Discharging circuit of motor and vehicle

Abstract

The invention provides a discharging circuit of a motor and a vehicle, and belongs to the technical field of electronics, the discharging circuit comprises a load, and the first end of the load is electrically connected with the driving power supply end of the motor; the control end of the first switch module is electrically connected with the driving power supply end, the first end of the first switch module is electrically connected with the second end of the load, the second end of the first switch module is electrically connected with the grounding end, and the first switch module is switched on when the driving power supply end outputs a first level; the first level includes a reverse electromotive force generated when the motor is suddenly stopped in operation or is reversely dragged.

Description

Technical Field

[0001] The present application belongs to the field of electronic technology, and in particular, relates to a discharge circuit of a motor and a vehicle. Background Art

[0002] Motors are widely used in automotive electronic systems, such as oil pump drive motors, window drive motors, tailgate drive motors, and seat drive motors. Since the motor is an inductive load, when the motor stops suddenly after high-speed operation, the energy of the inductive load needs to be released, which will generate a high electromotive force and damage electronic components. At present, the main solution in the industry is to actively consume the energy of the motor through an external load by sending a control signal through the MCU (micro control unit). However, in the actual application of automotive electronic systems, there are conditions where the motor is manually reversed after the automotive electronic system is powered off or the automotive electronic system is powered off, such as manually towing the trunk tailgate. Since the automotive electronic system is not powered on, it is impossible to actively release the energy generated by the motor being reversed through an external load. Therefore, the electromotive force generated by the reverse drag of the motor has the risk of damaging electronic components. Summary of the invention

[0003] The embodiments of the present application provide a discharge circuit for a motor and a vehicle, aiming to solve the technical problem that the energy of the motor cannot be effectively released.

[0004] A first aspect of an embodiment of the present application provides a discharge circuit of a motor, the discharge circuit of the motor comprising a load, a first end of the load being electrically connected to a drive power supply end of the motor; a first switch module, a control end of the first switch module being electrically connected to the drive power supply end, a first end of the first switch module being electrically connected to a second end of the load, a second end of the first switch module being electrically connected to a ground end, the first switch module being configured to be turned on when the drive power supply end outputs a first level, the first level comprising a reverse electromotive force generated by the motor when the motor stops suddenly or is reversely dragged.

[0005] In one embodiment, the discharge circuit also includes a second switch module and a third switch module; the control end of the second switch module is electrically connected to the driving power supply end, the first end of the second switch module is electrically connected to the driving power supply end and the control end of the third switch module, and the second end of the second switch module is electrically connected to the ground end; the control end of the third switch module is electrically connected to the driving power supply end, the first end of the third switch module is electrically connected to the driving power supply end, and the second end of the third switch module is electrically connected to the control end of the first switch module; when the driving power supply end outputs a first level, the second switch module and the third switch module are turned on, and the first level of the driving power supply end is transmitted to the control end of the first switch module through the third switch module.

[0006] In one embodiment, the discharge circuit also includes a fourth switch module; the control end of the fourth switch module is electrically connected to the second end of the third switch module, the first end of the fourth switch module is electrically connected to the control end of the third switch module, the second end of the fourth switch module is electrically connected to the ground end, and the fourth switch module is used to be turned on when the second end of the third switch module outputs a first level to lock the third switch module in a conducting state.

[0007] In one embodiment, the discharge circuit further includes: a transient voltage suppression diode, a first electrode of the transient voltage suppression diode is electrically connected to the driving power supply end, and a second electrode of the transient voltage suppression diode is electrically connected to the control end of the second switch module.

[0008] In one embodiment, the discharge circuit also includes: a fifth switch module, the control end of the fifth switch module is electrically connected to the first control signal end, the first end of the fifth switch module is electrically connected to the control end of the first switch module and the second end of the third switch module, the second end of the fifth switch module is electrically connected to the ground end, the first control signal end is used to provide a first level when the motor is in a normal working state; the fifth switch module is turned on under the control of the first level provided by the first control signal end.

[0009] In one of the embodiments, the control end of the first switch module is also electrically connected to the second control signal end; when the motor is in a normal working state, the second control signal end provides a second level so that the first switch module is turned off under the control of the second level; when the motor stops, the second control signal end provides a first level, and the control end of the first switch module is turned on under the control of the first level provided by the second control signal end.

[0010] In one embodiment, the discharge circuit also includes a first resistor; the first end of the first resistor is electrically connected to the control end of the first switch module; the second end of the first resistor is electrically connected to the second end of the first switch module; the discharge circuit also includes a second resistor, a third resistor, and a fourth resistor; the first end of the second resistor is electrically connected to the control end of the second switch module; the second end of the second resistor is electrically connected to the second end of the second switch module; the first end of the third resistor is electrically connected to the driving power supply end; the second end of the third resistor is electrically connected to the control end of the second switch module; the first end of the fourth resistor is electrically connected to the first end of the second switch module; the discharge circuit also includes a fifth resistor, a sixth resistor, and a seventh resistor; the first end of the fifth resistor is electrically connected to the second end of the fourth resistor; the second end of the fifth resistor is electrically connected to the first end of the third switch module; the first end of the sixth resistor is electrically connected to the second end of the third switch module; the second end of the sixth resistor is electrically connected to the control end of the first switch module; the first end of the seventh resistor is electrically connected to the control end of the third switch module; the second end of the seventh resistor is electrically connected to the first end of the fourth switch module.

[0011] In one embodiment, the discharge circuit also includes an eighth resistor, a ninth resistor, and a tenth resistor; the first end of the eighth resistor is electrically connected to the second end of the seventh resistor; the second end of the eighth resistor is electrically connected to the first end of the fourth switch module; the first end of the ninth resistor is electrically connected to the control end of the fourth switch module; the second end of the ninth resistor is electrically connected to the second end of the sixth resistor; the first end of the tenth resistor is electrically connected to the control end of the fourth switch module; the second end of the tenth resistor is electrically connected to the second end of the fourth switch module; the discharge circuit also includes an eleventh resistor and a twelfth resistor; the first end of the eleventh resistor is electrically connected to the control end of the fifth switch module; the second end of the eleventh resistor is electrically connected to the second end of the fifth switch module; the first end of the twelfth resistor is electrically connected to the drive control end; the second end of the twelfth resistor is electrically connected to the control end of the fifth switch module.

[0012] In one embodiment, the discharge circuit also includes a first diode and a second diode, the input end of the first diode is electrically connected to the second signal control end; the output end of the first diode is electrically connected to the control end of the first switch module; the input end of the second diode is electrically connected to the first end of the fifth switch module; and the output end of the second diode is electrically connected to the control end of the first switch module.

[0013] A second aspect of an embodiment of the present application provides a vehicle, the vehicle comprising a discharge circuit of the motor according to any one of the above embodiments.

[0014] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0015] The first end of the load is electrically connected to the driving power supply end of the motor, the control end of the first switch module is electrically connected to the driving power supply end, the first end of the first switch module is electrically connected to the second end of the load, and the second end of the first switch module is electrically connected to the ground end. The first switch module is used to conduct when the driving power supply end outputs a first level, and the first level includes the reverse electromotive force generated by the motor when it stops running or is reversely dragged; even if the control system (such as an automotive electronic system) has been powered off or powered off, when the motor stops running or is reversely dragged, the driving power supply end of the motor itself will generate higher energy (or reverse electromotive force), and its higher reverse electromotive force will form a first level and be transmitted to the first switch module, so that the first switch module is turned on, and then the energy of the driving power supply end will be released through the load. Therefore, when the control system has been powered off or powered off, the embodiment of the present application controls the first switch module to conduct through the first level (reverse electromotive force) generated by the motor itself when it stops running or is reversely dragged, so that the energy of the driving power supply end can be released through the load, thereby solving the problem that the energy of the motor cannot be effectively released after the control system is powered off or powered off, and reducing the risk of damaging electronic devices by the energy generated when the motor stops running or is reversely dragged. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a structural schematic diagram of a discharge circuit of a motor provided in one embodiment of the present application;

[0018] Figure 2 is another structural schematic diagram of a discharge circuit of a motor provided in one embodiment of the present application;

[0019] Figure 3 It is a circuit principle schematic diagram of a discharge circuit of a motor provided in one embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clear, this application is further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain this application and are not used to limit this application.

[0021] See also Figure 1 , Figure 1 It is a structural schematic diagram of a discharge circuit of a motor provided in one embodiment of the present application. The discharge circuit of the motor includes a load 10 and a first switch module 11. The first end of the load 10 is electrically connected to the drive power supply terminal VBAT of the motor. The control end of the first switch module 11 is electrically connected to the drive power supply terminal VBAT, the first end of the first switch module 11 is electrically connected to the second end of the load 10, the second end of the first switch module 11 is electrically connected to the ground terminal GND, and the first switch module 11 is used to be turned on when the drive power supply terminal VBAT outputs a first level. Among them, the first level output by the drive power supply terminal VBAT may include the reverse electromotive force generated by the motor when it stops suddenly or is reversely dragged.

[0022] In this embodiment, the load 10 is an energy consuming device, which may be at least one of a resistor, a capacitor, and an inductor; and / or any two of the resistors, capacitors, and inductors, and a combination of the above two components, and an electric energy conversion device.

[0023] In this embodiment, the driving power supply terminal VBAT is a power supply terminal for the motor consuming the load 10 or a power supply terminal for the load 10 , and functions as a port for outputting the motor running energy, and can be the output motor waste energy or motor residual energy.

[0024] In some embodiments, the first switch module 11 includes at least one switch device, and the switch device is at least any one type or a combination of multiple types of transistors, field effect transistors, or IGBTs (insulated gate bipolar transistors).

[0025] In some other embodiments, the first switch module 11 may also include two switch devices, one of which is a field effect transistor and the other is a combination of a triode; or one of which is a combination of a triode and the other is an IGBT.

[0026] In this embodiment, when the switch device is a field effect tube, the control end of the first switch module 11 is the gate of the field effect tube, the first end of the first switch module 11 is the drain of the field effect tube, and the second end of the first switch module 11 is the source of the field effect tube. Similarly, when the switch device is a triode, the control end of the first switch module 11 is the base of the triode, the first end of the first switch module 11 is the collector of the triode, and the second end of the first switch module 11 is the emitter of the triode; when the switch device is an IGBT, the various ends are not described in detail.

[0027] In this embodiment, the first switch module 11 is used to be turned on when the driving power supply terminal VBAT outputs a first level. At this time, the load 10 is grounded through the first switch module 11 to complete the release of energy of the driving power supply terminal VBAT.

[0028] Among them, the driving power supply terminal VBAT can output different level signals under different working states. For example, when the control system (such as an automotive electronic system) is not powered off or not powered off, the motor operation state may include normal operation and motor stop operation. Specifically, when the motor is operating normally, the driving power supply terminal VBAT is a second level (such as a low level), and the first switch module 11 is in a cut-off state. When the motor stops running, the driving power supply terminal VBAT is a first level (such as a high level), the first switch module 11 is in a conducting state, and the load 10 forms a path to consume motor energy.

[0029] When the control system (such as the automotive electronic system) is powered off or the power is cut off, the motor operation status includes the motor operation stopping suddenly (such as power off) and the motor being reversely dragged.

[0030] The embodiment of the present application makes full use of the first level (reverse electromotive force) generated by the motor itself when the motor stops running or is reversely dragged. Even if the control system (such as an automotive electronic system) has been powered off or powered off, when the motor stops running or is reversely dragged, the driving power supply end of the motor itself will generate higher energy (or reverse electromotive force), and its higher reverse electromotive force will form a first level and be transmitted to the first switch module, so that the first switch module is turned on, and then the energy of the driving power supply end will be released through the load. Therefore, when the control system has been powered off or powered off, the embodiment of the present application controls the first switch module to be turned on by the first level (reverse electromotive force) generated by the motor itself when the motor stops running or is reversely dragged, so that the energy of the driving power supply end can be released through the load, thereby solving the problem that the energy of the motor cannot be effectively released after the control system is powered off or powered off, and reducing the risk of damage to electronic devices by the energy generated when the motor stops running or is reversely dragged.

[0031] In this embodiment, the discharge circuit of the motor consumes different amounts of energy in different working states of the load 10. For example, when the motor operates normally, the discharge circuit is an active discharge circuit; when the motor operates abnormally, the circuit is a passive discharge circuit.

[0032] See also Figure 2 , Figure 2 1 is another structural schematic diagram of a discharge circuit of a motor provided in an embodiment of the present application. The discharge circuit also includes a second switch module 21 and a third switch module 31. The control end of the second switch module 21 is electrically connected to the driving power supply end VBAT, the first end of the second switch module 21 is electrically connected to the driving power supply end VBAT and the control end of the third switch module 31, and the second end of the second switch module 21 is electrically connected to the ground end. The control end of the third switch module 31 is electrically connected to the driving power supply end VBAT, the first end of the third switch module 31 is electrically connected to the driving power supply end VBAT, and the second end of the third switch module 31 is electrically connected to the control end of the first switch module 11. When the driving power supply end VBAT outputs a first level, the second switch module 21 and the third switch module 31 are turned on, and the first level of the driving power supply end VBAT is transmitted to the control end of the first switch module 11 through the third switch module 31.

[0033] In this embodiment, when the second switch module 21 and the third switch module 31 are turned on, the discharge circuit of the motor is a passive discharge circuit; usually, the motor is reversely dragged on the driving power supply terminal VBAT to form a large back electromotive force. In order to protect the electronic devices in the circuit, the discharge circuit breaks down some electronic devices to complete passive discharge.

[0034] It should be noted that each end of each switch module can refer to the control end, the first end, and the second end of the first switch module 11 to select ports of different switch devices, which will not be repeated here.

[0035] In this embodiment, the second switch module 21 and the third switch module 31 are continuously turned on at different stages. In the initial state of the passive discharge circuit, the second switch module 21 and the third switch module 31 are turned on. When the discharge energy drops to a preset value, the second switch module 21 is turned off and turned on, and the third switch device continues to conduct the energy of the driving power supply terminal VBAT. When the energy drops to a certain preset value again or the energy is discharged, the third switch module 31 stops conducting.

[0036] In one embodiment, the discharge circuit further includes a fourth switch module 41; a control end of the fourth switch module 41 is electrically connected to the second end of the third switch module 31, a first end of the fourth switch module 41 is electrically connected to the control end of the third switch module 31, and a second end of the fourth switch module 41 is electrically connected to the ground end. The fourth switch module 41 is used to be turned on when the second end of the third switch module 31 outputs the first level, and the third switch module 31 is locked in the on state.

[0037] In this embodiment, the fourth switch module 41 is used to lock the third switch module 31 in the on state. When the energy to be discharged does not reach the preset value, the fourth switch module 41 is turned on, the voltage difference at the control end of the third switch module 31 is maintained, and the third switch module 31 is locked in the on state. For example, when the fourth switch module 41 and the third switch module 31 are triodes, the fourth switch module 41 changes the circuit node voltage according to the conduction of the second switch module 21, and the fourth switch module 41 is turned on. When the fourth switch module 41 is turned on, the base voltage of the third switch module 31 is balanced, and the collector and emitter of the third switch module 31 are turned on. At this time, the fourth switch module 41 locks the third switch module 31 in the on state.

[0038] In one embodiment, the discharge circuit further includes: a transient voltage suppression diode, a first electrode of the transient voltage suppression diode is electrically connected to the driving power supply terminal VBAT, and a second electrode of the transient voltage suppression diode is electrically connected to the control terminal of the second switch module 21.

[0039] In this embodiment, the transient voltage suppression diode is a breakdown diode, which provides rapid overvoltage protection for the circuit. When the motor is reversely dragged, the voltage is higher than the breakdown voltage on the mark, and the transient voltage suppression diode (TVSD3) will be turned on. After being turned on, the motor enters a passive discharge state.

[0040] In this embodiment, the first pole of the transient voltage suppression diode is the output end of the breakdown diode, and the second pole of the transient voltage suppression diode is the input end of the breakdown diode.

[0041] In one embodiment, the discharge circuit further includes: a fifth switch module 51, a control end of the fifth switch module 51 is electrically connected to the first control signal end CTRL1, a first end of the fifth switch module 51 is electrically connected to the control end of the first switch module 11 and the second end of the third switch module 31, and a second end of the fifth switch module 51 is electrically connected to the ground end. The first control signal end CTRL1 is used to provide a first level when the motor is in a normal working state, and the fifth switch module 51 is turned on under the control of the first level provided by the first control signal end CTRL1.

[0042] In this embodiment, the first control signal terminal CTRL1 is electrically connected to a micro control unit or a microprocessor. When the control unit is electrically connected to the discharge circuit through the first control signal terminal CTRL1, a level parameter value is preset according to experimental needs to output a first control signal.

[0043] In this embodiment, when the first control signal terminal CTRL1 provides a first level to control the fifth switch module 51 to be turned on, the motor discharge circuit is an active discharge circuit. The first control signal terminal CTRL1 inputs a first level through a microcontroller unit or a microprocessor, and the first level changes the circuit node voltage to control the first switch module 11 to be turned on or off.

[0044] In one embodiment, the control end of the first switch module 11 is also electrically connected to the second control signal end CTRL2. When the motor is in a normal working state, the second control signal end CTRL2 provides a second level so that the first switch module 11 is turned off under the control of the second level, thereby not affecting the normal operation of the motor. When the motor stops, the second control signal end CTRL2 provides a first level, and the control end of the first switch module 11 is turned on under the control of the first level provided by the second control signal end CTRL2.

[0045] See also Figure 3 , Figure 3 This is a schematic diagram of the circuit principle of a discharge circuit of a motor provided in an embodiment of the present application. The first level and the second level control the node voltage value in the circuit. When the motor is working normally, the first level is high, the second level is low, the voltage at point 1 remains low, the voltage at point 2 remains low, and the first switch module 11 is turned off, which does not affect the operation of the motor.

[0046] Further, when the motor stops rotating, the first level is high, the second level is high, the voltage at point 1 is high, and the voltage at point 2 is high. At this time, the first switch module 11 is turned on, and the load 10 discharges energy.

[0047] On the contrary, when the motor is abnormal, the system is powered off, the first level and the second level are reduced in voltage by the pull-down resistor, and the first switch module 11 is turned off.

[0048] Furthermore, if the motor is reversely dragged or the motor is running when the power is cut off, the energy of the motor cannot be released, and a high reverse electromotive force will be generated on the driving power supply terminal VBAT. When the driving power supply terminal VBAT voltage is higher than the breakdown voltage of the TVSD3 tube, the TVSD3 tube breaks down, and the second switch module 21 tube is turned on, and the third switch module 31 is turned on. At this time, the voltage at point 1 is pulled up, and the fourth switch module 41 is turned on, so that the third switch module 31 is locked in the on state. At the same time, the first switch module 11 is turned on, the energy of the motor will be gradually consumed by the load 10, and the driving power supply voltage will gradually decrease. When the driving power supply terminal VBAT drops below the breakdown voltage of the TVSD3 tube, TVSD3 returns to the cut-off state, the voltage at point 3 is pulled down, and the second switch module 21 is turned off, but the fourth switch module 41 is in the on state, so the third switch module 31 is always locked in the on state, and the driving power supply terminal VBAT continues to drive the first switch module 11 to turn on through the third switch module 31, and the motor energy continues to be released. When the driving power supply terminal VBAT voltage drops below the driving start-up voltage of the first switch module 11, the first switch module 11 is turned off, and the motor energy is basically released.

[0049] In one embodiment, the discharge circuit further includes a first resistor R1; the first end of the first resistor R1 is electrically connected to the control end of the first switch module 11; the second end of the first resistor R1 is electrically connected to the second end of the first switch module 11. The discharge circuit further includes a second resistor R2, a third resistor R3, and a fourth resistor R4; the first end of the second resistor R2 is electrically connected to the control end of the second switch module 21; the second end of the second resistor R2 is electrically connected to the second end of the second switch module 21. The first end of the third resistor R3 is electrically connected to the driving power supply end VBAT; the second end of the third resistor R3 is electrically connected to the control end of the second switch module 21. The first end of the fourth resistor R4 is electrically connected to the first end of the second switch module 21. The discharge circuit further includes a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7; the first end of the fifth resistor R5 is electrically connected to the second end of the fourth resistor R4; the second end of the fifth resistor R5 is electrically connected to the first end of the third switch module 31. The first end of the sixth resistor R6 is electrically connected to the second end of the third switch module 31; the second end of the sixth resistor R6 is electrically connected to the control end of the first switch module 11. A first end of the seventh resistor R7 is electrically connected to the control end of the third switch module 31 ; a second end of the seventh resistor R7 is electrically connected to a first end of the fourth switch module 41 .

[0050] The discharge circuit also includes an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10. The first end of the eighth resistor R8 is electrically connected to the second end of the seventh resistor R7; the second end of the eighth resistor R8 is electrically connected to the first end of the fourth switch module 41. The first end of the ninth resistor R9 is electrically connected to the control end of the fourth switch module 41; the second end of the ninth resistor R9 is electrically connected to the second end of the sixth resistor R6. The first end of the tenth resistor R10 is electrically connected to the control end of the fourth switch module 41; the second end of the tenth resistor R10 is electrically connected to the second end of the fourth switch module 41.

[0051] The discharge circuit further includes an eleventh resistor R11 and a twelfth resistor R12. The first end of the eleventh resistor R11 is electrically connected to the control end of the fifth switch module 51; the second end of the eleventh resistor R11 is electrically connected to the second end of the fifth switch module 51. The first end of the twelfth resistor R12 is electrically connected to the drive control end; the second end of the twelfth resistor R12 is electrically connected to the control end of the fifth switch module 51.

[0052] In this embodiment, the first resistor R1 to the twelfth resistor R12 are configured functional resistors, which can form a bias with the corresponding switch module to prevent signal distortion. The function of the specific resistor can vary according to the circuit design. Preferably, the first resistor R1, the second resistor R2, the tenth resistor R10, and the eleventh resistor R11 are pull-down resistors, which pull down the level flowing through the corresponding switch module to reduce the level and prevent signal distortion, that is, the first switch module 11, the second switch module 21, the fourth switch module 41, and the fifth switch module 51 are configured with pull-down resistors; the remaining resistors are current limiting resistors or voltage divider resistors, which play a role in protecting the switch components.

[0053] In one embodiment, the discharge circuit further includes a first diode D1 and a second diode D2, wherein the input end of the first diode D1 is electrically connected to the second signal control end CTRL2; the output end of the first diode D1 is electrically connected to the control end of the first switch module 11. The input end of the second diode D2 is electrically connected to the first end of the fifth switch module 51; the output end of the second diode D2 is electrically connected to the control end of the first switch module 11.

[0054] In this embodiment, the first diode D1 and the second diode D2 can be selected from commonly used single-phase conduction diodes. Since the first diode D1 and the second diode D2 are unidirectionally conducted, it can effectively prevent the high electromotive force of the driving power supply terminal VBAT from being transmitted to the second signal control terminal CTRL2 and / or other modules in the discharge circuit of the motor (such as the fifth switch module 51) through the first switch module 11 when the first switch module 11 is damaged or leaks, thereby protecting the second signal control terminal CTRL2 and / or other modules in the discharge circuit of the motor.

[0055] A second aspect of an embodiment of the present application provides a vehicle, the vehicle comprising a discharge circuit of the motor according to any one of the above embodiments.

[0056] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements shall be within the scope of protection of the present application without causing the essence of the corresponding technical solutions to deviate from the spirit of the technical solutions of the embodiments of the present application.

Claims

1. A discharge circuit for a motor, characterized in that: include: A load, wherein a first end of the load is electrically connected to a driving power supply end of the motor; A first switch module, wherein a control end of the first switch module is electrically connected to the drive power supply end, a first end of the first switch module is electrically connected to a second end of the load, and a second end of the first switch module is electrically connected to a ground end, and the first switch module is configured to be turned on when the drive power supply end outputs a first level, wherein the first level includes a reverse electromotive force generated by the motor when the motor stops running or is reversely dragged.

2. The discharge circuit according to claim 1, characterized in that: The discharge circuit also includes a second switch module and a third switch module; The control end of the second switch module is electrically connected to the driving power supply end, the first end of the second switch module is electrically connected to the driving power supply end and the control end of the third switch module, and the second end of the second switch module is electrically connected to the ground end; The control end of the third switch module is electrically connected to the driving power supply end, the first end of the third switch module is electrically connected to the driving power supply end, and the second end of the third switch module is electrically connected to the control end of the first switch module; When the driving power supply end outputs the first level, the second switch module and the third switch module are turned on, and the first level of the driving power supply end is transmitted to the control end of the first switch module through the third switch module.

3. The discharge circuit according to claim 3, characterized in that: The discharge circuit also includes a fourth switch module; The control end of the fourth switch module is electrically connected to the second end of the third switch module, the first end of the fourth switch module is electrically connected to the control end of the third switch module, the second end of the fourth switch module is electrically connected to the ground end, and the fourth switch module is used to be turned on when the second end of the third switch module outputs a first level to lock the third switch module in a conducting state.

4. The discharge circuit according to claim 2, characterized in that: The discharge circuit further comprises: A transient voltage suppression diode, wherein a first electrode of the transient voltage suppression diode is electrically connected to the driving power supply end, and a second electrode of the transient voltage suppression diode is electrically connected to the control end of the second switch module.

5. The discharge circuit according to claim 3, characterized in that: The discharge circuit further comprises: a fifth switch module, wherein the control end of the fifth switch module is electrically connected to the first control signal end, the first end of the fifth switch module is electrically connected to the control end of the first switch module and the second end of the third switch module, the second end of the fifth switch module is electrically connected to the ground end, and the first control signal end is used to provide a first electrical level when the motor is in a normal working state; The fifth switch module is turned on under the control of the first level provided by the first control signal terminal.

6. The discharge circuit according to claim 2, characterized in that: The control end of the first switch module is also electrically connected to the second control signal end; When the motor is in a normal working state, the second control signal terminal provides a second level, so that the first switch module is turned off under the control of the second level; When the motor stops, the second control signal terminal provides a first level, and the control terminal of the first switch module is turned on under the control of the first level provided by the second control signal terminal.

7. The discharge circuit according to claim 5, characterized in that: The discharge circuit further includes a first resistor; a first end of the first resistor is electrically connected to the control end of the first switch module; a second end of the first resistor is electrically connected to the second end of the first switch module; The discharge circuit further includes a second resistor, a third resistor, and a fourth resistor; the first end of the second resistor is electrically connected to the control end of the second switch module; the second end of the second resistor is electrically connected to the second end of the second switch module; the first end of the third resistor is electrically connected to the driving power supply end; the second end of the third resistor is electrically connected to the control end of the second switch module; the first end of the fourth resistor is electrically connected to the first end of the second switch module; The discharge circuit also includes a fifth resistor, a sixth resistor, and a seventh resistor; the first end of the fifth resistor is connected to the second end of the fourth resistor; the second end of the fifth resistor is electrically connected to the first end of the third switch module; the first end of the sixth resistor is electrically connected to the second end of the third switch module; the second end of the sixth resistor is electrically connected to the control end of the first switch module; the first end of the seventh resistor is electrically connected to the control end of the third switch module; and the second end of the seventh resistor is electrically connected to the first end of the fourth switch module.

8. The discharge circuit according to claim 7, characterized in that: The discharge circuit further includes an eighth resistor, a ninth resistor, and a tenth resistor; the first end of the eighth resistor is electrically connected to the second end of the seventh resistor; the second end of the eighth resistor is electrically connected to the first end of the fourth switch module; the first end of the ninth resistor is electrically connected to the control end of the fourth switch module; the second end of the ninth resistor is electrically connected to the second end of the sixth resistor; the first end of the tenth resistor is electrically connected to the control end of the fourth switch module; the second end of the tenth resistor is electrically connected to the second end of the fourth switch module; The discharge circuit also includes an eleventh resistor and a twelfth resistor; the first end of the eleventh resistor is electrically connected to the control end of the fifth switch module; the second end of the eleventh resistor is electrically connected to the second end of the fifth switch module; the first end of the twelfth resistor is electrically connected to the drive control end; the second end of the twelfth resistor is electrically connected to the control end of the fifth switch module.

9. The discharge circuit according to claim 7, characterized in that: The discharge circuit also includes a first diode and a second diode, wherein the input end of the first diode is electrically connected to the second signal control end, and the output end of the first diode is electrically connected to the control end of the first switch module; the input end of the second diode is electrically connected to the first end of the fifth switch module, and the output end of the second diode is electrically connected to the control end of the first switch module.

10. A vehicle, characterized in that: A discharge circuit comprising the motor as claimed in any one of claims 1 to 9.

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