Power supply system and power supply method of vehicle-mounted power supply

Abstract

The invention relates to the technical field of new energy vehicles, and provides a power supply system and a power supply method of a vehicle-mounted power supply. The power supply system of the vehicle-mounted power supply comprises a battery pack; a single monitoring module; the MOS driving and holding module comprises a D trigger and is used for generating a driving signal according to a line or logic relation between the control signal and the holding signal; the power MOS matrix comprises a first power MOS matrix and a second power MOS matrix, the on-off of the first power MOS matrix is controlled by a first driving signal, and the on-off of the second power MOS matrix is controlled by a second driving signal; and the controller is used for acquiring the output voltage of the battery pack, the monitoring signal output by the single monitoring module, the driving signal output by the MOS driving and maintaining module and the branch current of the parallel branch where the power MOS matrix is located so as to judge whether the first battery pack and the battery pack break down or not, and generating a fault signal when a fault occurs.

Description

Technical Field

[0001] The present disclosure relates to the technical field of new energy vehicles, and particularly to a power supply system and a power supply method for an in-vehicle power supply. Background Art

[0002] With the rapid development of the electric vehicle industry, as a key auxiliary power supply, the 12V lithium battery plays a crucial role in the vehicle electrical system, and its safety issues have thus received much attention. Currently, there is generally a problem of insufficient redundancy in the design of existing 12V lithium battery systems, and it is often impossible to ensure the continuous and stable operation of the power supply system.

[0003] In terms of functional safety issues, the most concerned problem of the 12V lithium battery as a power supply system is how to avoid unexpected loss of low-voltage power supply. If the vehicle experiences an unexpected loss of low-voltage power supply during driving, it will pose a very large safety hazard. Summary of the Invention

[0004] In view of this, the embodiments of the present disclosure provide a power supply system and a power supply method for an in-vehicle power supply to solve the technical problem of unexpected loss of low-voltage power supply in vehicles in the prior art.

[0005] To achieve the above object, the technical solution adopted by the present disclosure is:

[0006] In the first aspect of the embodiments of the present disclosure, a power supply system for an in-vehicle power supply is provided, including: a battery pack, including a first battery pack and a second battery pack with the same output voltage, and the first battery pack and the second battery pack are connected in parallel to supply power externally; a single-cell monitoring module, including a first single-cell monitoring module for monitoring the battery working state of the single cells of the first battery pack and a second single-cell monitoring module for monitoring the battery working state of the single cells of the second battery pack, the battery working state including battery output voltage, battery output current, and battery temperature, and the single-cell monitoring module generates a monitoring signal representing the battery working state; a MOS drive holding module, including a D flip-flop, which is used to generate a drive signal according to the wired-OR logic relationship of a control signal and a holding signal, the holding signal is generated by the D flip-flop according to a trigger signal and a drive signal, and the drive signal includes a first drive signal and a second drive signal; a power MOS matrix, including a first power MOS matrix connected in series with the first battery pack and a second power MOS matrix connected in series with the second battery pack, the first power MOS matrix is controlled to be turned on and off by the first drive signal, and the second power MOS matrix is controlled to be turned on and off by the second drive signal; a controller, which is used to generate a control signal and a trigger signal, obtain the output voltage of the battery pack, the monitoring signal output by the single-cell monitoring module, the drive signal output by the MOS drive holding module, and the branch current of the parallel branch where the power MOS matrix is located, so as to judge whether the power supply system has a fault according to the output voltage, the monitoring signal, the drive signal, and the branch current, and generate a fault signal when a fault occurs.

[0007] In some embodiments, the power supply system further includes a host computer, which is communicatively connected to the controller and is configured to receive a fault signal and control a preselected electronic load to enter a low-power operation mode according to the fault signal.

[0008] In some embodiments, the power supply system further includes a main power supply and a backup power supply. The main power supply supplies power to the controller, and the main power supply and the backup power supply independently supply power to the D flip-flop. The controller is connected to the output terminal of the backup power supply and is configured to obtain the output voltage of the backup power supply of the backup power supply, and determine that the backup power supply has a fault and generate a fault signal when it detects that the output voltage of the backup power supply is less than a set second voltage threshold.

[0009] In some embodiments, the host computer further receives a keep-alive signal periodically generated and sent by the controller, and determines whether the controller and the main power supply have faults according to the keep-alive signal.

[0010] In some embodiments, the single-cell monitoring module transmits monitoring signals to the controller through the SPI bus.

[0011] In some embodiments, the host computer is communicatively connected to the controller through the CAN bus.

[0012] In a second aspect of the embodiments of the present disclosure, a power supply method for a vehicle-mounted power supply is provided. The power supply method is applied to the power supply system of the vehicle-mounted power supply in the first aspect of the embodiments of the present disclosure. The power supply method includes: generating a control signal and a trigger signal to control the MOS drive holding module to operate; obtaining the output voltages of the first battery pack and the second battery pack, and determining that the corresponding battery pack has a fault when the output voltage is less than a set first voltage threshold; reading the monitoring signals output by the single-cell monitoring module, and determining that the corresponding single-cell monitoring module has a fault when the reading fails or the fault register of the controller is valid; obtaining the drive signal output by the MOS drive holding module, and determining that the corresponding MOS drive holding module has a fault when the drive signal is inconsistent with the control signal; obtaining the branch current of the parallel branch where the power MOS matrix is located, and determining that the corresponding power MOS matrix has a fault when the output voltage and the drive signal are normal and the branch current is zero; and generating a fault signal when any of the above faults occurs in the power supply system.

[0013] In some embodiments, the power supply system further includes a host computer, and the method further includes: sending the fault signal to the host computer so that the host computer controls a preselected electronic load to enter a low-power operation mode according to the fault signal.

[0014] In some embodiments, the power supply system further includes a main power supply and a backup power supply. The main power supply powers the controller, and the main power supply and the backup power supply independently power the D flip-flop. The controller is connected to the output terminal of the backup power supply. The power supply method further includes: obtaining the output voltage of the backup power supply, and determining that the backup power supply fails when it is detected that the output voltage of the backup power supply is less than a set second voltage threshold, and generating a fault signal.

[0015] In some embodiments, the power supply system further includes a main power supply that powers the controller. The method further includes: periodically generating a keep-alive signal and sending it to the host computer so that the host computer determines whether the controller and the main power supply fail according to the keep-alive signal.

[0016] The beneficial effects of the embodiments of the present disclosure compared with the prior art are as follows: By setting up the drive holding module, it is ensured that the power MOS matrix conducts when the controller fails, and the controller monitors the fault conditions of other modules of the power supply system to ensure that the low-voltage power supply system maintains operation when a fault occurs, preventing unexpected loss of low-voltage power supply and reducing potential safety hazards during vehicle operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is a schematic structural diagram of a power supply system of a vehicle-mounted power supply provided by an embodiment of the present disclosure;

[0019] Figure 2 is a schematic structural diagram of a single-cell monitoring module of a vehicle-mounted power supply provided by an embodiment of the present disclosure;

[0020] Figure 3 is a schematic structural diagram of a power MOS matrix of a vehicle-mounted power supply provided by an embodiment of the present disclosure;

[0021] Figure 4 is a schematic structural diagram of a MOS drive holding module of a vehicle-mounted power supply provided by an embodiment of the present disclosure;

[0022] Figure 5 is a schematic flowchart of a power supply method of a vehicle-mounted power supply provided by an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The embodiments of the present disclosure will now be described more fully with reference to the accompanying drawings in which embodiments are shown. However, the embodiments of the present disclosure may be implemented in many different forms and should not be construed as limited to the embodiments specifically set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the embodiments to those skilled in the art, enabling those skilled in the art to implement the present invention. Like reference numerals in the drawings denote like elements, and thus their description will be omitted.

[0024] It should be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intervening elements therebetween. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements.

[0025] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of the present disclosure belong. It should also be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly rigid sense unless expressly so defined herein.

[0026] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. It should be understood that the terms "comprises," "comprising," and "having," etc., when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0027] In the related art, there is generally a problem of insufficient redundancy in the design of existing 12V lithium battery systems, which may lead to unexpected loss of low-voltage power supply during the operation of the 12V lithium battery system, thus causing a very large safety hazard.

[0028] To solve the above technical problems, the embodiments of the present disclosure provide a power supply solution for vehicle-mounted power supplies to achieve safe power supply for low-voltage power supply systems such as 12V lithium batteries.

[0029] Specifically, the technical solution of the embodiments of the present disclosure starts from the voltage holding mechanism of each module of the 12V lithium battery pack after a fault, and performs redundancy design, so that the redundant 12V lithium battery architecture can ensure that there is no power supply loss under various circuit fault conditions, thereby improving the overall safety of the battery pack.

[0030] The power supply system and method of an in-vehicle power supply according to embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0031] Figure 1 is a schematic structural diagram of a power supply system of an in-vehicle power supply provided by an embodiment of the present disclosure; Figure 2 is a schematic structural diagram of a single-cell monitoring module of an in-vehicle power supply provided by an embodiment of the present disclosure; Figure 3 is a schematic structural diagram of a power MOS matrix of an in-vehicle power supply provided by an embodiment of the present disclosure; Figure 4 is a schematic structural diagram of a MOS drive holding module of an in-vehicle power supply provided by an embodiment of the present disclosure; Figure 5 is a schematic flowchart of a power supply method of an in-vehicle power supply provided by an embodiment of the present disclosure. The following will be combined with Figures 1 to 5 to describe the power supply system and method of the in-vehicle power supply provided by the embodiments of the present disclosure.

[0032] As Figure 1 shown, an embodiment of the present disclosure provides a power supply system of an in-vehicle power supply, including a battery pack, a single-cell monitoring module, a MOS drive holding module, a power MOS matrix, and a controller.

[0033] In an embodiment of the present disclosure, the controller may be a microcontroller unit (MCU), and the MCU herein is the controller. MOS is an abbreviation for MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). The MOS drive IC (Integrated Circuit) is the drive integrated circuit of the MOS.

[0034] As Figure 1As shown, the battery pack includes a first battery pack and a second battery pack with the same output voltage. The first battery pack and the second battery pack are connected in parallel to supply power externally. The single-cell monitoring module includes a first single-cell monitoring module for monitoring the working state of the single cells in the first battery pack and a second single-cell monitoring module for monitoring the working state of the single cells in the second battery pack. The battery working state includes battery output voltage, battery output current, and battery temperature. The single-cell monitoring module generates a monitoring signal representing the battery working state. The MOS drive holding module includes a D flip-flop, which is used to generate a drive signal according to the wired-OR logic relationship of the control signal and the holding signal. The holding signal is generated by the D flip-flop according to the trigger signal and the drive signal. The drive signal includes a first drive signal and a second drive signal. The power MOS matrix includes a first power MOS matrix connected in series with the first battery pack and a second power MOS matrix connected in series with the second battery pack. The first power MOS matrix is controlled to turn on and off by the first drive signal, and the second power MOS matrix is controlled to turn on and off by the second drive signal. The controller is used to generate a control signal and a trigger signal, obtain the output voltage of the battery pack, the monitoring signal output by the single-cell monitoring module, the drive signal output by the MOS drive holding module, and the branch current of the parallel branch where the power MOS matrix is located, so as to judge whether the power supply system fails according to the output voltage, the monitoring signal, the drive signal, and the branch current, and generate a fault signal when a fault occurs.

[0035] The embodiment of the present disclosure discloses a redundant design architecture for low-voltage lithium batteries. In this redundant design architecture, a battery pack is divided into two independent battery packs, and the control circuit and control method are optimized accordingly to achieve redundant backup of the battery. Among them, the low-voltage lithium battery is the 12V power supply for the vehicle power supply. In addition, each functional module of the 12V lithium battery may fail. This redundant design architecture can also ensure that the vehicle does not lose low-voltage power supply well when a single-point failure occurs in the functional module of the low-voltage power supply system of the 12V lithium battery, greatly improving the safety of the system. At the same time, through the redundant optimization design of the power supply system, the cost increase is limited, so the application value is relatively high.

[0036] The technical solution of the embodiment of the present disclosure develops a redundant design solution for each functional module in response to the possible single-point failures of each functional module of the low-voltage power supply system of the vehicle power supply.

[0037] Specifically, for the battery pack of the power supply system, the technical solution of the embodiments of the present disclosure divides the original battery pack into two independent first battery packs and second battery packs. The two battery packs have the same voltage and a capacity of 1 / 2 of that before grouping, achieving dual-battery redundancy. In the case of no fault, the first battery pack and the second battery pack work simultaneously and can provide the same capacity as the battery pack before grouping. When one of the battery packs fails, the remaining battery pack supplies power normally, and the capacity is reduced to 1 / 2, which only results in a decrease in self-sustaining force but does not affect the vehicle functions and there is no safety risk. While achieving redundancy, the battery cost does not increase.

[0038] For the power MOS matrix, the technical solution of the embodiments of the present disclosure configures independent power MOS matrices for the two battery packs respectively. Since the MOS drive holding module that provides drive signals for the power MOS matrix is controlled by the same control source, the two groups of power MOS matrices can be turned on or off simultaneously. In the case of no fault, the two groups of power MOS matrices can share half of the load current, so the total number of required power MOS matrices is the same as that required before grouping. When one of the MOS matrices fails, the non-essential power supply parts in the vehicle ECU (Electronic Control Unit) can be put into the low-power mode through CAN (Controller Area Network) bus communication to reduce the load current in the case of a fault. In this way, the current capacity of a single group of power MOS matrices in the fault state only needs to be half of that before grouping. While achieving redundancy, the cost does not increase.

[0039] For the single-cell monitoring module, the technical solution of the embodiments of the present disclosure configures independent battery single-cell monitoring modules for the two battery packs respectively.

[0040] For the MOS drive part, the technical solution of the embodiments of the present disclosure provides a MOS drive holding module including a MOS drive holding circuit. The control signal and the holding signal of the MOS drive holding module form an OR relationship through a diode, that is, the control signal and the holding signal generate an output signal through an OR logic relationship. When any one of the control signal and the holding signal is at a high level, the output signal is at a high level. When normally driving the MOS to close, both the control signal and the holding signal are at a high level, and the input of the MOS drive IC is at a high level. If the controller fails at this time and the control signal fails and becomes low level, there is no trigger signal for the D flip-flop at this time, and the holding signal will remain at a high level unchanged. Then the input of the MOS drive IC remains at a high level unchanged, and the MOS in the power MOS matrix continues to remain closed.

[0041] For the power supply part of the controller and the MOS drive holding module, the technical solution of the embodiments of the present disclosure provides a main power supply and a backup power supply. Among them, the main power supply supplies power to the D flip-flops of the controller and the MOS drive holding module, and the backup power supply only supplies power to the D flip-flops of the MOS drive holding module. The backup power supply does not require complex functions and can be implemented by an LDO (Low-dropout regulator). Its function is to provide redundant power for the MOS drive holding circuit, ensure the normal function of the MOS drive holding circuit in the event of a main power supply failure, and ensure that there is no power supply loss when the main power supply fails.

[0042] It can be seen that in the embodiments of the present disclosure, when single-point failures occur in each functional module of the power supply system of the vehicle-mounted power supply, power supply loss can be ensured not to occur. The types of these single-point failures include battery pack open circuit failure, single cell monitoring module failure, power MOS matrix failure, MOS drive holding module failure, main power supply failure, backup power supply failure, and controller failure.

[0043] When the power supply system of the vehicle-mounted power supply is started, the MCU issues a control signal and a trigger signal to set the control signal and the hold signal of the MOS drive IC high at the same time, driving the power MOS matrix to close. Only when the MCU turns off the trigger signal, the D flip-flop is in the hold mode.

[0044] As Figure 1 shown, the MCU detects the battery resistance open circuit failure by monitoring the voltages of B+_1 and B+_2. When the voltage of B+_1 or B+_2 is lower than the detection threshold, it is determined that the corresponding battery resistance is open, the failure is reported, and a control message is sent through the communication module to control the non-essential load to enter the low power consumption mode, and the other battery pack continues to supply power externally.

[0045] As Figure 1 and Figure 2 shown, the MCU detects the single cell monitoring module failure through the read and write of the SPI (Serial Peripheral Interface) bus. When the corresponding SPI read and write fails, or when the internal failure register of the corresponding single cell monitoring module is read as valid, it is determined that the corresponding single cell monitoring module fails, the failure is reported, and a message is sent through the communication module to control the non-essential load to enter the low power consumption mode, and the other battery pack continues to supply power externally. As Figure 2As shown, the single-cell monitoring module is used to sample the single-cell voltage of the battery pack and perform balancing control, and at the same time perform current balancing and temperature sampling. Among them, before performing current balancing, it is necessary to pass through the filter Fliter for filtering. NTC is the abbreviation of NTC thermistor (Negative Temperature Coefficient thermistor), representing the temperature sensor. The single-cell monitoring module determines whether there is a fault in the battery pack based on the battery operating states such as the battery output voltage, battery output current, and battery temperature, and generates a monitoring signal when there is a fault. This monitoring signal can indicate whether the battery operating state is normal. Specifically, when the single-cell monitoring module detects a fault in the battery in the battery pack, the fault register inside the single-cell monitoring module is set to valid. The MCU can read this fault register through SPI to determine that there is a fault in the single-cell monitoring module.

[0046] As Figure 1 shown, the MCU detects the fault of the power MOS matrix by monitoring the three states of the shunt (shunt resistor) current, B+_1 voltage, B+_2 voltage, and the drive signal of the power MOS matrix. When the B+_1 voltage and B+_2 voltage are normal, the drive signal of the power MOS matrix is normal, the shunt current of one module is normal, and the shunt current of the other module is 0, it is determined that the corresponding MOS matrix has an open circuit fault. The MCU reports the fault and sends a message through the communication module to control the non-essential load to enter the low-power mode, and the other battery pack continues to supply power externally. Among them, the two shunt (shunt resistor) currents include the first branch current of the parallel branch where the first battery pack and the first power MOS matrix are located, and the second branch current of the parallel branch where the second battery pack and the second power MOS matrix are located. The B+_1 voltage is the output voltage of the first battery pack, and the B+_2 voltage is the output voltage of the second battery pack.

[0047] As Figure 3 shown, the drive signal is input to the control terminal of the MOS in the power MOS matrix to control the on and off of the MOS.

[0048] The MCU detects the fault of the MOS control IC of the MOS control holding module by monitoring the drive signal of the power MOS matrix. When the control signal sent by the MCU is inconsistent with the drive signal of the power MOS matrix, it is determined that the corresponding power drive IC has a fault, reports the fault, and sends a message through the communication module to control the non-essential load to enter the low-power mode, and the other battery pack continues to supply power externally.

[0049] The power supply system includes a main power supply that powers the controller. In some embodiments, the host computer also receives the keep-alive signal periodically generated and sent by the controller, and determines whether the controller and the main power supply are faulty based on the keep-alive signal.

[0050] Specifically, when the main power supply fails, the controller loses power, but the D flip-flop in the MOS drive holding circuit continues to operate under the power supply of the backup power supply, maintaining the control signal of the MOS drive IC, ensuring the external power supply of the 12V lithium battery power supply system. At this time, the CAN communication between the external ECU and the 12V lithium battery power supply system will be lost, and the vehicle can obtain the fault information of the 12V lithium battery power supply system.

[0051] As Figure 4 shown, the control signal and the hold signal input to the MOS drive IC generate an output signal through a wired-OR logic relationship. Among them, the hold signal is generated by the D flip-flop according to the control signal and the trigger signal output by the controller. When the MCU fails, the control signal becomes low level. Due to the presence of the D flip-flop, when the input control signal of the MOS drive IC remains low, the hold signal is not affected and remains at a high level, so that the drive signal output by the MOS drive holding circuit is not affected, and both battery packs can continue to supply power externally. At this time, the CAN communication between the external ECU and the 12V lithium battery power supply system will be lost, and the vehicle can obtain the fault information of the 12V lithium battery power supply system. The vehicle can determine the fault condition of the 12V lithium battery power supply system according to the fault and process it in time.

[0052] As Figure 1 and Figure 4 shown, the power supply system also includes a backup power supply. The main power supply powers the controller, and the main power supply and the backup power supply independently power the D flip-flop. The controller is connected to the output terminal of the backup power supply to obtain the backup power supply output voltage of the backup power supply, and determines that the backup power supply is faulty when it detects that the backup power supply output voltage is less than the set second voltage threshold, and generates a fault signal when a fault occurs. Since the backup power supply fault only affects the operation of the D flip-flop and does not affect the operation of other circuits. Specifically, the MCU monitors the backup power supply fault status by monitoring the backup power supply output voltage, and determines that the backup power supply is faulty when the detected voltage is lower than the threshold, and reports the fault. Therefore, when the backup power supply fails, the main power supply powers the D flip-flop, and the hold signal is not affected and remains at a high level, so that the drive signal output by the MOS drive holding circuit is not affected, and both battery packs can continue to supply power externally.

[0053] In the embodiments of the present disclosure, the power supply system further includes a host computer. As Figure 1 shown, the communication module is a CAN communication module, and the host computer is communicatively connected to the controller through the CAN bus. As Figure 2As shown, the monomer monitoring module transmits monitoring signals to the MCU through the SPI bus.

[0054] The host computer and the controller can transmit data through the CAN bus. After the controller generates a fault signal, the host computer can receive the fault signal and control some non-essential power-supplied electronic loads to enter the low-power mode according to the fault signal, reducing the load current in case of a fault. The non-essential power-supplied electronic loads are pre-selected according to the actual operation needs.

[0055] According to the power supply system of the vehicle power supply provided by the embodiments of the present disclosure, by setting the drive holding module to ensure that the power MOS matrix conducts when the controller fails, and monitoring the fault conditions of other modules of the power supply system by the controller, to ensure that the low-voltage power supply system maintains operation when a fault occurs, preventing the occurrence of unexpected low-voltage power supply loss and reducing the safety hazards of vehicle operation.

[0056] The embodiments of the present disclosure provide a power supply method for a vehicle power supply. This power supply method is applied to the power supply system of the vehicle power supply in the above technical solution, as Figure 5 shown, this power supply method includes:

[0057] Step S501, generating a control signal and a trigger signal to control the operation of the MOS drive holding module.

[0058] Step S502, obtaining the output voltages of the first battery pack and the second battery pack, and determining that the corresponding battery pack has a fault when the output voltage is less than the set first voltage threshold.

[0059] Step S503, reading the monitoring signal output by the monomer monitoring module, and determining that the corresponding monomer monitoring module has a fault when the reading fails or the fault register is valid. Here, the fault register is a register inside the controller for storing fault signals, and the validity of the fault register represents that the monomer monitoring module has a fault.

[0060] Step S504, obtaining the drive signal output by the MOS drive holding module, and determining that the corresponding MOS drive holding module has a fault when the drive signal is inconsistent with the control signal.

[0061] Step S505, obtaining the branch current of the parallel branch where the power MOS matrix is located, and determining that the corresponding power MOS matrix has a fault when the output voltage and the drive signal are normal and the branch current is zero.

[0062] Step S506, generating a fault signal when any of the above faults occurs in the power supply system.

[0063] In an embodiment of the present disclosure, the power supply system further includes a host computer. After step S506, a fault signal can be sent to the host computer so that the host computer controls a pre-selected electronic load to enter a low-power operation mode according to the fault signal.

[0064] In some embodiments, the power supply system further includes a main power supply and a backup power supply. The main power supply supplies power to the controller. The main power supply and the backup power supply independently supply power to the D flip-flop. The controller is connected to the output terminal of the backup power supply. Therefore, the power supply method provided by the embodiment of the present disclosure further includes: obtaining the output voltage of the backup power supply of the backup power supply, and determining that the backup power supply fails when it is detected that the output voltage of the backup power supply is less than a set second voltage threshold, and generating a fault signal when a fault occurs.

[0065] In some embodiments, the power supply system further includes a main power supply, and the main power supply supplies power to the controller. Therefore, the power supply method provided by the embodiment of the present disclosure further includes: periodically generating a keep-alive signal and sending it to the host computer so that the host computer determines whether the controller and the main power supply fail according to the keep-alive signal.

[0066] According to the power supply method of the vehicle-mounted power supply provided by the embodiment of the present disclosure, by setting a drive hold module to ensure that the power MOS matrix conducts when the controller fails, and the controller monitors the fault conditions of other modules of the power supply system, so as to ensure that the low-voltage power supply system maintains operation when a fault occurs, prevent the occurrence of unexpected low-voltage power supply loss, and reduce the safety hazards of vehicle operation.

[0067] The embodiment of the present application further provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the above method are implemented. The embodiment of the present application further provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by the processor, the steps of the above method are implemented.

[0068] The above are only the preferred embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A power supply system for a vehicle-mounted power supply, characterized in that: The power supply system of the vehicle-mounted power supply includes: A battery pack, comprising a first battery pack and a second battery pack having the same output voltage, wherein the first battery pack and the second battery pack are connected in parallel to supply power externally; A single-cell monitoring module, comprising a first single-cell monitoring module for monitoring the battery working state of the single-cell battery of the first battery group, and a second single-cell monitoring module for monitoring the battery working state of the single-cell battery of the second battery group, wherein the battery working state includes the battery output voltage, the battery output current and the battery temperature, and the single-cell monitoring module generates a monitoring signal representing the battery working state; A metal-oxide semiconductor field effect transistor (MOS) drive and hold module, comprising a D flip-flop, for generating a drive signal according to a line OR logic relationship between a control signal and a hold signal, wherein the hold signal is generated by the D flip-flop according to a trigger signal and the drive signal, and the drive signal comprises a first drive signal and a second drive signal; A power MOS matrix, comprising a first power MOS matrix connected in series with the first battery group and a second power MOS matrix connected in series with the second battery group, wherein the first power MOS matrix is ​​controlled on and off by the first drive signal, and the second power MOS matrix is ​​controlled on and off by the second drive signal; A controller is used to generate the control signal and the trigger signal, obtain the output voltage of the battery pack, the monitoring signal output by the single-cell monitoring module, the drive signal output by the MOS drive and hold module, and the branch current of the parallel branch where the power MOS matrix is ​​located, so as to determine whether the power supply system fails based on the output voltage, the monitoring signal, the drive signal and the branch current, and generate a fault signal when a fault occurs.

2. The vehicle-mounted power supply system according to claim 1, characterized in that: The power supply system also includes a host computer, which is communicatively connected to the controller and is used to receive the fault signal and control a pre-selected electronic load to enter a low power consumption operation mode according to the fault signal.

3. The vehicle-mounted power supply system according to claim 2, characterized in that: The power supply system also includes a main power supply and a backup power supply, the main power supply supplies power to the controller, and the main power supply and the backup power supply each independently supplies power to the D flip-flop, the controller is connected to the output end of the backup power supply, and is used to obtain the backup power supply output voltage of the backup power supply, and when it is detected that the backup power supply output voltage is less than a set second voltage threshold, it is determined that the backup power supply has failed, and a fault signal is generated.

4. The vehicle-mounted power supply system according to claim 3, characterized in that: The host computer also receives a keep-alive signal periodically generated and sent by the controller, and determines whether the controller and the main power supply fail according to the keep-alive signal.

5. The vehicle-mounted power supply system according to claim 1, characterized in that: The single-unit monitoring module transmits the monitoring signal to the controller via a serial peripheral interface SPI bus.

6. The vehicle-mounted power supply system according to claim 2, characterized in that: The host computer is connected to the controller via a controller area network (CAN) bus.

7. A power supply method for a vehicle-mounted power supply, characterized in that: The power supply method is applied to the power supply system of the vehicle power supply according to any one of claims 1 to 6 above, and the power supply method comprises: Generate control signals and trigger signals to control the MOS drive to keep the module working; Obtaining output voltages of the first battery pack and the second battery pack, and determining that a corresponding battery pack fails when the output voltages are less than a set first voltage threshold; Read the monitoring signal output by the single monitoring module, and determine that the corresponding single monitoring module is faulty when the reading fails or the fault register of the controller is valid; Acquire a driving signal output by the MOS driving and holding module, and determine a corresponding MOS driving and holding module failure when the driving signal is inconsistent with the control signal; Obtaining a branch current of a parallel branch where a power MOS matrix is ​​located, and determining a corresponding power MOS matrix fault when the output voltage and the drive signal are normal and the branch current is zero; When any of the above faults occurs in the power supply system, a fault signal is generated.

8. The power supply method of the vehicle-mounted power supply according to claim 7, characterized in that: The power supply system further includes a host computer, and the method further includes: sending the fault signal to the host computer, so that the host computer controls a pre-selected electronic load to enter a low power consumption operation mode according to the fault signal.

9. The power supply method of the vehicle-mounted power supply according to claim 7, characterized in that: The power supply system also includes a main power supply and a backup power supply, the main power supply supplies power to the controller, the main power supply and the backup power supply each independently supplies power to the D flip-flop, the controller is connected to the output end of the backup power supply, and the power supply method also includes: obtaining a backup power supply output voltage of the backup power supply, and determining that the backup power supply has a fault when it is detected that the backup power supply output voltage is less than a set second voltage threshold, and generating a fault signal.

10. The power supply method of the vehicle-mounted power supply according to claim 8, characterized in that: The power supply system also includes a main power supply, which supplies power to the controller. The method also includes: periodically generating a keep-alive signal and sending it to the host computer, so that the host computer determines whether the controller and the main power supply are faulty based on the keep-alive signal.

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