Motor controller power supply control method and control circuit

Abstract

The present invention provides a motor controller power supply control method and control circuit, which relate to the field of motor control, including: providing a main power supply and a redundant power supply, wherein the main power supply is powered by a low-voltage battery and the redundant power supply is powered by a high-voltage battery; closing the main power supply switching switch and disconnecting the redundant power supply switching switch, so that the main power supply is connected to the control system for power supply; using a low-voltage detection circuit to monitor the voltage of the low-voltage battery in real time, and when it is monitored that the voltage of the low-voltage battery is lower than a first threshold, the redundant power supply switching switch is closed and the main power supply switching switch is disconnected at the same time; using a high-voltage detection circuit to monitor the voltage of the high-voltage battery in real time, and when it is monitored that the voltage of the high-voltage battery is lower than a second threshold, the control system reversely instructs to control and disconnect the redundant power supply, thereby solving the problem that the existing redundant power supply only relies on hardware to switch in, and cannot be switched out when the high-voltage battery exceeds the safe operating voltage range, posing a safety hazard.

Description

Technical Field

[0001] The present invention relates to the technical field of motor control, and in particular to a power supply control method and a control circuit for a motor controller. Background Art

[0002] In an electric vehicle's powertrain, the motor controller converts the energy stored in the power battery into the energy required to drive the motor, based on commands like gear position, throttle, and brake. This power control controls the vehicle's starting, forward and backward speeds, and hill-climbing capabilities. In the event of an unexpected low-voltage power supply or power outage, the motor controller will run out of power, potentially causing the vehicle to lose power and drive properly. This can impact vehicle performance and safety, leading to potential driving hazards. Therefore, redundant power supplies can improve vehicle safety.

[0003] Limited by the size of the motor controller, the isolation transformer of the redundant power supply should be as small as possible. However, the input voltage operating range of the redundant power supply is very wide, from 60VDC to 900VDC. Generally, the isolation transformer is designed to have a long-term operating voltage of no less than 230V. If it works at low voltage for a long time, the isolation transformer will heat up and seriously shorten its service life. If the operating voltage is very low, the isolation transformer may directly burn out.

[0004] Most existing control methods rely on hardware to control the switching on of redundant power supplies. The advantage is that the redundant power supply can switch on and operate normally regardless of the load of the low-voltage control system or the sudden power failure of the main power supply. However, when the high-voltage battery voltage is very low and exceeds the safe operating voltage range of the isolation transformer, it cannot be switched off, posing certain safety risks. Summary of the Invention

[0005] In order to overcome the above technical defects, the purpose of the present invention is to provide a motor controller power supply control method and control circuit to solve the problem that the existing redundant power supply only relies on hardware to cut in and cannot be cut out when the high-voltage battery exceeds the safe operating voltage range, posing a safety hazard.

[0006] The present invention discloses a power supply control method for a motor controller, comprising:

[0007] Providing a main power supply and a redundant power supply, wherein the main power supply is powered by a low-voltage battery and the redundant power supply is powered by a high-voltage battery;

[0008] Close the main power switch and open the redundant power switch to connect the main power supply to the control system.

[0009] A low-voltage detection circuit is used to monitor the voltage of the low-voltage battery in real time. When the voltage of the low-voltage battery is detected to be lower than a first threshold, the redundant power supply switching switch is closed and the main power supply switching switch is opened at the same time.

[0010] A high-voltage detection circuit is used to monitor the voltage of the high-voltage battery in real time. When the voltage of the high-voltage battery is detected to be lower than a second threshold, the control system reverses the instruction control to disconnect the redundant power supply.

[0011] Preferably, when the redundant power supply switching switch is closed and it is detected that the voltage of the high-voltage battery is lower than the second threshold:

[0012] When it is monitored that the voltage of the low-voltage battery is higher than the third threshold, the redundant power supply switching switch is opened and the main power supply switching switch is closed.

[0013] Preferably, before the control system reversely controls and disconnects the redundant power supply, the method further includes:

[0014] The number of times the monitored high-voltage battery voltage is lower than the second threshold is calculated. When the number exceeds a fourth threshold, the control system performs reverse control to disconnect the redundant power supply.

[0015] Preferably, an undervoltage fault signal is output synchronously when the redundant power supply is disconnected.

[0016] Preferably, the number is reset to zero simultaneously when the redundant power supply is disconnected.

[0017] The present invention also provides a motor controller power supply control circuit, comprising:

[0018] A main power supply circuit, comprising a main power supply and a main power supply switching switch, wherein the main power supply is powered by a low-voltage battery;

[0019] A redundant power supply circuit, comprising a redundant power supply and a redundant power supply switching switch, wherein the redundant power supply is powered by a high-voltage battery;

[0020] The control system is connected to the main power supply circuit and the redundant power supply circuit through the main power supply switching switch and the redundant power supply switching switch, and is powered by the main power supply / redundant power supply;

[0021] The switching control circuit is connected to the low-voltage battery through the low-voltage battery detection circuit and to the high-voltage battery through the high-voltage battery detection circuit to monitor the voltage of the low-voltage battery and the high-voltage battery; at the same time, it is connected to the main power switching switch, the redundant power switching switch and the control system to control the on-off of the main power supply circuit / redundant power supply circuit to the control system;

[0022] Close the main power supply switch and open the redundant power supply switch to connect the main power supply circuit to the control system power supply;

[0023] A low-voltage detection circuit is used to monitor the voltage of the low-voltage battery in real time. When the switching control circuit detects that the voltage of the low-voltage battery is lower than a first threshold, the redundant power switching switch is closed and the main power switching switch is opened at the same time.

[0024] A high-voltage detection circuit is used to monitor the voltage of the high-voltage battery in real time. When the voltage of the high-voltage battery is detected to be lower than a second threshold, the control system reversely controls the disconnection of the redundant power supply based on the switching control circuit.

[0025] Preferably, based on the switching control circuit, when it is monitored that the voltage of the low-voltage battery is higher than a third threshold, the redundant power switching switch is opened and the main power switching switch is closed.

[0026] Preferably, the main power supply circuit and the redundant power supply circuit further include a filter circuit / surge protection circuit.

[0027] Preferably, anti-backflow circuits are respectively arranged between the main power supply circuit and the redundant power supply circuit and the control system.

[0028] Preferably, the switching control circuit includes:

[0029] The first signal input terminal receives the closing / opening state signal of the main power switching switch and the redundant power switching switch;

[0030] A second signal input terminal is used to input a command signal of the control system;

[0031] The MOS tube and the converter are used to control the on and off of the redundant power supply circuit according to the signal output input by the first signal input terminal and the second signal input terminal.

[0032] Compared with the existing technology, the above technical solution has the following beneficial effects:

[0033] The present application provides a motor controller power supply control method and control circuit. When the main power supply voltage is abnormal, the redundant power supply switching switch is closed and the main power supply switching switch is disconnected, so that the redundant power supply supplies power to the control system, and the high-voltage battery voltage of the redundant power supply is detected. When the high-voltage battery voltage is abnormal, the control system reverses the instruction control to disconnect the redundant power supply. Software and hardware control are used to ensure that the redundant power supply can be normally and quickly cut in when the main power low-voltage control system is abnormal, and automatically disconnect and do not work when the high-voltage battery voltage is very low (i.e., abnormal operation). This solves the problem that the existing redundant power supply only relies on hardware to cut in, and cannot be cut out when the high-voltage battery exceeds the safe operating voltage range, posing a safety hazard. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a flow chart of a first embodiment of a power supply control method and control circuit for a motor controller according to the present invention;

[0035] Figure 2 This is a circuit diagram of a second embodiment of a power supply control method and control circuit for a motor controller according to the present invention;

[0036] Figure 3This is a schematic diagram of a switching control circuit in a second embodiment of a power supply control method and control circuit for a motor controller according to the present invention. DETAILED DESCRIPTION

[0037] The advantages of the present invention are further described below with reference to the accompanying drawings and specific embodiments.

[0038] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0039] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0040] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining."

[0041] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0042] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal communication between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0043] In the following description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present invention and have no specific meaning. Therefore, "module" and "component" can be used interchangeably.

[0044] Embodiment 1: The present invention discloses a motor controller power supply control method, which is used based on the existing motor redundant power supply control, combining software and hardware control, so that when the high-voltage battery voltage is very low, the redundant power supply is disconnected and does not work, and can be normally switched on in the low-voltage control system regardless of the load.

[0045] Specifically, a main power supply and a redundant power supply are provided to control the power supply of the control system, wherein the main power supply is powered by a low-voltage battery and the redundant power supply is powered by a high-voltage battery. This embodiment is applied to the motor control power system in which the redundant power supply and the main power supply exist, and therefore includes the main power supply and the redundant power supply. The main power supply KL30 provides an operating voltage, generally 9V to 18V. When it is lower than 7V, it is abnormal. At this time, it is necessary to switch to the redundant power supply to power the control system. Based on this, refer to Figure 1 ,include:

[0046] S100: Close the main power switch and open the redundant power switch, so that the main power supply is connected to the control system for power supply;

[0047] In the above steps, the vehicle is in normal operation and there is no main power abnormality. The control system is powered by the main power supply, the redundant power supply is not working, and the redundant power supply switching switch is disconnected (that is, it is disconnected in hardware). Prior to this, it includes power-on and initialization.

[0048] S200: Using a low-voltage detection circuit to monitor the voltage of the low-voltage battery in real time (S200-1). When the voltage of the low-voltage battery is detected to be lower than a first threshold, the redundant power supply switch is closed and the main power supply switch is opened (S200-2).

[0049] As mentioned above, when the main power supply is lower than 7V, an abnormal state occurs. At this time, the redundant power supply needs to be switched in. That is, the above-mentioned first threshold is 7V, and the main power supply switch is disconnected at the same time. At this time, closing the redundant power supply switch is also a hardware operation. That is, no matter how heavy the low-voltage control system is loaded, if KL30 suddenly loses power, the redundant power supply can still work normally.

[0050] S300: A high-voltage detection circuit is used to monitor the voltage of the high-voltage battery in real time (S300-1). When the voltage of the high-voltage battery is detected to be lower than a second threshold, the control system reverses the instruction to control and disconnect the redundant power supply (S300-2).

[0051] In this embodiment, as mentioned above, the long-term operating voltage of the isolation transformer generally designed for redundant power supply is not less than 230V. If the isolation transformer works at low voltage for a long time, it will generate heat and seriously affect its service life. Therefore, when the voltage of the high-voltage battery is lower than the second threshold (i.e. the above-mentioned 230V), it needs to be cut off. At this time, the control system software controls the cut-off, which solves the problem that the existing system only relies on hardware cut-in and cannot disconnect the redundant power supply in the above-mentioned situation.

[0052] Furthermore, since electromagnetic interference may be generated in the circuit during the motor control process, this may cause the high-voltage detection circuit to detect a voltage lower than 230V. However, there is no need to disconnect the redundant power supply at this time. To reduce erroneous operations caused by such situations, before the control system reverses control and disconnects the redundant power supply, the following steps are also included:

[0053] S310: Calculate the number of times the monitored high-voltage battery voltage is lower than the second threshold. When the number exceeds the fourth threshold, the control system reverses control to disconnect the redundant power supply. That is, after the high-voltage detection circuit continuously samples multiple times and confirms that the collected high-voltage battery voltage is lower than 230V, it is confirmed that the redundant power supply is in an abnormal working state, and the redundant power supply is disconnected at this time.

[0054] When the redundant power supply is disconnected, the following operations may also be included: S311: synchronously outputting an undervoltage fault signal when the redundant power supply is disconnected. And / or, S312: synchronously clearing the number of times when the redundant power supply is disconnected. That is, as an illustration, when the redundant power supply is disconnected, the control system cannot obtain power supply, and thus a fault signal needs to be output to inform personnel that the control system cannot operate; at the same time, the above count needs to be cleared to re-count when the voltage of the above high-voltage battery is collected again and is lower than 230V. Alternatively, the count may be performed without clearing, that is, the redundant power supply is disconnected when the difference between the current count and the initial count exceeds the fourth threshold. In addition, the operations of the above two steps S311 and S312 can be swapped in order and performed synchronously with the disconnection of the redundant power supply.

[0055] S400: When the redundant power supply switching switch is closed and the voltage of the high-voltage battery is monitored to be lower than the threshold value: when the voltage of the low-voltage battery is monitored to be higher than the third threshold value, the redundant power supply switching switch is opened and the main power supply switching switch is closed.

[0056] In the above steps S200-S300, the control system is powered by the redundant power supply. In the above steps, that is, after the redundant power supply switching switch is closed for a period of time, the voltage of the low-voltage battery recovers to higher than 9V (the third threshold value), that is, it is in its safe operating condition. At this time, the redundant power supply switching switch is continued to be disconnected and switched to the initial state as in step S100, that is, the control system is powered by the main power supply (low-voltage power supply).

[0057] In this embodiment, based on the aforementioned steps, the motor control system closes the main power supply switch and disconnects the redundant power supply switch, allowing the main power supply to power the control system. When the main power supply voltage is abnormal, the redundant power supply switch is closed and disconnected, allowing the redundant power supply to power the control system. The high-voltage battery voltage of the redundant power supply is then detected. When the high-voltage battery voltage is abnormal, the control system reverses the command and controls to disconnect the redundant power supply, i.e., disconnects it through software control. When the low-voltage battery voltage returns to normal, the main power supply switch is reclosed. This combined software and hardware control provides a control system that can disable the redundant power supply when the high-voltage battery voltage is very low, while still enabling normal switching in the low-voltage control system regardless of load. Furthermore, during this process, multiple sampling and judgment are performed to reduce false positives caused by electromagnetic interference in the circuit.

[0058] Embodiment 2: The present invention also provides a motor controller power supply control circuit for implementing the power supply control method as described in embodiment 1, which is configured as a power supply circuit including a redundant power supply. Figure 2 ,include:

[0059] A main power supply circuit, comprising a main power supply and a main power supply switching switch, wherein the main power supply is powered by a low-voltage battery;

[0060] A redundant power supply circuit, comprising a redundant power supply and a redundant power supply switching switch, wherein the redundant power supply is powered by a high-voltage battery;

[0061] The control system is connected to the main power supply circuit and the redundant power supply circuit through the main power supply switching switch and the redundant power supply switching switch, and is powered by the main power supply / redundant power supply;

[0062] The switching control circuit is connected to the low-voltage battery through the low-voltage battery detection circuit and to the high-voltage battery through the high-voltage battery detection circuit to monitor the voltage of the low-voltage battery and the high-voltage battery; at the same time, it is connected to the main power switching switch, the redundant power switching switch and the control system to control the on-off of the main power supply circuit / redundant power supply circuit to the control system;

[0063] Specifically, based on the above-mentioned main power supply circuit, redundant power supply circuit, control system and switching control circuit, the following is achieved: the main power switching switch is closed, and the redundant power switching switch is disconnected, so that the main power supply circuit is connected to the control system for power supply; a low-voltage detection circuit is used to monitor the voltage of the low-voltage battery in real time. When the switching control circuit detects that the voltage of the low-voltage battery is lower than a first threshold, the redundant power switching switch is closed and the main power switching switch is disconnected at the same time; a high-voltage detection circuit is used to monitor the voltage of the high-voltage battery in real time. When the voltage of the high-voltage battery is higher than a second threshold, the switching control circuit is used to disconnect the redundant power supply through reverse instructions of the control system.

[0064] In this embodiment, as described in the first embodiment above, when the low-voltage battery voltage is lower than 7V, the redundant power supply switching switch is closed, so that the redundant power supply circuit operates and the high-voltage battery voltage used to supply the redundant power supply circuit is monitored. When it is lower than 230V, that is, there may be a safety risk, the control system software (instructions) controls the disconnection of the redundant power supply to overcome the problem that the existing hardware-dependent redundant power supply cannot monitor the high-voltage battery voltage status after switching in and cannot be switched out when it exceeds the safe operating range. The above-mentioned low-voltage detection circuit and high-voltage detection circuit can realize voltage sampling of the low-voltage battery and the high-voltage battery by including but not limited to circuits arranging resistor voltage dividers.

[0065] As a further supplement, based on the above-mentioned switching control circuit, when it is monitored that the voltage of the low-voltage battery is higher than the third threshold, the redundant power supply switching switch is disconnected and the main power supply switching switch is closed. That is, after the redundant power supply switching switch is closed for a period of time, the voltage of the low-voltage battery recovers to higher than 9V (the third threshold), that is, it is in its safe operating condition. At this time, the redundant power supply switching switch continues to be disconnected, so that the main power supply supplies power to the control system.

[0066] Specifically, in this embodiment, the switching control circuit not only obtains the hardware closed / open state signals of the main power switching switch and the redundant power switching switch, but also controls the on / off of the redundant power supply circuit according to the instructions of the control system. The input and output of software and hardware signals can be realized by arranging a circuit formed by semiconductor devices such as resistors, MOS tubes (Q1), and converters (U1).

[0067] By way of example and not limitation, Figure 3The switching control circuit can be configured to include: a first signal input terminal for inputting on / off status signals of the main power switching switch and the redundant power switching switch; a second signal input terminal for inputting command signals from the control system; a MOS transistor and a converter for outputting control of the redundant power supply circuit based on the signals input from the first and second signal input terminals. More specifically, the first and second signal input terminals are connected to the MOS transistor input terminals, respectively, and the output terminal is connected to the converter, which outputs a redundant power supply circuit shutdown signal. For example, when controlling the redundant power supply circuit, if the hardware control signal RP_ON_HW transitions to H (the redundant power switching switch is closed), and then the software control signal RP_ON_SW is set to H (i.e., the control system issues a reverse control instruction), the redundant power switching switch K_Rp control signal PR_ON will transition to H, connecting the redundant power supply circuit. When the low-voltage battery voltage is detected to be greater than 9V, the hardware control signal RP_ON_HW transitions to L (the redundant power switching switch is open), and the redundant power switching switch control signal PR_ON will transition to L, disconnecting the redundant power supply circuit. Monitor the high-voltage battery voltage in real time. When it is lower than 230V, the software control signal RP_ON_SW is set to L, disconnecting the redundant power supply circuit.

[0068] In addition to the above examples, other existing circuits that can realize the combination of software output signals and hardware output signals through the above semiconductor devices can also be used as switching control circuits, which are not particularly limited here.

[0069] In this embodiment, preferably, the main power supply circuit and the redundant power supply circuit also include a filter circuit / surge protection circuit. Specifically, as an example, a filter circuit and a surge protection circuit are arranged between the low-voltage battery and the main power switching switch, and the low-voltage battery detection circuit is connected to the switching control circuit at the output end of the filter circuit and the surge protection circuit, thereby further reducing the interference in the circuit during the low-voltage detection process, resulting in inaccurate detection results, and causing the redundant power supply circuit to be incorrectly cut off. In the redundant power supply circuit, a filter circuit is set between the redundant power supply and the redundant power switching switch, and the redundant power supply and the filter circuit are connected by a fuse. The redundant power supply is connected and powered by the high-voltage battery through an isolated DC / DC conversion circuit. The redundant power supply is also connected to the lower bridge drive circuit and the safety logic circuit to achieve safe energy supply to the control system.

[0070] Furthermore, anti-backflow circuits are respectively arranged between the main power supply circuit and the redundant power supply circuit and the control system. A reverse connection circuit can also be arranged before the input of the main power supply switching switch in the main power supply circuit to further improve the safety of the motor controller power supply control circuit during use.

[0071] It should be noted that the embodiments of the present invention have better practicability and do not impose any form of limitation on the present invention. Any technician familiar with the field may use the technical content disclosed above to change or modify it into an equivalent effective embodiment. However, any modification or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A motor controller power supply control method, characterized in that: include: Providing a main power supply and a redundant power supply, wherein the main power supply is powered by a low-voltage battery and the redundant power supply is powered by a high-voltage battery; Close the main power switch and open the redundant power switch to connect the main power supply to the control system. A low-voltage detection circuit is used to monitor the voltage of the low-voltage battery in real time. When the voltage of the low-voltage battery is detected to be lower than a first threshold, the hardware closes the redundant power supply switching switch and simultaneously opens the main power supply switching switch. A high-voltage detection circuit is used to monitor the voltage of the high-voltage battery in real time. When the voltage of the high-voltage battery is detected to be lower than a second threshold, the control system reverses the instruction to control and disconnect the redundant power supply. The switching control circuit obtains the hardware closed / open state signals of the main power switching switch and the redundant power switching switch, and controls the on / off of the redundant power supply circuit according to the instructions of the control system, realizing the input and output of software and hardware signals; When the redundant power supply switch is closed and the voltage of the high-voltage battery is detected to be lower than the second threshold: When it is monitored that the voltage of the low-voltage battery is higher than the third threshold, the redundant power supply switching switch is opened and the main power supply switching switch is closed.

2. The power supply control method according to claim 1, wherein: Before the control system reverses control and disconnects the redundant power supply, it also includes: The number of times the monitored high-voltage battery voltage is lower than the second threshold is calculated. When the number exceeds a fourth threshold, the control system performs reverse control to disconnect the redundant power supply.

3. The power supply control method according to claim 2, wherein: When the redundant power supply is disconnected, an undervoltage fault signal is output synchronously.

4. The power supply control method according to claim 2, wherein: The number of times is reset to zero when the redundant power supply is disconnected.

5. A motor controller power supply control circuit, characterized in that: include: A main power supply circuit, comprising a main power supply and a main power supply switching switch, wherein the main power supply is powered by a low-voltage battery; A redundant power supply circuit, comprising a redundant power supply and a redundant power supply switching switch, wherein the redundant power supply is powered by a high-voltage battery; The control system is connected to the main power supply circuit and the redundant power supply circuit through the main power supply switching switch and the redundant power supply switching switch, and is powered by the main power supply / redundant power supply; The switching control circuit is connected to the low-voltage battery through the low-voltage battery detection circuit and to the high-voltage battery through the high-voltage battery detection circuit to monitor the voltage of the low-voltage battery and the high-voltage battery; at the same time, it is connected to the main power switching switch, the redundant power switching switch and the control system to control the on-off of the main power supply circuit / redundant power supply circuit to the control system; Close the main power supply switch and open the redundant power supply switch to connect the main power supply circuit to the control system power supply; A low-voltage detection circuit is used to monitor the voltage of the low-voltage battery in real time. When the switching control circuit detects that the voltage of the low-voltage battery is lower than a first threshold, the redundant power switching switch is closed and the main power switching switch is opened at the same time. A high-voltage detection circuit is used to monitor the voltage of the high-voltage battery in real time. When the voltage of the high-voltage battery is detected to be lower than a second threshold, the control system controls the disconnection of the redundant power supply based on a reverse instruction of the switching control circuit. The switching control circuit includes: The first signal input terminal receives the closing / opening state signal of the main power switching switch and the redundant power switching switch; A second signal input terminal is used to input a command signal of the control system; The MOS tube and the converter are used to control the on / off of the redundant power supply circuit according to the signal output input from the first signal input terminal and the second signal input terminal; Based on the switching control circuit, when it is monitored that the voltage of the low-voltage battery is higher than the third threshold, the redundant power switching switch is opened and the main power switching switch is closed.

6. The power supply control circuit according to claim 5, wherein: The main power supply circuit and the redundant power supply circuit also include a filter circuit / surge protection circuit.

7. The power supply control circuit according to claim 5, wherein: Anti-backflow circuits are also arranged between the main power supply circuit and the redundant power supply circuit and the control system.

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