CN-122026280-A - Active short-circuit protection circuit, EMB system, EPS system and protection method for vehicle

CN122026280ACN 122026280 ACN122026280 ACN 122026280ACN-122026280-A

Abstract

The invention discloses an active short-circuit protection circuit, an EMB system, an EPS system and a protection method for a vehicle. The active short-circuit protection circuit for the automobile is applied to a main circuit comprising a battery, an inverter, a gate driving module for driving the inverter and a motor, and comprises a PWM output switch module, a short-circuit protection switch module and a short-circuit protection power supply module, wherein the PWM output switch module is connected between the output end of the gate driving module and the control end of each lower bridge arm switching tube of the inverter in series, the short-circuit protection switch module and the short-circuit protection power supply module are powered by the battery and are converted into voltages matched with each lower bridge arm switching tube, the short-circuit protection switch module is connected between the short-circuit protection power supply module and the control end of each lower bridge arm switching tube in series, and the short-circuit protection switch module is conducted when the voltage of the battery exceeds a set threshold value, and controls each lower bridge arm switching tube to be conducted so as to enable each stator winding of the motor to be coupled. The embodiment of the invention realizes the effective removal of faults in the circuit.

Inventors

LV YAN
YANG FEI
XU HAIFENG

Assignees

耐世特汽车系统（苏州）有限公司

Dates

Publication Date: 20260512
Application Date: 20241111

Claims (10)

1. The active short-circuit protection circuit for the vehicle is characterized by being applied to a main circuit comprising a battery, an inverter, a gate driving module for driving the inverter and a motor, and comprises: the PWM output switch module is connected in series between the output end of the gate driving module and the control end of each lower bridge arm switch tube of the inverter; The short-circuit protection switch module is connected in series between the short-circuit protection power supply module and the control end of each lower bridge arm switching tube, and is conducted when the voltage of the battery exceeds a set threshold value, and the conduction of each lower bridge arm switching tube is controlled so as to couple each stator winding of the motor; wherein the PWM output switch module and the short-circuit protection switch module are not conducted simultaneously.
2. The active short-circuit protection circuit for vehicles according to claim 1, wherein the motor is a three-phase motor, and the inverter includes a first lower leg switching tube, a second lower leg switching tube, and a third lower leg switching tube; the PWM output switch module comprises a first PWM output switch, a second PWM output switch and a third PWM output switch, wherein the first PWM output switch is connected in series between a first lower bridge arm control output end of the gate driving module and a control end of the first lower bridge arm switch tube, the second PWM output switch is connected in series between a second lower bridge arm control output end of the gate driving module and a control end of the second lower bridge arm switch tube, and the third PWM output switch is connected in series between a third lower bridge arm control output end of the gate driving module and a control end of the third lower bridge arm switch tube; And/or the short-circuit protection switch module comprises a first short-circuit protection switch, a second short-circuit protection switch and a third short-circuit protection switch, wherein the first short-circuit protection switch is connected in series between the short-circuit protection power supply module and the control end of the first lower bridge arm switch tube, the second short-circuit protection switch is connected in series between the short-circuit protection power supply module and the control end of the second lower bridge arm switch tube, and the third short-circuit protection switch is connected in series between the short-circuit protection power supply module and the control end of the third lower bridge arm switch tube.
3. The active short-circuit protection circuit for a vehicle according to claim 1, further comprising: the short-circuit protection enabling module outputs a PWM output disabling signal and a short-circuit switch enabling signal according to the short-circuit enabling signal; The PWM output disabling module is connected between the short-circuit protection enabling module and the PWM output switching module and is used for generating a control signal for controlling the PWM output switching module to be disconnected according to the PWM output disabling signal; The short-circuit protection output enabling module is connected between the short-circuit protection enabling module and the short-circuit protection switch module and is used for generating a control signal for controlling the conduction of the short-circuit protection switch module according to the short-circuit switch enabling signal.
4. The active short-circuit protection circuit for a vehicle according to claim 3, further comprising: the voltage acquisition module is coupled with the battery and is used for acquiring the positive voltage of the battery; The main control module is connected between the voltage acquisition module and the short-circuit protection enabling module and is used for outputting the short-circuit enabling signal when the acquired positive voltage exceeds the set threshold value.
5. The active short-circuit protection circuit for a vehicle according to claim 3, further comprising: the circuit state monitoring module is coupled with the short-circuit protection enabling module and the PWM output disabling module, and is used for monitoring working states of the short-circuit protection enabling module and the PWM output disabling module and feeding back to the main control module.
6. The active short-circuit protection circuit for vehicles according to claim 1, wherein the output end of the gate driving module is directly coupled with each upper bridge arm switching tube of the inverter; the PWM output disabling module is further coupled to the gate driving module and is configured to control each upper bridge arm switching tube to be disconnected according to the PWM output disabling signal.
7. The active short-circuit protection circuit for a vehicle according to claim 1, further comprising: The phase pole output state monitoring module is coupled with the stator winding of the motor and is used for monitoring the voltage of the stator winding of the motor and feeding back the voltage to the main control module.
8. An EMB system comprising a main circuit and an active short-circuit protection circuit for a vehicle according to any one of claims 1-7.
9. An EPS system comprising a main circuit and the active short-circuit protection circuit for a vehicle according to any one of claims 1 to 7.
10. An active short-circuit protection method for a vehicle, which is applied to the active short-circuit protection circuit for a vehicle according to any one of claims 1 to 7, comprises the following steps: Acquiring the positive voltage of a battery; and if the positive voltage of the battery exceeds a set threshold value, controlling each upper bridge arm switching tube of the inverter to be disconnected and controlling each lower bridge arm switching tube of the inverter to be conducted so as to enable each stator winding of the motor to be coupled.

Description

Active short-circuit protection circuit, EMB system, EPS system and protection method for vehicle Technical Field The invention relates to the technical field of motor control, in particular to an active short-circuit protection circuit, an EMB system, an EPS system and a protection method for a vehicle. Background With the rapid development of new energy automobiles, the safety requirements of people on the new energy automobiles are also continuously improved. The new energy automobile generally drives the automobile to run through the battery driving motor, and when the battery supplies power to the motor, a power supply circuit possibly causes damage of a switching tube in the circuit due to faults or overhigh counter potential of the motor, so that the fault degree is increased, and the safe running of the new energy automobile is seriously influenced. In order to effectively cut off faults in an automobile circuit, the protection device arranged in the prior art generally directly acts on each switch tube through control signals, so that the faults are cut off through control of each switch tube, and the arrangement mode has a lower safety level, and faults can not be effectively cut off easily due to failure of the control signals. Disclosure of Invention The invention provides an active short-circuit protection circuit, an EMB system, an EPS system and a protection method for a vehicle, which are used for solving the problem that faults in a circuit cannot be effectively cut off. According to an aspect of the present invention, there is provided an active short-circuit protection circuit for a vehicle, which is applied to a main circuit including a battery, an inverter, a gate driving module for driving the inverter, and a motor, the active short-circuit protection circuit for a vehicle including: the PWM output switch module is connected in series between the output end of the gate driving module and the control end of each lower bridge arm switch tube of the inverter; The short-circuit protection switch module is connected in series between the short-circuit protection power supply module and the control end of each lower bridge arm switching tube, and is conducted when the voltage of the battery exceeds a set threshold value, and the conduction of each lower bridge arm switching tube is controlled so as to couple each stator winding of the motor; wherein the PWM output switch module and the short-circuit protection switch module are not conducted simultaneously. Optionally, the motor is a three-phase motor, and the inverter includes a first lower bridge arm switching tube, a second lower bridge arm switching tube and a third lower bridge arm switching tube; the PWM output switch module comprises a first PWM output switch, a second PWM output switch and a third PWM output switch, wherein the first PWM output switch is connected in series between a first lower bridge arm control output end of the gate driving module and a control end of the first lower bridge arm switch tube, the second PWM output switch is connected in series between a second lower bridge arm control output end of the gate driving module and a control end of the second lower bridge arm switch tube, and the third PWM output switch is connected in series between a third lower bridge arm control output end of the gate driving module and a control end of the third lower bridge arm switch tube; And/or the short-circuit protection switch module comprises a first short-circuit protection switch, a second short-circuit protection switch and a third short-circuit protection switch, wherein the first short-circuit protection switch is connected in series between the short-circuit protection power supply module and the control end of the first lower bridge arm switch tube, the second short-circuit protection switch is connected in series between the short-circuit protection power supply module and the control end of the second lower bridge arm switch tube, and the third short-circuit protection switch is connected in series between the short-circuit protection power supply module and the control end of the third lower bridge arm switch tube. Optionally, the active short-circuit protection circuit for a vehicle further includes: the short-circuit protection enabling module outputs a PWM output disabling signal and a short-circuit switch enabling signal according to the short-circuit enabling signal; The PWM output disabling module is connected between the short-circuit protection enabling module and the PWM output switching module and is used for generating a control signal for controlling the PWM output switching module to be disconnected according to the PWM output disabling signal; The short-circuit protection output enabling module is connected between the short-circuit protection enabling module and the short-circuit protection switch module and is used for generating a control signal for controlling the conduction of the short-circuit p