Low-voltage circuit control method, apparatus and system, and device and storage medium

Abstract

A low-voltage circuit control method, which is applied to a power management unit (11) in a low-voltage circuit control system (10), comprises: when the current of a low-voltage loop is greater than a preset current, determining, on the basis of voltages at two ends of a power management unit, whether a fault point of a low-voltage circuit control system is located in a second low-voltage loop (14); then, when the fault point is not located in the second low-voltage loop, controlling a direct-current converter (12) to be turned off, and on the basis of the current of the low-voltage loop after the direct-current converter is turned off, determining a turned-on / turned-off state of the power management unit, such that at least the second low-voltage loop can work normally; and when the fault point is located in the second low-voltage loop, controlling the power management unit to be in the turned-off state, such that the first low-voltage loop (13) can work normally. A low-voltage circuit control apparatus, which is applied to a power management unit in a low-voltage circuit control system. An electronic device, which implements a low-voltage circuit control method. A computer-readable storage medium, wherein when stored computer execution instructions are executed by a processor of an electronic device, the electronic device can execute a low-voltage circuit control method. A low-voltage circuit control system, comprising a direct-current converter, a low-voltage circuit, and a power management unit for executing a low-voltage circuit control method. The low-voltage circuit control system consists of a single storage battery (141) and a single direct-current converter (12), and therefore the costs can be effectively reduced.

Description

Low voltage circuit control method, device, equipment, storage medium and system Technical Field

[0001] The present application relates to the field of vehicle control technology, in particular to the field of vehicle power supply technology, and specifically to a low-voltage circuit control method, device, equipment, storage medium and system. Background Art

[0002] To ensure the reliability of intelligent driving, it is necessary to ensure the normal low-voltage power supply to electrical appliances such as the vehicle controller. Furthermore, to ensure driving safety, it is necessary to ensure the normal low-voltage power supply to safety-critical components such as the chassis braking system and steering system. To meet these requirements, the following method is usually adopted: a DC converter is connected to two battery circuits, and both battery circuits simultaneously power the low-voltage electrical appliances.

[0003] However, the above method requires the installation of two batteries, which increases the hardware cost of vehicle manufacturing. Therefore, how to control the low-voltage circuit at a low cost is a technical problem that needs to be solved urgently.

[0004] Summary of the Invention

[0005] This application provides a low-voltage circuit control method, device, equipment, storage medium, and system to at least solve the technical problem of the inability to control low-voltage circuits at low cost in related technologies. The technical solution of this application is as follows:

[0006] According to a first aspect provided by the present application, a low-voltage circuit control method is provided, which is applied to a power management unit in a low-voltage circuit control system. The low-voltage circuit control system also includes: a DC converter and a low-voltage circuit; the low-voltage circuit includes a first low-voltage circuit and a second low-voltage circuit; the power management unit is used to control the on and off of the second low-voltage circuit; the DC converter is used to supply power to the load in the first low-voltage circuit, and to supply power to the load in the second low-voltage circuit when the power management unit is in a closed state; the second low-voltage circuit also includes a battery; the battery is used to supply power to the load in the second low-voltage circuit when the power management unit is in a disconnected state, and to supply power to the load in the second low-voltage circuit when the power management unit is in a disconnected state. When the power management unit is in a closed state and the DC converter is in a disconnected state, power is supplied to loads in the first low-voltage circuit and the second low-voltage circuit. The method includes: when the current of the low-voltage circuit is greater than a preset current, judging whether the fault point of the low-voltage circuit control system is located in the second low-voltage circuit based on the voltage across the power management unit; when the fault point is not located in the second low-voltage circuit, controlling the DC converter to be in a disconnected state, and determining the on-off state of the power management unit based on the current of the low-voltage circuit after the DC converter is in the disconnected state; and when the fault point is located in the second low-voltage circuit, controlling the power management unit to be in a disconnected state.

[0007] According to the above technical means, the present application can determine that the low-voltage circuit is in an overcurrent state, i.e., a fault in the low-voltage circuit control system, when the current in the low-voltage circuit exceeds a preset current. Subsequently, the voltage across the power management unit can be used to determine whether the fault in the low-voltage circuit control system is located in the second low-voltage circuit. Furthermore, if the fault is not located in the second low-voltage circuit, the current in the low-voltage circuit after the DC converter is disconnected can be used to determine whether the fault is located in the DC converter, and the on / off state of the power management unit can be determined. This ensures that at least the second low-voltage circuit operates normally, allowing the vehicle to enter a safe state even if the low-voltage circuit control system fails. If the fault is located in the second low-voltage circuit, the power management unit is controlled to be disconnected, thereby ensuring that the first low-voltage circuit operates normally, allowing the vehicle to enter a safe state even if the low-voltage circuit control system fails. Furthermore, the low-voltage circuit control method proposed in the present application is applied to the power management unit in a low-voltage circuit control system, wherein the low-voltage circuit control system also includes a DC converter, a first low-voltage circuit, and a second low-voltage circuit, and the second low-voltage circuit also includes a battery. In this way, the manufacturing cost can be effectively reduced by providing a single DC converter and a single battery.

[0008] In a possible embodiment, the first end of the power management unit is connected to the DC converter and the first low-voltage circuit, respectively, and the second end of the power management unit is connected to the second low-voltage circuit; when the current of the low-voltage circuit is greater than the preset current, the voltage at both ends of the power management unit is used to determine whether the fault point of the low-voltage circuit control system is located in the second low-voltage circuit, including: when the current of the low-voltage circuit is greater than the preset current and the voltage of the first end of the power management unit is greater than the voltage of the second end of the power management unit, determining that the fault point is located in the second low-voltage circuit; when the current of the low-voltage circuit is greater than the preset current and the voltage of the first end of the power management unit is less than the voltage of the second end of the power management unit, determining that the fault point is not located in the second low-voltage circuit.

[0009] According to the above technical means, when the voltage at the first terminal of the power management unit is greater than the voltage at the second terminal of the power management unit, the present application can determine that the current direction is flowing from the first terminal of the power management unit to the second terminal of the power management unit, indicating that the fault point is located in the second low-voltage circuit. Furthermore, based on the voltage at both ends of the power management unit, it is possible to accurately determine whether the fault point is located in the second low-voltage circuit.

[0010] In one possible implementation, the on / off state of the power management unit is determined based on the current of the low-voltage circuit after the DC converter is in the disconnected state, including: after the DC converter is in the disconnected state, if the current of the low-voltage circuit is greater than a preset current, controlling the power management unit to be in the disconnected state; after the DC converter is in the disconnected state, if the current of the low-voltage circuit is less than a preset current, controlling the power management unit to be in the closed state.

[0011] According to the above technical means, after the DC converter is in the disconnected state, the present application can determine whether the fault point is located in the first low-voltage circuit or the DC converter based on the current in the low-voltage circuit. Thus, if the current in the low-voltage circuit is greater than the preset current, that is, the fault point is located in the first low-voltage circuit, the power management unit is controlled to be disconnected, enabling the normal operation of the second low-voltage circuit. Conversely, if the current in the low-voltage circuit is less than the preset current, that is, the fault point is located in the DC converter, the power management unit is controlled to be closed, enabling the normal operation of the first and second low-voltage circuits.

[0012] In a possible embodiment, the above method also includes: when the voltage of the low-voltage circuit is greater than a preset voltage, controlling the DC converter to be in a disconnected state, and determining the on-off state of the power management unit based on the voltage of the low-voltage circuit after the DC converter is in the disconnected state.

[0013] According to the above technical means, the present application can determine that an overvoltage fault has occurred in the low-voltage circuit control system when the voltage of the low-voltage circuit is greater than a preset voltage. Furthermore, the DC converter is controlled to be in a disconnected state, and based on the voltage of the low-voltage circuit after the DC converter is disconnected, it can be determined whether the overvoltage fault point of the low-voltage circuit control system is located in the DC converter, thereby determining the on / off state of the power management unit to ensure normal operation of the low-voltage circuit control system.

[0014] In one possible embodiment, the above-mentioned determination of the on-off state of the power management unit based on the voltage of the low-voltage circuit after the DC converter is in the disconnected state includes: after the DC converter is in the disconnected state, if the voltage of the low-voltage circuit is greater than a preset voltage, controlling the power management unit to be in the disconnected state; after the DC converter is in the disconnected state, if the voltage of the low-voltage circuit is less than a preset voltage, controlling the power management unit to be in the closed state.

[0015] According to the above technical means, when the DC converter is in the disconnected state, if the voltage of the low-voltage circuit is less than the preset voltage, it indicates that the overvoltage fault point is located in the DC converter. In this way, the power management unit is controlled to be in the closed state, so that the first and second low-voltage circuits can operate normally.

[0016] According to the second aspect provided by the present application, a low-voltage circuit control device is provided, which is applied to a power management unit in a low-voltage circuit control system. The low-voltage circuit control system also includes: a DC converter, a low-voltage circuit; the low-voltage circuit includes a first low-voltage circuit and a second low-voltage circuit; the power management unit is used to control the on and off of the second low-voltage circuit; the DC converter is used to supply power to the load in the first low-voltage circuit, and to supply power to the load in the second low-voltage circuit when the power management unit is in a closed state; the second low-voltage circuit also includes a battery; the battery is used to supply power to the load in the second low-voltage circuit when the power management unit is in a disconnected state, and to supply power to the load in the second low-voltage circuit when the power management unit is in a closed state and the DC converter is used to control the on and off of the second low-voltage circuit. When the DC converter is in a disconnected state, power is supplied to the loads in the first low-voltage circuit and the second low-voltage circuit; the low-voltage circuit control device includes a determination unit, a processing unit and a control unit; the determination unit is used to determine whether the fault point of the low-voltage circuit control system is located in the second low-voltage circuit according to the voltage across the power management unit when the current of the low-voltage circuit is greater than a preset current; the processing unit is used to control the DC converter to be in a disconnected state when the fault point is not located in the second low-voltage circuit, and determine the on-off state of the power management unit according to the current of the low-voltage circuit after the DC converter is in the disconnected state; the control unit is used to control the power management unit to be in a disconnected state when the fault point is located in the second low-voltage circuit.

[0017] In one possible embodiment, the first end of the power management unit is connected to the DC converter and the first low-voltage circuit, respectively, and the second end of the power management unit is connected to the second low-voltage circuit; the determination unit is specifically used to: when the current of the low-voltage circuit is greater than the preset current and the voltage of the first end of the power management unit is greater than the voltage of the second end of the power management unit, determine that the fault point is located in the second low-voltage circuit; when the current of the low-voltage circuit is greater than the preset current and the voltage of the first end of the power management unit is less than the voltage of the second end of the power management unit, determine that the fault point is not located in the second low-voltage circuit.

[0018] In one possible embodiment, the above-mentioned processing unit is specifically used to: after the DC converter is in the disconnected state, if the current of the low-voltage circuit is greater than the preset current, control the power management unit to be in the disconnected state; after the DC converter is in the disconnected state, if the current of the low-voltage circuit is less than the preset current, control the power management unit to be in the closed state.

[0019] In a possible embodiment, the above-mentioned processing unit is also used to: when the voltage of the low-voltage circuit is greater than a preset voltage, control the DC converter to be in a disconnected state, and determine the on-off state of the power management unit based on the voltage of the low-voltage circuit after the DC converter is in the disconnected state.

[0020] In one possible embodiment, the above-mentioned processing unit is specifically used to: after the DC converter is in the disconnected state, if the voltage of the low-voltage circuit is greater than the preset voltage, control the power management unit to be in the disconnected state; after the DC converter is in the disconnected state, if the voltage of the low-voltage circuit is less than the preset voltage, control the power management unit to be in the closed state.

[0021] According to the third aspect provided by the present application, an electronic device is provided, comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute instructions to implement the method of the above-mentioned first aspect and any possible implementation method thereof.

[0022] According to the fourth aspect provided by the present application, a computer-readable storage medium is provided. When the instructions in the computer-readable storage medium are executed by the processor of an electronic device, the electronic device is enabled to execute the method of the above-mentioned first aspect and any possible implementation method thereof.

[0023] According to the fifth aspect provided by the present application, a low-voltage circuit control system is provided, comprising: a DC converter, a low-voltage circuit, and a power management unit for executing the method of the above-mentioned first aspect and any possible implementation method thereof; the low-voltage circuit comprises a first low-voltage circuit and a second low-voltage circuit; the power management unit is used to control the on and off of the second low-voltage circuit; the DC converter is used to supply power to the load in the first low-voltage circuit, and to supply power to the load in the second low-voltage circuit when the power management unit is in a closed state; the second low-voltage circuit also includes a battery; the battery is used to supply power to the load in the second low-voltage circuit when the power management unit is in a disconnected state, and to supply power to the load in the first low-voltage circuit and the second low-voltage circuit when the power management unit is in a closed state and the DC converter is in a disconnected state.

[0024] According to the sixth aspect provided by the present application, a computer program product is provided, which includes computer instructions. When the computer instructions are executed on an electronic device, the electronic device executes the method of the above-mentioned first aspect and any possible implementation method thereof.

[0025] Therefore, the above technical features of this application have the following beneficial effects:

[0026] (1) When the fault point is not located in the second low-voltage circuit, the current of the low-voltage circuit after the DC converter is in the disconnected state can be used to determine whether the fault point of the low-voltage circuit control system is located in the DC converter, and the on-off state of the power management unit can be determined, so that at least the second low-voltage circuit can operate normally, so that when the low-voltage circuit control system fails, the vehicle can still enter a safe state. When the fault point is located in the second low-voltage circuit, the power management unit is controlled to be in the disconnected state, so that the first low-voltage circuit can operate normally, so that when the low-voltage circuit control system fails, the vehicle can still enter a safe state. At the same time, the low-voltage circuit control method proposed in this application is applied to the power management unit in the low-voltage circuit control system, and the low-voltage circuit control system also includes a DC converter, a first low-voltage circuit, and a second low-voltage circuit, and the second low-voltage circuit also includes a battery. In this way, the manufacturing cost can be effectively reduced by providing a single DC converter and a single battery.

[0027] (2) If the voltage at the first terminal of the power management unit is greater than the voltage at the second terminal of the power management unit, it can be determined that the current is flowing from the first terminal of the power management unit to the second terminal of the power management unit, indicating that the fault point is located in the second low-voltage circuit. Furthermore, the voltages at both ends of the power management unit can be used to accurately determine whether the fault point is located in the second low-voltage circuit.

[0028] (3) When the current of the low-voltage circuit is greater than the preset current, that is, the fault point is located in the first low-voltage circuit, the power management unit is controlled to be in the disconnected state, so that the second low-voltage circuit can operate normally. At the same time, when the current of the low-voltage circuit is less than the preset current, that is, the fault point is located in the DC converter, the power management unit is controlled to be in the closed state, so that the first and second low-voltage circuits can operate normally.

[0029] (4) It is possible to determine whether the overvoltage fault point of the low-voltage circuit control system is located at the DC converter, thereby determining the on / off state of the power management unit to enable the low-voltage circuit control system to operate normally.

[0030] (5) After the DC converter is in the disconnected state, if the voltage of the low-voltage circuit is less than the preset voltage, it means that the overvoltage fault point is located in the DC converter. In this way, the control power management unit is in the closed state, which can enable the first low-voltage circuit and the second low-voltage circuit to operate normally.

[0031] It should be noted that the technical effects brought about by any implementation method in the second to sixth aspects can refer to the technical effects brought about by the corresponding implementation method in the first aspect, and will not be repeated here.

[0032] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0034] FIG1 is a schematic structural diagram of a low-voltage circuit control system according to an exemplary embodiment;

[0035] FIG2 is a flow chart showing a low voltage circuit control method according to an exemplary embodiment;

[0036] FIG3 is a flow chart showing another low-voltage circuit control method according to an exemplary embodiment;

[0037] FIG4 is a flow chart showing another low-voltage circuit control method according to an exemplary embodiment;

[0038] FIG5 is a block diagram of a low-voltage circuit control device according to an exemplary embodiment;

[0039] Fig. 6 is a block diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0040] In order to enable ordinary people in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0041] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0042] Before giving a detailed introduction to the low-voltage circuit control method provided by the present application, a brief introduction to the implementation environment (implementation architecture) involved in the present application is first given.

[0043] The low-voltage circuit control method provided in the embodiment of the present application can be applied to the power management unit in the low-voltage circuit control system. Figure 1 shows a structural schematic diagram of the low-voltage circuit control system 10. As shown in Figure 1, the low-voltage circuit control system 10 includes a power management unit 11, a DC converter 12, a first low-voltage circuit 13, a second low-voltage circuit 14, and a load (Figure 1 shows a load 15 as an example. In actual application, there may be more or fewer loads, and this application does not limit this).

[0044] Among them, the low-voltage circuit includes a first low-voltage circuit 13 and a second low-voltage circuit 14. The first end of the power management unit 11 is connected to the DC converter 12 and the first low-voltage circuit 13 respectively, and the second end of the power management unit 11 is connected to the second low-voltage circuit 14. The first low-voltage circuit 13 includes a load (Figure 1 exemplarily shows loads 131 and 132. In actual application, there may be more or fewer loads, and this application does not limit this), and the second low-voltage circuit 14 includes a battery 141 and a load (Figure 1 exemplarily shows loads 142 and 143. In actual application, there may be more or fewer loads, and this application does not limit this).

[0045] The power management unit 11 is used to control the on / off of the second low-voltage circuit 14 .

[0046] The DC converter 12 is used to supply power to the load in the first low-voltage circuit 13 , and to supply power to the load in the second low-voltage circuit 14 when the power management unit 11 is in a closed state.

[0047] The battery 15 is used to supply power to the load in the second low-voltage circuit 14 when the power management unit 11 is in the disconnected state, and to supply power to the load in the first low-voltage circuit 14 and the second low-voltage circuit 12 when the power management unit 11 is in the closed state and the DC converter 12 is in the disconnected state.

[0048] In practical applications, the low-voltage circuit control system provided in the embodiments of the present application can be applied to systems with dual-circuit low-voltage power supply requirements. For a single-controller system, the single controller can be connected to both the first low-voltage circuit and the second low-voltage circuit, such as load 15 shown in Figure 1. For a dual-controller system, the dual controllers can be connected to the first low-voltage circuit and the second low-voltage circuit, such as load 131 and load 142 shown in Figure 1.

[0049] In practical applications, since the high voltage management controller is used to activate the high voltage state of the entire vehicle, and the normal operation of the DC converter depends on the high voltage state of the entire vehicle, the high voltage manager is usually set in the first low voltage circuit.

[0050] For ease of understanding, the low-voltage circuit control method provided in this application is specifically introduced below with reference to the accompanying drawings.

[0051] Figure 2 is a flow chart of a low-voltage circuit control method according to an exemplary embodiment. The low-voltage circuit control method can be applied to a power management unit in a low-voltage circuit control system. As shown in Figure 2, the low-voltage circuit control method includes the following steps:

[0052] S201. When the current of the low-voltage circuit is greater than a preset current, the power management unit determines whether the fault point of the low-voltage circuit control system is located in the second low-voltage circuit based on the voltage across the power management unit.

[0053] As one possible implementation, the power management unit obtains the current of the low-voltage circuit and, if the current of the low-voltage circuit is greater than a preset current, obtains the voltage across the power management unit. Furthermore, based on the voltage across the power management unit, the power management unit determines whether the fault point of the low-voltage circuit control system is located in the second low-voltage circuit.

[0054] In practical applications, the power management unit may be a power management unit or a hardware network separator (HNS). The power management unit may include a metal-oxide-semiconductor field-effect transistor (MOSFET). The direct current (DC / DC) converter may be a direct current (DC / DC).

[0055] For the specific implementation of this step, please refer to the subsequent description of the embodiments of this application and will not be repeated here.

[0056] S202: When the fault point is not located in the second low-voltage circuit, the power management unit controls the DC converter to be in a disconnected state.

[0057] S203 : The power management unit determines the on / off state of the power management unit according to the current of the low-voltage circuit after the DC converter is in the off state.

[0058] As a possible implementation, after the power management unit controls the DC converter to be in the disconnected state, it obtains the current of the low-voltage circuit again and determines the on / off state of the power management unit according to the current of the low-voltage circuit.

[0059] For the specific implementation of this step, please refer to the subsequent description of the embodiments of this application and will not be repeated here.

[0060] S204 : When the fault point is located in the second low-voltage circuit, the power management unit is controlled to be in a disconnected state.

[0061] It is understood that when the current in the low-voltage circuit is greater than a preset current, it can be determined that the low-voltage circuit is in an overcurrent state, i.e., a fault has occurred in the low-voltage circuit control system. Subsequently, the voltage across the power management unit can be used to determine whether the fault point in the low-voltage circuit control system is located in the second low-voltage circuit. Furthermore, if the fault point is not located in the second low-voltage circuit, the current in the low-voltage circuit after the DC converter is disconnected can be used to determine whether the fault point in the low-voltage circuit control system is located in the DC converter, and the on / off state of the power management unit can be determined. This can ensure that at least the second low-voltage circuit operates normally, allowing the vehicle to enter a safe state even if the low-voltage circuit control system fails. If the fault point is located in the second low-voltage circuit, the power management unit is controlled to be disconnected, thereby ensuring that the first low-voltage circuit operates normally, allowing the vehicle to enter a safe state even if the low-voltage circuit control system fails. Furthermore, the low-voltage circuit control method proposed in this application is applied to the power management unit in a low-voltage circuit control system, wherein the low-voltage circuit control system also includes a DC converter, a first low-voltage circuit, and a second low-voltage circuit, and the second low-voltage circuit also includes a battery. In this way, the manufacturing cost can be effectively reduced by providing a single DC converter and a single battery.

[0062] In some embodiments, a first terminal of the power management unit is connected to the DC converter and the first low-voltage circuit, respectively, and a second terminal of the power management unit is connected to the second low-voltage circuit. To accurately determine whether the fault point is located in the second low-voltage circuit, the above S201 can be implemented as follows:

[0063] S301. The power management unit determines that the fault point is located in the second low-voltage circuit when the current of the low-voltage circuit is greater than the preset current and the voltage of the first end of the power management unit is greater than the voltage of the second end of the power management unit.

[0064] As one possible implementation, when the current in the low-voltage circuit is greater than a preset current, the power management unit obtains the voltage across the power management unit. Subsequently, when the voltage at the first terminal of the power management unit is greater than the voltage at the second terminal of the power management unit, the power management unit determines that the fault point is located in the second low-voltage circuit.

[0065] S302: The power management unit determines that the fault point is not located in the second low-voltage circuit when the current of the low-voltage circuit is greater than the preset current and the voltage of the first end of the power management unit is less than the voltage of the second end of the power management unit.

[0066] As one possible implementation, when the current in the low-voltage circuit is greater than a preset current, the power management unit obtains the voltage across the power management unit. Thereafter, when the voltage at the first terminal of the power management unit is less than the voltage at the second terminal of the power management unit, the power management unit determines that the fault point is not located in the second low-voltage circuit.

[0067] It is understood that the first end of the power management unit is connected to the DC converter and the first low-voltage circuit, respectively, and the second end of the power management unit is connected to the second low-voltage circuit. Thus, if the voltage at the first end of the power management unit is greater than the voltage at the second end of the power management unit, the current can be determined to be flowing from the first end of the power management unit to the second end of the power management unit, indicating that the fault point is located in the second low-voltage circuit. Furthermore, the voltages at both ends of the power management unit can be used to accurately determine whether the fault point is located in the second low-voltage circuit.

[0068] In some embodiments, to determine whether the fault point is located in the first low-voltage circuit, the above S203 can be implemented as follows:

[0069] S401 : After the DC converter is in the disconnected state, if the current of the low-voltage circuit is greater than a preset current, the power management unit is controlled to be in the disconnected state.

[0070] As a possible implementation, the power management unit obtains the current of the low-voltage circuit again after the DC converter is in the disconnected state. Thereafter, when the current of the low-voltage circuit is greater than a preset current, the power management unit controls the power management unit to be in the disconnected state.

[0071] S402 : After the DC converter is in the disconnected state, if the current of the low-voltage circuit is less than a preset current, the power management unit is controlled to be in the closed state.

[0072] As a possible implementation, the power management unit obtains the current of the low-voltage circuit again after the DC converter is in the disconnected state. Thereafter, when the current of the low-voltage circuit is less than a preset current, the power management unit controls the power management unit to be in the closed state.

[0073] It is understood that after the DC converter is disconnected, the current in the low-voltage circuit can be used to determine whether the fault is located in the first low-voltage circuit or the DC converter. Thus, if the current in the low-voltage circuit is greater than a preset current, meaning the fault is located in the first low-voltage circuit, the power management unit is controlled to be disconnected, enabling the second low-voltage circuit to operate normally. Conversely, if the current in the low-voltage circuit is less than a preset current, meaning the fault is located in the DC converter, the power management unit is controlled to be closed, enabling the first and second low-voltage circuits to operate normally.

[0074] In some embodiments, in the event of an overvoltage fault in a low-voltage circuit control system, in order to control the normal operation of the low-voltage circuit control system, the low-voltage circuit control method provided in the embodiments of the present application further includes:

[0075] S501 : When the voltage of the low-voltage circuit is greater than a preset voltage, the power management unit controls the DC converter to be in a disconnected state.

[0076] As a possible implementation method, the power management unit obtains the voltage of the low-voltage circuit and, when the voltage of the low-voltage circuit is greater than a preset voltage, sends a disconnect signal to the DC converter through the controller area network (CAN) to control the DC converter to be in a disconnected state.

[0077] S502: The power management unit determines the on / off state of the power management unit according to the voltage of the low-voltage circuit after the DC converter is in the off state.

[0078] It is understood that if the voltage of the low-voltage circuit is greater than a preset voltage, it can be determined that an overvoltage fault has occurred in the low-voltage circuit control system. Furthermore, by controlling the DC converter to be in an off state, and based on the voltage of the low-voltage circuit after the DC converter is in the off state, it can be determined whether the overvoltage fault point of the low-voltage circuit control system is located in the DC converter, thereby determining the on / off state of the power management unit to ensure normal operation of the low-voltage circuit control system.

[0079] In some embodiments, when the overvoltage fault point is located at the DC converter, in order to control the normal operation of the low-voltage circuit control system, the above S502 can be implemented as follows:

[0080] S601 : After the DC converter is in the disconnected state, if the voltage of the low-voltage circuit is greater than a preset voltage, the power management unit is controlled to be in the disconnected state.

[0081] As a possible implementation, the power management unit obtains the voltage of the low-voltage circuit after the DC converter is in the disconnected state. Thereafter, when the voltage of the low-voltage circuit is greater than a preset voltage, the power management unit controls the power management unit to be in the disconnected state.

[0082] S602: After the DC converter is in the disconnected state, if the voltage of the low-voltage circuit is lower than a preset voltage, the power management unit is controlled to be in the closed state.

[0083] As a possible implementation, the power management unit obtains the voltage of the low-voltage circuit after the DC converter is in the disconnected state. Thereafter, when the voltage of the low-voltage circuit is less than a preset voltage, the power management unit controls the power management unit to be in the closed state.

[0084] It is understood that after the DC converter is in the disconnected state, if the voltage of the low-voltage circuit is less than the preset voltage, it means that the overvoltage fault point is located in the DC converter. In this way, controlling the power management unit to be in the closed state can enable the first and second low-voltage circuits to operate normally.

[0085] In some embodiments, when an overcurrent condition occurs in a low-voltage circuit control system, in order to cost-effectively control the normal operation of the low-voltage circuit control system, as shown in FIG3 , the low-voltage circuit control method provided in the embodiment of the present application can also be implemented in the following manner:

[0086] S701: The power management unit obtains the current of the low-voltage circuit.

[0087] S702: When the current of the low-voltage circuit is greater than a preset current, the power management unit obtains the voltage across the power management unit.

[0088] S703: The power management unit determines whether the voltage at the first terminal of the power management unit is greater than the voltage at the second terminal of the power management unit.

[0089] S704: When the voltage at the first terminal of the power management unit is greater than the voltage at the second terminal of the power management unit, the power management unit controls the power management unit to be in a disconnected state.

[0090] S705 : The power management unit controls the DC converter to be in a disconnected state when the voltage at the first terminal of the power management unit is lower than the voltage at the second terminal of the power management unit.

[0091] S706: The power management unit obtains the current of the low-voltage circuit.

[0092] S707: The power management unit determines whether the current of the low-voltage circuit is greater than a preset current.

[0093] S708 : When the current of the low-voltage circuit is greater than a preset current, the power management unit controls the power management unit to be in a disconnected state.

[0094] S709 : When the current of the low-voltage circuit is less than a preset current, the power management unit controls the power management unit to be in a closed state.

[0095] In some embodiments, when an overvoltage state occurs in a low-voltage circuit control system, in order to cost-effectively control the normal operation of the low-voltage circuit control system, as shown in FIG4 , the low-voltage circuit control method provided in the embodiment of the present application can also be implemented in the following manner:

[0096] S801: The power management unit obtains the voltage of the low-voltage circuit.

[0097] S802: When the voltage of the low-voltage circuit is greater than a preset voltage, the power management unit controls the DC converter to be in a disconnected state.

[0098] S803: The power management unit obtains the voltage of the low-voltage circuit.

[0099] S804: The power management unit determines whether the voltage of the low-voltage circuit is greater than a preset voltage.

[0100] S805 : When the voltage of the low-voltage circuit is greater than a preset voltage, the power management unit controls the power management unit to be in a disconnected state.

[0101] S806 : When the voltage of the low-voltage circuit is lower than a preset voltage, the power management unit controls the power management unit to be in a closed state.

[0102] The above mainly introduces the solution provided by the embodiment of the present application from the perspective of method. In order to realize the above functions, the low-voltage circuit control device or electronic device or power management unit includes hardware structures and / or software modules corresponding to the execution of each function. It should be easily appreciated by those skilled in the art that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0103] The embodiment of the present application can, according to the above method, exemplarily divide the functional modules of the low-voltage circuit control device or electronic device or power management unit. For example, the low-voltage circuit control device or electronic device or power management unit may include various functional modules corresponding to the various functional divisions, or two or more functions may be integrated into one processing module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical functional division. There may be other division methods in actual implementation.

[0104] FIG5 is a block diagram of a low-voltage circuit control device according to an exemplary embodiment. The low-voltage circuit control device 900 can be applied to a power management unit in a low-voltage circuit control system. Referring to FIG5 , the low-voltage circuit control device 900 includes a determination unit 901 , a processing unit 902 , and a control unit 903 .

[0105] The determination unit 901 is used to determine whether the fault point of the low-voltage circuit control system is located in the second low-voltage circuit according to the voltage across the power management unit when the current of the low-voltage circuit is greater than the preset current.

[0106] The processing unit 902 is used to control the DC converter to be in the disconnected state when the fault point is not located in the second low-voltage circuit, and determine the on-off state of the power management unit based on the current of the low-voltage circuit after the DC converter is in the disconnected state.

[0107] The control unit 903 is configured to control the power management unit to be in a disconnected state when the fault point is located in the second low-voltage circuit.

[0108] Optionally, the first end of the power management unit is connected to the DC converter and the first low-voltage circuit respectively, and the second end of the power management unit is connected to the second low-voltage circuit. In order to accurately determine whether the fault point is located in the second low-voltage circuit, as shown in Figure 5, the above-mentioned determination unit 901 is specifically used to:

[0109] When the current of the low-voltage circuit is greater than the preset current and the voltage of the first end of the power management unit is greater than the voltage of the second end of the power management unit, it is determined that the fault point is located in the second low-voltage circuit.

[0110] When the current of the low-voltage circuit is greater than the preset current and the voltage of the first end of the power management unit is less than the voltage of the second end of the power management unit, it is determined that the fault point is not located in the second low-voltage circuit.

[0111] Optionally, in order to determine whether the fault point is located in the first low-voltage circuit, as shown in FIG5 , the processing unit 902 is specifically configured to:

[0112] After the DC converter is in the disconnected state, if the current of the low-voltage circuit is greater than the preset current, the power management unit is controlled to be in the disconnected state.

[0113] After the DC converter is in the disconnected state, if the current of the low-voltage circuit is less than the preset current, the power management unit is controlled to be in the closed state.

[0114] Optionally, in the event of an overvoltage fault in the low-voltage circuit control system, in order to control the normal operation of the low-voltage circuit control system, as shown in FIG5 , the processing unit 902 is further configured to:

[0115] When the voltage of the low-voltage circuit is greater than the preset voltage, the DC converter is controlled to be in the disconnected state, and the on-off state of the power management unit is determined according to the voltage of the low-voltage circuit after the DC converter is in the disconnected state.

[0116] Optionally, when the overvoltage fault point is located in the DC converter, in order to control the normal operation of the low-voltage circuit control system, as shown in FIG5 , the processing unit 902 is specifically configured to:

[0117] After the DC converter is in the disconnected state, if the voltage of the low-voltage circuit is greater than the preset voltage, the power management unit is controlled to be in the disconnected state.

[0118] After the DC converter is in the disconnected state, if the voltage of the low-voltage circuit is lower than the preset voltage, the power management unit is controlled to be in the closed state.

[0119] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0120] FIG6 is a block diagram of an electronic device according to an exemplary embodiment. As shown in FIG6 , the electronic device 1000 includes but is not limited to: a processor 1001 and a memory 1002 .

[0121] The memory 1002 is used to store executable instructions of the processor 1001. It is understandable that the processor 1001 is configured to execute instructions to implement the low-voltage circuit control method in the above embodiment.

[0122] It should be noted that those skilled in the art will understand that the electronic device structure shown in FIG6 does not constitute a limitation on the electronic device. The electronic device may include more or fewer components than shown in FIG6 , or a combination of certain components, or a different arrangement of components.

[0123] The processor 1001 is the control center of the electronic device. It uses various interfaces and lines to connect the various parts of the entire electronic device. By running or executing software programs and / or modules stored in the memory 1002 and calling data stored in the memory 1002, it performs various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. The processor 1001 may include one or more processing units. Optionally, the processor 1001 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly handles wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 1001.

[0124] Memory 1002 can be used to store software programs and various data. Memory 1002 may primarily include a program storage area and a data storage area. The program storage area may store an operating system and application programs required by at least one functional module (e.g., determination unit 901, processing unit 902, control unit 903). Furthermore, memory 1002 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0125] In an exemplary embodiment, a computer-readable storage medium including instructions is further provided, such as a memory 1002 including instructions. The above instructions can be executed by the processor 1001 of the electronic device 1000 to implement the low-voltage circuit control method in the above embodiment.

[0126] In actual implementation, the functions of the determining unit 901, the processing unit 902, and the control unit 903 in FIG5 can all be implemented by the processor 1001 in FIG6 calling a computer program stored in the memory 1002. The specific execution process can be referred to the description of the low-voltage circuit control method in the above embodiment, and will not be repeated here.

[0127] Optionally, the computer-readable storage medium may be a non-temporary computer-readable storage medium, for example, the non-temporary computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0128] In an exemplary embodiment, an embodiment of the present application further provides a low-voltage circuit control system, which includes a power replenishment module, a battery, and a controller for executing the method of the above-mentioned first aspect and any possible implementation method thereof, and the controller is connected in parallel with the power replenishment module and the battery, respectively.

[0129] In an exemplary embodiment, the present application also provides a computer program product including one or more instructions, which can be executed by a processor of an electronic device to implement the low-voltage circuit control method in the above embodiment.

[0130] It should be noted that when the instructions in the above-mentioned computer-readable storage medium or one or more instructions in the computer program product are executed by the processor of the electronic device, the various processes of the above-mentioned low-voltage circuit control method embodiment are implemented, and the same technical effect as the above-mentioned low-voltage circuit control method can be achieved. To avoid repetition, they will not be repeated here.

[0131] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0132] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0133] Units described as separate components may or may not be physically separate, and components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0134] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0135] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a device (which can be a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

[0136] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A low voltage circuit control method, characterized in that: A power management unit applied to a low-voltage circuit control system, the low-voltage circuit control system further comprising: a DC converter and a low-voltage circuit; the low-voltage circuit comprises a first low-voltage circuit and a second low-voltage circuit; the power management unit is used to control the on and off of the second low-voltage circuit; the DC converter is used to supply power to a load in the first low-voltage circuit, and to supply power to a load in the second low-voltage circuit when the power management unit is in a closed state; the second low-voltage circuit further comprises a battery; the battery is used to supply power to a load in the second low-voltage circuit when the power management unit is in a disconnected state, and to supply power to the loads in the first low-voltage circuit and the second low-voltage circuit when the power management unit is in a closed state and the DC converter is in a disconnected state; The method comprises: In the case where the current of the low-voltage circuit is greater than the preset current, judging whether the fault point of the low-voltage circuit control system is located in the second low-voltage circuit according to the voltage across the power management unit; When the fault point is not located in the second low-voltage circuit, the DC converter is controlled to be in a disconnected state, and the on-off state of the power management unit is determined according to the current of the low-voltage circuit after the DC converter is in the disconnected state; When the fault point is located in the second low-voltage circuit, the power management unit is controlled to be in a disconnected state.

2. The method according to claim 1, characterized in that The first end of the power management unit is connected to the DC converter and the first low-voltage circuit respectively, and the second end of the power management unit is connected to the second low-voltage circuit; when the current of the low-voltage circuit is greater than the preset current, judging whether the fault point of the low-voltage circuit control system is located in the second low-voltage circuit according to the voltage at both ends of the power management unit, including: When the current of the low-voltage circuit is greater than the preset current and the voltage of the first end of the power management unit is greater than the voltage of the second end of the power management unit, determining that the fault point is located in the second low-voltage circuit; When the current of the low-voltage circuit is greater than the preset current and the voltage of the first end of the power management unit is less than the voltage of the second end of the power management unit, it is determined that the fault point is not located in the second low-voltage circuit.

3. The method according to claim 1, characterized in that Determining the on / off state of the power management unit according to the current of the low-voltage circuit after the DC converter is in the off state includes: After the DC converter is in the disconnected state, if the current of the low voltage circuit is greater than the preset current, the control Controlling the power management unit to be in a disconnected state; After the DC converter is in the disconnected state, if the current of the low-voltage circuit is less than the preset current, the power management unit is controlled to be in the closed state.

4. The method according to any one of claims 1 to 3, characterized in that The method further comprises: When the voltage of the low-voltage circuit is greater than a preset voltage, the DC converter is controlled to be in a disconnected state, and the on-off state of the power management unit is determined according to the voltage of the low-voltage circuit after the DC converter is in the disconnected state.

5. The method according to claim 4, characterized in that Determining the on / off state of the power management unit according to the voltage of the low-voltage circuit after the DC converter is in the off state includes: After the DC converter is in the disconnected state, if the voltage of the low-voltage circuit is greater than the preset voltage, the power management unit is controlled to be in the disconnected state; After the DC converter is in the disconnected state, if the voltage of the low-voltage circuit is less than the preset voltage, the power management unit is controlled to be in the closed state.

6. A low voltage circuit control device, characterized in that: A power management unit applied to a low-voltage circuit control system, the low-voltage circuit control system further comprising: a DC converter and a low-voltage circuit; the low-voltage circuit comprises a first low-voltage circuit and a second low-voltage circuit; the power management unit is used to control the on and off of the second low-voltage circuit; the DC converter is used to supply power to a load in the first low-voltage circuit, and to supply power to a load in the second low-voltage circuit when the power management unit is in a closed state; the second low-voltage circuit further comprises a battery; the battery is used to supply power to a load in the second low-voltage circuit when the power management unit is in a disconnected state, and to supply power to the loads in the first low-voltage circuit and the second low-voltage circuit when the power management unit is in a closed state and the DC converter is in a disconnected state; The low voltage circuit control device comprises a determination unit, a processing unit and a control unit; The determination unit is used to determine whether the fault point of the low-voltage circuit control system is located in the second low-voltage circuit according to the voltage across the power management unit when the current of the low-voltage circuit is greater than a preset current; The processing unit is used to control the DC converter to be in a disconnected state when the fault point is not located in the second low-voltage circuit, and determine the on-off state of the power management unit according to the current of the low-voltage circuit after the DC converter is in the disconnected state; The control unit is used to control the power management unit to be in a disconnected state when the fault point is located in the second low-voltage circuit.

7. The device according to claim 6, characterized in that The first end of the power management unit is connected to the DC converter and the first low-voltage circuit respectively, and the second end of the power management unit is connected to the second low-voltage circuit; the determination unit is specifically used to: When the current of the low-voltage circuit is greater than the preset current and the voltage of the first end of the power management unit is greater than the voltage of the second end of the power management unit, determining that the fault point is located in the second low-voltage circuit; When the current of the low-voltage circuit is greater than the preset current and the voltage of the first end of the power management unit is less than the voltage of the second end of the power management unit, it is determined that the fault point is not located in the second low-voltage circuit.

8. The device according to claim 6, characterized in that The processing unit is specifically used for: After the DC converter is in the disconnected state, if the current of the low-voltage circuit is greater than the preset current, the power management unit is controlled to be in the disconnected state; After the DC converter is in the disconnected state, if the current of the low-voltage circuit is less than the preset current, the power management unit is controlled to be in the closed state.

9. The device according to any one of claims 6 to 8, characterized in that The processing unit is further used for: When the voltage of the low-voltage circuit is greater than a preset voltage, the DC converter is controlled to be in a disconnected state, and the on-off state of the power management unit is determined according to the voltage of the low-voltage circuit after the DC converter is in the disconnected state.

10. The device according to claim 9, characterized in that The processing unit is specifically used for: After the DC converter is in the disconnected state, if the voltage of the low-voltage circuit is greater than the preset voltage, the power management unit is controlled to be in the disconnected state; After the DC converter is in the disconnected state, if the voltage of the low-voltage circuit is less than the preset voltage, the power management unit is controlled to be in the closed state.

11. An electronic device, characterized in that: include: processor; a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the method as claimed in any one of claims 1 to 5.

12. A computer-readable storage medium, characterized in that: When the computer-executable instructions stored in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device is capable of performing the method as claimed in any one of claims 1 to 5.

13. A low voltage circuit control system, characterized in that: include: A DC converter, a low voltage circuit, and a power management unit for executing the method according to any one of claims 1 to 5; The low-voltage circuit includes a first low-voltage circuit and a second low-voltage circuit; the power management unit is used to control the on and off of the second low-voltage circuit; the DC converter is used to supply power to the load in the first low-voltage circuit, and to supply power to the load in the second low-voltage circuit when the power management unit is in a closed state; the second low-voltage circuit also includes a battery; the battery is used to supply power to the load in the second low-voltage circuit when the power management unit is in a disconnected state, and to supply power to the loads in the first low-voltage circuit and the second low-voltage circuit when the power management unit is in a closed state and the DC converter is in a disconnected state.

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