating current output end of the motor controller through the pulse capacitorCMLow-impedance circuit, high-frequency common-mode current I on A, B and C phases when inverter is workingCMBy passing through Cx1，Cx3，Cx5，Rx1，Rx3,Rx5And Cy1,Ry1The formed low-impedance loop returns to the positive pole of the power supply; by passing through Cx2，Cx4，Cx6，Rx2，Rx4,Rx6And Cy2，Ry2The formed low-impedance loop returns to the negative electrode of the power supply; by the circuit, the high-frequency common-mode current I is converted into the high-frequency common-mode current I as much as possibleCMThe internal circulation of the controller is limited, so that the radio frequency conduction and radiation disturbance level of the vehicle-mounted motor controller can be effectively inhibited, and the electromagnetic compatibility of the product is improved.
In addition, the low-impedance loop is simple in structure, small in overall size and weight, practical operability is achieved in vehicle-mounted application, and the volume and the cost of the direct-current high-voltage side EMI filter circuit are reduced in practical application.
In addition, the circuit is provided with Rx1，Rx2，Rx3，Rx4，Rx5，Rx6，Ry1，Ry2And the stability of the circuit is more facilitated.
In some embodiments, the circuit further comprises:
and a three-phase common mode choke coil CM provided at the periphery of a first connection line between the second terminal of the first switching device and the first stator coil, a second connection line between the second terminal of the third switching device and the second stator coil, and a third connection line between the second terminal of the fifth switching device and the third stator coil.
In some embodiments, the three-phase common mode choke CM is a NiZn three-phase common mode choke.
In some embodiments, the three-phase common mode choke CM is a nanocrystalline three-phase common mode choke.
The three-phase common mode inductor CM adopts a material (such as NiZn, nanocrystalline and the like) with high complex permeability to convert common mode current into heat energy inside the magnetic core for consumption. By the circuit, the high-frequency common-mode current I is converted into the high-frequency common-mode current I as much as possibleCMThe current is limited to circulate in the controller, common mode current is restrained from emitting outwards, and the electromagnetic compatibility of the motor controller is improved.
The embodiment of the invention also provides a vehicle, which comprises the circuit for reducing the common-mode current emitted to the outside by the vehicle-mounted motor controller.
In the circuit provided by the above embodiment, a low-impedance loop (including C) is provided for the common-mode voltage generated on the three-phase ac line by the PWM inverter systemx1,Cx2,Cx3,Cx4,Cx5,Cx6,Cy1,Cy2And may further comprise Rx1，Rx2，Rx3，Rx4，Rx5，Rx6，Ry1，Ry2) The common-mode voltage coupled on the vehicle of the motor control mechanism is reduced, and the common-mode current I caused by the common-mode voltage is restrainedCMTherefore, the EMI problem of the vehicle-mounted motor controller is solved. Meanwhile, as shown in fig. 2, in the circuit provided in the above embodiment, a low-impedance path is provided for the common-mode voltage generated by the PWM inverter system on the three-phase ac line, so that the rising edge of each pulse in the line voltage waveform (composed of a group of pulse square waves) output by the ac of the motor controller can be greatly delayed, and the voltage change rate du/dt of the PWM modulation voltage output on the three-phase ac line is reduced, thereby reducing the electrical stress impact on the insulation of the stator winding, protecting the motor insulation system, reducing the heat generation of the motor core, and improving the service life and reliability of the motor.
Therefore, the vehicle provided by the embodiment of the invention has the beneficial effects when the vehicle comprises the circuit for reducing the common-mode current emitted to the outside by the vehicle-mounted motor controller provided by the embodiment, and the description is omitted here.
The embodiment of the invention also provides a driving method, which is applied to the circuit for reducing the common-mode current emitted to the outside by the vehicle-mounted motor controller, and the driving method comprises the following steps:
in the first period, the first switching device S1 and the fourth switching device S4 are closed, the positive electrode of the direct current bus outputs an a alternating current signal to the first end of the first stator coil Lsa of the motor through the first switching device S1, after the a alternating current signal flows through the second stator coil Lsb of the motor, a first target signal is generated and flows to the negative electrode of the direct current bus through the fourth switching device S4, and a first high-frequency common mode signal is generated and flows through the third pulse capacitor Cx3And a seventh pulse capacitor Cy1Flows to the first end of the DC support capacitor C and passes through the fourth pulse capacitor Cx4And an eighth pulse capacitor Cy2Flows to the second end of the DC support capacitor C;
in the second period, the third switching device S3 and the sixth switching device S6 are closed, the positive pole of the dc bus outputs a B-phase ac signal to the first end of the second stator coil Lsb of the motor via the third switching device S3, the B-phase ac signal flows through the third stator coil Lsc of the motor, a second target signal is generated and flows to the negative pole of the dc bus via the sixth switching device S6, and a second high-frequency common mode signal is generated and flows through the first pulse capacitor Cx1And a seventh pulse capacitor Cy1Flows to the first end of the DC support capacitor C and passes through the second pulse capacitor Cx2And an eighth pulse capacitor Cy2Flows to the second end of the DC support capacitor C;
in a third period, the fifth switching device S5 and the second switching device S2 are closed, the positive pole of the dc bus outputs a C ac signal to the first end of the third stator coil Lsc of the motor through the fifth switching device S5, the C ac signal flows through the first stator coil Lsa of the motor, a third target signal is generated and flows to the negative pole of the dc bus through the second switching device S2, and a third high frequency common mode signal is generated and flows through the fifth pulse capacitor Cx5And a seventh pulse capacitor Cy1Flows to the first end of the DC support capacitor C and passes through the sixth pulse capacitor Cx6And an eighth pulse capacitor Cy2To the second terminal of the dc support capacitor C.
When the driving circuit provided by the embodiment of the invention is adopted to drive the circuit provided by the embodiment of the invention, a low-impedance loop (comprising C) is provided for the common-mode voltage generated on the three-phase alternating current line by the PWM inverter systemx1,Cx2,Cx3,Cx4,Cx5,Cx6,Cy1,Cy2And may further comprise Rx1，Rx2，Rx3，Rx4，Rx5，Rx6，Ry1，Ry2) The common-mode voltage coupled on the vehicle of the motor control mechanism is reduced, and the common-mode current I caused by the common-mode voltage is restrainedCMTherefore, the EMI problem of the vehicle-mounted motor controller is solved. Meanwhile, as shown in fig. 2, a low-impedance path is provided for the common-mode voltage generated on the three-phase alternating current line by the PWM inverter system, so that the rising edge of each pulse in the line voltage waveform (composed of a group of pulse square waves) output by the motor controller can be greatly delayed, and the voltage change rate du/dt of the PWM modulation voltage output on the three-phase alternating current line is reduced, thereby reducing the electrical stress impact on the insulation of the stator winding, protecting the motor insulation system, reducing the heat generation of the motor core, and improving the service life and reliability of the motor.
Other structures and operations of the vehicle according to the embodiment of the present invention will be understood and readily implemented by those skilled in the art, and thus will not be described in detail.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A circuit for reducing common mode current emitted externally by an on-board motor controller, the circuit comprising:
a direct current supporting capacitor (C), a first switching device (S1), a second switching device (S2), a third switching device (S3), a fourth switching device (S4), a fifth switching device (S5), a sixth switching device (S6);
the circuit specifically comprises:
the positive electrode of the direct current bus is respectively connected with the first end of the direct current support capacitor (C), the first end of the first switching device, the first end of the third switching device and the first end of the fifth switching device;
the cathode of the direct current bus is respectively connected with the second end of the direct current support capacitor (C), the first end of the second switching device, the first end of the fourth switching device and the first end of the sixth switching device;
the second end of the first switching device is respectively connected with the second end of the second switching device and the first end of a first stator coil (Lsa) of the motor;
a second terminal of the third switching device is connected to a second terminal of the fourth switching device and a first terminal of a second stator coil (Lsb) of the motor, respectively;
a second end of the fifth switching element is connected to a second end of the sixth switching element and to a first end of a third stator coil (Lsc) of the electric machine; a second end of the first stator coil (Lsa), a second end of the second stator coil (Lsb), and a second end of the third stator coil (Lsc) are connected together;
the circuit further comprises:
positive connection of the DC busTo seventh pulse capacitance (C)y1) A first end of (a); the seventh pulse capacitance (C)y1) Are respectively connected with a first pulse capacitor (C)x1) First terminal, third pulse capacitor (C)x3) And a fifth pulse capacitor (C)x5) A first end of (a);
the first pulse capacitor (C)x1) Second terminal and second pulse capacitor (C)x2) Is connected to the first terminal of the third pulse capacitor (C)x3) Second terminal and fourth pulse capacitor (C)x4) Is connected to the first terminal of the fifth pulse capacitor (C)x5) Second terminal of (1) and a sixth pulse capacitor (C)x6) Is connected with the first end of the first connecting pipe;
the second pulse capacitor (C)x2) The second terminal of (a), the fourth pulse capacitance (C)x4) And the sixth pulse capacitance (C)x6) Are respectively connected to the eighth pulse capacitors (C)y2) A first end of (a);
the eighth pulse capacitor (C)y2) Is connected to the negative pole of the direct current bus;
the fifth pulse capacitor (C)x5) Is further connected to a first stator coil (Lsa) of the electrical machine;
the third pulse capacitor (C)x3) Is further connected to a second stator coil (Lsb) of the electrical machine;
the first pulse capacitor (C)x1) Is also connected to a third stator coil (Lsc) of the motor.
2. The circuit according to claim 1, characterized in that said seventh pulse capacitance (C)y1) Are respectively connected with a first pulse capacitor (C)x1) First terminal, third pulse capacitor (C)x3) And a fifth pulse capacitor (C)x5) The first end specifically is:
the seventh pulse capacitance (C)y1) Respectively connected to a first non-inductive resistor (R)x1) First terminal, third non-inductive resistor (R)x3) First terminal, fifth non-inductive resistor (R)x5) A first end of (a);
the first non-inductive resistor (R)x1) And the first pulse capacitor (C)x1) Is connected to the first end of the third non-inductive resistor (R)x3) And the third pulse capacitor (C)x3) Is connected to the first end of the fifth non-inductive resistor (R)x5) And the second terminal of (C) and the fifth pulse capacitor (C)x5) Is connected to the first end of the first housing.
3. The circuit according to claim 1, characterized in that said second pulse capacitance (C)x2) The second terminal of (a), the fourth pulse capacitance (C)x4) And the sixth pulse capacitance (C)x6) Are respectively connected to the eighth pulse capacitors (C)y2) The first end specifically is:
the second pulse capacitor (C)x2) And a second non-inductive resistor (R)x2) Is connected with a fourth pulse capacitor (C)x4) Second terminal and fourth non-inductive resistor (R)x4) Is connected to the sixth pulse capacitor (C)x6) Second terminal and sixth non-inductive resistor (R)x6) Is connected with the first end of the first connecting pipe;
said second non-inductive resistance (R)x2) The second terminal, the fourth non-inductive resistor (R)x4) The sixth non-inductive resistor (R)x6) Are respectively connected to the eighth pulse capacitors (C)y2) The first end of (a).
4. The circuit according to claim 1, characterized in that the positive pole of the dc bus is connected to a seventh pulse capacitor (C)y1) The first end specifically is:
the positive pole of the direct current bus passes through a seventh resistor (R)y1) Connected to a seventh pulse capacitor (C)y1) The first end of (a).
5. The circuit according to claim 1, characterized in that said eighth pulse capacitor (C)y2) The second end of the dc bus connected to the negative electrode of the dc bus is specifically:
the eighth pulse capacitor (C)y2) Through an eighth resistor (R)y2) A negative electrode connected to the DC bus.
6. The circuit of claim 1, further comprising:
and a three-phase common mode choke Coil (CM) provided at the periphery of a first connection line between the second terminal of the first switching device and the first stator coil, a second connection line between the second terminal of the third switching device and the second stator coil, and a third connection line between the second terminal of the fifth switching device and the third stator coil.
7. A circuit according to claim 6, characterized in that the three-phase common mode Choke (CM) is a NiZn three-phase common mode choke.
8. A circuit according to claim 6, characterized in that the three-phase common mode Choke (CM) is a nanocrystalline three-phase common mode choke.
9. A vehicle comprising a circuit for reducing common mode current emitted externally by an onboard motor controller as claimed in any one of claims 1 to 8.
10. A driving method applied to the circuit for reducing the common-mode current emitted to the outside by the vehicle-mounted motor controller according to any one of claims 1 to 8, the driving method comprising:
in the first period, the first switching device (S1) and the fourth switching device (S4) are closed, the positive pole of the direct current bus outputs an A alternating current signal to the first end of the first stator coil (Lsa) of the motor through the first switching device (S1), the A alternating current signal flows through the second stator coil (Lsb) of the motor, a first target signal is generated and flows to the negative pole of the direct current bus through the fourth switching device (S4), and a first high-frequency common mode signal is generated and flows through the third pulse capacitor (C4)x3) And a seventh pulse capacitor (C)y1) A first terminal of a DC-to-DC support capacitor (C)And via a fourth pulse capacitor (C)x4) And an eighth pulse capacitor (C)y2) To the second end of the dc support capacitor (C);
in the second period, the third switching device (S3) and the sixth switching device (S6) are closed, the positive pole of the direct current bus outputs a B alternating current signal to the first end of the second stator coil (Lsb) of the motor through the third switching device (S3), the B alternating current signal flows through the third stator coil (Lsc) of the motor, a second target signal is generated and flows to the negative pole of the direct current bus through the sixth switching device (S6), and a second high-frequency common mode signal is generated and flows through the first pulse capacitor (C6)x1) And a seventh pulse capacitor (C)y1) Flows to the first end of the DC support capacitor (C) and passes through the second pulse capacitor (C)x2) And an eighth pulse capacitor (C)y2) To the second end of the dc support capacitor (C);
in a third period, a fifth switching device (S5) and a second switching device (S2) are closed, the positive electrode of the direct current bus outputs a C alternating current signal to the first end of a third stator coil (Lsc) of the motor through the fifth switching device (S5), the C alternating current signal flows through the first stator coil (Lsa) of the motor, a third target signal is generated and flows to the negative electrode of the direct current bus through the second switching device (S2), and a third high-frequency common mode signal is generated and flows through a fifth pulse capacitor (C2)x5) And a seventh pulse capacitor (C)y1) Flows to the first end of the DC support capacitor (C) and passes through the sixth pulse capacitor (C)x6) And an eighth pulse capacitor (C)y2) To the second end of the dc support capacitor (C).
CN202010087993.6A 2020-02-12 2020-02-12 Circuit, driving method thereof and vehicle Pending CN111193388A (en)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010087993.6A CN111193388A (en) 2020-02-12 2020-02-12 Circuit, driving method thereof and vehicle

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113280459A (en) * 2021-05-06 2021-08-20 宁波奥克斯电气股份有限公司 Air conditioner EMC optimizing circuit, air conditioner controller and air conditioner
CN113346736A (en) * 2021-07-07 2021-09-03 珠海拓芯科技有限公司 Inverter circuit and variable frequency air conditioner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113280459A (en) * 2021-05-06 2021-08-20 宁波奥克斯电气股份有限公司 Air conditioner EMC optimizing circuit, air conditioner controller and air conditioner
CN113346736A (en) * 2021-07-07 2021-09-03 珠海拓芯科技有限公司 Inverter circuit and variable frequency air conditioner

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