Low-voltage power distribution system and method, and vehicle

Abstract

The present application provides a low-voltage power distribution system and method, and a vehicle. The system comprises: a first direct current-direct current converter, a power supply, and a power distribution unit. The power distribution unit comprises a first power supply channel and a second power supply channel; a first end of the first power supply channel is connected to the first direct current-direct current converter, and a second end of the first power supply channel is connected to a first end of the second power supply channel; a second end of the second power supply channel is connected to the power supply; and power supply ends of the first power supply channel and power supply ends of the second power supply channel are used for being connected to low-voltage loads. The system in the present application improves the scalability of the low-voltage power distribution system.

Description

Low voltage power distribution system, method and vehicle

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 5, 2024, with application number 202410165829.0 and application name “Low Voltage Distribution System, Method and Vehicle”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the automotive field, and in particular to a low-voltage power distribution system, method, and vehicle. Background Art

[0003] The low-voltage electrical system of an electric vehicle consists of an insulation system, a power distribution system, and a control system. The power distribution system is used to convert the direct current (DC) output from the high-voltage battery into AC suitable for low-voltage equipment, thereby supplying power to various low-voltage electrical devices.

[0004] Different levels of autonomous driving vehicles have different power distribution systems and Automotive Safety Integrity Levels (ASILs). For example, the power distribution system of a Level 2 autonomous driving vehicle includes one ASIL B low-voltage power grid, and the low-voltage power supply system of a Level 4 autonomous driving vehicle includes two ASIL B low-voltage power grids. The two low-voltage power grids work together to ensure that the vehicle's power distribution function safety reaches ASIL D.

[0005] When the above-mentioned L2-level power distribution system is expanded to an L4-level power distribution system, a redundant low-voltage power grid needs to be added, which makes the vehicle layout difficult and has poor scalability. Summary of the Invention

[0006] The present application provides a low-voltage power distribution system, method and vehicle to solve the problem of poor scalability of existing low-voltage power distribution systems.

[0007] In a first aspect, the present application provides a low-voltage power distribution system, comprising: a first DC voltage converter, a power supply, and a distribution box; the distribution box comprises a first power channel and a second power channel;

[0008] A first end of the first power channel is connected to the first DC voltage converter, a second end of the first power channel is connected to the first end of the second power channel; and a second end of the second power channel is connected to the power supply;

[0009] The power supply end of the first power supply channel and the power supply end of the second power supply channel are used to connect to a low-voltage load.

[0010] In some embodiments, the system further comprises: a second DC voltage converter, and the distribution box further comprises an isolating switch;

[0011] The second DC voltage converter is connected to the third end of the second power supply channel;

[0012] The second end of the first power supply channel is connected to the first end of the second power supply channel through an isolation switch.

[0013] In some embodiments, the functional safety integrity level of the first DC voltage converter and the second DC voltage converter are both Class B, and the functional safety integrity level of the isolation switch is Class D.

[0014] In some embodiments, the power supply end of the first power channel is used to connect to the autonomous driving controller.

[0015] In some embodiments, the power supply end of the second power supply channel is used to connect to the autonomous driving controller.

[0016] In some embodiments, the power supply end of the first power supply channel is used to connect to the first end of the autonomous driving controller, and the power supply end of the second power supply channel is used to connect to the second end of the autonomous driving controller.

[0017] In some embodiments, the power supply end of the first power supply channel is connected to the low-voltage load through a load switch, and the power supply end of the second power supply channel is connected to the low-voltage load through a load switch.

[0018] In a second aspect, the present application provides a low-voltage power distribution method, which is applied to a low-voltage power distribution system, wherein the low-voltage power distribution system includes a first DC voltage converter, a power supply, and a distribution box; the distribution box includes a first power channel and a second power channel;

[0019] A first end of the first power channel is connected to the first DC voltage converter, a second end of the first power channel is connected to the first end of the second power channel; and a second end of the second power channel is connected to the power supply;

[0020] The power supply end of the first power supply channel and the power supply end of the second power supply channel are used to connect to a low-voltage load;

[0021] The system further comprises: a second DC voltage converter, and the distribution box further comprises an isolating switch;

[0022] The second DC voltage converter is connected to the third end of the second power supply channel;

[0023] The second end of the first power supply channel is connected to the first end of the second power supply channel via an isolation switch;

[0024] Methods include:

[0025] When the low-voltage power distribution system operates normally, the isolating switch is closed, and the first power supply channel is connected to the second power supply channel.

[0026] In some embodiments, the method further comprises:

[0027] When the low-voltage power distribution system fails, the isolating switch is disconnected, and the first power supply channel and the second power supply channel are powered independently.

[0028] In a third aspect, the present application provides a vehicle comprising the low-voltage power distribution system in the first aspect and any one of the embodiments of the first aspect.

[0029] The low-voltage power distribution system, method, and vehicle provided in the present application, by providing a first DC voltage converter, a power supply, and a distribution box in the low-voltage power distribution system, and providing a first power channel and a second power channel in the distribution box, make the low-voltage power distribution system easily expandable to a structure suitable for other ASILs, and enable compatibility between low-voltage power distribution systems of different ASILs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] FIG1 is a schematic structural diagram of an L2 low-voltage power distribution system in the prior art;

[0032] FIG2 is a schematic structural diagram of an L4 low-voltage power distribution system in the prior art;

[0033] FIG3 is a schematic structural diagram of a low-voltage power distribution system provided in one embodiment of the present application;

[0034] FIG4 is a schematic structural diagram of another low-voltage power distribution system provided in an embodiment of the present application.

[0035] Reference numerals: DCDC 1—first DC voltage converter; DCDC 2—second DC voltage converter; PC 1—first power supply channel; PC 2—second power supply channel. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0037] 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 particular order or precedence. It should be understood that such terms are interchangeable where appropriate. For example, first information may be referred to as second information, and similarly, second information may be referred to as first information without departing from the scope of this disclosure.

[0038] In the manual driving world, electric power steering systems typically employ a non-redundant design, consisting of a single electronic control unit (ECU) and a single motor, powered by a single power supply. If any node in the electric power steering system fails, the system can be shut down, and steering force is completely provided manually. However, with the advancement of autonomous driving technology, particularly the adoption of advanced driving assistance systems (ADAS), non-redundant electric power steering systems are no longer able to meet the safety requirements of automotive driving.

[0039] Currently, autonomous driving is divided into 6 levels, which are as follows from low to high:

[0040] L0: No automation configuration, the driver is completely driving the vehicle, and there is no active safety configuration.

[0041] L1: Driving assistance. The vehicle has certain functions to assist the driver in performing specific tasks of lateral or longitudinal vehicle movement (but it cannot complete complex tasks such as merging and overtaking at the same time). The driver bears most of the vehicle control capabilities.

[0042] L2: Advanced Driver Assistance, also known as partial automation, allows the vehicle to assist the driver with certain lateral and longitudinal motion tasks (the vehicle can autonomously perform specific complex tasks), but the driver must monitor the vehicle in real time as these tasks are completed. Using a single power supply can meet the power supply requirements of the entire vehicle up to ASIL B.

[0043] Level 3: Autonomous driving in specific scenarios. With the driver's consent, the autonomous driving system can fully intervene in the vehicle's driving. Of course, the driver can correct errors that occur during autonomous driving at any time.

[0044] L4: Advanced automated driving, also known as highly automated driving, means that all vehicle operations are performed by the automated driving system. The vehicle behaves illogically within the specified scenarios, and in emergencies, the system can make decisions automatically, without requiring any driver intervention. Using two power supplies can meet the vehicle's ASIL D power requirements. If a failure in the vehicle's main power supply disables vehicle safety and automated driving loads, a backup power supply is required to ensure reliable power supply for these loads, resulting in a downgrade in ASIL rating.

[0045] L5: Regardless of whether it is in a specific execution scenario, the vehicle can reach the destination through automatic driving without the owner's operation.

[0046] Among them, L2, L3 and L4 levels belong to the category of high-level driving assistance systems ADAS.

[0047] As can be seen, starting at Level 3, all driving operations are performed by the automated driving system, which requires a high level of safety. In the event of a partial failure of the automated driving system, Level 3 requires the automated driving system to remain operational until the driver intervenes or the vehicle reaches a safe area. Level 4 requires the automated driving system to remain operational until the vehicle reaches a safe area. Meeting these requirements requires redundancy in the automated driving system's actuators, such as the electric power steering system, to ensure that even in the event of a single point of failure, the system can maintain a certain level of steering assistance, allowing the vehicle to continue driving to a safe area. Analysis of different road conditions shows that to meet Level 3 requirements, the EPS system must have a redundancy of 50%, meaning it must be able to maintain 50% of steering assistance in the event of a single point of failure. To meet Level 4 requirements, the EPS system must have a redundancy of 75%, meaning it must be able to maintain 75% of steering assistance in the event of a single point of failure.

[0048] With the further evolution and sublimation of intelligent driving and intelligent electronic and electrical architecture, traditional power distribution solutions can no longer meet the needs of the system, especially the needs of future autonomous driving.

[0049] As shown in Figure 1, the autonomous driving L2 low-voltage power distribution system includes a low-voltage grid, which includes a direct current-direct current converter (DCDC), a power supply, and a power distribution unit (PDU). The DCDC functional safety is ASIL B, and is used to convert high-voltage power into low-voltage power as the input of the low-voltage power supply, so that the low-voltage distribution system meets ASIL B. The PDU is used to distribute the vehicle power input to various loads. The power supply is used to supply power to the load when the DCDC is not working, and to stabilize the voltage when the DCDC is working. It is an indispensable part of the low-voltage distribution system and can be configured as a 12V battery. The two power supplies of the automated driving domain controller (ADCU) are connected to this low-voltage grid to meet ASIL B power distribution requirements.

[0050] As shown in Figure 2, the L4 low-voltage power distribution system for autonomous driving consists of two low-voltage grids. Each grid includes a DC-DC converter, a power supply, and a power distribution unit (PDU). This means the L4 low-voltage power distribution system includes two DC-DC converters, two power supplies, and two PDUs. Both DC-DC converters 1 and 2 have ASIL B functional safety ratings. They convert high-voltage power to low-voltage power and serve as inputs to the low-voltage power supplies. Each DC-DC converter 1 and 2 independently achieve ASIL B compliance for one low-voltage grid. Connecting the two grids in parallel allows the entire low-voltage distribution system to achieve ASIL D compliance. The two ADCU power supplies are connected to the two grids, meeting ASIL D power distribution requirements. If one grid fails, the other grid can provide backup power, reducing the ADCU's power distribution requirements to ASIL B.

[0051] In summary, the L2 low-voltage power distribution system for autonomous driving includes one low-voltage grid. The L4 low-voltage power distribution system for autonomous driving adds another low-voltage grid to the L2 low-voltage distribution system, requiring two DC-DC converters, two power supplies, and two power distribution units (PDUs). The two DC-DC converters are connected to two low-voltage grids, each with different output voltages, different loads connected to the two low-voltage grids, and different voltage drops, making the vehicle's power supply logic complex. In other words, when the L2 low-voltage power distribution system is expanded to the L4 low-voltage distribution system, the number of component variables increases, the overall vehicle layout becomes more difficult, the cost and weight of the vehicle increase, and the expansion is difficult.

[0052] In response to the above problems, the present application proposes a low-voltage power distribution system, method and vehicle. By setting a first DC voltage converter, a power supply and a distribution box PDU in the low-voltage power distribution system, and setting a first power channel and a second power channel in the distribution box PDU, the low-voltage power distribution system can be easily expanded to a structure suitable for other ASILs, so that low-voltage power distribution systems of different ASILs can be compatible.

[0053] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0054] Figure 3 shows a schematic diagram of the structure of a low-voltage power distribution system provided in one embodiment of the present application. As shown in Figure 3, the low-voltage power distribution system of this embodiment may include a first DC voltage converter DCDC 1, a power supply, and a power distribution unit PDU; the power distribution unit PDU includes a first power channel PC 1 and a second power channel PC 2.

[0055] A first end of the first power channel PC1 is connected to the first DC voltage converter DCDC1, a second end of the first power channel PC1 is connected to a first end of the second power channel PC2; and a second end of the second power channel PC2 is connected to the power supply.

[0056] The power supply end of the first power channel PC 1 and the power supply end of the second power channel PC 2 are used to connect to a low-voltage load.

[0057] Optionally, the first power channel PC 1 is connected to the first DC voltage converter DCDC 1 through a metal-oxide-semiconductor field-effect transistor (MOS), and the first power channel PC 1 can be connected to the second power channel PC 2 through a copper bus; the second power channel PC 2 is connected to the power supply through the MOS, thereby forming a combined power grid.

[0058] When the first DC voltage converter DCDC 1 operates normally, it can supply power to various loads connected to the first power channel PC 1 and the second power channel PC 2 . At this time, the power supply plays a role in controlling the voltage stability of the low-voltage power distribution system.

[0059] When the first DC voltage converter DCDC 1 is not working, the power supply is used to supply power to the loads connected to the first power channel PC 1 and the second power channel PC 2 .

[0060] The autonomous driving domain controller ADCU can be connected to the first power channel PC 1 and the second power channel PC 2 through MOS, and is powered by one channel each of the first power channel PC 1 and the second power channel PC 2.

[0061] Figure 4 shows a schematic diagram of the structure of a low-voltage power distribution system provided by an embodiment of the present application. Based on the embodiment shown in Figure 3, as shown in Figure 4, the low-voltage power distribution system of this embodiment may further include: a second DC voltage converter DCDC 2, and the power distribution unit PDU also includes an isolating switch.

[0062] The second DC voltage converter DCDC 2 is connected to the third end of the second power channel PC 2 ; the second end of the first power channel PC 1 is connected to the first end of the second power channel PC 2 via an isolation switch.

[0063] Specifically, the second DC voltage converter DCDC 2 is connected to the second power channel PC 2 through a MOS, and the first power channel PC 1 is connected to the second power channel PC 2 through an isolation switch.

[0064] When both the first and second DC voltage converters (DCDC 1 and DCDC 2) are operating normally, the isolation switch is closed, and the first and second power channels (PC 1 and PC 2) form a combined power grid, powered by the stable voltage of the low-voltage distribution system. The autonomous driving domain controller (ADCU) is connected to the first and second power channels (PC 1 and PC 2) via MOS transistors, receiving power from each of these channels.

[0065] If either the first DC voltage converter DCDC 1 or the second DC voltage converter DCDC 2 fails, the isolation switch is opened, isolating the first power channel PC 1 and the second power channel PC 2. The two power channels are then tested for faults. After the fault point is determined, the connection between that power channel and the corresponding DC voltage converter is disconnected, cutting off its power input. The isolation switch is then closed, allowing the other power channel to supply power to the ADCU, degrading the ADCU's operation.

[0066] In the embodiment of the present application, the low-voltage power distribution system shown in Figure 3 and the low-voltage power distribution system shown in Figure 4 can achieve different power supply requirements by adding or deleting a DC voltage converter DCDC and an isolating switch. The power supply logic is simple and the vehicle configuration is easier. The low-voltage power distribution system shown in Figure 3 achieves the effect of easy expansion.

[0067] Based on the above embodiment, the functional safety integrity level of the first DC voltage converter DCDC 1 and the second DC voltage converter DCDC 2 are both Class B, and the functional safety integrity level of the disconnector is Class D.

[0068] Among them, when the first DC voltage converter DCDC 1 of the low-voltage power distribution system shown in Figure 3 is ASIL B, it can be used in L2 autonomous driving vehicles.

[0069] The first power channel PC 1 connects to the first DC voltage converter DCDC 1 (ASIL B). Inside the power distribution unit (PDU), the first power channel PC 1 is connected to the second power channel PC 2 via a copper busbar, forming a single power grid. ASIL B's first DC voltage converter DCDC 1 serves as the input for the low-voltage power supply, ensuring that the entire low-voltage power distribution system meets ASIL B standards.

[0070] Optionally, the power supply end of the first power supply channel PC 1 is used to connect to the autonomous driving controller ADCU. That is, both ends of the autonomous driving controller ADCU can be connected to the first power supply channel PC 1.

[0071] Optionally, the power supply end of the second power supply channel PC 2 is used to connect to the autonomous driving controller ADCU. That is, both ends of the autonomous driving controller ADCU can be connected to the second power supply channel PC 2.

[0072] Alternatively, in the low-voltage power distribution system shown in Figure 3, the power supply end of the first power channel PC 1 is connected to the first end of the autonomous driving controller, and the power supply end of the second power channel PC 2 is connected to the second end of the autonomous driving controller. That is, the two ends of the autonomous driving controller ADCU can be connected to the first power channel PC 1 and the second power channel PC 2, respectively.

[0073] The low-voltage power distribution system shown in FIG4 can be used in L4 autonomous driving vehicles when the first DC voltage converter DCDC 1 and the second DC voltage converter DCDC 2 are both ASIL B and the disconnector is ASIL D.

[0074] The first power channel PC 1 is connected to the first DC voltage converter DCDC 1 of ASIL B, and the second power channel PC 2 is connected to the second DC voltage converter DCDC 2 of ASIL B. The first power channel PC 1 is connected to the second power channel PC 2 through an ASIL D isolation switch inside the power distribution unit (PDU).

[0075] When the low-voltage power distribution system is operating normally, the ASIL D isolation switch is closed, and the two ASIL B DC voltage converters (DCDC) combine to form a power grid to supply power to the loads connected to the first power channel PC 1 and the second power channel PC 2, ensuring that the entire low-voltage power distribution system meets ASIL D. The autonomous driving domain controller (ADCU) is powered by one power channel each from the first power channel PC 1 and the second power channel PC 2.

[0076] In the event of a low-voltage power distribution system failure, the ASIL D isolation switch is opened to isolate the first power channel PC 1 and the second power channel PC 2, facilitating fault location detection. Once the fault location is located, the connection between that power channel and the corresponding DC voltage converter is disconnected, cutting off its power input. The isolation switch is then closed, allowing the other power channel to power the ADCU, downgrading the ADCU from L4 to L2, thus enabling automated driving assistance.

[0077] Optionally, in the low-voltage power distribution system shown in Figure 4, the power supply end of the first power channel PC 1 is connected to the first end of the autonomous driving controller, and the power supply end of the second power channel PC 2 is connected to the second end of the autonomous driving controller. That is, the two ends of the autonomous driving controller ADCU are connected to the first power channel PC 1 and the second power channel PC 2, respectively.

[0078] The low-voltage power distribution system of this application adds an ASIL B DC voltage converter (DCDC) to the L2 low-voltage power distribution system, while simply modifying the structure of the power distribution unit (PDU). This makes the L2 low-voltage power distribution system more scalable. Compared with the existing L4 low-voltage power distribution system, the L4 low-voltage power distribution system eliminates at least one power supply and one power distribution unit (PDU), making vehicle layout easier and reducing vehicle cost and weight.

[0079] Based on the above embodiment, the power supply end of the first power channel PC1 can be connected to the low voltage load through a load switch, and the power supply end of the second power channel PC2 can be connected to the low voltage load through a load switch.

[0080] Optionally, the load switch may be a MOS transistor or other switching elements.

[0081] The low-voltage power distribution system in the embodiment of the present application can be used in autonomous driving vehicles, and can also be used in other redundant power supply structures, such as drones, robots, etc.

[0082] The present application also provides a low-voltage power distribution method, which is applied to a low-voltage power distribution system.

[0083] The low-voltage power distribution system includes a first DC voltage converter DCDC 1, a second DC voltage converter DCDC 2, a power supply, and a power distribution unit (PDU). The PDU includes a first power channel PC 1, a second power channel PC 2, and an isolation switch.

[0084] A first end of the first power channel PC 1 is connected to the first DC voltage converter DCDC 1, and a second end of the first power channel PC 1 is connected to a first end of the second power channel PC 2. A second end of the second power channel PC 2 is connected to a power supply. The power supply end of the first power channel PC 1 and the power supply end of the second power channel PC 2 are used to connect to a low-voltage load.

[0085] The second DC voltage converter DCDC 2 is connected to the third end of the second power channel PC 2;

[0086] The second end of the first power channel PC 1 is connected to the first end of the second power channel PC 2 via an isolation switch.

[0087] Optionally, the functional safety integrity level of the first DC voltage converter DCDC 1 and the second DC voltage converter DCDC 2 are both Class B, and the functional safety integrity level of the disconnector is Class D.

[0088] Optionally, the first power channel PC 1 is connected to the first DC voltage converter DCDC 1 through a MOS, and the second DC voltage converter DCDC 2 is connected to the second power channel PC 2 through a MOS. The autonomous driving domain controller ADCU can be connected to the first power channel PC 1 and the second power channel PC 2 through a MOS, and can be powered by one channel each of the first power channel PC 1 and the second power channel PC 2.

[0089] In this embodiment of the low-voltage power distribution method, when the low-voltage power distribution system is operating normally, the isolating switch is closed, connecting the first power channel PC1 and the second power channel PC2, forming a combined power grid, with the power supply being the stable voltage of the low-voltage power distribution system. The autonomous driving domain controller (ADCU) can be connected to the first power channel PC1 and the second power channel PC2 via MOS, receiving power from each of the first and second power channels PC1 and PC2.

[0090] When the low-voltage power distribution system fails, the isolation switch is disconnected, and the first power supply channel PC 1 and the second power supply channel PC 2 are powered independently.

[0091] The low-voltage power distribution method of this embodiment realizes the power supply requirements of the autonomous driving domain controller ADCU by controlling the opening or closing of the isolation switch in the distribution box PDU. The power supply logic is simple. When applied to autonomous driving L2 and autonomous driving L4, it can solve the problem of incompatibility of the power distribution schemes of the L2 and L4 low-voltage power distribution systems.

[0092] The present application also provides a vehicle, which includes the low-voltage power distribution system in the aforementioned embodiment.

[0093] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the aforementioned embodiments, those skilled in the art will appreciate that they may modify the technical solutions described in the aforementioned embodiments or replace some or all of the technical features therein with equivalents. However, such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the various embodiments of this application.

Claims

1. A low voltage power distribution system, characterized in that: The system includes: a first DC voltage converter, a power supply and a distribution box; the distribution box includes a first power channel and a second power channel; The first end of the first power channel is connected to the first DC voltage converter, the second end of the first power channel is connected to the first end of the second power channel; and the second end of the second power channel is connected to the power supply; The power supply end of the first power supply channel and the power supply end of the second power supply channel are used to connect to a low-voltage load.

2. The system according to claim 1, wherein: The system further comprises: a second DC voltage converter, and the distribution box further comprises an isolating switch; The second DC voltage converter is connected to the third end of the second power supply channel; The second end of the first power channel is connected to the first end of the second power channel through the isolation switch.

3. The system according to claim 2, characterized in that The functional safety integrity level of the first DC voltage converter and the second DC voltage converter are both Class B, and the functional safety integrity level of the isolation switch is Class D.

4. The system according to claim 1, wherein: The power supply end of the first power supply channel is used to connect to the automatic driving controller.

5. The system according to claim 1, wherein: The power supply end of the second power supply channel is used to connect to the automatic driving controller.

6. The system according to claim 1 or 2, characterized in that The power supply end of the first power supply channel is used to connect to the first end of the automatic driving controller, and the power supply end of the second power supply channel is used to connect to the second end of the automatic driving controller.

7. The system according to claim 1, wherein: The power supply end of the first power supply channel is connected to the low-voltage load through a load switch, and the power supply end of the second power supply channel is connected to the low-voltage load through a load switch.

8. A low voltage power distribution method, characterized in that: The method is applied to a low-voltage power distribution system, which includes a first DC voltage converter, a power supply, and a distribution box; the distribution box includes a first power channel and a second power channel; The first end of the first power channel is connected to the first DC voltage converter, the second end of the first power channel is connected to the first end of the second power channel; and the second end of the second power channel is connected to the power supply; The power supply end of the first power supply channel and the power supply end of the second power supply channel are used to connect to a low-voltage load; The system further comprises: a second DC voltage converter, and the distribution box further comprises an isolating switch; The second DC voltage converter is connected to the third end of the second power supply channel; The second end of the first power channel is connected to the first end of the second power channel via the isolation switch; The method comprises: When the low-voltage power distribution system operates normally, the isolating switch is closed, and the first power supply channel is connected to the second power supply channel.

9. The method according to claim 8, characterized in that The functional safety integrity level of the first DC voltage converter and the second DC voltage converter are both Class B, and the functional safety integrity level of the isolation switch is Class D.

10. The method according to claim 8, characterized in that The method further comprises: When the low-voltage power distribution system fails, the isolation switch is disconnected, and the first power supply channel and the second power supply channel are powered independently.

11. A vehicle, characterized in that: The vehicle comprises: the low-voltage power distribution system according to any one of claims 1 to 7.

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