A power supply and distribution system for a vehicle

Abstract

The application discloses a power supply and distribution system of a vehicle and relates to the technical field of low-voltage power supply and distribution, which comprises a first power conversion device and a second power conversion device. The first power conversion device and the second power conversion device are connected in parallel. The first power conversion device and the second power conversion device output power supply signals to supply loads of a rear circuit through a parallel current sharing control method. The parallel current sharing control method is adopted between the two power conversion devices of the application. When one of the power conversion devices fails, the other power conversion device can be switched to supply power to the loads of the rear circuit, so that the normal work of the vehicle is not affected, and the reliability and safety of the vehicle operation are further improved.

Description

Technical Field

[0001] This invention relates to the field of low-voltage power supply and distribution technology for vehicles, and more particularly to a power supply and distribution system for vehicles. Background Technology

[0002] The low-voltage power supply system of electric vehicles provides low-voltage power to the control units of systems such as autonomous driving, electric drive, steer-by-wire, and brake-by-wire. If the low-voltage power supply fails, the control units will malfunction, causing the electric drive, steering, and braking systems to fail, leading to driving safety issues. Currently, electric vehicles use a battery and a power conversion device connected in parallel as their power source, supplying power to the electrical loads through a power distribution system. This can be further divided into three types: single battery + single power conversion device, single battery + dual power conversion device, and dual batteries + single power conversion device. The dual power conversion device system typically uses cold backup. A detection device monitors the status of the main power conversion device; if the main power conversion device malfunctions, an external circuit switches to isolate the main power conversion device and connect the auxiliary power conversion device to the circuit. These three system configurations improve the reliability of the power supply system to some extent.

[0003] For a single-battery system, if the battery is depleted or damaged, the system cannot power on normally, and the vehicle cannot move. For a single power conversion device system, if it fails and cannot output 28V power normally, the system can only rely on battery power for short-term emergency operation. For a dual power conversion device system with cold backup, the switching between the main and auxiliary power conversion devices is achieved through detection circuits and switching circuits, which makes the circuit complex and reduces reliability. Summary of the Invention

[0004] The purpose of this invention is to provide a vehicle power supply and distribution system in which a parallel current sharing control method is adopted between the dual power conversion devices, thereby further improving the reliability and safety of the vehicle operation.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] One aspect of this invention provides a power supply and distribution system for a vehicle. The system includes a first power conversion device and a second power conversion device connected in parallel. The first and second power conversion devices output power signals to the load of a downstream circuit through a parallel current sharing control method. The parallel current sharing control method includes: acquiring a first output current of the first power conversion device; acquiring a second output current of the second power conversion device; calculating an average current value between the first and second output currents; comparing the average current value with the first output current using a comparator to obtain a first comparison result; adjusting the value of the first output current based on the first comparison result; comparing the average current value with the second output current using a comparator to obtain a second comparison result; and adjusting the value of the second output current based on the second comparison result to achieve parallel current sharing between the first and second power conversion devices.

[0007] In some embodiments, the power supply and distribution system further includes a first rechargeable battery and a battery switch, wherein the positive terminal of the first rechargeable battery is connected to one end of the battery switch, the negative terminal of the first rechargeable battery is connected to the negative output terminals of the first power conversion device and the second power conversion device and the negative terminals of each parallel load, and the other end of the battery switch is connected to the positive output terminals of the first power conversion device and the second power conversion device.

[0008] In some embodiments, the power supply and distribution system further includes a second rechargeable battery connected in parallel with the first rechargeable battery.

[0009] In some embodiments, both the first rechargeable battery and the second rechargeable battery are rechargeable batteries.

[0010] In some embodiments, the power supply and distribution system further includes a first low-voltage power distribution unit, a first drive system, a first braking system, a first steering system, a first vehicle control system, and other electrical loads. One end of the first low-voltage power distribution unit is connected to the positive output terminal of the first power conversion device and the second power conversion device. The other end of the first low-voltage power distribution unit is connected to one end of the first drive system, the first braking system, the first steering system, the first vehicle control system, and the other electrical loads, respectively. The other ends of the first drive system, the first braking system, the first steering system, the first vehicle control system, and the other electrical loads are connected to the negative output terminal of the first power conversion device and the second power conversion device.

[0011] In some embodiments, the power supply and distribution system further includes a second low-voltage power distribution unit, a second drive system, a second braking system, a second steering system, a second vehicle control system, and other electrical loads. One end of the second low-voltage power distribution unit is connected to the positive output terminals of the first power conversion device and the second power conversion device. The other end of the second low-voltage power distribution unit is connected to one end of the second drive system, the second braking system, the second steering system, the second vehicle control system, and the other electrical loads, respectively. The other ends of the second drive system, the second braking system, the second steering system, the second vehicle control system, and the other electrical loads are connected to the negative output terminals of the first power conversion device and the second power conversion device.

[0012] In some embodiments, both the first low-voltage distribution unit and the second low-voltage distribution unit include an overvoltage protection control method. The overvoltage protection control method includes: acquiring a real-time voltage value of the first low-voltage distribution unit or the second low-voltage distribution unit; acquiring a preset voltage value; comparing the real-time voltage value and the preset voltage value; and when the real-time voltage value exceeds the preset voltage value, shutting off or reducing the output of the first low-voltage distribution unit or the second low-voltage distribution unit to achieve overvoltage protection.

[0013] In some embodiments, both the first low-voltage distribution unit and the second low-voltage distribution unit include an overcurrent protection control method. The overcurrent protection control method includes: acquiring a real-time current value of the first low-voltage distribution unit or the second low-voltage distribution unit; acquiring a preset current value; comparing the real-time current value and the preset current value; and when the real-time current value exceeds the preset current value, shutting off or reducing the output of the first low-voltage distribution unit or the second low-voltage distribution unit to achieve the purpose of overcurrent protection.

[0014] In some embodiments, both the first low-voltage power distribution unit and the second low-voltage power distribution unit include an over-temperature protection control method. The over-temperature protection control method includes: acquiring a real-time temperature value of the first low-voltage power distribution unit or the second low-voltage power distribution unit; acquiring a preset temperature value; comparing the real-time temperature value and the preset temperature value; and reducing the output power of the first low-voltage power distribution unit or the second low-voltage power distribution unit when the real-time temperature value exceeds the preset temperature value, so as to achieve the purpose of over-temperature protection.

[0015] In some embodiments, both the first low-voltage distribution unit and the second low-voltage distribution unit include a short-circuit protection control method, the short-circuit protection control method including: acquiring the internal operating state of the first low-voltage distribution unit or the second low-voltage distribution unit; when a short circuit occurs inside the first low-voltage distribution unit or the second low-voltage distribution unit, shutting off the output of the first low-voltage distribution unit or the second low-voltage distribution unit to achieve the purpose of short-circuit protection.

[0016] According to an embodiment of the present invention, a power supply and distribution system for a vehicle has at least the following beneficial effects: The present application realizes the functions of power supply, distribution and control of the vehicle's electrical load through the power supply and distribution system. The system adopts a parallel connection of dual batteries and dual power conversion devices, and a parallel current sharing control method is adopted between the dual power conversion devices. The entire system has high redundancy and simple circuit, which greatly improves the reliability of the low-voltage power supply and distribution system of the electric drive vehicle and the safety of the entire vehicle.

[0017] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this disclosure. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is an electrical topology diagram of a power supply and distribution system according to an embodiment.

[0020] The reference numerals in the attached drawings are explained as follows: 1. First power conversion device; 2. Second power conversion device; 3. First low-voltage power distribution unit; 4. First drive system; 5. First braking system; 6. First steering system; 7. First vehicle control system; 8. Second low-voltage power distribution unit; 9. Second drive system; 10. Second braking system; 11. Second steering system; 12. Second vehicle control system. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the description of this disclosure will be more complete and fully convey the concept of the exemplary embodiments to those skilled in the art. The drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0026] The technical solutions of the embodiments of this application are briefly described below:

[0027] According to some embodiments, such as Figure 1 As shown, this application provides a power supply and distribution system for a vehicle, comprising a first power conversion device 1 and a second power conversion device 2 connected in parallel. The first power conversion device 1 and the second power conversion device 2 output power signals to the load of the downstream circuit through a parallel current sharing control method. The parallel current sharing control method includes:

[0028] Step 101: Obtain the first output current of the first power conversion device 1;

[0029] Step 102: Obtain the second output current of the second power conversion device 2;

[0030] Step 103: Calculate the average current value of the first output current and the second output current;

[0031] Step 104: Compare the average current value with the first output current through a comparator to obtain a first comparison result; adjust the value of the first output current according to the first comparison result; compare the average current value with the second output current through a comparator to obtain a second comparison result; adjust the value of the second output current according to the second comparison result, so as to realize the parallel current sharing of the first power conversion device and the second power conversion device.

[0032] Based on the above embodiments, such as Figure 1 As shown, the first power conversion device 1 obtains the first output current and the second output current through the CAN bus of the controller, calculates the average current value, compares the average current value and the first output current through a comparator, obtains the first comparison result, and adjusts the output of the first power conversion device 1 to form a loop regulation based on the first comparison result.

[0033] The second power conversion device 2 obtains the first output current and the second output current through the CAN bus of the controller, calculates the average current value, compares the average current value and the second output current through a comparator, obtains the second comparison result, and adjusts the output of the second power conversion device 2 based on the second comparison result to form a loop regulation.

[0034] Furthermore, the first power conversion device 1 and the second power conversion device 2 have a 600V high-voltage DC input and a 28V low-voltage DC output.

[0035] Specifically, in order to meet the requirements of redundant power supply, the output power of a single power conversion device can cover the needs of all low-voltage electrical loads. According to the calculation of electrical load, the rated output power of a single power conversion device is 5KW.

[0036] When one of the power conversion devices fails, the other power conversion device can be switched to supply power to the load of the downstream circuit without affecting the normal operation of the vehicle.

[0037] The dual power supply conversion device of this application adopts a parallel current sharing control method, which simplifies the circuit and greatly improves the reliability of the low-voltage power supply and distribution system of electric drive vehicles as well as the safety of the whole vehicle.

[0038] The following is in conjunction with the appendix to this instruction manual. Figure 1 The preferred embodiments of this disclosure will be further described in detail.

[0039] According to some embodiments, the power supply and distribution system further includes a first rechargeable battery G1 and a battery switch S0. The positive terminal of the first rechargeable battery G1 is connected to one end of the battery switch S0, the negative terminal of the first rechargeable battery G1 is connected to the negative output terminals of the first power conversion device 1 and the second power conversion device 2, as well as the negative terminals of each parallel load, and the other end of the battery switch S0 is connected to the positive output terminals of the first power conversion device 1 and the second power conversion device 2.

[0040] Based on the above embodiments, such as Figure 1 As shown, when the battery switch S0 is closed and the first power conversion device 1 and the second power conversion device 2 are activated, the first power conversion device 1 and the second power conversion device 2 supply power to the load of the downstream circuit while also charging the first rechargeable battery G1. When both the first power conversion device 1 and the second power conversion device 2 fail or are both disconnected, the first rechargeable battery G1 supplies power to the load of the downstream circuit.

[0041] According to some embodiments, the power supply and distribution system further includes a second rechargeable battery G2, which is connected in parallel with the first rechargeable battery G1.

[0042] Based on the above embodiments, when the battery switch S0 is closed and the first power conversion device 1 and the second power conversion device 2 are activated, the first power conversion device 1 and the second power conversion device 2 supply power to the load of the downstream circuit while also charging the first rechargeable battery G1 and the second rechargeable battery G2. When the first power conversion device 1, the second power conversion device 2, and the first rechargeable battery G1 all fail, the second rechargeable battery G2 supplies power to the load of the downstream circuit.

[0043] In some embodiments, both the first rechargeable battery G1 and the second rechargeable battery G2 are rechargeable batteries. The rechargeable batteries are 24V, 55AH maintenance-free lead-acid batteries.

[0044] According to some embodiments, such as Figure 1As shown, the power supply and distribution system also includes a first low-voltage power distribution unit 3, a first drive system 4, a first braking system 5, a first steering system 6, a first vehicle control system 7, and other electrical loads. One end of the first low-voltage power distribution unit 3 is connected to the positive output terminal of the first power conversion device 1 and the second power conversion device 2. The other end of the first low-voltage power distribution unit 3 is connected to one end of the first drive system 4, the first braking system 5, the first steering system 6, the first vehicle control system 7, and other electrical loads, respectively. The other ends of the first drive system 4, the first braking system 5, the first steering system 6, the first vehicle control system 7, and other electrical loads are connected to the negative output terminal of the first power conversion device 1 and the second power conversion device 2.

[0045] Furthermore, such as Figure 1 As shown, the power supply and distribution system also includes a second low-voltage power distribution unit 8, a second drive system 9, a second braking system 10, a second steering system 11, a second vehicle control system 12, and other electrical loads. One end of the second low-voltage power distribution unit 8 is connected to the positive output terminals of the first power conversion device 1 and the second power conversion device 2. The other end of the second low-voltage power distribution unit 8 is connected to one end of the second drive system 9, the second braking system 10, the second steering system 11, the second vehicle control system 12, and other electrical loads, respectively. The other ends of the second drive system 9, the second braking system 10, the second steering system 11, the second vehicle control system 12, and other electrical loads are connected to the negative output terminals of the first power conversion device 1 and the second power conversion device 2.

[0046] Based on the above embodiments, when the first low-voltage power distribution unit 3 fails, the first low-voltage power distribution unit 3 is shut down, and the first drive system 4, first braking system 5, first steering system 6, and first vehicle control system 7, etc., powered by the first low-voltage power distribution unit 3, are stopped from use. The second low-voltage power distribution unit 8, as well as the second drive system 9, second braking system 10, second steering system 11, second vehicle control system 12, and other electrical loads powered by the second low-voltage power distribution unit 8, are used.

[0047] When the second low-voltage power distribution unit 8 fails, it shuts off, stopping the operation of the second drive system 9, second braking system 10, second steering system 11, and second vehicle control system 12, which are powered by the second low-voltage power distribution unit 8. The first low-voltage power distribution unit 3 is then used, along with the first drive system 4, first braking system 5, first steering system 6, first vehicle control system 7, and other electrical loads powered by the first low-voltage power distribution unit 3.

[0048] According to some embodiments, both the first low-voltage distribution unit 3 and the second low-voltage distribution unit 8 include an overvoltage protection control method, the overvoltage protection control method including:

[0049] Step 201: Obtain the real-time voltage value of the first low-voltage distribution unit 3 or the second low-voltage distribution unit 8;

[0050] Step 202: Obtain the preset voltage value;

[0051] Step 203: Compare the real-time voltage value with the preset voltage value. When the real-time voltage value exceeds the preset voltage value, shut off or reduce the output of the first low-voltage distribution unit 3 or the second low-voltage distribution unit 8 to achieve overvoltage protection.

[0052] Based on the above embodiments, the real-time voltage value and the preset voltage value of the first low-voltage power distribution unit 3 are obtained. By comparing the real-time voltage value and the preset voltage value of the first low-voltage power distribution unit 3, if the real-time voltage value of the first low-voltage power distribution unit 3 exceeds the preset voltage value, the output of the first low-voltage power distribution unit 3 is turned off or reduced, which can effectively achieve the purpose of overvoltage protection.

[0053] The real-time voltage value and the preset voltage value of the second low-voltage power distribution unit 8 are obtained and compared. If the real-time voltage value of the second low-voltage power distribution unit 8 exceeds the preset voltage value, the output of the second low-voltage power distribution unit 8 is turned off or reduced, which can effectively achieve the purpose of overvoltage protection.

[0054] According to some embodiments, both the first low-voltage distribution unit 3 and the second low-voltage distribution unit 8 include an overcurrent protection control method, the overcurrent protection control method including:

[0055] Step 301: Obtain the real-time current value of the first low-voltage distribution unit 3 or the second low-voltage distribution unit 8;

[0056] Step 302: Obtain the preset current value;

[0057] Step 303: Compare the real-time current value with the preset current value. When the real-time current value exceeds the preset current value, turn off or reduce the output of the first low-voltage distribution unit 3 or the second low-voltage distribution unit 8 to achieve overcurrent protection.

[0058] Based on the above embodiments, the real-time current value and the preset current value of the first low-voltage power distribution unit 3 are obtained, and compared with the real-time current value and the preset current value of the first low-voltage power distribution unit 3. If the real-time current value of the first low-voltage power distribution unit 3 exceeds the preset current value, the output of the first low-voltage power distribution unit 3 is turned off or reduced, which can effectively achieve the purpose of overcurrent protection.

[0059] The real-time current value and the preset current value of the second low-voltage power distribution unit 8 are obtained and compared. If the real-time current value of the second low-voltage power distribution unit 8 exceeds the preset current value, the output of the second low-voltage power distribution unit 8 is turned off or reduced, which can effectively achieve the purpose of overcurrent protection.

[0060] According to some embodiments, both the first low-voltage distribution unit 3 and the second low-voltage distribution unit 8 include an over-temperature protection control method, the over-temperature protection control method including:

[0061] Step 401: Obtain the real-time temperature value of the first low-voltage distribution unit 3 or the second low-voltage distribution unit 8;

[0062] Step 402: Obtain the preset temperature value;

[0063] Step 403: Compare the real-time temperature value with the preset temperature value. When the real-time temperature value exceeds the preset temperature value, reduce the output power of the first low-voltage distribution unit 3 or the second low-voltage distribution unit 8 to achieve over-temperature protection.

[0064] Based on the above embodiments, the real-time temperature value and the preset temperature value of the first low-voltage power distribution unit 3 are obtained. By comparing the real-time temperature value and the preset temperature value of the first low-voltage power distribution unit 3, if the real-time temperature value of the first low-voltage power distribution unit 3 exceeds the preset temperature value, the output of the first low-voltage power distribution unit 3 is reduced, which can effectively achieve the purpose of over-temperature protection.

[0065] The real-time temperature value and the preset temperature value of the second low-voltage power distribution unit 8 are obtained and compared. If the real-time temperature value of the second low-voltage power distribution unit 8 exceeds the preset temperature value, the output of the second low-voltage power distribution unit 8 is reduced, which can effectively achieve the purpose of over-temperature protection.

[0066] According to some embodiments, both the first low-voltage distribution unit 3 and the second low-voltage distribution unit 8 include a short-circuit protection control method, the short-circuit protection control method including:

[0067] Step 501: Obtain the internal operating status of the first low-voltage distribution unit 3 or the second low-voltage distribution unit 8;

[0068] Step 502: When a short circuit occurs inside the first low-voltage power distribution unit 3 or the second low-voltage power distribution unit 8, the output of the first low-voltage power distribution unit 3 or the second low-voltage power distribution unit 8 is turned off to achieve the purpose of short circuit protection.

[0069] Specifically, when a short circuit occurs inside the first low-voltage distribution unit 3, the output of the first low-voltage distribution unit 3 is shut off; when a short circuit occurs inside the second low-voltage distribution unit 8, the output of the second low-voltage distribution unit 8 is shut off, so as to achieve the purpose of short circuit protection.

[0070] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0071] Although this disclosure has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Because this disclosure can be embodied in many forms without departing from the spirit or substance of this application, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A power supply and distribution system for a vehicle, characterized in that, The power supply and distribution system includes a first power conversion device and a second power conversion device, which are connected in parallel. The first and second power conversion devices output power signals to the load of the downstream circuit through a parallel current sharing control method. The parallel current sharing control method includes: Obtain the first output current of the first power conversion device; Obtain the second output current of the second power conversion device; Calculate the average current value of the first output current and the second output current; The average current value is compared with the first output current through a comparator to obtain a first comparison result. The value of the first output current is adjusted according to the first comparison result. The average current value is compared with the second output current through a comparator to obtain a second comparison result. The value of the second output current is adjusted according to the second comparison result to achieve parallel current sharing between the first power conversion device and the second power conversion device. The power supply and distribution system also includes a first rechargeable battery and a battery switch. The positive terminal of the first rechargeable battery is connected to one end of the battery switch, the negative terminal of the first rechargeable battery is connected to the negative output terminals of the first power conversion device and the second power conversion device, as well as the negative terminals of each parallel load, and the other end of the battery switch is connected to the positive output terminals of the first power conversion device and the second power conversion device. The power supply and distribution system also includes a second rechargeable battery, which is connected in parallel with the first rechargeable battery; The power supply and distribution system further includes a first low-voltage power distribution unit, a first drive system, a first braking system, a first steering system, a first vehicle control system, and other electrical loads. One end of the first low-voltage power distribution unit is connected to the positive output terminal of the first power conversion device and the second power conversion device. The other end of the first low-voltage power distribution unit is connected to one end of the first drive system, the first braking system, the first steering system, the first vehicle control system, and the other electrical loads. The other end of the first drive system, the first braking system, the first steering system, the first vehicle control system, and the other electrical loads is connected to the negative output terminal of the first power conversion device and the second power conversion device. The power supply and distribution system further includes a second low-voltage power distribution unit, a second drive system, a second braking system, a second steering system, a second vehicle control system, and other electrical loads. One end of the second low-voltage power distribution unit is connected to the positive output terminals of the first power conversion device and the second power conversion device. The other end of the second low-voltage power distribution unit is connected to one end of the second drive system, the second braking system, the second steering system, the second vehicle control system, and the other electrical loads, respectively. The other ends of the second drive system, the second braking system, the second steering system, the second vehicle control system, and the other electrical loads are connected to the negative output terminals of the first power conversion device and the second power conversion device.

2. The power supply and distribution system according to claim 1, characterized in that, Both the first rechargeable battery and the second rechargeable battery are rechargeable batteries.

3. The power supply and distribution system according to claim 1, characterized in that, Both the first low-voltage distribution unit and the second low-voltage distribution unit include an overvoltage protection control method, the overvoltage protection control method including: Obtain the real-time voltage value of the first low-voltage distribution unit or the second low-voltage distribution unit; Obtain the preset voltage value; By comparing the real-time voltage value with the preset voltage value, when the real-time voltage value exceeds the preset voltage value, the output of the first low-voltage distribution unit or the second low-voltage distribution unit is turned off or reduced to achieve overvoltage protection.

4. The power supply and distribution system according to claim 1, characterized in that, Both the first low-voltage distribution unit and the second low-voltage distribution unit include an overcurrent protection control method, the overcurrent protection control method including: Obtain the real-time current value of the first low-voltage distribution unit or the second low-voltage distribution unit; Obtain the preset current value; By comparing the real-time current value with the preset current value, when the real-time current value exceeds the preset current value, the output of the first low-voltage distribution unit or the second low-voltage distribution unit is turned off or reduced to achieve the purpose of overcurrent protection.

5. The power supply and distribution system according to claim 1, characterized in that, Both the first low-voltage distribution unit and the second low-voltage distribution unit include an over-temperature protection control method, the over-temperature protection control method including: Obtain the real-time temperature value of the first low-voltage distribution unit or the second low-voltage distribution unit; Obtain the preset temperature value; By comparing the real-time temperature value with the preset temperature value, when the real-time temperature value exceeds the preset temperature value, the output power of the first low-voltage distribution unit or the second low-voltage distribution unit is reduced to achieve over-temperature protection.

6. The power supply and distribution system according to claim 1, characterized in that, Both the first low-voltage distribution unit and the second low-voltage distribution unit include a short-circuit protection control method, which includes: Obtain the internal operating status of the first low-voltage power distribution unit or the second low-voltage power distribution unit; When a short circuit occurs inside the first low-voltage distribution unit or the second low-voltage distribution unit, the output of the first low-voltage distribution unit or the second low-voltage distribution unit is shut off to achieve the purpose of short circuit protection.

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