Motor controller driving power supply and control method

Abstract

The invention relates to the technical field of power supplies, and discloses a motor controller driving power supply and a control method, the driving power supply comprises a main controller, a power supply management unit, a plurality of overcurrent protection circuits, an upper bridge driving power supply circuit and a lower bridge driving power supply circuit; wherein the main controller is respectively connected with the power management unit, the plurality of overcurrent protection circuits, the upper bridge driving power supply circuit and the lower bridge driving power supply circuit; the input end of the power management unit is connected with an input power supply, and the output end of the power management unit is respectively connected with the plurality of overcurrent protection circuits; and the output ends of the plurality of overcurrent protection circuits are respectively connected with each bridge arm circuit in the upper bridge driving power supply circuit and the lower bridge driving power supply circuit, so that the main controller controls and outputs a plurality of paths of independent driving power supplies. The motor controller driving power supply is provided with a plurality of paths of independent driving power supplies, so that the upper three-bridge-arm and lower three-bridge-arm six-path driving power supplies of the upper bridge driving power supply circuit and the lower bridge driving power supply circuit independently control power supply and do not interfere with each other.

Description

Technical Field

[0001] This invention belongs to the field of power supply technology, and specifically relates to a motor controller drive power supply and control method. Background Technology

[0002] With the development of new energy vehicles, the safety requirements for vehicles are becoming increasingly stringent. When the controller's low-voltage power supply or the drive power supply load is abnormal, a backup power supply is needed to power the hardware circuits that execute the ASC (Active Short-Circuit) safety state, including the active short-circuit safety control logic circuit and drive circuit, to ensure the execution of safe torque shutdown and thus ensure the torque safety of the entire vehicle and the safety of the high-voltage battery system. Most existing drive power supply architectures employ push-pull power supply topologies and isolated high-voltage flyback power supply topologies. In the push-pull topology, the input power comes from a low-voltage battery, generating six positive and negative voltage power supplies to power the controller's SiC (Silicon Carbide) power module. In the high-voltage flyback topology, the input power comes from a high-voltage battery pack, serving as a backup power source for the hardware circuitry involved in executing the ASC (Automatic Safety State) operation. Under normal conditions, the high-voltage drive supply voltage is higher than the emergency power supply voltage, and the single-phase diode at the emergency power supply output is cut off, preventing the emergency power supply from operating. When the low-voltage battery fails or the push-pull power supply fails, the emergency power supply intervenes, enabling the circuit to execute the ASC safety state.

[0003] However, the existing push-pull power supply topology uses a one-to-three architecture for the upper bridge push-pull power supply and shares one input power supply. If one of the three bridge arms of the upper bridge is abnormal (such as a load short circuit), the other two bridge arms of the upper bridge will not have output power. The other two phases of this bridge arm cannot be controlled to enter the ASC safety state. The SIC power module is at risk of shoot-through, which may damage other high-voltage components of the vehicle and affect driving safety. Similarly, the lower bridge has the same problem. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a motor controller drive power supply and control method, enabling each drive power supply to be independently controlled and powered without interference.

[0005] The purpose of this invention is to provide a motor controller drive power supply, including a main controller, a power management unit, multiple overcurrent protection circuits, an upper bridge drive power supply circuit, and a lower bridge drive power supply circuit; wherein, The main controller is connected to the power management unit, multiple overcurrent protection circuits, the upper bridge drive power supply circuit, and the lower bridge drive power supply circuit, respectively. The input terminal of the power management unit is connected to the input power supply, and its output terminal is connected to multiple overcurrent protection circuits respectively. The output terminals of multiple overcurrent protection circuits are connected to each bridge arm circuit in the upper bridge drive power supply circuit and the lower bridge drive power supply circuit, respectively, so that the main controller controls the output of multiple independent drive power supplies.

[0006] Furthermore, the upper and lower bridge drive power supply circuits adopt a push-pull power supply topology; The multiple overcurrent protection circuits consist of six overcurrent protection chips. Each overcurrent protection chip is also connected to each bridge arm circuit in the corresponding upper bridge drive power supply circuit and lower bridge drive power supply circuit, and outputs six independent drive power supplies under the control of the main controller.

[0007] Furthermore, the main controller outputs enable signals EN1 to EN6 to the corresponding overcurrent protection chips. By controlling the level of enable signals EN1 to EN6, the operating state of the six overcurrent protection chips is controlled. When the level of enable signals EN1 to EN6 is high, the corresponding overcurrent protection chip is controlled to work; when the level of enable signals EN1 to EN6 is low, the corresponding overcurrent protection chip is controlled to not work.

[0008] Furthermore, the power management unit includes an anti-reverse and ignition control circuit, a SEPIC power circuit, and an SBC power management circuit; wherein, The first terminal of the anti-reverse and ignition control circuit is connected to the input power supply, the second terminal is connected to the SBC power management circuit through a diode, and the third terminal is connected to the SEPIC power circuit. The SBC power management circuit outputs power to supply power to the main controller. The SEPIC power supply circuit converts the input power supply voltage into a first power supply voltage and outputs it to multiple overcurrent protection circuits.

[0009] Furthermore, the anti-reverse and ignition control circuit includes two series-connected first MOSFET switches and second MOSFET switches. The drain of the first MOSFET switch is connected to the input power supply, and the source is connected to the source of the second MOSFET switch and the SBC power management circuit, respectively. A diode is also connected in series between the second MOSFET switch and the SBC circuit unit, and the drain of the second MOSFET switch is connected to the SEPIC power circuit.

[0010] Furthermore, the SEPIC power supply circuit includes a first inductor, a first capacitor, a second inductor, and a third MOSFET switch. One end of the first inductor is connected to the drain of the second MOSFET switch of the reverse protection and ignition control circuit, and the other end is connected to one end of the first capacitor. A diode is connected to the other end of the first capacitor. The third MOSFET switch and the second inductor are connected in series and then in parallel with the capacitor. The drain of the third MOSFET switch is connected to one end of the first capacitor, and the source is connected in series with the second inductor and then to the other end of the first capacitor. The SEPIC power supply circuit converts the input power supply voltage into the first power supply voltage. The diode in the SEPIC power supply circuit is also connected to a third diode, which is then connected to six overcurrent protection chips.

[0011] Furthermore, it also includes an emergency backup power circuit, which comprises a high-voltage side circuit and a low-voltage side circuit, wherein, The high-voltage side circuit converts the high-voltage battery power supply into an emergency power supply for backup power and the lower bridge drive power supply; The low-voltage side circuit is connected to the SBC power management circuit through the first diode D1 and to six overcurrent protection chips through the second diode D2.

[0012] Furthermore, the high-voltage side circuit includes a high-voltage power supply circuit and a high-voltage transmission circuit. The high-voltage power supply circuit includes a PWM control chip, a fourth MOSFET switch, a high-voltage side diode, a first resistor, a second resistor, and a second capacitor. The output terminal of the PWM control chip is connected to the gate of the fourth MOSFET switch. The source of the fourth MOSFET switch is connected to the high-voltage negative terminal through the first resistor, and the drain is connected to the cathode of the high-voltage side diode. The cathode of the high-voltage side diode is also connected to one end of the high-voltage side primary coil. The anode of the high-voltage side diode is connected to one end of the second resistor and one end of the second capacitor, respectively. The second resistor and the second capacitor are connected in parallel and are connected to the high-voltage positive terminal and the other end of the high-voltage side primary coil, respectively. The high-voltage transmission circuit includes four high-voltage secondary coils. Three of these high-voltage secondary coils are connected to the U, V, and W phase lower bridge drive power supplies via diodes D3, D4, and D5, respectively. When the U, V, and W phase lower bridge drive power supplies fail, they are used to output power to the lower bridge drive chip to execute ASC. One high-voltage secondary coil is connected to the power supply of the PWM control chip. The low-voltage side circuit includes a low-voltage secondary coil and a backup power supply. The low-voltage secondary coil is connected to the backup power supply, which is connected to the SBC power management circuit through a first diode D1 and to six overcurrent protection chips through a second diode D2.

[0013] Another objective of this invention is to provide a control method for a motor controller drive power supply, applicable to the aforementioned motor controller drive power supply, comprising: If the current of an overcurrent protection chip exceeds the set detection threshold, the corresponding overcurrent protection chip will output a fault signal to the main controller. The main controller converts the high level of the enable signal of the corresponding overcurrent protection chip to a low level, shuts down the output power of the overcurrent protection chip on the corresponding bridge arm, and thus shuts down the drive power output on the corresponding bridge arm.

[0014] Furthermore, it also includes, When the input power fails, the emergency backup circuit outputs an emergency backup power supply voltage, which powers the SBC power management circuit through the first diode to maintain the normal operation of the main controller. At the same time, it powers the upper bridge drive power supply unit and the lower bridge drive power supply unit through the second diode.

[0015] Furthermore, it also includes, When the main controller fails, the three output terminals on the high-voltage side of the emergency backup power supply circuit continue to supply power to the circuit that performs ASC action through the three diodes D3, the fourth diode D4, and the fifth diode D5. The circuit that performs ASC action includes an active short-circuit control logic circuit and a lower bridge drive power supply unit.

[0016] In this invention, the output terminals of multiple overcurrent protection circuits in the motor controller drive power supply are respectively connected to each bridge arm circuit in the upper bridge drive power supply circuit and the lower bridge drive power supply circuit, so that the main controller controls the output of multiple independent drive power supplies. The upper three bridge arms and the lower three bridge arms of the upper bridge drive power supply circuit and the lower bridge drive power supply circuit are independently controlled and powered without interference. That is, if the power supply of one bridge arm is abnormal, the output can be shut down without affecting the power supply of other bridge arms. This enables the module to maintain the other bridge arms on the short-circuited side in the ASC state even when a phase bridge arm of the module is abnormally short-circuited.

[0017] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a motor controller drive power supply structure according to an embodiment of the present invention is shown; Figure 2 A schematic diagram of another motor controller drive power supply structure is shown in an embodiment of the present invention; Figure 3 A schematic flowchart of a motor controller drive power supply control method according to an embodiment of the present invention is shown. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figure 1 As shown in the illustration, this invention provides a motor controller drive power supply, which includes a main controller, a power management unit, multiple overcurrent protection circuits, an upper bridge drive power supply circuit, and a lower bridge drive power supply circuit. The main controller is connected to the power management unit, the multiple overcurrent protection circuits, the upper bridge drive power supply circuit, and the lower bridge drive power supply circuit. The input terminal of the power management unit is connected to the input power supply, and its output terminal is connected to the multiple overcurrent protection circuits. The output terminals of the multiple overcurrent protection circuits are connected to each bridge arm circuit in the upper and lower bridge drive power supply circuits, enabling the main controller to control and output multiple independent drive power supplies. The upper three bridge arms and the lower three bridge arms of the upper and lower bridge drive power supply circuits, comprising six drive power supplies, are independently controlled and powered without interference. That is, if the power supply of one bridge arm is abnormal, the output can be shut down without affecting the power supply of other bridge arms. This ensures that when a phase bridge arm of the module experiences an abnormal short circuit, the other bridge arms on the short-circuited side can still maintain an ASC (Automatic Safety System) state.

[0022] Specifically, such as Figure 2As shown, the main controller is an MCU (Microcontroller Unit). Furthermore, the upper and lower bridge drive power supply circuits adopt a push-pull power supply topology; the multiple overcurrent protection circuits consist of six overcurrent protection chips, each of which is also connected to each bridge arm circuit in the corresponding upper and lower bridge drive power supply circuits, outputting six independent drive power supplies under the control of the main controller. The power management unit includes a reverse polarity protection and ignition control unit, a SEPIC (Single-Ended Primary Inductor Converter) circuit unit, and an SBC (Single-Board Computer) circuit unit; wherein, the first terminal of the reverse polarity protection and ignition control unit is connected to the input power supply, its second terminal is connected to the SBC circuit unit through a diode, and its third terminal is connected to the SEPIC circuit unit. The SBC circuit unit outputs power to the MCU controller, and the SEPIC circuit unit converts the input power supply voltage into a first power supply voltage and outputs it to the multiple overcurrent protection circuits. Specifically, the first power supply voltage is VDD18V, but it is not limited to this; conversion to other power supply voltages is also applicable to this invention depending on the application.

[0023] The MCU controller is connected to six overcurrent protection chips and the upper and lower bridge drive power supply circuits. The MCU controller outputs enable signals EN1 to EN6 to the corresponding overcurrent protection chips. By controlling the level of enable signals EN1 to EN6, the operating state of the six overcurrent protection chips is controlled. Specifically, when the level of enable signals EN1 to EN6 is high, the corresponding overcurrent protection chip is controlled to operate; when the level of enable signals EN1 to EN6 is low, the corresponding overcurrent protection chip is controlled to not operate. Furthermore, each of the six overcurrent protection chips is equipped with a corresponding MOSFET switch, and the upper and lower bridge drive power supply circuits (… Figure 2 Each phase circuit in the upper and lower bridge drive power supply unit includes two MOSFET switches and a voltage coil. The gates of both MOSFET switches are connected to the MCU controller, their sources are connected together, and their drains are connected to one end of the primary coil of the voltage coil and the other end of the primary coil. Furthermore, the secondary path of the voltage coil is connected to the corresponding drive power supply via a series diode and a parallel capacitor. Overcurrent protection chips are connected to the middle terminal of the primary coil of the voltage coil. Furthermore, the MCU controller can not only control the switching on and off of the drive power supply but also control the magnitude of the drive power supply output voltage.

[0024] Furthermore, the anti-reverse and ignition control unit includes an anti-reverse and ignition control circuit, wherein the anti-reverse and ignition control circuit includes two MOSFET switches connected in series, namely a first MOSFET switch and a second MOSFET switch. Further, the input power supply is a low-voltage battery KL30. The drain of the first MOSFET switch in the anti-reverse and ignition control circuit is connected to the low-voltage battery KL30, and its source is connected to the source of the second MOSFET switch and the SBC circuit unit. A diode is connected in series between the MOSFET switch and the SBC circuit unit. The drain of the second MOSFET switch in the anti-reverse and ignition control circuit is connected to the SEPIC circuit unit. Figure 2 In this context, 12V (volts) UBR (Under - Battery Reverse) refers to the 12V output voltage of the reverse protection and ignition control unit, but it is not limited to this. Depending on the application environment, other output voltages are also applicable to this invention.

[0025] The SBC circuit unit includes the SBC power management circuit, whose output power supplies the MCU controller.

[0026] The SEPIC circuit unit includes a SEPIC power supply circuit, which comprises a first inductor, a first capacitor, a second inductor, and a third MOSFET switch. One end of the first inductor is connected to the third terminal of the reverse protection and ignition control circuit (i.e., the drain of the second MOSFET switch), and the other end is connected to one end of the first capacitor. A diode is connected to the other end of the first capacitor. The third MOSFET switch and the second inductor are connected in series and then in parallel with the capacitor. The drain of the third MOSFET switch is connected to one end of the first capacitor, and its source is connected in series with the second inductor and then to the other end of the first capacitor. The SEPIC power supply circuit converts the input power voltage into a first power supply voltage. The SEPIC power supply circuit is then connected to six overcurrent protection chips via diodes, outputting the first power supply voltage to multiple overcurrent protection circuits. As shown in Figure 2, the first power supply voltage is VDD18V (drain power supply voltage). However, this is not the only limitation; adjusting the output voltage to other values ​​depending on the application environment is also applicable to this invention.

[0027] The motor controller drive power supply also includes an emergency backup power circuit, which comprises a high-voltage side circuit and a low-voltage side circuit. The high-voltage side circuit includes a high-voltage power supply circuit and a high-voltage transmission circuit. The high-voltage power supply circuit includes a PWM (Pulse Width Modulation) control chip, a fourth MOSFET switch, a high-voltage side diode, a first resistor, a second resistor, and a second capacitor. The output terminal of the PWM control chip is connected to the gate of the fourth MOSFET switch. The source of the fourth MOSFET switch is connected to the high-voltage negative terminal through the first resistor, and the drain is connected to the cathode of the high-voltage side diode. The cathode of the high-voltage side diode is also connected to one end of the high-voltage side primary coil. The anode of the high-voltage side diode is connected to one end of the second resistor and one end of the second capacitor. The second resistor and the second capacitor are connected in parallel, and after parallel connection, they are connected to the high-voltage positive terminal and the other end of the high-voltage side primary coil, respectively. Furthermore, a high-voltage battery is connected to the high-voltage side circuit. The high-voltage transmission circuit includes four high-voltage secondary coils. Three of these coils are connected to the U, V, and W phase lower bridge drive power supplies via diodes D3, D4, and D5, respectively. When the U, V, and W phase lower bridge drive power supplies fail, they supply power to the lower bridge drive chip to execute Active Short Circuit (ASC). The circuit for executing ASC includes active short circuit control logic and the lower bridge drive circuit, ensuring safe torque shutdown and thus ensuring the torque safety of the entire vehicle and the safety of the vehicle's high-voltage battery system. One high-voltage secondary coil is connected to the PWM control chip power supply. The four high-voltage secondary coils are also connected to diodes and parallel capacitors and resistors. The high-voltage side circuit is used to convert the high-voltage battery power supply into emergency power for backup power, the lower bridge drive power supply, and the PWM control chip power supply. The low-voltage side circuit includes a low-voltage secondary coil and a backup power supply (VDD18V_EM: emergency backup power supply for the Emergency Module 18V). A capacitor is connected in parallel between the low-voltage secondary coil and the backup power supply, and a diode is connected in series. The backup power supply is connected to the SBC power management circuit through the first diode D1 and to six overcurrent protection chips through the second diode D2. A full backup power supply architecture is adopted between the high and low voltage sides. When the low-voltage battery KL30 loses power, the backup power supply can still provide the low-voltage power required by the MCU controller and the drive power required by the drive circuit. The controller can control the vehicle to operate normally and enter a safe state.

[0028] In this embodiment of the invention, the high-voltage power supply circuit is also called the flyback power supply control circuit; the PWM control chip achieves energy transfer and output voltage stability by controlling the on and off of the switching transistor. If only the lower bridge arm is connected in the high-voltage transmission circuit, only the drive power supply of the lower bridge arm is backed up, thus enabling the lower bridge arm ASC (Active Short Circuit) function to be executed.

[0029] like Figure 3 As shown in the illustration, this embodiment of the invention also introduces a control method for a motor controller drive power supply, applicable to the aforementioned motor controller drive power supply. The control method includes: first, if the current of an overcurrent protection chip exceeds a set detection threshold, the corresponding overcurrent protection chip outputs a fault signal to the main controller; then, the main controller converts the high level of the enable signal of the corresponding overcurrent protection chip to a low level, shutting down the output power of the overcurrent protection chip on the corresponding bridge arm, thereby shutting down the drive power output on the corresponding bridge arm. For example, when the load of the U-phase upper bridge drive power supply is abnormally short-circuited, the current will exceed the detection threshold set by the overcurrent protection chip. The overcurrent protection chip outputs a fault signal Fault1 to the MCU controller. After detecting the fault, the MCU controller flips the high level of the enable signal to a low level, shutting down the output power VDD18V_HU of the U-phase upper bridge overcurrent protection chip U1, thereby shutting down the U-phase upper bridge drive power output and protecting the preceding circuit. This will not affect the power supply to the V-phase and W-phase bridge arms, allowing continued control. This ensures that when a phase bridge arm of the module is abnormally short-circuited, it still has the ability to maintain other bridge arms on the short-circuited side in the ASC state.

[0030] In this embodiment of the invention, the control method further includes, when the input power supply fails, the emergency backup circuit outputs an emergency backup power supply voltage, which powers the SBC power management circuit through a first diode to maintain the normal operation of the main controller. Simultaneously, it powers the upper bridge drive power unit and the lower bridge drive power unit through a second diode. For example, when the low-voltage battery KL30 fails and the MCU controller loses its low-voltage power supply, the VDD18V_EM low-voltage emergency power supply output by the emergency backup power supply powers the SBC power management circuit through the first diode D1 (also a single-phase diode), enabling it to continue outputting power and maintaining the normal operation of the MCU controller and other control circuits. Simultaneously, it continues to power the upper and lower bridge drive power supplies through the second diode D2, enabling the controller to control the vehicle to operate normally and enter a safe state.

[0031] In this embodiment of the invention, the control method further includes, when the main controller fails, the three output terminals on the high-voltage side of the emergency backup power supply circuit continue to supply power to the ASC (Active Short Circuit) controller via the third diode D3, the fourth diode D4, and the fifth diode D5. Figure 2 The circuitry (not shown in the diagram) includes the active short-circuit control logic circuit and the lower bridge drive power supply unit. A fully backup power architecture is adopted between the high and low voltage levels. When the low-voltage battery KL30 loses power, the backup power supply can still supply power to the low-voltage power supply and drive power supply. The controller system can then control the vehicle to operate normally and enter a safe state.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A motor controller drive power supply, characterized in that, It includes a main controller, a power management unit, multiple overcurrent protection circuits, an upper bridge drive power supply circuit, and a lower bridge drive power supply circuit; among which, The main controller is connected to the power management unit, multiple overcurrent protection circuits, the upper bridge drive power supply circuit, and the lower bridge drive power supply circuit, respectively. The input terminal of the power management unit is connected to the input power supply, and its output terminal is connected to multiple overcurrent protection circuits respectively. The output terminals of multiple overcurrent protection circuits are connected to each bridge arm circuit in the upper bridge drive power supply circuit and the lower bridge drive power supply circuit, respectively, so that the main controller controls the output of multiple independent drive power supplies.

2. The motor controller drive power supply according to claim 1, characterized in that, The upper and lower bridge drive power supply circuits adopt a push-pull power supply topology; The multiple overcurrent protection circuits consist of six overcurrent protection chips. Each overcurrent protection chip is also connected to each bridge arm circuit in the corresponding upper bridge drive power supply circuit and lower bridge drive power supply circuit, and outputs six independent drive power supplies under the control of the main controller.

3. The motor controller drive power supply according to claim 1, characterized in that, The main controller outputs enable signals EN1 to EN6 to the corresponding overcurrent protection chips. By controlling the level of enable signals EN1 to EN6, the operating state of the six overcurrent protection chips is controlled. When the level of enable signals EN1 to EN6 is high, the corresponding overcurrent protection chip is controlled to work; when the level of enable signals EN1 to EN6 is low, the corresponding overcurrent protection chip is controlled to not work.

4. The motor controller drive power supply according to any one of claims 1-3, characterized in that, The power management unit includes an anti-reverse and ignition control circuit, a SEPIC power circuit, and an SBC power management circuit; wherein... The first terminal of the anti-reverse and ignition control circuit is connected to the input power supply, the second terminal is connected to the SBC power management circuit through a diode, and the third terminal is connected to the SEPIC power circuit. The SBC power management circuit outputs power to supply power to the main controller. The SEPIC power supply circuit converts the input power supply voltage into a first power supply voltage and outputs it to multiple overcurrent protection circuits.

5. The motor controller drive power supply according to claim 4, characterized in that, The anti-reverse and ignition control circuit includes two series-connected first MOSFET switches and second MOSFET switches. The drain of the first MOSFET switch is connected to the input power supply, and the source is connected to the source of the second MOSFET switch and the SBC power management circuit. A diode is also connected in series between the second MOSFET switch and the SBC circuit unit. The drain of the second MOSFET switch is connected to the SEPIC power circuit.

6. The motor controller drive power supply according to claim 5, characterized in that, The SEPIC power supply circuit includes a first inductor, a first capacitor, a second inductor, and a third MOSFET switch. One end of the first inductor is connected to the drain of the second MOSFET switch of the reverse protection and ignition control circuit, and the other end is connected to one end of the first capacitor. A diode is connected to the other end of the first capacitor. The third MOSFET switch and the second inductor are connected in series and then in parallel with the capacitor. The drain of the third MOSFET switch is connected to one end of the first capacitor, and the source is connected in series with the second inductor and then to the other end of the first capacitor. The SEPIC power supply circuit converts the input power supply voltage into the first power supply voltage. The diode in the SEPIC power supply circuit is also connected to a third diode, which is then connected to six overcurrent protection chips.

7. The motor controller drive power supply according to claim 6, characterized in that, It also includes an emergency backup power circuit, which comprises a high-voltage side circuit and a low-voltage side circuit, wherein, The high-voltage side circuit converts the high-voltage battery power supply into an emergency power supply for backup power and the lower bridge drive power supply; The low-voltage side circuit is connected to the SBC power management circuit through the first diode D1 and to six overcurrent protection chips through the second diode D2.

8. The motor controller drive power supply according to claim 7, characterized in that, The high-voltage side circuit includes a high-voltage power supply circuit and a high-voltage transmission circuit. The high-voltage power supply circuit includes a PWM control chip, a fourth MOSFET switch, a high-voltage side diode, a first resistor, a second resistor, and a second capacitor. The output terminal of the PWM control chip is connected to the gate of the fourth MOSFET switch. The source of the fourth MOSFET switch is connected to the high-voltage negative terminal through the first resistor, and the drain is connected to the cathode of the high-voltage side diode. The cathode of the high-voltage side diode is also connected to one end of the high-voltage side primary coil. The anode of the high-voltage side diode is connected to one end of the second resistor and one end of the second capacitor. The second resistor and the second capacitor are connected in parallel and are then connected to the high-voltage positive terminal and the other end of the high-voltage side primary coil, respectively. The high-voltage transmission circuit includes four high-voltage secondary coils. Three of these high-voltage secondary coils are connected to the U, V, and W phase lower bridge drive power supplies via diodes D3, D4, and D5, respectively. When the U, V, and W phase lower bridge drive power supplies fail, they are used to output power to the lower bridge drive chip to execute ASC. One high-voltage secondary coil is connected to the power supply of the PWM control chip. The low-voltage side circuit includes a low-voltage secondary coil and a backup power supply. The low-voltage secondary coil is connected to the backup power supply, which is connected to the SBC power management circuit through a first diode D1 and to six overcurrent protection chips through a second diode D2.

9. A control method for a motor controller drive power supply, characterized in that, The motor controller drive power supply according to any one of claims 1-8 includes, If the current of an overcurrent protection chip exceeds the set detection threshold, the corresponding overcurrent protection chip will output a fault signal to the main controller. The main controller converts the high level of the enable signal of the corresponding overcurrent protection chip to a low level, shuts down the output power of the overcurrent protection chip on the corresponding bridge arm, and thus shuts down the drive power output on the corresponding bridge arm.

10. The control method according to claim 9, characterized in that, It also includes, When the input power fails, the emergency backup circuit outputs an emergency backup power supply voltage, which powers the SBC power management circuit through the first diode to maintain the normal operation of the main controller. At the same time, it powers the upper bridge drive power supply unit and the lower bridge drive power supply unit through the second diode.

11. The control method according to claim 9, characterized in that, It also includes, When the main controller fails, the three output terminals on the high-voltage side of the emergency backup power supply circuit continue to supply power to the circuit that performs ASC action through the three diodes D3, the fourth diode D4, and the fifth diode D5. The circuit that performs ASC action includes an active short-circuit control logic circuit and a lower bridge drive power supply unit.

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