Driving protection module and method, motor driver and vehicle

Abstract

The invention provides a driving protection module and method, a motor driver and a vehicle, and the driving protection module comprises a bridge arm circuit which is used for controlling the on-off of a switching tube, and generating a driving signal for driving a motor to work according to an on-off signal, and a protection circuit which is used for protecting the switching tube, the drain-source voltage difference or the drain-source current variation of the switching tube is stabilized in a preset interval; in the working process of the bridge arm circuit, the protection circuit can protect the switch tube in the bridge arm circuit, and when the bridge arm circuit is short-circuited, the protection circuit can stabilize the drain-source voltage difference or drain-source current variation of the switch tube in the bridge arm circuit in a preset interval, so that the protection effect of the bridge arm circuit is improved. Therefore, the problem of avalanche breakdown caused by overlarge voltage difference of the switch tube in the bridge arm circuit due to oversmall output negative voltage of the source electrode of the switch tube in the bridge arm circuit is solved, and the situation of structural damage caused by the avalanche breakdown of the switch tube is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of motor drive, and particularly to a drive protection module, method, motor driver and vehicle. Background Art

[0002] With the development of new energy vehicles, the importance of thermal management in the whole vehicle has been increasingly emphasized. Therefore, the design requirements for the water pump controller, that is, the TMC (Temperature Management Controller), which is one of the core components of the vehicle thermal manager, have also been correspondingly improved. The TMC controls the ambient temperatures of the drive motor, motor controller and power battery through a brushless DC motor load. The brushless DC motor consists of a stator and a rotor. Its working principle is that the stator is driven by a rotating magnetic field. In a brushless DC motor, the permanent magnet (rotor) is in motion and the current-carrying coil (stator) is fixed. When a current passes through the coil, a corresponding polarity will be generated. According to the principle that like polarities repel each other and opposite polarities attract each other, the rotor can be driven. By controlling the on-off and polarity of the three-phase coil, a rotating magnetic field can be used to drive the rotor to rotate.

[0003] In the related art, the brushless DC motor works through an external three-phase inverter circuit on the TMC, that is, an external MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) module for the brushless DC motor. However, since the wire harnesses of the three-phase inverter circuit are usually wound together, when a two-phase short circuit occurs between two wire harnesses due to aging or wear, if the three-phase inverter circuit is in the working state, it is very easy for the MOSFET in the three-phase inverter circuit to be damaged due to overcurrent. Even though the overcurrent protection mechanism will be triggered when a two-phase short circuit occurs, since the instantaneous current in the three-phase inverter circuit is too large during a two-phase short circuit, it is very likely that the MOSFET will be damaged before the overcurrent protection mechanism intervenes. At this time, the temperature management controller needs to be replaced. Therefore, it is still necessary to improve the three-phase inverter circuit in the related art to protect the MOSFET in the three-phase inverter circuit and reduce the probability of the MOSFET being burned out during a two-phase short circuit in the three-phase inverter circuit. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the prior art, the present application provides a drive protection module, method, motor driver and vehicle to solve the above technical problems.

[0005] According to one aspect of the embodiments of the present application, a drive protection module is provided, including: a leg circuit for controlling the on / off of a switching transistor and generating a drive signal for driving a motor to operate according to the on / off signal; a protection circuit for protecting the switching transistor so that the drain-source voltage difference or the change amount of the drain-source current of the switching transistor is stabilized within a preset range.

[0006] In one embodiment of the present application, the power supply terminal of the leg circuit is used to connect to a power supply, and the control terminal of the leg circuit is used to access a voltage control signal; the leg circuit controls the on / off of the switching transistor according to the power supply signal and the voltage control signal to obtain the on / off signal.

[0007] In one embodiment of the present application, the protection circuit includes: a filtering capacitor, and / or, a voltage-dividing resistor, and the filtering capacitor, and / or, the voltage-dividing resistor is arranged on the leg circuit.

[0008] In one embodiment of the present application, the leg circuit includes: different-phase leg circuits, and each phase leg circuit includes: an upper half-bridge switching transistor and a lower half-bridge switching transistor. The drain of the upper half-bridge switching transistor is used to connect to the power supply, the gate of the upper half-bridge switching transistor is used to input an upper half-bridge voltage control signal, the source of the upper half-bridge switching transistor is connected to the drain of the lower half-bridge switching transistor, the gate of the lower half-bridge switching transistor is used to input a lower half-bridge voltage control signal, and the source of the lower half-bridge switching transistor is used to be grounded through a grounding device.

[0009] In one embodiment of the present application, one end of the filtering capacitor is connected to the drain of the upper half-bridge switching transistor, and the other end of the filtering capacitor is connected to the source of the lower half-bridge switching transistor.

[0010] In one embodiment of the present application, the voltage-dividing resistor includes: an upper half-bridge voltage-dividing resistor and a lower half-bridge voltage-dividing resistor. The upper half-bridge voltage-dividing resistor is connected to the gate of the upper half-bridge switching transistor; the lower half-bridge voltage-dividing resistor is connected to the gate of the lower half-bridge switching transistor.

[0011] In one embodiment of the present application, the leg circuit further includes: an upper half-bridge gate-source voltage regulator device, one end of the upper half-bridge gate-source voltage regulator device is connected to the gate of the upper half-bridge switching transistor, and the other end of the upper half-bridge gate-source voltage regulator device is connected to the source of the upper half-bridge switching transistor; a lower half-bridge gate-source voltage regulator device, one end of the lower half-bridge gate-source voltage regulator device is connected to the gate of the lower half-bridge switching transistor, and the other end of the lower half-bridge gate-source voltage regulator device is connected to the source of the lower half-bridge switching transistor.

[0012] According to one aspect of the embodiments of the present application, a driving protection method is provided, including: obtaining a power supply signal and a voltage control signal; controlling the on / off of a switching transistor according to the power supply signal and the voltage control signal to obtain an on / off signal; generating a driving signal for driving a motor to operate according to the on / off signal, and protecting the switching transistor during the process of driving the motor to operate, so that the drain-source voltage difference or the change amount of the drain-source current of the switching transistor is stabilized within a preset range.

[0013] According to one aspect of the embodiments of the present application, a motor driver is provided, and the motor driver includes the driving protection module as described above.

[0014] According to one aspect of the embodiments of the present application, a vehicle is provided, and the vehicle includes the driving protection module as described above or the motor driver as described above.

[0015] Advantages of the present invention: By providing a leg circuit for controlling the on / off of a switching transistor and generating a driving signal according to the on / off signal, and a protection circuit for protecting the switching transistor so that the drain-source voltage difference or the change amount of the drain-source current of the switching transistor is stabilized within a preset range, not only can the protection circuit protect the switching transistor in the leg circuit during the operation of the leg circuit, but also when a short circuit occurs in the leg circuit, the protection circuit can make the drain-source voltage difference or the change amount of the drain-source current of the switching transistor in the leg circuit stabilized within a preset range, thereby improving the problem that the negative voltage output at the source of the switching transistor in the leg circuit is too small, resulting in an excessive voltage difference across the switching transistor in the leg circuit and causing avalanche breakdown, and reducing the structural damage caused by the avalanche breakdown of the switching transistor.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. Description of the Drawings

[0017] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts. In the drawings:

[0018] Figure 1 is the circuit diagram of the driving protection module in the related art;

[0019] Figure 2 is the circuit diagram of the two-phase short-circuit test on the driving protection module in the related art;

[0020] Figure 3It is the circuit diagram of the drive protection module shown in an exemplary embodiment of the present application;

[0021] Figure 4 It is the simulation circuit diagram of the drive protection module shown in an exemplary embodiment of the present application;

[0022] Figure 5 It is the simulation result diagram of the drive protection module shown in an exemplary embodiment of the present application;

[0023] Figure 6 It is the schematic diagram of the exemplary system architecture shown in an exemplary embodiment of the present application;

[0024] Figure 7 It is the flowchart of the drive protection method shown in an exemplary embodiment of the present application;

[0025] Figure 8 It shows the schematic diagram of the structure of a computer system of a motor driver suitable for implementing the embodiments of the present application. Detailed Description of the Invention

[0026] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0027] The block diagrams shown in the drawings are only functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0028] The flowcharts shown in the drawings are only exemplary descriptions and do not necessarily include all contents and operations / steps, nor do they necessarily need to be executed in the described order. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined. Therefore, the actual execution order may change according to the actual situation.

[0029] The term "plurality" mentioned in the present application refers to two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0030] The technical solution of the embodiment of the present application relates to related technologies such as drive protection, and is specifically described through the following embodiments:

[0031] Figure 1 It is the circuit diagram of the drive protection module in the related technology. As Figure 1 shown, the drive protection module in the related technology includes: the first switch tube M1, the second switch tube M2, the third switch tube M3, the fourth switch tube M4, the fifth switch tube M5, and the sixth switch tube M6. Among them, the first switch tube M1 and the second switch tube M2 form a U-phase bridge arm circuit, the third switch tube M3 and the fourth switch tube M4 form a V-phase bridge arm circuit, and the fifth switch tube M5 and the sixth switch tube M6 form a W-phase bridge arm circuit. The power supply terminals of the U-phase bridge arm circuit, the V-phase bridge arm circuit, and the W-phase bridge arm circuit are all connected to the power supply, the ground terminals of the U-phase bridge arm circuit, the V-phase bridge arm circuit, and the W-phase bridge arm circuit are all grounded, and the wire harnesses led out from the U-phase bridge arm circuit, the V-phase bridge arm circuit, and the W-phase bridge arm circuit all provide drive signals for the brushless DC motor. When a short circuit occurs between the wire harness led out from the U-phase bridge arm circuit and the wire harness led out from the V-phase bridge arm circuit, between the wire harness led out from the V-phase bridge arm circuit and the wire harness led out from the W-phase bridge arm circuit, or between the wire harness led out from the U-phase bridge arm circuit and the wire harness led out from the W-phase bridge arm circuit, it is very easy to cause an instantaneous current to be too large, resulting in damage to the switch tube and even damage to the entire drive protection module.

[0032] Figure 2 It is the circuit diagram for the two-phase short-circuit test of the drive protection module in the related technology. In Figure 2 it, the circuit diagram for the two-phase short-circuit test of the drive protection module includes: the first switch tube M1, the second switch tube M2, the third switch tube M3, the fourth switch tube M4, the fifth switch tube M5, and the sixth switch tube M6. Among them, the first switch tube M1 and the second switch tube M2 form a U-phase bridge arm circuit, the third switch tube M3 and the fourth switch tube M4 form a V-phase bridge arm circuit, and the fifth switch tube M5 and the sixth switch tube M6 form a W-phase bridge arm circuit. The power supply terminals of the U-phase bridge arm circuit, the V-phase bridge arm circuit, and the W-phase bridge arm circuit are all connected to the power supply, the ground terminals of the U-phase bridge arm circuit, the V-phase bridge arm circuit, and the W-phase bridge arm circuit are all grounded, and the wire harnesses led out from the U-phase bridge arm circuit, the V-phase bridge arm circuit, and the W-phase bridge arm circuit all provide drive signals for the brushless DC motor, and the test wire harness short-circuited between the V phase and the W phase.

[0033] The two-phase short-circuit test of the drive protection module is carried out at room temperature. When the TMC is operating normally with a load, a test harness with a very small impedance (about 30 mΩ) is used to short-circuit between the V phase and the W phase, resulting in the damage of the upper half-bridge switch (MOSFET) of the W phase. It is always the upper half-bridge switch (MOSFET) of the W phase that is damaged when the motor starts to rotate forward, and this phenomenon is more likely to occur when the supply voltage is higher. This shows that the damage of the upper half-bridge switch (MOSFET) is due to the fact that when there is a two-phase short circuit, the output voltage of the source of the upper half-bridge switch (MOSFET) is too low, causing the voltage drop between the drain and the source of the upper half-bridge switch to increase, resulting in too fast a turn-off speed of the upper half-bridge switch (MOSFET); moreover, when the supply voltage reaches 16 V, the upper half-bridge switch (MOSFET) will be burned out. The performance after the switch (MOSFET) is damaged is that there is a direct connection between the gate, the drain and the source.

[0034] In an embodiment of the present application, the drive protection module includes:

[0035] The bridge arm circuit is used to control the on and off of the switch and generate a drive signal for driving the motor to work according to the on and off signal; the protection circuit is used to protect the switch so that the voltage difference between the drain and the source or the change amount of the drain-source current of the switch is stabilized within a preset range.

[0036] In an embodiment of the present application, the preset range can be set according to the actual situation and will not be specifically limited here. By providing a bridge arm circuit for controlling the on and off of the switch and generating a drive signal according to the on and off signal, and a protection circuit for protecting the switch so that the voltage difference between the drain and the source or the change amount of the drain-source current of the switch is stabilized within a preset range, not only can the protection circuit protect the switch in the bridge arm circuit during the operation of the bridge arm circuit, but also when a short circuit occurs in the bridge arm circuit, the protection circuit can make the voltage difference between the drain and the source or the change amount of the drain-source current of the switch in the bridge arm circuit stabilized within the preset range, thereby improving the problem that the negative voltage output by the source of the switch in the bridge arm circuit is too small, resulting in too large a voltage difference of the switch in the bridge arm circuit and causing avalanche breakdown, and reducing the structural damage caused by the avalanche breakdown of the switch.

[0037] In an embodiment of the present application, the power supply terminal of the bridge arm circuit is used to connect to a power supply, and the control terminal of the bridge arm circuit is used to access a voltage control signal; the bridge arm circuit controls the on and off of the switch according to the power supply signal and the voltage control signal to obtain an on and off signal.

[0038] In an embodiment of the present application, the voltage of the power supply can be 16V or other values, which are not specifically limited herein. The voltage control signal can be a varying alternating current signal or a varying pulse signal, or multiple varying alternating current signals or multiple varying pulse signals. When the power supply powers the bridge arm circuit and the voltage control signal changes, it controls the on or off of the switching transistors in the bridge arm circuit. When the switching transistors are on or off, corresponding on-off signals are output.

[0039] In an embodiment of the present application, the protection circuit includes: a filter capacitor, and / or, a voltage-dividing resistor. The filter capacitor, and / or, the voltage-dividing resistor is / are arranged on the bridge arm circuit.

[0040] In an embodiment of the present application, if the protection circuit only includes a filter capacitor, one end of the filter capacitor is connected to the drain of the upper half-bridge switching transistor, and the other end of the filter capacitor is connected to the source of the lower half-bridge switching transistor; if the protection circuit only includes a voltage-dividing resistor, and the voltage-dividing resistor includes: an upper half-bridge voltage-dividing resistor and a lower half-bridge voltage-dividing resistor, the upper half-bridge voltage-dividing resistor is connected to the gate of the upper half-bridge switching transistor; the lower half-bridge voltage-dividing resistor is connected to the gate of the lower half-bridge switching transistor; if the protection circuit includes a voltage-dividing resistor and a filter capacitor, and the voltage-dividing resistor includes: an upper half-bridge voltage-dividing resistor and a lower half-bridge voltage-dividing resistor, then one end of the filter capacitor is connected to the drain of the upper half-bridge switching transistor, the other end of the filter capacitor is connected to the source of the lower half-bridge switching transistor, the upper half-bridge voltage-dividing resistor is connected to the gate of the upper half-bridge switching transistor; the lower half-bridge voltage-dividing resistor is connected to the gate of the lower half-bridge switching transistor.

[0041] In an embodiment of the present application, through the voltage stabilization characteristic and filtering characteristic of the filter capacitor, the voltage output at the source of the switching transistor in the bridge arm circuit is stabilized, thereby improving the problem that the negative voltage output at the source of the switching transistor in the bridge arm circuit is too small, resulting in an excessive drain-source voltage difference of the switching transistor in the bridge arm circuit and causing avalanche breakdown, and reducing the structural damage situation caused by the avalanche breakdown of the switching transistor; the voltage-dividing resistor has a voltage-dividing effect, reducing the current mutation caused by the change of the gate voltage of the switching transistor, thereby reducing the instantaneous current inside the switching transistor and slowing down the turn-off speed of the switching transistor, thus reducing the probability of the switching transistor being damaged by overcurrent.

[0042] In an embodiment of the present application, the bridge arm circuit includes:

[0043] Bridge arm circuits of different phases. Each phase bridge arm circuit includes: an upper half-bridge switching transistor and a lower half-bridge switching transistor. The drain of the upper half-bridge switching transistor is used to connect to the power supply. The gate of the upper half-bridge switching transistor is used to input the upper half-bridge voltage control signal. The source of the upper half-bridge switching transistor is connected to the drain of the lower half-bridge switching transistor. The gate of the lower half-bridge switching transistor is used to input the lower half-bridge voltage control signal. The source of the lower half-bridge switching transistor is used to be grounded through a grounding device.

[0044] Figure 3The circuit diagram of the drive protection module shown in an exemplary embodiment of the present application. As Figure 3 shown, the exemplary drive protection module includes: a bridge arm circuit and a grounding device. The grounding device can be a grounding resistor or a combination of a grounding resistor and an inductor, and specific limitations are not provided here. The bridge arm circuit includes different-phase bridge arm circuits. The different-phase bridge arm circuits include: a U-phase bridge arm circuit, a V-phase bridge arm circuit, and a W-phase bridge arm circuit. Among them, the U-phase bridge arm circuit includes: a first switching tube M1 (the upper half-bridge switching tube in the U-phase bridge arm circuit) and a second switching tube M2 (the lower half-bridge switching tube in the U-phase bridge arm circuit). The drain of the first switching tube M1 is used to connect to the power supply. The gate of the first switching tube M1 inputs a first voltage control signal UHG. The source of the first switching tube M1 is connected to the drain of the second switching tube M2. The gate of the second switching tube M2 inputs a second voltage control signal ULG. The source of the second switching tube M2 is used to be grounded through the grounding device; the V-phase bridge arm circuit includes: a third switching tube M3 (the upper half-bridge switching tube in the V-phase bridge arm circuit) and a fourth switching tube M4 (the lower half-bridge switching tube in the V-phase bridge arm circuit). The drain of the third switching tube M3 is used to connect to the power supply. The gate of the third switching tube M3 inputs a third voltage control signal VHG. The source of the third switching tube M3 is connected to the drain of the fourth switching tube M4. The gate of the fourth switching tube M4 inputs a fourth voltage control signal VLG. The source of the fourth switching tube M4 is used to be grounded through the grounding device; the W-phase bridge arm circuit includes: a fifth switching tube M5 (the upper half-bridge switching tube in the W-phase bridge arm circuit) and a sixth switching tube M6 (the lower half-bridge switching tube in the W-phase bridge arm circuit). The drain of the fifth switching tube M5 is used to connect to the power supply. The gate of the fifth switching tube M5 inputs a fifth voltage control signal WHG. The source of the fifth switching tube M5 is connected to the drain of the sixth switching tube M6. The gate of the sixth switching tube M6 inputs a sixth voltage control signal WLG. The source of the sixth switching tube M6 is used to be grounded through the grounding device.

[0045] In an embodiment of the present application, the first switching transistor M1, the second switching transistor M2, the third switching transistor M3, the fourth switching transistor M4, the fifth switching transistor M5, and the sixth switching transistor M6 are all selected as NMOS (N-Metal-Oxide-Semiconductor) transistors. The first voltage control signal UHG is a voltage control signal set for the gate of the upper half-bridge switching transistor in the U-phase bridge arm circuit, the second voltage control signal HLG is a voltage control signal set for the gate of the lower half-bridge switching transistor in the U-phase bridge arm circuit, the third voltage control signal VHG is a voltage control signal set for the gate of the upper half-bridge switching transistor in the V-phase bridge arm circuit, the fourth voltage control signal VLG is a voltage control signal set for the gate of the lower half-bridge switching transistor in the V-phase bridge arm circuit, the fifth voltage control signal WHG is a voltage control signal set for the gate of the upper half-bridge switching transistor in the W-phase bridge arm circuit, and the sixth voltage control signal WLG is a voltage control signal set for the gate of the lower half-bridge switching transistor in the W-phase bridge arm circuit.

[0046] In some embodiments of the present application, during use, the drains of the first switching transistor M1, the third switching transistor M3, and the fifth switching transistor M5 are all connected to the power supply, and the sources of the second switching transistor M2, the fourth switching transistor M4, and the sixth switching transistor M6 are all grounded through a grounding device. Under the combined action of the power supply, the first voltage control signal UHG, the second voltage control signal ULG, the third voltage control signal VHG, the fourth voltage control signal VLG, the fifth voltage control signal WHG, and the sixth voltage control signal WLG, the upper and lower half-bridge switching transistors in different phase bridge arm circuits are alternately turned on, thereby realizing the drive control of the brushless DC motor.

[0047] In an embodiment of the present application, one end of the filter capacitor is connected to the drain of the upper half-bridge switching transistor, and the other end of the filter capacitor is connected to the source of the lower half-bridge switching transistor.

[0048] In Figure 3 it, the drive protection module further includes filter capacitors, and the filter capacitors include: a first filter capacitor C7, one end of the first filter capacitor C7 is connected to the drain of the first switching transistor M1, and the other end of the first filter capacitor C7 is connected to the source of the second switching transistor M2; a second filter capacitor C8, one end of the second filter capacitor C8 is connected to the drain of the third switching transistor M3, and the other end of the second filter capacitor C8 is connected to the source of the fourth switching transistor M4; a third filter capacitor C9, one end of the third filter capacitor C9 is connected to the drain of the fifth switching transistor M5, and the other end of the third filter capacitor C9 is connected to the source of the sixth switching transistor M6.

[0049] In an embodiment of the present application, not only can the filter capacitor protect the switching transistors in the bridge arm circuit during the operation of the bridge arm circuit, but also when a short circuit occurs between the U-phase bridge arm circuit and the V-phase bridge arm circuit, the U-phase bridge arm circuit and the W-phase bridge arm circuit, or the V-phase bridge arm circuit and the W-phase bridge arm circuit in different-phase bridge arm circuits, through the voltage stabilization characteristic and filtering characteristic of the filter capacitor, the voltage difference between the power supply terminal of the upper half-bridge switching transistor and the ground terminal of the lower half-bridge switching transistor in each phase bridge arm circuit is stabilized, thereby stabilizing the output voltage of the switching transistor in each phase bridge arm circuit, and further improving the problem that the negative voltage output at the source of the switching transistor in each phase bridge arm circuit is too small, resulting in an excessive voltage difference between the drain and source of the switching transistor in each phase bridge arm circuit and causing avalanche breakdown, and reducing the structural damage caused by the avalanche breakdown of the switching transistor.

[0050] In an embodiment of the present application, the voltage-dividing resistor includes: an upper half-bridge voltage-dividing resistor and a lower half-bridge voltage-dividing resistor. The upper half-bridge voltage-dividing resistor is connected to the gate of the upper half-bridge switching transistor; the lower half-bridge voltage-dividing resistor is connected to the gate of the lower half-bridge switching transistor.

[0051] In Figure 3 the driving protection module further includes a voltage-dividing resistor, and the voltage-dividing resistor includes a first gate resistor R1 (the upper half-bridge voltage-dividing resistor in the U-phase bridge arm circuit), a second gate resistor R2 (the lower half-bridge voltage-dividing resistor in the U-phase bridge arm circuit), a third gate resistor R3 (the upper half-bridge voltage-dividing resistor in the V-phase bridge arm circuit), a fourth gate resistor R4 (the lower half-bridge voltage-dividing resistor in the V-phase bridge arm circuit), a fifth gate resistor R5 (the upper half-bridge voltage-dividing resistor in the W-phase bridge arm circuit), and a sixth gate resistor R6 (the lower half-bridge voltage-dividing resistor in the W-phase bridge arm circuit). The first gate resistor R1 is connected to the gate of the first switching transistor M1; the second gate resistor R2 is connected to the gate of the second switching transistor M2; the third gate resistor R3 is connected to the gate of the third switching transistor M3; the fourth gate resistor R4 is connected to the gate of the fourth switching transistor M4; the fifth gate resistor R5 is connected to the gate of the fifth switching transistor M5; the sixth gate resistor R6 is connected to the gate of the sixth switching transistor M6.

[0052] In some embodiments of the present application, not only can the gate resistor perform voltage-dividing protection on the switching transistors in the bridge arm circuit during the operation of the bridge arm circuit, but also when a short circuit occurs between the U-phase bridge arm circuit and the V-phase bridge arm circuit, the U-phase bridge arm circuit and the W-phase bridge arm circuit, or the V-phase bridge arm circuit and the W-phase bridge arm circuit in different-phase bridge arm circuits, the gate resistor has a voltage-dividing effect, reducing the current mutation caused by the change of the gate voltage of the switching transistor, thereby reducing the instantaneous current inside the switching transistor and slowing down the turn-off speed of the switching transistor, and thus reducing the probability of the switching transistor being damaged by overcurrent.

[0053] In an embodiment of the present application, the leg circuit further includes: an upper half-bridge gate-source voltage regulator device, one end of the upper half-bridge gate-source voltage regulator device is connected to the gate of the upper half-bridge switching device, and the other end of the upper half-bridge gate-source voltage regulator device is connected to the source of the upper half-bridge switching device; a lower half-bridge gate-source voltage regulator device, one end of the lower half-bridge gate-source voltage regulator device is connected to the gate of the lower half-bridge switching device, and the other end of the lower half-bridge gate-source voltage regulator device is connected to the source of the lower half-bridge switching device.

[0054] In Figure 3 , the drive protection module further includes a voltage regulator device, which can be a gate-source capacitor or a gate-source resistor. Among them, the gate-source capacitor includes: a first gate-source capacitor C1 (the upper half-bridge gate capacitor in the U-phase leg circuit), one end of the first gate-source capacitor C1 is connected to the gate of the first switching device M1, and the other end of the first gate-source capacitor C1 is connected to the source of the first switching device M1; a second gate-source capacitor C2 (the lower half-bridge gate capacitor in the U-phase leg circuit), one end of the second gate-source capacitor C2 is connected to the gate of the second switching device M2, and the other end of the second gate-source capacitor C2 is connected to the source of the second switching device M2; a third gate-source capacitor C3 (the upper half-bridge gate capacitor in the V-phase leg circuit), one end of the third gate-source capacitor C3 is connected to the gate of the third switching device M3, and the other end of the third gate-source capacitor C3 is connected to the source of the third switching device M3; a fourth gate-source capacitor C4 (the lower half-bridge gate capacitor in the V-phase leg circuit), one end of the fourth gate-source capacitor C4 is connected to the gate of the fourth switching device M4, and the other end of the fourth gate-source capacitor C4 is connected to the source of the fourth switching device M4; a fifth gate-source capacitor C5 (the upper half-bridge gate capacitor in the W-phase leg circuit), one end of the fifth gate-source capacitor C5 is connected to the gate of the fifth switching device M5, and the other end of the fifth gate-source capacitor C5 is connected to the source of the fifth switching device M5; a sixth gate-source capacitor C6 (the lower half-bridge gate capacitor in the W-phase leg circuit), one end of the sixth gate-source capacitor C6 is connected to the gate of the sixth switching device M6, and the other end of the sixth gate-source capacitor C6 is connected to the source of the sixth switching device M6.

[0055] In an embodiment of the present application, during the operation of the drive protection module, the gate-source capacitor can effectively reduce the fluctuation of the gate voltage of the switching device, reduce the risk of mis-conduction of the switching device, and reduce the influence of noise interference on the drive protection module, improving the stability and reliability of the operation of the drive protection module.

[0056] In an embodiment of the present application, the gate-source resistance includes: a first gate-source resistance (the upper-bridge gate resistance in the U-phase bridge arm circuit), one end of the first gate-source resistance is connected to the gate of the first switching transistor M1, and the other end of the first gate-source resistance is connected to the source of the first switching transistor M1; a second gate-source resistance (the lower-bridge gate capacitance in the U-phase bridge arm circuit), one end of the second gate-source resistance is connected to the gate of the second switching transistor M2, and the other end of the second gate-source resistance is connected to the source of the second switching transistor M2; a third gate-source resistance (the upper-bridge gate resistance in the V-phase bridge arm circuit), one end of the third gate-source resistance is connected to the gate of the third switching transistor M3, and the other end of the third gate-source resistance is connected to the source of the third switching transistor M3; a fourth gate-source resistance (the lower-bridge gate resistance in the V-phase bridge arm circuit), one end of the fourth gate-source resistance is connected to the gate of the fourth switching transistor M4, and the other end of the fourth gate-source resistance is connected to the source of the fourth switching transistor M4; a fifth gate-source resistance (the upper-bridge gate resistance in the W-phase bridge arm circuit), one end of the fifth gate-source resistance is connected to the gate of the fifth switching transistor M5, and the other end of the fifth gate-source resistance is connected to the source of the fifth switching transistor M5; a sixth gate-source resistance (the lower-bridge gate resistance in the W-phase bridge arm circuit), one end of the sixth gate-source resistance is connected to the gate of the sixth switching transistor M6, and the other end of the sixth gate-source resistance is connected to the source of the sixth switching transistor M6.

[0057] In an embodiment of the present application, during the operation of the drive protection module, the gate-source resistance can provide a bias voltage for the switching transistor and limit the magnitude of the gate current, preventing the switching transistor from being broken down due to excessive gate current. At the same time, the gate-source resistance can release the static electricity accumulated between the gate and the source of the switching transistor, avoiding an increase in the voltage drop between the gate and the source that may cause the switching transistor to malfunction or break down the gate-source structure of the switching transistor.

[0058] In an embodiment of the present application, during the operation of the drive protection module, the sources of the second switching transistor M2, the fourth switching transistor M4, and the sixth switching transistor M6 are all grounded through a grounding device R7, thereby achieving the functions of protecting the drive protection module and preventing electrostatic discharge.

[0059] In an embodiment of the present application, the drive protection module further includes a wire harness. Among them, the wire harness includes: a first wire harness, one end of the first wire harness is connected to the source of the first switching transistor M1, and the other end of the first wire harness is used to connect to the motor; a second wire harness, one end of the second wire harness is connected to the source of the third switching transistor M3, and the other end of the second wire harness is used to connect to the motor; a third wire harness, one end of the third wire harness is connected to the source of the fifth switching transistor M5, and the other end of the second wire harness is used to connect to the motor.

[0060] In an embodiment of the present application, during the operation of the drive protection module, when the first switch tube M1 or the second switch tube M2 in the U-phase bridge arm circuit is turned on, the first wire harness is used to transmit the U-phase drive signal. When the third switch tube M3 or the fourth switch tube M4 in the V-phase bridge arm circuit is turned on, the second wire harness is used to transmit the V-phase drive signal. When the fifth switch tube M5 or the sixth switch tube M6 in the W-phase bridge arm circuit is turned on, the third wire harness is used to transmit the W-phase drive signal, so as to realize transmitting the drive signal to the motor through the first wire harness, the second wire harness, and the third wire harness.

[0061] Figure 4 is the simulation circuit diagram of the drive protection module shown in an exemplary embodiment of the present application, as Figure 4 shown, the simulation circuit diagram of the drive protection module includes: reference circuit: the first switch tube U1 and the second switch tube U2. The drain of the first switch tube U1 is connected to the power supply. The first voltage control signal is input to the gate of the first switch tube U1 through the resistor R1. The gate of the first switch tube U1 is connected to one end of the resistor R2. The source of the first switch tube U1 is connected to the other end of the resistor R2. The source of the first switch tube U1 is grounded through the inductor L1 and the resistor R3. The source of the first switch tube U1 is connected to the drain of the second switch tube U2. The gate of the second switch tube U2 is grounded. The source of the second switch tube U2 is grounded through the inductor L2 and the resistor R4; first improvement circuit: the first switch tube T3 and the second switch tube T4. The drain of the first switch tube T3 is connected to the power supply. The first voltage control signal is input to the gate of the first switch tube T3 through the resistor R5. The gate of the first switch tube T3 is connected to one end of the resistor R6. The source of the first switch tube T3 is connected to the other end of the resistor R6. The source of the first switch tube T3 is grounded through the inductor L3 and the resistor R7. The source of the first switch tube T3 is connected to the drain of the second switch tube T4. The gate of the second switch tube T4 is grounded. The source of the second switch tube T4 is grounded through the inductor L4 and the resistor R8; second improvement circuit: the first switch tube T5 and the second switch tube T6. The drain of the first switch tube T5 is connected to the power supply. The first voltage control signal is input to the gate of the first switch tube T5 through the resistor R9. The gate of the first switch tube T5 is connected to one end of the resistor R10. The source of the first switch tube T5 is connected to the other end of the resistor R10. The source of the first switch tube T5 is grounded through the inductor L5 and the resistor R11. The source of the first switch tube T5 is connected to the drain of the second switch tube T6. The gate of the second switch tube T6 is grounded. The source of the second switch tube T6 is grounded through the inductor L6 and the resistor R12. One end of the capacitor C1 is connected to the drain of the first switch tube T5, and the other end of the capacitor C1 is connected to the source of the second switch tube T6.

[0062] In an embodiment of the present application, taking R as the reference value of the resistance, in the reference circuit, the resistance value of resistor R1 is set to 1R, in the first improved circuit, the resistance value of resistor R5 is set to 30R, and in the second improved circuit, the resistance value of resistor R9 is set to 1R. The capacitance of capacitor C1 is 220n.

[0063] Figure 5 It is the simulation result diagram of the drive protection module shown in an exemplary embodiment of the present application. As Figure 5 shown, the green curve is the output voltage vsh1 of the source of the first switching transistor U1 in the reference circuit changing with time. When a short circuit occurs in the reference circuit, that is, at time 5.0000128 ms, the output voltage vsh1 of the source of the first switching transistor U1 is -10.913854 V; the red curve is the output voltage vsh3 of the source of the first switching transistor T5 in the second improved circuit changing with time. When a short circuit occurs in the second improved circuit, that is, at time 5.0000128 ms, the output voltage vsh3 of the source of the first switching transistor T5 is -8.8808788 V; the blue curve is the output voltage vsh2 of the source of the first switching transistor T3 in the first improved circuit changing with time. When a short circuit occurs in the first improved circuit, the output voltage vsh2 of the source of the first switching transistor T3 drops relatively slowly, and there is no situation where the instantaneous current changes too much.

[0064] In an embodiment of the present application, by comparing the green curve and the red curve, it can be seen that by setting capacitor C1 between the drain of the first switching transistor T5 and the source of the second switching transistor T6, through the voltage stabilization characteristic and filtering characteristic of capacitor C1, the voltage difference between the drain of the first switching transistor T5 and the source of the second switching transistor T6 is stabilized, thereby stabilizing the output voltage of the source of the first switching transistor T5, and further improving the problem that the negative voltage output by the source of the first switching transistor T5 is too small, resulting in too large a voltage difference between the drain and source of the first switching transistor T5 and causing avalanche breakdown, and reducing the structural damage situation caused by the avalanche breakdown of the first switching transistor T5; by comparing the green curve and the blue curve, it can be seen that by connecting resistor R5 to the gate of the first switching transistor T3 and increasing the resistance value of resistor R5, the instantaneous change amount of the output voltage of the source of the first switching transistor T3 during short circuit can be effectively reduced, thereby reducing the instantaneous current in the circuit, and further slowing down the turn-off speed of the first switching transistor T3, avoiding the avalanche breakdown of the first switching transistor T3, and preventing the conduction phenomenon of the parasitic BJT (Bipolar Junction Transistor) of the first switching transistor T3 caused by the displacement current of the avalanche breakdown from the source, thereby avoiding the latch-up of the first switching transistor T3 and causing structural damage.

[0065] In an embodiment of the present application, the capacitance of capacitor C1 can be set to 100 nF to 330 nF, or can be adjusted according to the actual usage. The resistance value of resistor R5 can be set to 30 Ω to 50 Ω, or can be adjusted according to the actual usage, and no specific limitation is provided herein.

[0066] In an embodiment of the present application, the turn-off speed of the switching transistor can also be slowed down by reducing the turn-off current of the drive protection module. The turn-off current of the drive protection module can be set to 0 A to 0.2 A, or can be adjusted according to the actual usage, and no specific limitation is provided herein.

[0067] It should be noted that in actual application, the drive protection module provided in the above embodiment can allocate the above functions to different functional modules as needed, that is, divide the internal structure of the module into different circuit modules to complete all or part of the functions described above, and no limitation is provided herein.

[0068] The method embodiments of the present application are introduced below, which can be applied to the drive protection module in the above embodiments of the present application. For details not disclosed in the method embodiments of the present application, please refer to the embodiments of the drive protection module in the above of the present application.

[0069] Figure 6 is a schematic diagram of an exemplary system architecture shown in an exemplary embodiment of the present application. Referring to Figure 6 as shown, the system architecture may include a control device 601 and a motor driver 602. A person skilled in the art can use the motor driver 602 to control the on / off of the switching transistor according to the power supply signal and the voltage control signal to obtain an on / off signal, generate a drive signal for driving the motor to work according to the on / off signal, and, during the process of driving the motor to work, protect the switching transistor so that the drain-source voltage difference or the change amount of the drain-source current of the switching transistor is stabilized within a preset range. The control device 601 is used to issue a voltage control signal. In this embodiment, the control device 601 uses an error amplifier, a PWM (Pulse Width Modulation) controller, etc. to issue a voltage control signal and provide it to the motor driver 602 for processing.

[0070] Schematically, after the motor drive module 602 obtains the voltage control signal of the control device 601 and is powered by the power supply, it controls the on / off of the switching transistor according to the power supply signal and the voltage control signal to obtain an on / off signal, generates a drive signal for driving the motor to work according to the on / off signal, and, during the process of driving the motor to work, protects the switching transistor so that the drain-source voltage difference or the change amount of the drain-source current of the switching transistor is stabilized within a preset range. In the above process, not only can the protection circuit protect the switching transistors in the bridge arm circuit during the motor operation, but also when the bridge arm circuit has a short circuit, the protection circuit can make the drain-source voltage difference or the change amount of the drain-source current of the switching transistors in the bridge arm circuit stabilized within a preset range, thereby improving the problem that the negative voltage output at the source of the switching transistor in the bridge arm circuit is too small, resulting in an excessive voltage difference across the switching transistor in the bridge arm circuit and causing avalanche breakdown, and reducing the structural damage caused by the avalanche breakdown of the switching transistor.

[0071] It should be noted that the drive protection method provided by the embodiments of the present application is generally executed by the motor driver 602. Correspondingly, the drive protection module is generally arranged in the motor driver 602.

[0072] The implementation details of the technical solutions of the embodiments of the present application are elaborated in detail below:

[0073] Figure 7 is a flowchart of the drive protection method shown in an exemplary embodiment of the present application. The drive protection method can be executed by a computing processing device, and the computing processing device can be Figure 6 the motor driver 602 shown in. Referring to Figure 7 shown, the drive protection module at least includes steps S710 to S730, which are introduced in detail as follows:

[0074] In step S710, a power supply signal and a voltage control signal are obtained.

[0075] In an embodiment of the present application, when the power supply is powered, the power supply signal is a high level, and the high level can be represented by the value 1 or other values. When the voltage control signal can be 1 or 0, when the voltage control signal is 1, it means that the voltage control signal is a high level, and when the voltage control signal is 0, it means that the voltage control signal is a low level. The voltage control signal can also represent the high level and the low level through other values.

[0076] In step S720, according to the power supply signal and the voltage control signal, the on / off of the switching transistor is controlled to obtain an on / off signal.

[0077] In an embodiment of the present application, the voltage control signal can be a varying alternating current signal or a varying pulse signal, or can be multiple varying alternating current signals or multiple varying pulse signals. When the power supply powers the leg circuit and the voltage control signal changes, the switching tubes in the leg circuit are controlled to conduct or cut off. When the switching tubes conduct or cut off, corresponding on-off signals are output, and after the on-off signals are converted into drive signals, the drive signals are transmitted to the motor through a wire harness.

[0078] In step S730, a drive signal for driving the motor to operate is generated according to the on-off signal, and during the process of driving the motor to operate, the switching tubes are protected so that the drain-source voltage difference or the change amount of the drain-source current of the switching tubes is stabilized within a preset range.

[0079] In an embodiment of the present application, the preset range can be set according to actual situations and will not be specifically limited here. By providing a leg circuit for controlling the on-off of the switching tubes and generating a drive signal according to the on-off signal, and a protection circuit for protecting the switching tubes so that the drain-source voltage difference or the change amount of the drain-source current of the switching tubes is stabilized within a preset range, not only can the protection circuit protect the switching tubes in the leg circuit during the operation of the leg circuit, but also when the leg circuit has a short circuit, the protection circuit can make the drain-source voltage difference or the change amount of the drain-source current of the switching tubes in the leg circuit be stabilized within a preset range, thereby improving the problem that the negative voltage output at the source of the switching tube in the leg circuit is too small, resulting in an excessive voltage difference across the switching tube in the leg circuit and causing avalanche breakdown, and reducing the structural damage caused by the avalanche breakdown of the switching tubes.

[0080] It should be noted that the drive protection method provided in the above embodiment and the drive protection module provided in the above embodiment belong to the same concept. The specific manners in which each module and unit perform operations have been described in detail in the method embodiment and will not be elaborated here. In practical applications, the drive protection method provided in the above embodiment can, according to needs, allocate the above functions to different functional modules, that is, divide the internal structure of the device into different functional modules to complete all or part of the functions described above, and this will not be limited here either.

[0081] An embodiment of the present application further provides a motor driver, and the motor driver includes the drive protection module provided in each of the above embodiments.

[0082] On the other hand, the present application further provides a vehicle, and the vehicle includes the drive protection module provided in each of the above embodiments or the motor driver provided in each of the above embodiments.

[0083] Figure 8The figure shows a schematic structural diagram of a computer system suitable for implementing the image device of the embodiments of the present application. It should be noted that Figure 8 The computer system 800 of the image device shown is only an example and should not impose any limitations on the functions and usage scope of the embodiments of the present application.

[0084] As Figure 8 shown, the computer system 800 includes a central processing unit (CPU) 801, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 802 or the program loaded from the storage section 808 into the random access memory (RAM) 803, such as executing the method in the above embodiments. In the RAM 803, various programs and data required for system operation are also stored. The CPU 801, ROM 802, and RAM 803 are connected to each other via a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.

[0085] The following components are connected to the I / O interface 805: an input section 806 including a keyboard, a mouse, etc.; an output section 807 including, for example, a cathode ray tube (CRT), a liquid crystal display (LCD), etc. and a speaker, etc.; a storage section 808 including a hard disk, etc.; and a communication section 809 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section 809 performs communication processing via a network such as the Internet. A drive 810 is also connected to the I / O interface 805 as needed. A removable medium 811, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 810 as needed so that a computer program read from it can be installed into the storage section 808 as needed.

[0086] Specifically, according to the embodiments of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments of the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication section 809, and / or installed from the removable medium 811. When the computer program is executed by the central processing unit (CPU) 801, various functions defined in the system of the present application are executed.

[0087] It should be noted that the computer-readable medium shown in the embodiments of the present application can be a computer-readable signal medium, a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable computer program. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium can be transmitted by any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0088] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present application. Among them, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code, and the above module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order from that marked in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram or flowchart, and the combination of blocks in the block diagram or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0089] The units involved in the embodiments described in this application can be implemented in software or in hardware, and the described units can also be provided in a processor. Among them, the names of these units do not constitute a limitation to the unit itself in some cases.

[0090] It should be noted that although several modules or units of a device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of this application, the features and functions of the two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0091] Through the description of the above embodiments, those skilled in the art can easily understand that the example embodiments described here can be implemented by software or by a combination of software and necessary hardware. Therefore, the technical solutions according to the embodiments of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (such as a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the embodiments of this application.

[0092] After considering the specification and practicing the embodiments disclosed herein, those skilled in the art will readily conceive of other embodiments of this application. This application is intended to cover any variations, uses, or adaptations of this application, which follow the general principles of this application and include common general knowledge or conventional technical means in the technical field not disclosed in this application.

[0093] It should be understood that the above content is only a preferred exemplary embodiment of this application and is not used to limit the implementation of this application. Those of ordinary skill in the art can make corresponding adaptations or modifications very conveniently according to the main concept and spirit of this application. Therefore, the protection scope of this application should be subject to the protection scope required by the claims.

Claims

1. A drive protection module, characterized in that: include: The bridge arm circuit is used to control the on and off of the switch tube and generate a driving signal for driving the motor according to the on and off signal; The protection circuit is used to protect the switch tube so that the drain-source voltage difference or the drain-source current variation of the switch tube is stabilized within a preset range.

2. The drive protection module according to claim 1, characterized in that: The power supply end of the bridge arm circuit is used to connect to a power supply, and the control end of the bridge arm circuit is used to access a voltage control signal; The bridge arm circuit controls the on-off of the switch tube according to the power supply signal and the voltage control signal to obtain the on-off signal.

3. The driving protection module according to claim 1, characterized in that: The protection circuit comprises: Filter capacitors and / or voltage divider resistors, The filter capacitor and / or the voltage-dividing resistor are arranged on the bridge arm circuit.

4. The driving protection module according to claim 3, characterized in that: The bridge arm circuit comprises: Different phase bridge arm circuits, each phase bridge arm circuit includes: an upper half-bridge switch tube and a lower half-bridge switch tube, the drain of the upper half-bridge switch tube is used to connect to the power supply, the gate of the upper half-bridge switch tube is used to input the upper half-bridge voltage control signal, the source of the upper half-bridge switch tube is connected to the drain of the lower half-bridge switch tube, the gate of the lower half-bridge switch tube is used to input the lower half-bridge voltage control signal, and the source of the lower half-bridge switch tube is used to be grounded through a grounding device.

5. The driving protection module according to claim 4, characterized in that: One end of the filter capacitor is connected to the drain of the upper half-bridge switch tube, and the other end of the filter capacitor is connected to the source of the lower half-bridge switch tube.

6. The driving protection module according to claim 4, characterized in that: The voltage-dividing resistors include: an upper half-bridge voltage-dividing resistor and a lower half-bridge voltage-dividing resistor. The upper half-bridge voltage-dividing resistor is connected to the gate of the upper half-bridge switch tube; The lower half-bridge voltage-dividing resistor is connected to the gate of the lower half-bridge switch tube.

7. The driving protection module according to claim 4, characterized in that: The bridge arm circuit also includes: An upper half-bridge gate-source voltage stabilizing device, one end of which is connected to the gate of the upper half-bridge switch tube, and the other end of which is connected to the source of the upper half-bridge switch tube; A lower half-bridge gate-source voltage stabilizing device, one end of which is connected to the gate of the lower half-bridge switch tube, and the other end of which is connected to the source of the lower half-bridge switch tube.

8. A drive protection method, characterized in that: include: Obtaining power supply signal and voltage control signal; According to the power supply signal and the voltage control signal, the on / off of the switch tube is controlled to obtain an on / off signal; A driving signal for driving the motor is generated according to the on-off signal, and in the process of driving the motor, the switch tube is protected so that the drain-source voltage difference or the drain-source current change of the switch tube is stabilized within a preset range.

9. A motor driver, characterized in that: The motor driver comprises a drive protection module as described in claims 1-7.

10. A vehicle, characterized in that: The vehicle comprises the drive protection module according to claims 1-7 or the motor drive according to claim 9.

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