CN211892861U - Active short circuit and electric automobile - Google Patents
Active short circuit and electric automobile Download PDFInfo
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- CN211892861U CN211892861U CN201922206138.8U CN201922206138U CN211892861U CN 211892861 U CN211892861 U CN 211892861U CN 201922206138 U CN201922206138 U CN 201922206138U CN 211892861 U CN211892861 U CN 211892861U
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Abstract
The utility model discloses an initiative short-circuit and electric automobile, wherein, this initiative short-circuit includes power supply circuit, fall the electric detection circuitry, drive circuit, control circuit and AND gate logic circuit, power supply circuit includes first power and second power, the output of first power and the output of second power are connected with drive circuit's input respectively, fall the sense terminal of electric detection circuitry and be connected with at least one in first power and the second power, fall the output of electric detection circuitry and be connected with AND gate logic circuit's input, and AND gate logic circuit's input is connected with drive circuit's input, AND gate logic circuit output is connected with drive circuit's signal reception end, control circuit's output is connected with drive circuit's control signal reception end, drive circuit's output and bridge arm switch union coupling. The utility model discloses technical scheme promotes electric automobile's reliability.
Description
Technical Field
The utility model relates to a power technical field, in particular to initiative short-circuit and electric automobile.
Background
Usually, the ACTIVE SHORT circuit is a safe state of the electric vehicle, and the ACTIVE SHORT circuit (ACS) is formed by simultaneously switching on three lower bridge arms or three upper bridge arms through a motor controller so as to SHORT-circuit a three-phase stator winding of the motor.
When an electric automobile running at a high speed is in emergency stop, the permanent magnet synchronous motor is switched to a power generation state from an electric state, an uncontrollable rectifying circuit is formed by connecting diodes in parallel in an anti-way in an internal power module of a motor controller, if a low-voltage battery or a high-voltage battery fails at the moment, the motor controller loses the field weakening protection, the voltage of a bus is increased, the bus capacitor and other high-voltage devices are damaged, and the danger is brought to the vehicle running at the high speed.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims at providing an initiative short-circuit and electric automobile aims at promoting electric automobile's reliability.
In order to achieve the above object, the present invention provides an active short circuit applied to a motor controller, the motor controller includes a bridge arm switch tube, the bridge arm switch tube has an upper bridge switch tube and a lower bridge switch tube, the active short circuit includes a power circuit, a power failure detection circuit, a driving circuit, a control circuit and an and gate logic circuit;
the power circuit comprises a first power supply and a second power supply, the output end of the first power supply and the output end of the second power supply are respectively connected with the input end of the driving circuit, the detection end of the power failure detection circuit is connected with at least one of the first power supply and the second power supply, the output end of the power failure detection circuit is connected with the input end of the AND logic circuit, the input end of the AND logic circuit is connected with the input end of the driving circuit, the output end of the AND logic circuit is connected with the signal receiving end of the driving circuit, the output end of the control circuit is connected with the control signal receiving end of the driving circuit, and the output end of the driving circuit is connected with the bridge arm switching tube;
the power failure detection circuit is used for respectively outputting a power failure detection signal to the AND gate logic circuit and a power supply starting signal to the second power supply when the first power supply is detected to be powered down, and respectively outputting a power failure detection signal to the AND gate logic circuit and a power supply starting signal to the first power supply when the second power supply is detected to be powered down;
the AND gate logic circuit is used for outputting and logic signals to control the driving circuit to be in an active short-circuit state when receiving the power failure detection signal output by the power failure detection circuit and the driving voltage signal of the driving circuit are greater than a preset voltage-stabilizing signal;
the control circuit is used for outputting a PWM signal to the drive circuit when the motor controller detects a fault;
and the driving circuit is used for generating an active short circuit driving signal according to the AND logic signal output by the AND logic circuit or the PWM signal output by the control circuit so as to drive the bridge arm switch tube to be actively short-circuited.
Optionally, the power supply circuit further comprises a first power supply circuit, a second power supply circuit and a transformer;
the first power supply and the first power supply circuit are connected to each other and to a first primary winding of the transformer, and the second power supply circuit are connected to each other and to a second primary winding of the transformer.
Optionally, the first power supply circuit includes a first MOS transistor, a first resistor, and a first power management chip;
the first power management chip is provided with a GDRV pin, an ISNS pin, an EN pin and a GND pin, the first end of a first primary winding of the transformer is connected with the anode of a first power supply, the drain electrode of a first MOS tube is connected with the second end of the first primary winding of the transformer, the source electrode of the first MOS tube is connected with the first end of a first resistor, the second end of the first resistor is connected with the drive reference ground of the lower bridge switch tube, the grid electrode of the first MOS tube is connected with the GDRV pin of the first power management chip, the ISNS pin of the first power management chip is connected with the source electrode of the first MOS tube, and the EN pin and the GND pin of the first power management chip are grounded.
Optionally, the second power supply circuit includes a second MOS transistor, a second resistor, a third resistor, and a second power management chip;
the second power management chip has a GDRV pin, an ISNS pin, an EN pin, a VDD pin and a GND pin, a first end of a second primary winding of the transformer is connected with the anode of the second power supply, a drain electrode of the second MOS tube is connected with a second end of the second primary winding of the transformer, the source electrode of the second MOS tube is connected with the first end of the second resistor, the second end of the second resistor is connected with the driving reference ground of the lower bridge switch tube, the grid electrode of the second MOS tube is connected with the GDRV pin of the second power management chip, the ISNS pin of the second power management chip is connected with the source electrode of the second MOS tube, the third resistor is connected between the EN pin and the GND pin of the second power management chip, and the GND pin of the second power management chip is connected with the driving reference ground of the lower bridge switch tube, and the cathode of the second power supply is connected with the driving reference ground of the lower bridge switch tube.
Optionally, the second power supply circuit further includes a fourth resistor, a first capacitor, and a first zener diode;
the first end of the fourth resistor is connected with the positive electrode of the second power supply, the second end of the fourth resistor, the first end of the first capacitor and the common end of the cathode of the first voltage stabilizing diode are connected with the VDD pin of the second power supply management chip and are voltage starting ends of the second power supply management chip, and the second end of the first capacitor and the anode of the first voltage stabilizing diode are connected with the GND pin of the second power supply management chip.
Optionally, the power failure detection circuit includes a fifth resistor, a third MOS transistor, and an isolation optocoupler;
keep apart the opto-coupler and have input positive pole, input negative pole, output and earthing terminal, the first end of fifth resistance with the drive voltage end connection of lower bridge switch tube, the second end of fifth resistance with the drain electrode of third MOS pipe is connected, and does fall the output of electric detection circuitry, the source electrode of third MOS pipe with the earthing terminal of keeping apart the opto-coupler is connected, and with the drive reference ground of lower bridge switch tube is connected, the grid of third MOS pipe with the output of keeping apart the opto-coupler is connected, the input positive pole of keeping apart the opto-coupler with the positive pole of first power is connected, the input negative pole of keeping apart the opto-coupler with the negative pole of first power is connected, the negative pole ground connection of first power.
Optionally, the transformer has a first secondary winding, a second secondary winding, a third secondary winding, a fourth secondary winding, a fifth secondary winding, a sixth secondary winding, a seventh secondary winding, an eighth secondary winding, and a ninth secondary winding;
the upper bridge switching tube is provided with a U-phase reference ground, a V-phase reference ground and a W-phase reference ground;
the first secondary winding comprises a first diode, a second capacitor and a sixth resistor, the anode of the first diode is the first end of the first secondary winding, the common end of the cathode of the first diode, the first end of the second capacitor and the first end of the sixth resistor is connected with a power supply voltage end, and the second end of the second capacitor and the second end of the sixth resistor are both grounded and are the second end of the first secondary winding;
the second secondary winding and the third secondary winding comprise a second diode, a third capacitor, a fourth capacitor, a seventh resistor and an eighth resistor, the anode of the second diode is the first end of the second secondary winding, the cathode of the second diode, the first end of the third capacitor and the first end of the seventh resistor are connected with each other, the cathode of the third diode is the second end of the third secondary winding, the anode of the third diode, the second end of the fourth capacitor and the second end of the eighth resistor are connected with each other, and the second end of the third capacitor, the first end of the fourth capacitor, the second end of the seventh resistor and the first end of the eighth resistor are all connected with a U-phase reference ground;
the fourth secondary winding and the fifth secondary winding comprise a fourth diode, a fifth capacitor, a sixth capacitor, a ninth resistor and a tenth resistor, wherein the anode of the fourth diode is the first end of the fourth secondary winding, the cathode of the fourth diode, the first end of the fifth capacitor and the first end of the ninth resistor are connected with each other, the cathode of the fifth diode is the second end of the fifth secondary winding, the anode of the fifth diode, the second end of the sixth capacitor and the second end of the tenth resistor are connected with each other, and the second end of the fifth capacitor, the first end of the sixth capacitor, the second end of the ninth resistor and the first end of the tenth resistor are all connected with a V-phase reference ground;
the sixth secondary winding and the seventh secondary winding comprise a sixth diode, a seventh capacitor, an eighth capacitor, an eleventh resistor and a twelfth resistor, wherein the anode of the sixth diode is the first end of the sixth secondary winding, the cathode of the sixth diode, the first end of the seventh capacitor and the first end of the eleventh resistor are connected with each other, the cathode of the seventh diode is the second end of the seventh secondary winding, the anode of the seventh diode, the second end of the eighth capacitor and the second end of the twelfth resistor are connected with each other, and the second end of the seventh capacitor, the first end of the eighth capacitor, the second end of the eleventh resistor and the first end of the twelfth resistor are all connected with W phase reference;
the eighth secondary winding and the ninth secondary winding comprise an eighth diode, a ninth diode, a twelfth diode, a ninth capacitor, a tenth capacitor, a thirteenth resistor, and a fourteenth resistor, the anode of the eighth diode is the first end of the eighth secondary winding, the cathode of the eighth diode, the first end of the ninth capacitor, the first end of the thirteenth resistor and the anode of the twelfth diode are all connected to the driving voltage end of the lower bridge switching tube, the cathode of the twelfth diode is a voltage starting end, the cathode of the ninth diode is a second end of the ninth secondary winding, an anode of the ninth diode, a second terminal of the tenth capacitor, and a second terminal of the fourteenth resistor are connected to each other, and the second end of the ninth capacitor, the first end of the tenth capacitor, the second end of the thirteenth resistor and the first end of the fourteenth resistor are all connected with the driving reference ground of the lower bridge switching tube.
Optionally, the first power supply is a low-voltage battery, and the second power supply is a direct-current side film capacitor.
The utility model also provides an electric automobile, electric automobile includes as above initiative short-circuit.
The utility model discloses technical scheme is through including power supply circuit, power down detection circuitry, drive circuit, control circuit and AND gate logic circuit among the initiative short-circuit, including first power and second power in the power supply circuit. When the first power supply fails, the second power supply is started through detection of the power failure detection circuit, the power failure detection signal is output to the AND gate logic circuit, the AND gate logic circuit controls the AND gate logic circuit according to the power failure detection signal and the fact that the driving voltage signal of the driving circuit is larger than a preset voltage stabilization signal, and the AND gate logic circuit outputs an AND logic signal to control the driving circuit to generate an active short circuit driving signal to drive the bridge arm switch tube to be in active short circuit. When the second power supply is detected to be powered down, the power failure detection circuit respectively outputs a power failure detection signal to the AND gate logic circuit and outputs a power supply starting signal to the first power supply, namely when the second power supply fails, the first power supply is started through detection of the power failure detection circuit, the power failure detection signal is output to control the AND gate logic circuit, and the AND gate logic circuit outputs an AND logic signal according to the power failure detection signal and the fact that a driving voltage signal of the driving circuit is larger than a preset voltage stabilization signal, so that the driving circuit is controlled to generate an active short circuit driving signal to drive the bridge arm switch tube to be actively short-circuited. In addition, when the power supply of the whole vehicle is normal, the control circuit directly outputs the PWM signal to the drive circuit when the motor controller detects a fault, namely when the motor controller has a fault at a high speed, the upper bridge switching tube drive signal is selected to be normally high or the lower bridge switching tube drive signal is selected to be normally high according to whether the upper bridge switching tube and the lower bridge switching tube drive the fault. The utility model discloses technical scheme has promoted electric automobile's reliability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of an active short circuit in the related art;
fig. 2 is a schematic structural diagram of an embodiment of the active short circuit of the present invention;
FIG. 3 is a schematic diagram of an embodiment of a power circuit of the active short circuit of FIG. 2;
fig. 4 is a schematic structural diagram of another embodiment of the active short circuit of the present invention;
fig. 5 is a schematic circuit diagram of an embodiment of the active short circuit of the present invention.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "A and/or B" as an example, including either the A aspect, or the B aspect, or both A and B satisfied aspects. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides an initiative short-circuit and electric automobile, this motor controller includes the bridge arm switch tube, the bridge arm switch tube has upper bridge switch tube and lower bridge switch tube, in the correlation technique, as shown in figure 1, upper bridge switch tube includes U looks reference ground, V looks reference ground and W looks reference ground, the lower bridge switch tube is including drive reference ground and driving voltage end, specifically, the U looks reference ground of upper bridge switch tube is GND _ HU promptly, the V looks reference ground of upper bridge switch tube is GND _ HV promptly, the W looks reference ground of upper bridge switch tube is GND _ HW promptly, be the projecting pole of upper bridge switch tube, the drive reference ground of lower bridge switch tube is GND _ LUVW promptly, for the projecting pole of lower bridge switch tube, the driving voltage end of lower bridge switch tube is VL _ UVW promptly. The active short circuit system needs a driving power supply and a control circuit which are powered by low voltage or high voltage to work normally, and a PWM signal is controlled and sent to the driving circuit according to the state of the whole vehicle (such as a fault at a high speed), so that the upper three tubes or the lower three tubes are normally opened, and the active short circuit function is realized. If the low-voltage battery fails, so that the upper three tubes or the lower three tubes are turned off, the active short-circuit function cannot be started. Furthermore, the emergency power supply for taking power at high voltage is started by detecting that the output driving voltage of the driving power supply is lower than a certain threshold value in the related technical scheme, the switching from low voltage to high voltage needs to be realized, and the emergency power supply for taking power at high voltage is started slowly, so that the active short circuit function is slow in response. In the process of towing an electric automobile by a trailer, if active short circuit is required, the driving voltage is gradually increased from 0V, and when the conduction threshold voltage of the power switching tube is reached, the switching tube is switched on under lower driving voltage, so that the switching tube works in a linear region, the loss is large, the switching tube is possibly damaged, and the danger is brought to the vehicle running at high speed.
In order to solve the above problem, in an embodiment of the present invention, as shown in fig. 2 and 4, the active short circuit includes a power circuit, a power failure detection circuit 40, a driving circuit 70, a control circuit 50, and an and logic circuit 60;
the power supply circuit comprises a first power supply 20 and a second power supply 30, an output end of the first power supply 20 and an output end of the second power supply 30 are respectively connected with an input end of the driving circuit 70, a detection end of the power failure detection circuit 40 is connected with at least one of the first power supply 20 and the second power supply 30, an output end of the power failure detection circuit 40 is connected with an input end of the and logic circuit 60, an input end of the and logic circuit 60 is connected with an input end of the driving circuit 70, an output end of the and logic circuit 60 is connected with a signal receiving end of the driving circuit 70, an output end of the control circuit 50 is connected with a control signal receiving end of the driving circuit 70, and an output end of the driving circuit 70 is connected with the bridge arm switching tube 10;
the power-down detection circuit 40 is configured to output a power-down detection signal to the and logic circuit 60 and output a power-down start signal to the second power supply 30 when detecting that the first power supply 20 is powered down, and output a power-down detection signal to the and logic circuit 60 and output a power-down start signal to the first power supply 20 when detecting that the second power supply 30 is powered down;
the and logic circuit 60 is configured to output and logic signals to control the driving circuit 70 to be in an active short-circuit state when receiving the power failure detection signal output by the power failure detection circuit 40 and the driving voltage signal of the driving circuit 70 that are greater than a preset voltage stabilization signal;
the control circuit 50 is configured to output a PWM signal to the driving circuit 70 when the motor controller detects a fault;
the driving circuit 70 is configured to generate an active short circuit driving signal according to the and logic signal output by the and logic circuit 60 or the PWM signal output by the control circuit 50, so as to drive the bridge arm switching tube 10 to actively short circuit.
In this embodiment, to in the trailer pulls electric automobile in-process, lead to the switch tube to work in linear region, the loss is great, probably damages the switch tube, brings dangerous problem for the vehicle of high-speed operation. As shown in fig. 2, according to the present embodiment, through the first power supply 20 and the second power supply 30 connected to the driving circuit 70, when the power failure detection circuit 40 detects that the first power supply 20 is powered down, the second power supply 30 is controlled to start, and simultaneously outputs a power failure detection signal to the and logic circuit 60, when the and logic circuit 60 outputs an and logic signal to the driving circuit 70 according to the power failure detection signal and the driving voltage signal of the driving circuit 70 is greater than a preset voltage stabilization signal, and when the driving circuit 70 receives the and logic signal of the and logic circuit 60, the driving circuit 70 controls the bridge arm switch 10 to be actively short-circuited.
It should be noted that, as shown in fig. 2 and fig. 4, a zener diode is connected between the input end of the and logic circuit 60 and the input end of the driving circuit 70, the driving voltage signal of the driving circuit 70 is output to the and logic circuit 60 through the zener diode, the zener diode has a regulated voltage value, when the driving voltage of the driving circuit 70 is greater than the regulated voltage value of the zener diode, the and logic circuit 60 receives a driving voltage signal, and the and logic circuit 60 controls the and logic circuit 60 to output an and logic signal to the driving circuit 70 according to the power-down detection signal and the driving voltage signal. It can be understood that the reverse voltage stabilization value of the voltage stabilizing diode can ensure that the power switch tube cannot be turned on at a lower driving voltage and damaged. Under normal conditions, the voltage stabilizing diode is always in a conducting state, and the active short circuit function can be quickly responded when the low voltage fails. The reverse voltage regulation value of the zener diode can be 9V, 10V, 11V, etc., and is set according to practical situations, and is not limited here. The preset voltage stabilizing signal is the voltage stabilizing signal of the voltage stabilizing diode. If the first power supply 20 or the second power supply 30 is not powered down or the driving voltage signal of the driving circuit is less than the preset voltage-stabilizing signal, the active short circuit of the electric vehicle is not started.
In one embodiment, as shown in fig. 4, in the present embodiment, through the first power supply 20 and the second power supply 30 connected to the driving circuit 70, when the power failure detection circuit 40 detects that the second power supply 30 is powered down, the first power supply 20 is controlled to start up, and at the same time, a power failure detection signal is output to the and logic circuit 60, the and logic circuit 60 outputs an and logic signal to the driving circuit 70 according to the power failure detection signal and the driving voltage signal, and when the driving circuit 70 receives the and logic signal of the and logic circuit 60, the bridge arm switch 10 is controlled to short-circuit.
Here, the and logic signal output by the and logic circuit 60 is a high level signal, that is, the and logic circuit 60 outputs a high level signal to the driving circuit 70 to drive the active short circuit of the bridge arm switch tube 10 of the motor controller. When the first power supply 20 or the second power supply 30 is not powered down, the control circuit 50 in this embodiment may also detect a fault through the motor controller, and when the control circuit 50 receives a fault signal, directly control and output a PWM signal to the driving circuit 70, that is, when the motor controller fails at a high speed, according to whether the upper bridge switching tube and the lower bridge switching tube in the bridge arm switching tubes are driven to fail, the upper bridge switching tube driving signal is selected to be normally high or the lower bridge switching tube driving signal is selected to be normally high, so as to drive the short circuit of the bridge arm switching tube 10 of the motor controller.
Based on the above embodiment, the first power source 20 is a low voltage battery, and the second power source 30 is a dc-side film capacitor. It can be understood that when the power-down detection circuit 40 detects that the first power supply 20 is powered down, the power-down detection circuit 40 controls to output a power supply start signal to the second power supply 30, that is, the low-voltage battery is powered down, and the power-down detection circuit 40 outputs a high-voltage start signal to control the direct-current side membrane capacitor to output a power supply voltage to start the post-stage circuit. When the power failure detection circuit 40 detects that the second power supply 30 is powered down, the power failure detection circuit 40 controls to output a power supply starting signal to the first power supply 20, namely, the power failure of the direct-current side film capacitor, and the power failure detection circuit 40 outputs a low-voltage starting signal to control the low-voltage battery to output power supply voltage to start a post-stage circuit.
In one embodiment, as shown in fig. 3, the power circuit further includes a first power circuit 80, a second power circuit 90, and a transformer T;
the first power source 20 and the first power circuit 80 are connected to each other and to a first primary winding of the transformer T, and the second power source 30 and the second power circuit 90 are connected to each other and to a second primary winding of the transformer T.
It is understood that the output terminal of the low voltage battery is connected to the input terminal of the first power circuit 80, the output terminal of the first power circuit 80 is connected to the first primary winding of the transformer T, the output terminal of the dc-side film capacitor is connected to the input terminal of the second power circuit 90, the output terminal of the second power circuit 90 is connected to the second primary winding of the transformer T, and the secondary winding of the transformer T is the output terminal of the power circuit, i.e., is connected to the driving circuit 70, and outputs the driving voltage to the driving circuit 70 through the secondary winding of the transformer T.
A rectifier circuit may be provided between the transformer T and the drive circuit 70, and the rectifier circuit may rectify the power supply voltage output from the transformer T to output the rectified power supply voltage to the drive circuit.
Furthermore, when the low-voltage battery fails, the active short circuit function can be realized by controlling the starting of the power supply voltage input by the direct-current side membrane capacitor, so that the safety of the electric automobile is improved. Specifically, when the low-voltage battery is normal, the second power circuit 90 that takes power from the dc-side film capacitor does not operate, the first power circuit 80 operates normally to provide a driving voltage for the driving circuit 70, and the control circuit 50 sends a high-level signal to the driving circuit 70 according to the state of the electric vehicle (for example, a failure of the entire vehicle occurs at a high speed), so that the driving circuit 70 enters an active short-circuit state, that is, the bridge arm switching tube 10 of the motor controller in the electric vehicle is controlled to be normally opened in an upper three-tube or a lower three-tube state. When the low-voltage battery fails, the low-voltage power failure detection circuit 40 detects that the low-voltage battery fails, and sends a high-voltage power supply starting signal to the second power supply circuit 90, so that the power supply powered by the direct-current side membrane capacitor works to provide driving voltage for the driving circuit 70, and simultaneously sends a power failure detection signal to the and logic circuit 60, and controls the and logic circuit 60 to output an and logic signal to the driving circuit 70, and active short circuit is realized.
The utility model discloses technical scheme is through including power supply circuit, power down detection circuitry 40, drive circuit 70, control circuit 50 and AND gate logic circuit 60 in the initiative short-circuit, including first power 20 and second power 30 in the power supply circuit. When the power failure detection circuit 40 detects that the first power supply 20 is powered down, it outputs a power failure detection signal to the and logic circuit 60 and outputs a power supply start signal to the second power supply 30, that is, when the first power supply 20 fails, the second power supply 30 is started through detection of the power failure detection circuit 40, and outputs a power failure detection signal to control the and logic circuit 60, and when the and logic circuit 60 outputs an and logic signal according to the power failure detection signal and the driving voltage signal of the driving circuit 70 is greater than a preset voltage stabilization signal, the and logic circuit controls the driving circuit 70 to generate an active short circuit driving signal to drive the bridge arm switching tube 10 to be actively short-circuited. When the power failure detection circuit 40 detects that the second power supply 30 is powered down, it outputs a power failure detection signal to the and logic circuit 60 and outputs a power supply start signal to the first power supply 20, that is, when the second power supply 30 fails, the first power supply 20 is started through detection of the power failure detection circuit 40, and outputs a power failure detection signal to control the and logic circuit 60, and when the and logic circuit 60 outputs an and logic signal according to the power failure detection signal and the driving voltage signal of the driving circuit 70 is greater than a preset voltage stabilization signal, so as to control the driving circuit 70 to generate an active short circuit driving signal to drive the bridge arm switching tube 10 to be actively short-circuited. In addition, when the power supply of the whole vehicle is normal, the control circuit 50 directly outputs the PWM signal to the driving circuit 70 when the motor controller detects a fault, that is, when the motor controller has a fault at a high speed, the upper bridge switching tube or the lower bridge switching tube is selected to have a high driving signal according to whether the upper bridge switching tube and the lower bridge switching tube have a fault during driving. The utility model discloses technical scheme has promoted electric automobile's reliability.
In one embodiment, as shown in fig. 5, the first power circuit 80 includes a first MOS transistor Q1, a first resistor R1, and a first power management chip U1;
the first power management chip U1 has a GDRV pin, an ISNS pin, an EN pin, and a GND pin, the first end of the first primary winding of the transformer T is connected to the positive electrode of the first power source 20, the drain of the first MOS transistor Q1 is connected to the second end of the first primary winding of the transformer T, the source of the first MOS transistor Q1 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the driving reference ground of the lower bridge switching tube, the gate of the first MOS transistor Q1 is connected to the GDRV pin of the first power management chip U1, the ISNS pin of the first power management chip U1 is connected to the source of the first MOS transistor Q1, and the EN pin and the GND pin of the first power management chip U1 are both grounded.
In this embodiment, the first power circuit 80 controls the first power 20 to output voltage to the transformer T, and the transformer T transforms the voltage to output driving voltage to the driving circuit 70 for the driving circuit 70 to operate. Note that the model of the first power management chip U1 may be the TPS 40210.
In one embodiment, as shown in fig. 5, the second power circuit 90 includes a second MOS transistor Q2, a second resistor R2, a third resistor R3, and a second power management chip U2;
the second power management chip U2 has a GDRV pin, an ISNS pin, an EN pin, a VDD pin, and a GND pin, a first end of the second primary winding of the transformer T is connected to the positive electrode of the second power supply 30, a drain of the second MOS transistor Q2 is connected to a second end of the second primary winding of the transformer T, a source of the second MOS transistor Q2 is connected to a first end of the second resistor R2, a second end of the second resistor R2 is connected to the driving reference ground of the lower bridge switching transistor, a gate of the second MOS transistor Q2 is connected to the GDRV pin of the second power management chip U2, the ISNS pin of the second power management chip U2 is connected to the source of the second MOS transistor Q2, the third resistor R3 is connected between the EN pin and the GND pin of the second power management chip U2, and the GND pin of the second power management chip U2 is connected to the driving reference ground of the lower bridge switching transistor, the negative electrode of the second power supply 30 is connected to the driving reference ground of the lower bridge switching tube.
In this embodiment, the second power circuit 90 further includes a fourth resistor R4, a first capacitor C1, and a first zener diode Z1;
a first end of the fourth resistor R4 is connected to the positive electrode of the second power supply 30, a second end of the fourth resistor R4, a first end of the first capacitor C1, and a common end of the cathode of the first zener diode Z1 are connected to a VDD pin of the second power management chip U2, and are voltage-enabled ends of the second power management chip U2, and a second end of the first capacitor C1 and an anode of the first zener diode Z1 are both connected to a GND pin of the second power management chip U2.
In this embodiment, the second power circuit 90 controls the second power supply 30 to output voltage to the transformer T, and the transformer T transforms the voltage to output driving voltage to the driving circuit 70 for the driving circuit 70 to work. Note that the model of the second power management chip U2 may be the TPS 40210.
In an embodiment, as shown in fig. 5, the power down detection circuit 40 includes a fifth resistor R5, a third MOS transistor Q3, and an isolation optocoupler U3;
isolation opto-coupler U3 has input anode, input cathode, output and earthing terminal, fifth resistance R5 first end with the drive voltage end of lower bridge switch tube is connected, fifth resistance R5 second end with third MOS pipe Q3's drain electrode is connected, and does fall the output of electric detection circuit 40, third MOS pipe Q3's source electrode with isolation opto-coupler U3's earthing terminal is connected, and with lower bridge switch tube's drive is referenced ground and is connected, third MOS pipe Q3's grid with isolation opto-coupler U3's output is connected, isolation opto-coupler U3's input anode with first power supply 20's positive pole is connected, isolation opto-coupler U3's input cathode with first power supply 20's negative pole is connected, first power supply 20's negative pole ground connection. It should be noted that the isolating optocoupler U3 may be of the type HCPL-181.
In this embodiment, the power-down detection circuit 40 may detect whether the first power supply 20 is powered down, control to output a power supply start signal to start the second power supply 30, and output a power-down detection signal to the and logic circuit 60, where the and logic circuit 60 outputs an and logic signal according to the power-down detection signal and the condition that the driving voltage signal of the driving circuit 70 is greater than the preset voltage-stabilizing signal, and controls the driving circuit 70 to drive the active short circuit of the bridge arm switching tube 10 of the motor controller.
In one embodiment, as shown in fig. 5, the transformer T has a first secondary winding, a second secondary winding, a third secondary winding, a fourth secondary winding, a fifth secondary winding, a sixth secondary winding, a seventh secondary winding, an eighth secondary winding and a ninth secondary winding;
the upper bridge switching tube is provided with a U-phase reference ground, a V-phase reference ground and a W-phase reference ground;
the first secondary winding comprises a first diode D1, a second capacitor C2 and a sixth resistor R6, the anode of the first diode D1 is the first end of the first secondary winding, the common end of the cathode of the first diode D1, the first end of the second capacitor C2 and the first end of the sixth resistor R6 is connected with a power supply voltage end, and the second end of the second capacitor C2 and the second end of the sixth resistor R6 are both grounded and are the second end of the first secondary winding;
the second secondary winding and the third secondary winding comprise a second diode D2, a third diode D3, a third capacitor C3, a fourth capacitor C4, a seventh resistor R7 and an eighth resistor R8, the anode of the second diode D2 is the first end of the second secondary winding, the cathode of the second diode D2, the first end of the third capacitor C3 and the first end of the seventh resistor R7 are connected with each other, the cathode of the third diode D3 is the second end of the third secondary winding, the anode of the third diode D3, the second end of the fourth capacitor C4 and the second end of the eighth resistor R8 are connected with each other, the second end of the third capacitor C3, the first end of the fourth capacitor C4, the second end of the seventh resistor R7 and the first end of the eighth resistor R8 are all connected with a U-phase reference ground;
the fourth secondary winding and the fifth secondary winding comprise a fourth diode D4, a fifth diode D5, a fifth capacitor C5, a sixth capacitor C6, a ninth resistor R9 and a tenth resistor R10, an anode of the fourth diode D4 is a first end of the fourth secondary winding, a cathode of the fourth diode D4, a first end of the fifth capacitor C5 and a first end of the ninth resistor R9 are connected to each other, a cathode of the fifth diode D5 is a second end of the fifth secondary winding, an anode of the fifth diode D5, a second end of the sixth capacitor C6 and a second end of the tenth resistor R10 are connected to each other, and a second end of the fifth capacitor C5, a first end of the sixth capacitor C6, a second end of the ninth resistor R9 and a first end of the tenth resistor R10 are all connected to V-phase reference ground;
the sixth secondary winding and the seventh secondary winding comprise a sixth diode D6, a seventh diode D7, a seventh capacitor C7, an eighth capacitor C8, an eleventh resistor R11 and a twelfth resistor R12, the anode of the sixth diode D6 is the first end of the sixth secondary winding, the cathode of the sixth diode D6, the first end of the seventh capacitor C7 and the first end of the eleventh resistor R11 are connected to each other, the cathode of the seventh diode D7 is the second end of the seventh secondary winding, the anode of the seventh diode D7, the second end of the eighth capacitor C8 and the second end of the twelfth resistor R12 are connected to each other, the second end of the seventh capacitor C7, the first end of the eighth capacitor C8, the second end of the eleventh resistor R11 and the first end of the twelfth resistor R12 are all connected to W-reference ground;
the eighth secondary winding and the ninth secondary winding include an eighth diode D8, a ninth diode D9, a twelfth diode D10, a ninth capacitor C9, a tenth capacitor C10, a thirteenth resistor R13 and a fourteenth resistor R14, an anode of the eighth diode D8 is a first end of the eighth secondary winding, a cathode of the eighth diode D8, a first end of the ninth capacitor C9, a first end of the thirteenth resistor R13 and an anode of the twelfth diode D10 are all connected to a driving voltage end of the lower bridge switching tube, a cathode of the twelfth diode D10 is a voltage start end, a cathode of the ninth diode D9 is a second end of the ninth secondary winding, an anode of the ninth diode D9, a second end of the tenth capacitor C10 and a second end of the fourteenth resistor R14 are connected to each other, a second end of the ninth capacitor C9 and a second end of the tenth capacitor C10 are connected to each other, The second end of the thirteenth resistor R13 and the first end of the fourteenth resistor R14 are both connected with the driving reference ground of the lower bridge switching tube.
Based on the above embodiment, that is, the active short circuit has a transformer T with two primary windings N1 and N2, when the primary winding N1 operates, electricity can be taken from the low-voltage battery, so that the secondary windings N3-N11 output the required driving voltage; when the primary winding N2 works, electricity is taken from a direct current side film capacitor of the motor controller, so that the secondary windings N3-N11 output required driving voltage. During normal work, the low voltage battery has the electricity, the power of first power management chip U1 control normally works, it has the electricity to keep apart opto-coupler U3 simultaneously and detects the voltage battery, its output Vo pin output high level signal is to second power management chip U2's enable pin, make the power that second power management chip U2 controlled out of work, and keep apart the power failure detection signal of opto-coupler U3 secondary side and be the low level, do not start the initiative short circuit function. When the low-voltage battery is invalid, the power supply of the first power management chip U1 is lost, the power supply controlled by the first power management chip U1 stops working, the isolation optocoupler U3 detects that the low-voltage battery is powered down, the output Vo pin of the isolation optocoupler outputs low level to enable the second power management chip U2, the power supply controlled by the second power management chip U2 starts working, meanwhile, a power-down detection signal is pulled up to high level, and an active short-circuit function is started.
As shown in fig. 5, the transformer T secondary winding N3 outputs the rectified voltage VCC for the motor controller control system to partially take power, so that at high speed, the dc side film capacitor is always powered, and the control system can still work normally and the motor controller status can be monitored regardless of whether low voltage or high voltage is lost.
Based on the above embodiments, as shown in fig. 5, in this scheme, a suitable fourth resistor R4 may be provided, so that the second power management chip U2 can meet the chip normal operation quiescent current IQ only when the voltage at the dc side film capacitor terminal is above a certain amplitude, and the second power management chip U2 can operate normally. When the electric automobile slides and the low-voltage battery and the high-voltage battery are invalid at the same time, the motor is in a feedback braking state, when the sliding speed reaches a certain value, the bus voltage reaches a certain voltage, the start quiescent current IQ of the second power management chip U2 is met, and the active short-circuit function can be realized to safely stop the automobile. When electric automobile is in the trailer and drags the state, when the trailer speed was too fast, lead to bus voltage to rise to a definite value and start second power management chip U2, the first zener diode Z1 is switched on in the rise of output drive voltage simultaneously, and the initiative short circuit function can be realized, has guaranteed motor controller safety. It is understood that the magnitude of the voltage at the dc-side film capacitor terminal may be 200V, 220V, 380V, etc., and is set according to practical situations, and is not limited herein.
The utility model also provides an electric automobile, electric automobile includes the initiative short-circuit as above, the initiative short-circuit includes power supply circuit, power down detection circuit 40, drive circuit 70, control circuit 50 and AND gate logic circuit 60;
the power supply circuit comprises a first power supply 20 and a second power supply 30, an output end of the first power supply 20 and an output end of the second power supply 30 are respectively connected with an input end of the driving circuit 70, a detection end of the power failure detection circuit 40 is connected with at least one of the first power supply 20 and the second power supply 30, an output end of the power failure detection circuit 40 is connected with an input end of the and logic circuit 60, an input end of the and logic circuit 60 is connected with an input end of the driving circuit 70, an output end of the and logic circuit 60 is connected with a signal receiving end of the driving circuit 70, an output end of the control circuit 50 is connected with a control signal receiving end of the driving circuit 70, and an output end of the driving circuit 70 is connected with the bridge arm switching tube 10;
the power-down detection circuit 40 is configured to output a power-down detection signal to the and logic circuit 60 and output a power-down start signal to the second power supply 30 when detecting that the first power supply 20 is powered down, and output a power-down detection signal to the and logic circuit 60 and output a power-down start signal to the first power supply 20 when detecting that the second power supply 30 is powered down;
the and logic circuit 60 is configured to output and logic signals to control the driving circuit 70 to be in an active short-circuit state when receiving the power failure detection signal output by the power failure detection circuit 40 and the driving voltage signal of the driving circuit 70 that are greater than a preset voltage stabilization signal;
the control circuit 50 is configured to output a PWM signal to the driving circuit 70 when the motor controller detects a fault;
the driving circuit 70 is configured to generate an active short circuit driving signal according to the and logic signal output by the and logic circuit 60 or the PWM signal output by the control circuit 50, so as to drive the bridge arm switching tube 10 to actively short circuit.
The specific structure of the electric vehicle refers to the above embodiments, and since the electric vehicle adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.
The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims (9)
1. An active short circuit is applied to a motor controller, the motor controller comprises a bridge arm switch tube, the bridge arm switch tube is provided with an upper bridge switch tube and a lower bridge switch tube, and the active short circuit is characterized by comprising a power supply circuit, a power failure detection circuit, a driving circuit, a control circuit and an AND gate logic circuit;
the power circuit comprises a first power supply and a second power supply, the output end of the first power supply and the output end of the second power supply are respectively connected with the input end of the driving circuit, the detection end of the power failure detection circuit is connected with at least one of the first power supply and the second power supply, the output end of the power failure detection circuit is connected with the input end of the AND logic circuit, the input end of the AND logic circuit is connected with the input end of the driving circuit, the output end of the AND logic circuit is connected with the signal receiving end of the driving circuit, the output end of the control circuit is connected with the control signal receiving end of the driving circuit, and the output end of the driving circuit is connected with the bridge arm switching tube;
the power failure detection circuit is used for respectively outputting a power failure detection signal to the AND gate logic circuit and a power supply starting signal to the second power supply when the first power supply is detected to be powered down, and respectively outputting a power failure detection signal to the AND gate logic circuit and a power supply starting signal to the first power supply when the second power supply is detected to be powered down;
the AND gate logic circuit is used for outputting and logic signals to control the driving circuit to be in an active short-circuit state when receiving the power failure detection signal output by the power failure detection circuit and the driving voltage signal of the driving circuit are greater than a preset voltage-stabilizing signal;
the control circuit is used for outputting a PWM signal to the drive circuit when the motor controller detects a fault;
and the driving circuit is used for generating an active short circuit driving signal according to the AND logic signal output by the AND logic circuit or the PWM signal output by the control circuit so as to drive the bridge arm switch tube to be actively short-circuited.
2. The active shorting circuit of claim 1, wherein the power circuit further comprises a first power circuit, a second power circuit, and a transformer;
the first power supply and the first power supply circuit are connected to each other and to a first primary winding of the transformer, and the second power supply circuit are connected to each other and to a second primary winding of the transformer.
3. The active short circuit of claim 2, wherein the first power circuit comprises a first MOS transistor, a first resistor, and a first power management chip;
the first power management chip is provided with a GDRV pin, an ISNS pin, an EN pin and a GND pin, the first end of a first primary winding of the transformer is connected with the anode of a first power supply, the drain electrode of a first MOS tube is connected with the second end of the first primary winding of the transformer, the source electrode of the first MOS tube is connected with the first end of a first resistor, the second end of the first resistor is connected with the drive reference ground of the lower bridge switch tube, the grid electrode of the first MOS tube is connected with the GDRV pin of the first power management chip, the ISNS pin of the first power management chip is connected with the source electrode of the first MOS tube, and the EN pin and the GND pin of the first power management chip are grounded.
4. The active short circuit of claim 2, wherein the second power circuit comprises a second MOS transistor, a second resistor, a third resistor, and a second power management chip;
the second power management chip has a GDRV pin, an ISNS pin, an EN pin, a VDD pin and a GND pin, a first end of a second primary winding of the transformer is connected with the anode of the second power supply, a drain electrode of the second MOS tube is connected with a second end of the second primary winding of the transformer, the source electrode of the second MOS tube is connected with the first end of the second resistor, the second end of the second resistor is connected with the driving reference ground of the lower bridge switch tube, the grid electrode of the second MOS tube is connected with the GDRV pin of the second power management chip, the ISNS pin of the second power management chip is connected with the source electrode of the second MOS tube, the third resistor is connected between the EN pin and the GND pin of the second power management chip, and the GND pin of the second power management chip is connected with the driving reference ground of the lower bridge switch tube, and the cathode of the second power supply is connected with the driving reference ground of the lower bridge switch tube.
5. The active short circuit of claim 4, wherein the second power supply circuit further comprises a fourth resistor, a first capacitor, and a first zener diode;
the first end of the fourth resistor is connected with the positive electrode of the second power supply, the second end of the fourth resistor, the first end of the first capacitor and the common end of the cathode of the first voltage stabilizing diode are connected with the VDD pin of the second power supply management chip and are voltage starting ends of the second power supply management chip, and the second end of the first capacitor and the anode of the first voltage stabilizing diode are connected with the GND pin of the second power supply management chip.
6. The active short circuit of claim 1, wherein the power down detection circuit comprises a fifth resistor, a third MOS transistor, and an isolation optocoupler;
keep apart the opto-coupler and have input positive pole, input negative pole, output and earthing terminal, the first end of fifth resistance with the drive voltage end connection of lower bridge switch tube, the second end of fifth resistance with the drain electrode of third MOS pipe is connected, and does fall the output of electric detection circuitry, the source electrode of third MOS pipe with the earthing terminal of keeping apart the opto-coupler is connected, and with the drive reference ground of lower bridge switch tube is connected, the grid of third MOS pipe with the output of keeping apart the opto-coupler is connected, the input positive pole of keeping apart the opto-coupler with the positive pole of first power is connected, the input negative pole of keeping apart the opto-coupler with the negative pole of first power is connected, the negative pole ground connection of first power.
7. The active short circuit of claim 1, wherein the transformer has a first secondary winding, a second secondary winding, a third secondary winding, a fourth secondary winding, a fifth secondary winding, a sixth secondary winding, a seventh secondary winding, an eighth secondary winding, and a ninth secondary winding;
the upper bridge switching tube is provided with a U-phase reference ground, a V-phase reference ground and a W-phase reference ground;
the first secondary winding comprises a first diode, a second capacitor and a sixth resistor, the anode of the first diode is the first end of the first secondary winding, the common end of the cathode of the first diode, the first end of the second capacitor and the first end of the sixth resistor is connected with a power supply voltage end, and the second end of the second capacitor and the second end of the sixth resistor are both grounded and are the second end of the first secondary winding;
the second secondary winding and the third secondary winding comprise a second diode, a third capacitor, a fourth capacitor, a seventh resistor and an eighth resistor, the anode of the second diode is the first end of the second secondary winding, the cathode of the second diode, the first end of the third capacitor and the first end of the seventh resistor are connected with each other, the cathode of the third diode is the second end of the third secondary winding, the anode of the third diode, the second end of the fourth capacitor and the second end of the eighth resistor are connected with each other, and the second end of the third capacitor, the first end of the fourth capacitor, the second end of the seventh resistor and the first end of the eighth resistor are all connected with a U-phase reference ground;
the fourth secondary winding and the fifth secondary winding comprise a fourth diode, a fifth capacitor, a sixth capacitor, a ninth resistor and a tenth resistor, wherein the anode of the fourth diode is the first end of the fourth secondary winding, the cathode of the fourth diode, the first end of the fifth capacitor and the first end of the ninth resistor are connected with each other, the cathode of the fifth diode is the second end of the fifth secondary winding, the anode of the fifth diode, the second end of the sixth capacitor and the second end of the tenth resistor are connected with each other, and the second end of the fifth capacitor, the first end of the sixth capacitor, the second end of the ninth resistor and the first end of the tenth resistor are all connected with a V-phase reference ground;
the sixth secondary winding and the seventh secondary winding comprise a sixth diode, a seventh capacitor, an eighth capacitor, an eleventh resistor and a twelfth resistor, wherein the anode of the sixth diode is the first end of the sixth secondary winding, the cathode of the sixth diode, the first end of the seventh capacitor and the first end of the eleventh resistor are connected with each other, the cathode of the seventh diode is the second end of the seventh secondary winding, the anode of the seventh diode, the second end of the eighth capacitor and the second end of the twelfth resistor are connected with each other, and the second end of the seventh capacitor, the first end of the eighth capacitor, the second end of the eleventh resistor and the first end of the twelfth resistor are all connected with W phase reference;
the eighth secondary winding and the ninth secondary winding comprise an eighth diode, a ninth diode, a twelfth diode, a ninth capacitor, a tenth capacitor, a thirteenth resistor, and a fourteenth resistor, the anode of the eighth diode is the first end of the eighth secondary winding, the cathode of the eighth diode, the first end of the ninth capacitor, the first end of the thirteenth resistor and the anode of the twelfth diode are all connected to the driving voltage end of the lower bridge switching tube, the cathode of the twelfth diode is a voltage starting end, the cathode of the ninth diode is a second end of the ninth secondary winding, an anode of the ninth diode, a second terminal of the tenth capacitor, and a second terminal of the fourteenth resistor are connected to each other, and the second end of the ninth capacitor, the first end of the tenth capacitor, the second end of the thirteenth resistor and the first end of the fourteenth resistor are all connected with the driving reference ground of the lower bridge switching tube.
8. The active shorting circuit according to any one of claims 1 to 7, wherein the first power source is a low voltage battery and the second power source is a dc side membrane capacitor.
9. An electric vehicle, characterized in that it comprises an active short circuit according to any one of claims 1 to 8.
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| CN201922206138.8U CN211892861U (en) | 2019-12-10 | 2019-12-10 | Active short circuit and electric automobile |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112693410A (en) * | 2021-02-02 | 2021-04-23 | 成都金洹科科技有限公司 | Control circuit of motor vehicle controller |
| CN113479065A (en) * | 2021-07-29 | 2021-10-08 | 中国第一汽车股份有限公司 | Motor active short circuit control circuit and driving method thereof |
| CN114312343A (en) * | 2021-01-14 | 2022-04-12 | 华为数字能源技术有限公司 | Motor control system and automobile |
-
2019
- 2019-12-10 CN CN201922206138.8U patent/CN211892861U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114312343A (en) * | 2021-01-14 | 2022-04-12 | 华为数字能源技术有限公司 | Motor control system and automobile |
| US11813942B2 (en) | 2021-01-14 | 2023-11-14 | Huawei Digital Power Technologies Co., Ltd. | Motor control system and vehicle |
| CN112693410A (en) * | 2021-02-02 | 2021-04-23 | 成都金洹科科技有限公司 | Control circuit of motor vehicle controller |
| CN112693410B (en) * | 2021-02-02 | 2023-07-04 | 成都金洹科科技有限公司 | Control circuit of motor vehicle controller |
| CN113479065A (en) * | 2021-07-29 | 2021-10-08 | 中国第一汽车股份有限公司 | Motor active short circuit control circuit and driving method thereof |
| CN113479065B (en) * | 2021-07-29 | 2023-01-10 | 中国第一汽车股份有限公司 | Motor active short circuit control circuit and driving method thereof |
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