Power supply circuit, motor controller and vehicle

Abstract

The invention provides a power supply circuit, a motor controller and a vehicle, and the power supply circuit comprises a high-voltage auxiliary power supply, a low-voltage power supply, a logic circuit, and a trailer protection circuit. The trailer protection circuit is connected with the logic circuit, when the output end of the trailer protection circuit has voltage, the logic circuit outputs an ASC enable signal, and when the output end of the trailer protection circuit has no voltage, the logic circuit does not output the ASC enable signal; the trailer protection circuit comprises a first enabling unit, a second enabling unit and a switch unit, and the first enabling unit is used for outputting a conduction enabling signal to the switch unit when a low-voltage power supply is powered on; and the output end of the second enabling unit is connected with the input end of the switch unit, and the second enabling unit is used for inputting a conduction enabling signal to the switch unit based on the high-voltage auxiliary power supply. On the premise that the vehicle can normally trigger the ASC state in the normal driving process, the vehicle can be prevented from entering the ASC state in the vehicle dragging process.

Description

Technical Field

[0001] The present application relates to the field of motor controllers, and in particular, to a power supply circuit, a motor controller and a vehicle. Background Art

[0002] The electric drive system of electric vehicles is mainly composed of a drive motor, an inverter and a high-voltage battery. The motor controller is a device that controls the energy transmission between the power supply and the drive motor, and is the core of the motor drive and control system. It obtains the needs of the vehicle from the vehicle controller and obtains electrical energy from the power battery. After modulation by its own inverter, it converts the DC power of the power battery into AC power and provides it to the drive motor, so that the speed and torque of the drive motor meet the acceleration, deceleration, braking, parking and other requirements of the vehicle.

[0003] The typical safety state of the motor controller is ASC (active short circuit of the motor's three-phase windings). The purpose of the motor entering active short circuit is to prevent the induced back electromotive force from being too high under high speed conditions, and then the bus capacitor is charged after the uncontrolled rectification of the three-phase full-bridge electronic control. When the voltage is charged to a certain level, it will exceed the withstand voltage of the electronic control components and damage the electronic control.

[0004] Furthermore, the current working input voltage range of the high-voltage auxiliary power supply is generally 60V-1000V, so as long as the voltage of the high-voltage battery is detected to be greater than 60V, the high-voltage power supply will start. If the high voltage is greater than 60V and the low voltage is not powered on, the general motor controller will enter the motor winding active short circuit state. Further, when the vehicle is powered off (i.e., the vehicle's low-voltage system is not powered on), if the vehicle is towed forward or backward by a trailer, the motor will have a rotation speed, and the motor winding will induce a certain voltage. If the induced voltage is greater than 60V, the high-voltage power supply will start. Since the low-voltage system of the whole vehicle is not powered on at this time, the motor controller will automatically enter the motor winding active short circuit state. If the vehicle is towed and the motor is driven into the three-phase active short circuit state, the current generated by the active short circuit of the motor is very large. This current has been circulating between the motor controller and the motor winding. Especially in the absence of cooling, the large amount of heat generated will soon burn the motor controller and the motor.

[0005] In order to deal with the above situation, new energy vehicles have special restrictions when towing. Generally, it is not allowed to tow without power, or the towing vehicle is not allowed to tow the drive wheels, and the drive wheels need to be lifted before towing.

[0006] However, there is no guarantee that users or towing personnel are fully aware of this towing regulation. If the towing personnel are unaware (and the probability is extremely high) and the vehicle is towed, there is a high probability that the vehicle will be damaged. Summary of the invention

[0007] The purpose of the embodiments of the present application is to provide a power supply circuit, a motor controller and a vehicle, so as to prevent the vehicle from entering the ASC state during the towing process, while ensuring that the ASC state can be triggered normally during normal driving of the vehicle.

[0008] In a first aspect, the present invention provides a power supply circuit, comprising: a high-voltage auxiliary power supply, a low-voltage power supply, a logic circuit, and a trailer protection circuit;

[0009] The trailer protection circuit is connected to the logic circuit. When there is voltage at the output end of the trailer protection circuit, the logic circuit works. When there is no voltage at the output end of the trailer protection circuit, the logic circuit does not work.

[0010] The trailer protection circuit includes a first enabling unit, a second enabling unit, and a switch unit;

[0011] The input end of the switch unit is connected to the high-voltage auxiliary power supply;

[0012] The input end of the first enabling unit is connected to the low-voltage power supply, the output end of the first enabling unit is connected to the switch unit, and the first enabling unit is used to output a conduction enable signal to the switch unit when the low-voltage power supply is powered on;

[0013] The input end of the second enabling unit is connected to the output end of the switch unit, the output end of the second enabling unit is connected to the input end of the switch unit, and the second enabling unit is used to input a conduction enable signal to the switch unit based on the high-voltage auxiliary power supply.

[0014] The power supply circuit of the present application can utilize the characteristic that the low-voltage power supply of the vehicle is not powered on during the vehicle towing process, so that the trailer protection circuit cannot supply power to the logic circuit, and the logic circuit cannot generate an ASC enable signal, thereby preventing the vehicle from triggering the ASC state during the vehicle towing process, thereby preventing the high heat generated by the ASC state from damaging the motor and the motor controller. On the other hand, during the normal driving of the vehicle, if the low-voltage power supply of the vehicle is powered off, at this time, the high-voltage auxiliary power trigger switch unit can be turned on through the second enabling unit, and then the trailer protection circuit supplies power to the logic circuit, so that the logic circuit generates an ASC enable signal, and finally ensures that the ASC state can be normally triggered during the normal driving process of the vehicle.

[0015] In an optional embodiment, the trailer protection circuit further includes a buck regulator;

[0016] The input end of the buck regulator is connected to the output of the high-voltage auxiliary power supply, the output end of the buck regulator is connected to the input end of the switch unit, and the buck regulator is used to step down and stabilize the low-voltage side voltage output by the high-voltage auxiliary power supply.

[0017] This optional implementation can step down and stabilize the low-voltage side voltage output by the high-voltage auxiliary power supply through a step-down regulator.

[0018] In an optional embodiment, the switch unit includes a first MOS switch and a second MOS switch;

[0019] The input end of the first MOS switch is connected to the output end of the first enabling unit and to the output end of the second enabling unit, and the output end of the first MOS switch is connected to the input end of the second MOS switch;

[0020] The input end of the second MOS switch is also connected to the high-voltage auxiliary power supply, wherein, when the first MOS switch is in a conductive state under the enabling action of the first enabling unit or the second enabling unit, the first MOS switch outputs a conductive enable signal to the second MOS switch, so that the second MOS switch is in a conductive state.

[0021] This optional implementation can control whether the trailer protection unit outputs a voltage through the first MOS switch and the second MOS switch, thereby controlling whether the logic circuit generates an ASC enable signal.

[0022] In an optional implementation, the buck regulator is used to step down and stabilize the 8V voltage into a 5V voltage.

[0023] This optional implementation can step down and stabilize the 8V voltage into a 5V voltage.

[0024] In an optional embodiment, the power supply circuit also includes a lower bridge isolation driver, wherein the lower bridge isolation driver is connected to the logic circuit, wherein the lower bridge isolation driver is used to enable the motor controller to control the vehicle to enter the ASC state after receiving the ASC enable signal output by the logic circuit.

[0025] This optional implementation can enable the motor controller to control the vehicle to enter the ASC state through the lower bridge isolation driver after the logic circuit outputs the ASC enable signal.

[0026] In an optional embodiment, the lower bridge isolation driver is also connected to the low-voltage power supply and the high-voltage auxiliary power supply, wherein the low-voltage power supply and the high-voltage auxiliary power supply supply power the low-voltage side of the lower bridge isolation driver, the low-voltage power supply and the high-voltage auxiliary power back up each other, and the high-voltage side of the lower bridge isolation driver is powered by the high-voltage auxiliary power supply.

[0027] This optional implementation enables the low-voltage side (primary side) of the lower bridge isolation driver to have two power supplies, and the two power supplies back up each other to ensure that any one of the power supplies can power the circuit. On the other hand, the power supply of the high-voltage side (secondary side) of the lower bridge isolation driver is completely powered by the high-voltage auxiliary power supply. Compared with the existing technology (the high-voltage side is also powered by two power supplies at the same time), this optional implementation does not need to be powered by the low-voltage battery of the vehicle, thereby simplifying the power architecture of the system and ensuring the integrity of the system functions.

[0028] In an optional embodiment, the power supply circuit further includes an upper bridge isolation driver, an upper bridge driving power supply and a low-voltage power supply module, wherein the low-voltage power supply module is powered by a low-voltage battery, and the low-voltage side of the upper bridge isolation driver is connected to the low-voltage battery and the low-voltage power supply, wherein the low-voltage battery and the low-voltage power supply supply power the low-voltage side of the upper bridge isolation driver;

[0029] The high voltage side of the upper bridge isolation driver is connected to the upper bridge driving power supply, wherein the upper bridge driving power supply supplies power to the high voltage side of the upper bridge isolation driver.

[0030] This optional implementation manner can supply power to the upper bridge isolation driver through a low-voltage battery, the low-voltage power supply, and the upper bridge drive power supply.

[0031] In an optional implementation, the upper bridge driving power supply is used to convert the low voltage output by the low voltage battery into a high voltage side power supply through isolation to supply power to the high voltage side of the upper bridge isolation driver.

[0032] In a second aspect, the present invention provides a motor controller, comprising a power supply circuit as described in any one of the aforementioned embodiments.

[0033] The motor controller of the present application can utilize the characteristic that the low-voltage power supply of the vehicle is not powered on during the vehicle towing process, so that the trailer protection circuit cannot supply power to the logic circuit, and the logic circuit cannot generate an ASC enable signal, thereby preventing the vehicle from triggering the ASC state during the vehicle towing process, thereby preventing the high heat generated by the ASC state from damaging the motor and the motor controller. On the other hand, during the normal driving of the vehicle, if the low-voltage power supply of the vehicle is powered off, at this time, the high-voltage auxiliary power trigger switch unit can be turned on through the second enabling unit, and then the trailer protection circuit supplies power to the logic circuit, so that the logic circuit generates an ASC enable signal, and finally ensures that the ASC state can be normally triggered during the normal driving process of the vehicle.

[0034] In a third aspect, the present invention provides a vehicle, comprising a motor controller as described in the above embodiment.

[0035] The vehicle of the present application can, during the towing process, take advantage of the fact that the low-voltage power supply of the vehicle is not powered on, so that the trailer protection circuit cannot supply power to the logic circuit, and thus the logic circuit cannot generate an ASC enable signal, thereby preventing the vehicle from triggering the ASC state during the vehicle towing process, thereby preventing the high heat generated by the ASC state from damaging the motor and the motor controller. On the other hand, during the normal driving of the vehicle, if the low-voltage power supply of the vehicle is powered off, at this time, the high-voltage auxiliary power supply trigger switch unit can be turned on through the second enabling unit, thereby enabling the trailer protection circuit to supply power to the logic circuit, so that the logic circuit generates an ASC enable signal, and finally ensuring that the ASC state can be normally triggered during the normal driving of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a schematic diagram of the architecture of a power supply circuit disclosed in an embodiment of the present application;

[0038] Figure 2 It is a schematic diagram of a trailer protection circuit disclosed in an embodiment of the present application.

[0039] Icons: a first enabling unit 20 , a second enabling unit 30 , a first MOS switch 40 , a second MOS switch 50 , and a buck regulator 60 . DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0041] Example

[0042] See also Figure 1 , Figure 1 Schematic diagram of a power supply circuit disclosed in an embodiment of the present application. Figure 1 As shown, the power supply circuit of the embodiment of the present application includes: a high-voltage auxiliary power supply, a low-voltage power supply, a logic circuit and a trailer protection circuit. The trailer protection circuit is connected to the logic circuit. When there is voltage at the output end of the trailer protection circuit, the logic circuit outputs an ASC enable signal. When there is no voltage at the output end of the trailer protection circuit, the logic circuit does not output an ASC enable signal.

[0043] Further, in order to realize that when there is voltage at the output end of the trailer protection circuit, the logic circuit works, and when there is no voltage at the output end of the trailer protection circuit, the logic circuit does not work, please refer to Figure 2 , Figure 2 Schematic diagram of a trailer protection circuit disclosed in an embodiment of the present application. Figure 2 As shown, the trailer protection circuit includes a first enabling unit 20, a second enabling unit 30, and a switch unit, wherein an input end of the switch unit is connected to a high-voltage auxiliary power supply, an input end of the first enabling unit is connected to a low-voltage power supply, an output end of the first enabling unit is connected to the switch unit, and the first enabling unit is used to output a conduction enable signal to the switch unit when the low-voltage power supply is powered on, an input end of the second enabling unit is connected to an output end of the switch unit, an output end of the second enabling unit is connected to an input end of the switch unit, and the second enabling unit is used to input a conduction enable signal to the switch unit based on the high-voltage auxiliary power supply.

[0044] The power supply circuit of the embodiment of the present application can, during the process of towing the vehicle, take advantage of the fact that the low-voltage power supply of the vehicle is not powered on during the process of towing the vehicle, so that the trailer protection circuit cannot supply power to the logic circuit, and thus the logic circuit cannot generate an ASC enable signal, thereby preventing the vehicle from triggering the ASC state during the process of towing the vehicle, thereby preventing the high heat generated by the ASC state from damaging the motor and the motor controller. On the other hand, during the normal driving of the vehicle, if the low-voltage power supply of the vehicle is powered off, at this time, the high-voltage auxiliary power supply trigger switch unit can be turned on through the second enabling unit, thereby enabling the trailer protection circuit to supply power to the logic circuit, so that the logic circuit generates an ASC enable signal, and finally ensuring that the ASC state can be normally triggered during the normal driving of the vehicle.

[0045] In an optional embodiment, the trailer protection circuit further includes a buck regulator 60;

[0046] The input end of the buck regulator is connected to the output of the high-voltage auxiliary power supply, the output end of the buck regulator is connected to the input end of the switch unit, and the buck regulator is used to step down and stabilize the low-voltage side voltage output by the high-voltage auxiliary power supply.

[0047] This optional implementation can step down and stabilize the low-voltage side voltage output by the high-voltage auxiliary power supply through a step-down regulator.

[0048] In an optional embodiment, the switch unit includes a first MOS switch 40 and a second MOS switch 50, the input end of the first MOS switch is connected to the output end of the first enabling unit and to the output end of the second enabling unit, and the output end of the first MOS switch is connected to the input end of the second MOS switch;

[0049] The input end of the second MOS switch is also connected to the high-voltage auxiliary power supply, wherein, when the first MOS switch is in a conductive state under the enabling action of the first enabling unit or the second enabling unit, the first MOS switch outputs a conductive enable signal to the second MOS switch, so that the second MOS switch is in a conductive state.

[0050] This optional implementation can control whether the trailer protection unit outputs a voltage through the first MOS switch and the second MOS switch, thereby controlling whether the logic circuit generates an ASC enable signal.

[0051] In the embodiment of the present application, the trailer protection circuit outputs a high-voltage auxiliary power supply to the low-voltage side through a buck regulator LDO to stabilize the voltage supplied to the low-voltage side to a typical voltage (taking 5V as an example), and then outputs it to the outside through the second MOS switch, and the output voltage is the output voltage of the trailer protection circuit. Furthermore, there are two enabling conditions for the first MOS switch, one is the output voltage enable of the low-voltage power module, and the other is the output voltage enable of the trailer protection circuit, wherein any one of the enabling conditions is met, the first MOS switch can be switched from cut-off to on.

[0052] Furthermore, for the working condition of normal vehicle driving, the low-voltage power supply module is powered on before the vehicle drives normally. For example, the vehicle needs to be started before the vehicle drives normally. At this time, when the low-voltage power supply module is powered on, the low-voltage power supply module turns on the first MOS switch, and then the first MOS switch outputs a voltage to the second MOS switch, turning on the second MOS switch. When the second MOS switch is turned on, the voltage provided by the high-voltage auxiliary power supply can be output through the second MOS switch, that is, the voltage provided by the high-voltage auxiliary power supply can be used as the output voltage of the trailer protection circuit, and the logic circuit outputs the ASC enable signal, and then when the motor controller detects the ASC enable signal, it controls the three-phase active short circuit of the motor.

[0053] Furthermore, if an abnormal fault occurs during normal driving of the vehicle and the low-voltage power supply module is powered off, at this time, since the second MOS switch is still in the on state before the low-voltage power supply module is powered off, the voltage provided by the high-voltage auxiliary power supply can be used as the enable signal of the first MOS switch through the second MOS switch, so that the first MOS switch continues to remain in the on state, thereby maintaining the on state of the second MOS switch, so that the trailer protection circuit can supply power to the logic circuit normally, so that the logic circuit can generate an ASC enable signal when an abnormal fault is detected, thereby avoiding the inability to generate the ASC enable signal due to the logic circuit not being powered on.

[0054] On the other hand, under the towing condition, since the vehicle is not powered on during towing, the first enabling unit cannot turn on the first MOS switch, and the second MOS switch is in the off state. As a result, there is no output voltage at the output end of the trailer protection circuit, and the logic circuit cannot be powered on. As a result, the logic circuit cannot generate an ASC enable signal, and the controller cannot enter the active short-circuit state of the motor winding, thereby avoiding the situation where the trailer ASC damages the electronic control.

[0055] In the embodiment of the present application, when there is no voltage at the output end of the trailer protection circuit, the logic circuit does not output the ASC enable signal, which means that the logic circuit cannot be powered and cannot work, and thus cannot generate the ASC enable signal.

[0056] In the embodiment of the present application, the first MOS switch and the second MOS switch may be P-MOS switches.

[0057] In the embodiment of the present application, the ASC enable signal is used to enable the motor to enter a three-phase active state.

[0058] In an optional implementation, the buck regulator is used to step down and stabilize the 8V voltage into a 5V voltage.

[0059] This optional implementation can step down and stabilize the 8V voltage into a 5V voltage.

[0060] In an optional embodiment, the power supply circuit also includes a lower bridge isolation driver, wherein the lower bridge isolation driver is connected to the logic circuit, wherein the lower bridge isolation driver is used to enable the motor controller to control the vehicle to enter the ASC state after receiving an ASC enable signal output by the logic circuit.

[0061] This optional implementation can enable the motor controller to control the vehicle to enter the ASC state through the lower bridge isolation driver after the logic circuit outputs the ASC enable signal.

[0062] In an optional embodiment, the lower bridge isolation driver is also connected to a low voltage power supply and a high voltage auxiliary power supply, wherein the low voltage power supply and the high voltage auxiliary power supply supply power the low voltage side of the lower bridge isolation driver, the low voltage power supply and the high voltage auxiliary power back up each other, and the high voltage side of the lower bridge isolation driver is powered by the high voltage auxiliary power supply.

[0063] This optional implementation enables the low-voltage side (primary side) of the lower bridge isolation driver to have two power supplies, and the two power supplies back up each other to ensure that any one of the power supplies can power the circuit. On the other hand, the power supply of the high-voltage side (secondary side) of the lower bridge isolation driver is completely powered by the high-voltage auxiliary power supply. Compared with the existing technology (the high-voltage side is also powered by two power supplies at the same time), this optional implementation does not need to be powered by the low-voltage battery of the vehicle, thereby simplifying the power architecture of the system and ensuring the integrity of the system functions.

[0064] In an alternative embodiment, the power circuit

[0065] It also includes an upper bridge isolation driver, an upper bridge driving power supply and a low-voltage power supply module, wherein the low-voltage power supply module is powered by a low-voltage battery, and the low-voltage side of the upper bridge isolation driver is connected to the low-voltage battery and the low-voltage power supply, wherein the low-voltage battery and the low-voltage power supply supply supply power to the low-voltage side of the upper bridge isolation driver;

[0066] The high voltage side of the upper bridge isolation driver is connected to the upper bridge driving power supply, wherein the upper bridge driving power supply supplies power to the high voltage side of the upper bridge isolation driver.

[0067] This optional implementation manner can supply power to the upper bridge isolation driver through a low-voltage battery, a low-voltage power supply, and an upper bridge drive power supply.

[0068] In an optional implementation, the upper bridge driving power supply is used to convert the low voltage output by the low voltage battery into a high voltage side power supply through isolation to supply power to the high voltage side of the upper bridge isolation driver.

[0069] In addition, an embodiment of the present application also discloses a motor controller, comprising a power supply circuit as described in any of the aforementioned implementations.

[0070] The motor controller of the embodiment of the present application can, during the process of towing the vehicle, take advantage of the fact that the low-voltage power supply of the vehicle is not powered on during the process of towing the vehicle, so that the trailer protection circuit cannot supply power to the logic circuit, and thus the logic circuit cannot generate an ASC enable signal, thereby preventing the vehicle from triggering the ASC state during the process of towing the vehicle, thereby preventing the high heat generated by the ASC state from damaging the motor and the motor controller. On the other hand, during the normal driving of the vehicle, if the low-voltage power supply of the vehicle is powered off, at this time, the high-voltage auxiliary power supply trigger switch unit can be turned on through the second enabling unit, thereby enabling the trailer protection circuit to supply power to the logic circuit, so that the logic circuit generates an ASC enable signal, and finally ensuring that the ASC state can be normally triggered during the normal driving of the vehicle.

[0071] Furthermore, an embodiment of the present application also provides a vehicle, which includes a motor controller as described in the aforementioned embodiment.

[0072] The vehicle of the present application can, during the towing process, take advantage of the fact that the low-voltage power supply of the vehicle is not powered on, so that the trailer protection circuit cannot supply power to the logic circuit, and thus the logic circuit cannot generate an ASC enable signal, thereby preventing the vehicle from triggering the ASC state during the vehicle towing process, thereby preventing the high heat generated by the ASC state from damaging the motor and the motor controller. On the other hand, during the normal driving of the vehicle, if the low-voltage power supply of the vehicle is powered off, at this time, the high-voltage auxiliary power trigger switch unit can be turned on through the second enabling unit, thereby enabling the trailer protection circuit to supply power to the logic circuit, so that the logic circuit generates an ASC enable signal, and finally ensuring that the ASC state can be normally triggered during the normal driving of the vehicle.

[0073] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0074] In addition, the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0075] Furthermore, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0076] It should be noted that if the function is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk.

[0077] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0078] The above are only embodiments of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A power supply circuit, characterized in that: include: High voltage auxiliary power supply, low voltage power supply, logic circuit and trailer protection circuit; The trailer protection circuit is connected to the logic circuit. When there is voltage at the output end of the trailer protection circuit, the logic circuit works. When there is no voltage at the output end of the trailer protection circuit, the logic circuit does not work. The trailer protection circuit includes a first enabling unit, a second enabling unit, and a switch unit; The input end of the switch unit is connected to the high-voltage auxiliary power supply; The input end of the first enabling unit is connected to the low-voltage power supply, the output end of the first enabling unit is connected to the switch unit, and the first enabling unit is used to output a conduction enable signal to the switch unit when the low-voltage power supply is powered on; The input end of the second enabling unit is connected to the output end of the switch unit, the output end of the second enabling unit is connected to the input end of the switch unit, and the second enabling unit is used to input a conduction enable signal to the switch unit based on the high-voltage auxiliary power supply.

2. The power supply circuit according to claim 1, characterized in that The trailer protection circuit also includes a buck regulator; The input end of the buck regulator is connected to the output of the high-voltage auxiliary power supply, the output end of the buck regulator is connected to the input end of the switch unit, and the buck regulator is used to step down and stabilize the low-voltage side voltage output by the high-voltage auxiliary power supply.

3. The power supply circuit according to claim 1, characterized in that The switch unit includes a first MOS switch and a second MOS switch; The input end of the first MOS switch is connected to the output end of the first enabling unit and to the output end of the second enabling unit, and the output end of the first MOS switch is connected to the input end of the second MOS switch; The input end of the second MOS switch is also connected to the high-voltage auxiliary power supply, wherein, when the first MOS switch is in a conductive state under the enabling action of the first enabling unit or the second enabling unit, the first MOS switch outputs a conductive enable signal to the second MOS switch, so that the second MOS switch is in a conductive state.

4. The power supply circuit according to claim 1, characterized in that: The step-down regulator is used to step down and stabilize the 8V voltage into a 5V voltage.

5. The power supply circuit according to claim 1, characterized in that: It also includes a lower bridge isolation driver, wherein the lower bridge isolation driver is connected to the logic circuit, wherein the lower bridge isolation driver is used to enable the motor controller to control the vehicle to enter the ASC state after receiving the ASC enable signal output by the logic circuit.

6. The power supply circuit according to claim 5, characterized in that: The lower bridge isolation driver is also connected to the low voltage power supply and the high voltage auxiliary power supply, wherein the low voltage power supply and the high voltage auxiliary power supply supply power the low voltage side of the lower bridge isolation driver, the low voltage power supply and the high voltage auxiliary power serve as backup for each other, and the high voltage side of the lower bridge isolation driver is powered by the high voltage auxiliary power supply.

7. The power supply circuit according to claim 6, characterized in that: It also includes an upper bridge isolation driver, an upper bridge driving power supply and a low-voltage power supply module, wherein the low-voltage power supply module is powered by a low-voltage battery, and the low-voltage side of the upper bridge isolation driver is connected to the low-voltage battery and the low-voltage power supply, wherein the low-voltage battery and the low-voltage power supply supply supply power to the low-voltage side of the upper bridge isolation driver; The high voltage side of the upper bridge isolation driver is connected to the upper bridge driving power supply, wherein the upper bridge driving power supply supplies power to the high voltage side of the upper bridge isolation driver.

8. The power supply circuit according to claim 7, characterized in that: The upper bridge driving power supply is used to convert the low voltage output by the low voltage battery into a high voltage side power supply through isolation to supply power to the high voltage side of the upper bridge isolation driver.

9. A motor controller, characterized in that: The invention comprises a power supply circuit as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: The vehicle includes the motor controller of claim 9.

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