Controller protection system and working method thereof, electronic device and storage medium

Abstract

The application relates to the technical field of controller protection, in particular to a controller protection system and a working method thereof, an electronic device and a storage medium. The system comprises a power battery, a high-voltage relay, a preset controller, an energy storage device and a permanent magnet synchronous motor. The power battery is connected with the high-voltage relay through a first switch control connection. The preset controller is connected with the energy storage device through a second switch control connection. The energy storage device is connected with the power battery through a third switch control connection. The high-voltage relay is controlled by the preset controller. The permanent magnet synchronous motor is controlled by the preset controller. The working method comprises a first working mode and a second working mode. When the first working mode is performed, the first switch is closed to connect the power battery with the high-voltage relay, and the second switch and the third switch are disconnected. The application can not only protect the system from overvoltage damage, but also use the captured energy to charge the power battery subsequently, so that the energy utilization rate is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of controller protection, and in particular to a controller protection system, a working method thereof, an electronic device and a storage medium. BACKGROUND

[0002] Some vehicles need to integrate a motor controller (MCU) and a device (DCDC) that converts high-voltage direct current into low-voltage direct current together to form a two-in-one controller, but because of the space limitation of the whole vehicle, the size limit of the DCDC is restricted, which also leads to the fact that the voltage resistance level of the DCDC cannot be too high.

[0003] However, the prior art cannot effectively deal with the case where the voltage platform of the whole vehicle is medium or low, which leads to the fact that the motor and the DCDC bear large current. If the space of the whole vehicle is limited, the size of the two-in-one controller is small. When the high-voltage system is abnormal or due to inertia or high speed of the driving system, the motor will generate a larger back electromotive force (electromotive force generated by the tendency of the change of counter current, referred to as TAC), which exceeds the voltage resistance limit of the DCDC, thereby causing an overvoltage problem of the two-in-one controller, leading to damage. SUMMARY

[0004] To solve the technical problem of the two-in-one controller being attacked by the generated electromotive force, the present application provides a controller protection system, a working method thereof, an electronic device and a storage medium.

[0005] The first aspect of the present application provides a controller protection system, which comprises a power battery, a high-voltage relay, a preset controller, an energy storage device and a permanent magnet synchronous motor. The power battery is connected to the high-voltage relay through a first switch control. The preset controller is connected to the energy storage device through a second switch control. The energy storage device is connected to the power battery through a third switch control. The high-voltage relay is controlled by the preset controller. The permanent magnet synchronous motor is controlled by the preset controller.

[0006] In some embodiments of the present application, the preset controller comprises a motor controller and a DCDC device. The output end of the high-voltage relay is connected to the input end of the motor controller and the DCDC device. The motor controller is connected to the permanent magnet synchronous motor.

[0007] In some embodiments of the present application, the system further comprises a storage battery, which is connected to the DCDC device.

[0008] The second aspect of the present application provides a working method of the controller protection system in each embodiment, which comprises a first working mode and a second working mode.

[0009] When the first operation mode is performed, the first switch is closed to connect the power battery and the high-voltage relay, and the second switch and the third switch are disconnected.

[0010] In some embodiments of the present application, when the second operation mode is performed, the first switch is disconnected, and the second switch and the third switch are closed to make the high-voltage relay controlled by the motor controller.

[0011] In some embodiments of the present application, before the second operation mode is performed, the method further comprises:

[0012] determining whether the input voltage of the motor controller and the DCDC device is greater than a first preset value, and determining whether the rotating speed of the permanent magnet synchronous motor is greater than a second preset value;

[0013] If the input voltage of the motor controller and the DCDC device is greater than the first preset value and the rotating speed of the permanent magnet synchronous motor is greater than the second preset value, the second operation mode is started.

[0014] In some embodiments of the present application, after the second operation mode is performed, the method further comprises:

[0015] monitoring the input voltage of the motor controller and the DCDC device, the rotating speed of the permanent magnet synchronous motor, and the phase current of the permanent magnet synchronous motor;

[0016] If the input voltage of the motor controller and the DCDC device is less than a third preset value, or the rotating speed of the permanent magnet synchronous motor is less than a fourth preset value, or the phase current of the permanent magnet synchronous motor is less than a fifth preset value, the second operation mode is exited.

[0017] In some embodiments of the present application, after the second operation mode is performed, the method further comprises: when the voltage of the energy storage device is less than a sixth preset value, the second switch and the third switch are disconnected.

[0018] The third aspect of the present application provides an electronic device, comprising a memory and a processor, the memory stores computer readable instructions, and the computer readable instructions are executed by the processor to make the processor execute the working method of the controller protection system in the embodiments of the present application.

[0019] The fourth aspect of the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the working method of the controller protection system in the embodiments of the present application.

[0020] The technical scheme provided in the embodiments of the present application has at least the following technical effects or advantages:

[0021] The controller protection system in the embodiments of the present application comprises a power battery, a high-voltage relay, a preset controller, an energy storage device and a permanent magnet synchronous motor. The power battery is connected with the high-voltage relay through a first switch. The preset controller is connected with the energy storage device through a second switch. The energy storage device is connected with the power battery through a third switch. The high-voltage relay is controlled by the preset controller. The permanent magnet synchronous motor is controlled by the preset controller. The working method comprises a first working mode and a second working mode. When the first working mode is performed, the first switch is closed to connect the power battery with the high-voltage relay, and the second switch and the third switch are opened. When the second working mode is performed, the first switch is opened, and the second switch and the third switch are closed to control the high-voltage relay by the motor controller. In this way, the control of the high-voltage relay by the preset controller, i.e. the two-in-one controller, can timely disconnect the high voltage when the motor generates a large back electromotive force, preventing the damage of the controller due to overvoltage. This control mode can effectively avoid the damage of the equipment due to high speed or abnormal high-voltage system, thereby improving the safety and reliability of the whole system. Moreover, the energy storage device is introduced to collect the back electromotive force energy generated by the motor and charge the power battery, realizing the secondary utilization of energy, which not only reduces the waste of energy, but also increases the energy efficiency of the whole vehicle, meeting the current environmental protection requirements of energy saving and emission reduction. In addition, the control system of the present application can adapt to the situation of low-voltage platform, i.e. even in the case of small size of the two-in-one controller due to limited space of the whole vehicle, the normal operation and stability of the system can be ensured.

[0022] 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. BRIEF DESCRIPTION OF DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Furthermore, the same reference numerals in different drawings designate the same elements. In the drawings:

[0024] Figure 1 is a structural schematic diagram of a controller system in the prior art;

[0025] Figure 2 is a structural schematic diagram of a controller protection system in an exemplary embodiment of the present application;

[0026] Figure 3 is a step schematic diagram of a working method of a controller protection system in an exemplary embodiment of the present application;

[0027] Figure 4 is a flowchart of a method for operating a controller protection system according to an example embodiment of the present application;

[0028] Figure 5 is a structural diagram of an electronic device according to an example embodiment of the present application.

[0029] It should be understood that the general description above and the detailed description below are only illustrative and explanatory, and are not restrictive of the present application. DETAILED DESCRIPTION

[0030] The present application will be further described below in conjunction with the accompanying drawings and examples. It should be understood that the examples depicted herein are only intended to explain the related application, and are not limiting of the application. It should also be noted that only the parts related to the application are shown in the accompanying drawings for the convenience of description.

[0031] In the modern automotive industry, there is an increasing demand for integrating the motor controller (MCU) and the DC-DC converter (DCDC) into a two-in-one controller. This integration aims to reduce the volume of components and improve the overall efficiency of the system.

[0032] However, one of the main challenges of this integration is the limitation of the vehicle space, which limits the size and voltage withstand level of the DCDC. In practical applications, when the vehicle is running at high speed or under high load conditions, the permanent magnet synchronous motor may generate a back electromotive force TAC higher than the voltage withstand limit of the DCDC, which not only may cause damage to the DCDC, but also may affect the stability and safety of the entire system.

[0033] Figure 1 is a structural diagram of a controller system in the prior art, as shown in Figure 1 The two-in-one controller including the motor controller and the DCDC device is directly connected to the power battery and the permanent magnet synchronous motor. This structure simplifies the design of the control system, reduces the number of components, and thus saves space and cost to some extent. Specifically, the motor controller is responsible for driving the permanent magnet synchronous motor, while the DCDC device is responsible for converting the high-voltage direct current from the power battery into low-voltage direct current suitable for use by the motor and other vehicle systems.

[0034] However, under high-speed running or high-load conditions, the permanent magnet synchronous motor may generate a back electromotive force that exceeds the voltage withstand limit of the DCDC, which may cause damage to the DCDC component and affect the stability and safety of the entire system. The prior art does not have an energy recovery system, and when the motor generates a high back electromotive force TAC, this part of energy is not effectively utilized, but simply dissipated, causing energy waste.

[0035] To this end, in some embodiments of the present application, a controller protection system is provided, as shown in Figure 2 The system includes a power battery, a high-voltage relay, a preset controller, an energy storage device, and a permanent magnet synchronous motor. The power battery is connected to the high-voltage relay through a first switch S1 in Figure 2 The preset controller is connected to the energy storage device through a second switch S2 in Figure 2 The energy storage device is connected to the power battery through a third switch S3 in Figure 2 The high-voltage relay is controlled by the preset controller. The permanent magnet synchronous motor is controlled by the preset controller. The preset controller includes a motor controller MCU and a DCDC device, also known as a two-in-one controller. The output of the high-voltage relay is connected to the input of the motor controller and the DCDC device. The motor controller is connected to the permanent magnet synchronous motor. The system also includes a storage battery connected to the DCDC device.

[0036] It can be understood that the above-mentioned power battery provides the main power supply as the main power source of the system, providing the necessary electrical energy for the entire vehicle. The high-voltage relay is a device that can cut off or connect the high-voltage line. When the back electromotive force of the motor exceeds the preset threshold, it can be disconnected to cut off the high-voltage power supply and protect the system from overvoltage. The motor controller and DCDC device are responsible for motor driving and voltage conversion, converting voltage and controlling the permanent magnet synchronous motor to operate according to predetermined parameters. The permanent magnet synchronous motor performs power output, and its operating efficiency directly affects the performance of the entire vehicle. In the protection system of the present application, an energy storage device is added and connected to the motor controller. When the high-voltage relay is disconnected, the back electromotive force generated by the motor can be captured and stored by the energy storage device. The energy recovered from the motor back electromotive force TAC is stored, which not only protects the system from overvoltage damage, but also uses the captured energy to charge the power battery later, thereby improving energy utilization.

[0037] Overall, the controller protection system effectively solves the safety hazards and energy waste problems in the prior art by introducing a high-voltage relay and an energy storage device. First, it improves system safety by intelligently controlling the high-voltage relay to automatically disconnect when the motor back electromotive force TAC exceeds the DCDC voltage resistance, effectively preventing overvoltage damage to equipment and potential safety risks. Second, energy recovery and reuse, using the energy storage device to capture and store the back electromotive force energy generated by the motor, not only protects the system from overvoltage damage, but also realizes effective use of energy, improving the energy efficiency and environmental performance of the entire vehicle. Finally, it improves system stability and reliability, i.e., by optimizing the control strategy of the motor and DCDC device to ensure stable operation of the system under various working conditions and extend the service life of the equipment.

[0038] In some embodiments of the present application, a method for operating the controller protection system is also provided, which includes two operating modes, i.e. a first operating mode and a second operating mode, i.e. a normal mode and an emergency protection mode. As shown in Figure 3 the first operating mode, the first switch is closed to connect the power battery and the high-voltage relay, and the second switch and the third switch are opened. In the second operating mode, the first switch is opened, and the second switch and the third switch are closed to make the high-voltage relay controlled by the motor controller.

[0039] Referring to Figure 2 , in the first operating mode, i.e. the normal operating state of the system, the first switch S1 is closed to connect the power battery and the high-voltage relay for normal power supply, and the second switch S2 and the third switch S3 are opened. When the system is running in the normal state, the motor controller MCU in the two-in-one controller is controlled by the external controller.

[0040] The second operating mode can be regarded as an emergency protection mode. When the input voltage of the motor controller and the DCDC device, i.e. the bus voltage Udc between the high-voltage relay connected to the two-in-one controller, exceeds the first preset value, and the motor speed exceeds the second preset value, the system switches to this mode. In other words, before the second operating mode is performed, it is determined whether the input voltage of the motor controller and the DCDC device is greater than the first preset value, and whether the speed of the permanent magnet synchronous motor is greater than the second preset value; if the input voltage of the motor controller and the DCDC device is greater than the first preset value and the speed of the permanent magnet synchronous motor is greater than the second preset value, the second operating mode is started. At this time, as shown in Figure 2 , the first switch S1 is opened, the second switch S2 and the third switch S3 are closed, and the energy storage device is started to store the back electromotive force energy of the motor into the energy storage device. The first preset value here can be determined according to the voltage platform of the whole vehicle, for example, the first preset value is 900 volts, and the second preset value is 4000 RPM (Revolutions Per Minute). When the bus voltage is 901 volts and the motor speed is 4001 RPM, the system switches to the emergency protection mode.

[0041] It can be understood that the above-mentioned emergency protection mode also belongs to the over-authorization mode, because at this time the motor controller MCU in the two-in-one controller is no longer controlled by the external controller, and the MCU itself functions, or in other words, it itself opens the tube (indicating that the power device of the MCU can be turned on or off to control the motor). After the MCU opens the tube, it can quickly respond to the high back electromotive force generated by the motor, protect the system from damage, and realize the recycling and reuse of energy.

[0042] In a specific implementation, after performing the second working mode, it also includes: monitoring the input terminal voltage of the motor controller and the DCDC device, the speed of the permanent magnet synchronous motor and the phase current of the permanent magnet synchronous motor; if the input terminal voltage of the motor controller and the DCDC device is less than a third preset value, such as 450V, or the speed of the permanent magnet synchronous motor is less than a fourth preset value, such as 1000RPM, or the phase current of the permanent magnet synchronous motor is less than a fifth preset value, such as 50A (RMS), then exiting the second working mode.

[0043] In another specific implementation, after the second operating mode is implemented, when the voltage of the energy storage device is less than a sixth preset value, the second switch and the third switch are disconnected. The sixth preset value can be set based on actual conditions, meaning that when the voltage of the energy storage device is less than a specific value, the power battery does not need to be charged; otherwise, the power battery continues to be charged.

[0044] Consider an application scenario employing the controller protection system method described herein. An electric vehicle is traveling at high speed on a highway. Initially, the vehicle operates normally, but then its permanent magnet synchronous motor, operating at high load, generates a back electromotive force exceeding the DC-DC withstand voltage limit. Both the system's bus voltage Udc and motor speed exceed preset safety thresholds, prompting the system to switch to emergency protection mode to prevent damage. Figure 4 Is a controller protection system (reference Figure 2 A flow chart of the working method of the system shown in FIG. Figure 4 As shown, at the beginning, or initial state, the vehicle is in a normal state. At this time, the second switch S2 and the third switch S3 are open, while the second switch S1 and the high-voltage relay are closed. As can be seen, during normal system operation, the first switch S1 is closed, connecting the power battery and the high-voltage relay to provide normal power. The second switch S2 and the third switch S3 are open, and the energy storage device is not involved in operation.

[0045] Next, it is determined whether the input voltage of the motor controller and the DCDC device, i.e. the bus voltage Udc between the high-voltage relay and the two-in-one controller, is greater than a set value and the motor speed is also greater than a set value. If yes, the high-voltage relay is disconnected to enter the override mode, i.e. the motor controller forcibly opens the tube. For example, when the system detects that the bus voltage Udc exceeds 900 volts and the motor speed exceeds 4000 RPM, the system automatically switches to the second working mode, i.e. the emergency protection mode. The motor controller disconnects the high-voltage relay to cut off the high-voltage power supply to prevent overvoltage damage. At the same time, the second switch S2 and the third switch S3 are closed to start the energy storage device to collect the back electromotive force energy generated by the motor. It should be noted that the high-voltage relay and the motor controller are electrically connected, and the high-voltage relay is always controlled by the motor controller, whether the high-voltage relay is disconnected or closed.

[0046] Further, during the process of this mode, it is determined whether the phase current of the permanent magnet synchronous motor is less than a set value, or whether the input voltage of the motor controller and the DCDC device is less than a set value, or whether the speed of the permanent magnet synchronous motor is less than a set value. If one of the three determinations is true, the second switch S2 and the third switch S3 are disconnected. For example, if the phase current of the motor is less than 50 amperes (RMS), the bus voltage is less than 450 volts, or the motor speed is less than 1000 RPM, the system will exit the emergency protection mode and the system will return to the normal working mode. At this time, the high-voltage relay is closed to restore the high-voltage power supply, the second switch S2 and the third switch S3 are disconnected, the energy storage device stops working, and the system returns to the first working mode, i.e. the normal operating state.

[0047] Preferably, if the voltage of the energy storage device is less than a set value, S2 is also disconnected to stop charging the power battery. The energy collected by the energy storage device is used to charge the power battery to improve energy utilization. During this process, if the voltage of the energy storage device is less than a set value (for example, 200 volts), S2 and S3 are disconnected to stop the charging process to protect the power battery and the energy storage device.

[0048] It can be understood that the present application automatically disconnects the high-voltage relay when the back electromotive force of the motor exceeds the voltage resistance of the DCDC device through intelligent control of the high-voltage relay, which can effectively prevent equipment damage and potential safety risks caused by overvoltage. The present application uses the energy storage device to capture and store the back electromotive force energy generated by the motor, which not only protects the system from overvoltage damage, but also realizes effective utilization of energy and improves the energy efficiency and environmental performance of the whole vehicle. In addition, the present application optimizes the control strategy of the motor and the DCDC device to ensure stable operation of the system under various working conditions and prolong the service life of the equipment.

[0049] Please refer to Figure 5 which shows a schematic diagram of an electronic device provided by some embodiments of the present application. As shown inFigure 5 As shown, the electronic device 2 comprises a processor 200, a memory 201, a bus 202 and a communication interface 203, the processor 200, the communication interface 203 and the memory 201 are connected through the bus 202; the memory 201 stores a computer program which can be run on the processor 200, and the processor 200 runs the computer program to execute the working method of the controller protection system provided by any one of the preceding embodiments of the application, the system comprises a power battery, a high-voltage relay, a preset controller, an energy storage device and a permanent magnet synchronous motor; the power battery is connected with the high-voltage relay through a first switch control; the preset controller is connected with the energy storage device through a second switch control; the energy storage device is connected with the power battery through a third switch control; the high-voltage relay is controlled by the preset controller; and the permanent magnet synchronous motor is controlled by the preset controller. The working method comprises a first working mode and a second working mode; when the first working mode is performed, the first switch is closed to connect the power battery with the high-voltage relay, and the second switch and the third switch are turned off; when the second working mode is performed, the first switch is turned off, and the second switch and the third switch are closed to control the high-voltage relay by the motor controller.

[0050] The memory 201 can include a high-speed random access memory (RAM) and can also include a non-volatile memory such as at least one disk memory. The communication between the system network element and at least one other network element is realized through at least one communication interface 203 (which can be wired or wireless), and the Internet, a wide area network, a local network, a metropolitan area network, etc. can be used.

[0051] The bus 202 can be an ISA bus, a PCI bus, an EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. The memory 201 is used to store programs, and the processor 200 executes the programs after receiving execution instructions. The control method disclosed in any one of the preceding embodiments of the application can be applied to the processor 200 or realized by the processor 200.

[0052] The processor 200 can be an integrated circuit chip with signal processing capability. In implementation, each step of the above method can be completed by integrated logic circuits or instructions in software form in the processor 200. The processor 200 described above can be a general processor, including a central processing unit (CPU), a network processor (NP), etc.; or can be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a ready programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component. Each method, step and logic block diagram disclosed in the embodiments of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as a hardware code processor for execution, or a combination of hardware and software modules in the code processor for execution. The software module can be located in a random access memory, a flash memory, a read only memory, a programmable read only memory or an electrically erasable programmable memory, a register, etc. The storage medium in the art. The storage medium is located in the memory 201, and the processor 200 reads the information in the memory 201, and combines the hardware to complete the steps of the working method of the controller protection system.

[0053] The embodiments of the present application also provide a computer readable storage medium corresponding to the working method of the controller protection system provided by the foregoing embodiments, and a computer program is stored on the computer readable storage medium. When the processor runs, the computer program will execute the working method of the controller protection system provided by any of the foregoing embodiments.

[0054] In addition, examples of the computer readable storage medium can also include, but are not limited to, a phase change memory (PRAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), other types of random access memory (RAM), a read only memory (ROM), an electrically erasable programmable read only memory (EEPROM), a flash memory or other optical, magnetic storage medium, which will not be described one by one here.

[0055] In addition, the application further provides a computer program product comprising a computer program which, when executed by a processor, implements the working method of the controller protection system provided by any of the preceding embodiments, the system comprising a power battery, a high-voltage relay, a preset controller, an energy storage device, and a permanent magnet synchronous motor; the power battery is connected to the high-voltage relay through a first switch control; the preset controller is connected to the energy storage device through a second switch control; the energy storage device is connected to the power battery through a third switch control; the high-voltage relay is controlled by the preset controller; and the permanent magnet synchronous motor is controlled by the preset controller. The working method comprises a first working mode and a second working mode; when the first working mode is performed, the first switch is closed to connect the power battery and the high-voltage relay, and the second switch and the third switch are turned off; and when the second working mode is performed, the first switch is turned off, and the second switch and the third switch are closed to control the high-voltage relay by the motor controller.

[0056] Those skilled in the art can understand that various component embodiments of the application can be implemented in hardware, or implemented in software modules running on one or more processors, or implemented in a combination thereof. Those skilled in the art should understand that a microprocessor or a digital signal processor (DSP) can be used in practice to implement some or all of the functions of some or all of the components in the virtual machine creation apparatus according to the embodiments of the application.

[0057] The above description is only the preferred specific implementation of the application, but the protection scope of the application is not limited to this. Any changes or replacements within the technical scope disclosed by the application can be easily thought of by those skilled in the art, and should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A controller protection system, characterized by, The system comprises a power battery, a high-voltage relay, a preset controller, an energy storage device and a permanent magnet synchronous motor; the power battery is connected with the high-voltage relay through a first switch control; the preset controller is connected with the energy storage device through a second switch control; the energy storage device is connected with the power battery through a third switch control; the high-voltage relay is controlled by the preset controller; and the permanent magnet synchronous motor is controlled by the preset controller. The preset controller comprises a motor controller and a DCDC device, and an output end of the high-voltage relay is connected with input ends of the motor controller and the DCDC device; and the motor controller is connected with the permanent magnet synchronous motor.

2. The controller protection system of claim 1, wherein, The system further comprises a storage battery connected with the DCDC device.

3. A method of operating a controller protection system as claimed in claim 1 or 2, characterized in that The working method comprises a first working mode and a second working mode. When the first working mode is performed, the first switch is closed to connect the power battery with the high-voltage relay, and the second switch and the third switch are opened.

4. The method of claim 3, wherein the controller protection system is operated in a manner such that, When the second working mode is performed, the first switch is opened, and the second switch and the third switch are closed to control the high-voltage relay by the motor controller.

5. The method of claim 4, wherein the controller protection system is operated in a manner such that, Before the second working mode is performed, the method further comprises: determining whether the input end voltage of the motor controller and the DCDC device is greater than a first preset value, and determining whether the rotating speed of the permanent magnet synchronous motor is greater than a second preset value; if the input end voltage of the motor controller and the DCDC device is greater than the first preset value and the rotating speed of the permanent magnet synchronous motor is greater than the second preset value, the second working mode is started.

6. The method of claim 4, wherein the controller protection system is operated in a manner such that, After the second working mode is performed, the method further comprises: monitoring the input end voltage of the motor controller and the DCDC device, the rotating speed of the permanent magnet synchronous motor and the phase current of the permanent magnet synchronous motor; if the input end voltage of the motor controller and the DCDC device is less than a third preset value, or the rotating speed of the permanent magnet synchronous motor is less than a fourth preset value, or the phase current of the permanent magnet synchronous motor is less than a fifth preset value, the second working mode is exited.

7. The method of claim 4, wherein the controller protection system is operated in a manner such that, After the second working mode is performed, the method further comprises: when the voltage of the energy storage device is less than a sixth preset value, the second switch and the third switch are opened.

8. An electronic device comprising a memory and a processor, characterized in that, The computer readable instructions stored in the memory are executed by the processor to make the processor execute the working method of the controller protection system according to any one of claims 4-7.

9. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to realize the working method of the controller protection system according to any one of claims 4-7.

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