Vehicle-mounted power supply system

Abstract

The invention relates to a vehicle-mounted power supply system and a vehicle. The vehicle-mounted power supply system comprises a first power conversion module which converts a first voltage into a second voltage, a second voltage output end of the first power conversion module is connected to a first connection point, the first connection point is connected to a plurality of first loads, and the first voltage is larger than the second voltage; the second power conversion module provides conversion between a second voltage and a third voltage, a second voltage output end of the second power conversion module is connected to the first connection point, a third voltage output end of the second power conversion module is connected to a plurality of second loads, and the second voltage is greater than the third voltage; the first switch module is arranged between the second voltage output end of the first power conversion module and the first connection point; and the second switch module is arranged between the second voltage output end of the second power conversion module and the first connection point.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicles, and in particular to a vehicle-mounted power supply system and a vehicle. Background Art

[0002] At present, multiple voltage domains are arranged in the high and low voltage systems of vehicles (such as 800V or 900V high voltage domain, 48V voltage domain, 12V low voltage domain, etc.), and different voltage domains are arranged with different electrical devices and equipment. This poses challenges to the circuit topology and wiring harness distribution settings, and places higher requirements on the protection strategy for circuit short circuit, overload, overvoltage, undervoltage and overtemperature faults. Summary of the invention

[0003] In view of the above problems, the present disclosure is intended to provide an in-vehicle power supply system and a vehicle.

[0004] The vehicle power supply system of the first aspect of the present disclosure includes: a first power conversion module, which converts a first voltage into a second voltage, the second voltage output terminal of the first power conversion module is connected to a first connection point, the first connection point is connected to multiple first loads, and the first voltage is greater than the second voltage; a second power conversion module, which provides conversion between the second voltage and a third voltage, the second voltage output terminal of the second power conversion module is connected to the first connection point, the third voltage output terminal of the second power conversion module is connected to multiple second loads, and the second voltage is greater than the third voltage; a first switch module, which is arranged between the second voltage output terminal of the first power conversion module and the first connection point; and a second switch module, which is arranged between the second voltage output terminal of the second power conversion module and the first connection point.

[0005] According to some embodiments of the vehicle power supply system of the present disclosure, optionally, the third voltage output terminal of the second power conversion module is connected to the second connection point, and the second connection point is respectively connected to multiple second loads. The vehicle power supply system also includes a third switch module, and the third switch module is arranged between the third voltage output terminal of the second power conversion module and the second connection point.

[0006] According to the vehicle power supply system of some embodiments of the present disclosure, optionally, the third voltage output terminal of the second power conversion module is connected to the second connection point, and the second connection point is respectively connected to multiple second loads. The vehicle power supply system also includes multiple fourth switch modules corresponding to the multiple second loads one by one, and each fourth switch module is arranged between the second connection point and the corresponding second load.

[0007] According to the vehicle power supply system of some embodiments of the present disclosure, optionally, the vehicle power supply system also includes a plurality of fifth switch modules corresponding one-to-one to the plurality of first loads, and each fifth switch module is arranged between the first connection point and the corresponding first load.

[0008] According to the vehicle power supply system of some embodiments of the present disclosure, optionally, the vehicle power supply system also includes a first power supply and a sixth switch module, the first power supply is connected to the first connection point and provides a second voltage, and the sixth switch module is arranged between the first power supply and the first connection point.

[0009] According to the in-vehicle power supply system of some embodiments of the present disclosure, optionally, the first load includes an active suspension system, and the second load includes a steering system.

[0010] According to the vehicle power supply system of some embodiments of the present disclosure, optionally, the second voltage includes a 48V voltage, and the third voltage includes a 12V voltage.

[0011] According to the vehicle power supply system of some embodiments of the present disclosure, optionally, the first power conversion module includes a high-low voltage DC converter, and the second power conversion module includes a 48V / 12V bidirectional DC converter.

[0012] According to the in-vehicle power supply system of some embodiments of the present disclosure, optionally, the switch module is configured to be unidirectionally conductive.

[0013] A vehicle according to a second aspect of the present disclosure comprises an on-board power supply system according to any of the aforementioned embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A module schematic diagram of a vehicle power supply system 100 according to some embodiments of the present disclosure is shown.

[0015] Figure 2 A module schematic diagram of a first power conversion module 200 according to some embodiments of the present disclosure is shown.

[0016] Figure 3 A module schematic diagram of a second power conversion module 300 according to some embodiments of the present disclosure is shown.

[0017] Figure 4 A schematic diagram of current dynamic response according to some embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0018] The following describes some of the various embodiments of the present disclosure, which are intended to provide a basic understanding of the present disclosure, but are not intended to identify the key or decisive elements of the present disclosure or to limit the scope of protection.

[0019] For brevity and illustrative purposes, the principles of the present disclosure are described herein mainly with reference to its exemplary embodiments. However, those skilled in the art will readily recognize that the same principles are equally applicable to and can be implemented in all types of on-board power supply systems and vehicles, and that any such changes do not depart from the true spirit and scope of the present patent application.

[0020] Moreover, in the following description, reference is made to the accompanying drawings, which illustrate specific exemplary embodiments. Electrical, mechanical, logical and structural changes may be made to these embodiments without departing from the spirit and scope of the present disclosure. In addition, although the features of the present disclosure are disclosed in conjunction with only one of several implementations / embodiments, this feature may be combined with one or more other features of other implementations / embodiments as may be desired and / or advantageous for any given or identifiable function. Therefore, the following description should not be regarded as limiting, and the scope of the present disclosure is defined by the appended claims and their equivalents.

[0021] Terms such as “having” and “including” indicate that in addition to the units (modules) and steps directly and explicitly stated in the specification and claims, the technical solution of the present disclosure does not exclude the situation where it has other units (modules) and steps that are not directly or explicitly stated.

[0022] Figure 1 A module schematic diagram of a vehicle power supply system 100 according to some embodiments of the present disclosure is shown. The vehicle power supply system 100 includes a first power conversion module 110 , a second power conversion module 120 , a first switch module 132 and a second switch module 134 .

[0023] The first power conversion module 110 converts the first voltage into a second voltage. The second voltage output terminal of the first power conversion module 110 is connected to the first connection point ( Figure 1 The first connection point A is connected to a plurality of first loads 180 (two first loads are shown in the figure, but it can be understood that it is not limited to two), and the first voltage is greater than the second voltage. In some examples, the first power conversion module 110 can convert a higher first voltage into a lower second voltage and output it to the connection point A, so the first power conversion module 110 can be any form of high-low voltage converter, such as a DC-DC buck converter, a flyback / forward converter, a half-bridge / full-bridge converter, an LLC resonant converter, etc. For example, the first power conversion module 110 can be an 800V / 48V DC-DC converter, that is, converting a high voltage (such as 800V, 900V or other high voltages such as 500-930V) into a low voltage (such as 48V or other low voltages such as 36-52V).

[0024] Figure 2 FIG. 2 shows a schematic diagram of a first power conversion module 200 according to some embodiments of the present disclosure. Figure 2The left side is the high-voltage side, which inputs a higher voltage (the input voltage range is, for example, 500V to 930V). It includes four semiconductor switching elements (such as insulated gate bipolar transistors IGBT) Q1, Q2, Q3, and Q4, forming a full-bridge inverter structure. The four semiconductor switching elements perform switching operations through control signals to convert DC high voltage into AC high voltage, and then perform voltage conversion through a transformer (Np). The primary side (primary side) (Np) of the transformer is connected to the semiconductor switching element bridge (such as an IGBT bridge) on the high-voltage side, and efficient energy transmission can be achieved through, for example, high-frequency switching operations. Figure 2 The right side is the low-voltage side, including multiple semiconductor switching elements (such as IGBT) Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14 and an inductor Lf. The output voltage range of the low-voltage side is 36V to 52V, which is used to drive low-voltage loads or charge batteries. The multiple semiconductor switching elements on the low-voltage side also constitute a full-bridge rectifier structure, which performs switching operations through control signals to convert the AC voltage on the secondary side (secondary side) of the transformer (Ns1, Ns2) into a DC low voltage. Among them, the inductor Lf is used for filtering to ensure the smoothness and stability of the output voltage, and the capacitor Cb constitutes a buffer capacitor, which is used to store energy and provide buffering, protection and other functions during the switching process. Figure 2 The power conversion module can achieve efficient conversion from high voltage DC to low voltage DC, while providing electrical isolation to ensure the safety and reliability of the system.

[0025] The second power conversion module 120 provides conversion between the second voltage and the third voltage. The second voltage output terminal of the second power conversion module 120 is connected to the first connection point A. The third voltage output terminal of the second power conversion module 120 is connected to the plurality of second loads 170. The second voltage is greater than the third voltage. In some examples, the second power conversion module 120 can convert the higher second voltage into a lower third voltage and output it to, for example, Figure 1 The second power conversion module 120 is connected to the connection point B on the power supply 110 and is respectively connected to the plurality of second loads 170 through the connection point B. In other examples, the second power conversion module 120 can convert the lower third voltage into a higher second voltage and output it to the connection point A, thereby achieving reverse voltage conversion. Therefore, the second power conversion module 120 can be any form of voltage converter, especially a voltage converter in the low voltage domain, such as a 48V / 12VDC-DC bidirectional voltage converter, etc., which can provide voltage conversion between multiple low voltages (e.g., 48V and 12V).

[0026] Figure 3 FIG. 1 shows a schematic diagram of a second power conversion module 300 according to some embodiments of the present disclosure, which is mainly a multi-stage DC-DC bidirectional converter structure for converting high-voltage direct current into low-voltage direct current. Figure 3The structure includes multiple inductors (L1, L2, L3, L4) and capacitors (C7, C8, C9, C10, C11, C12, C13, C14) and multiple switching elements. These capacitor and inductor elements together constitute a circuit topology for filtering and voltage conversion. Among them, Figure 3 The capacitor group (C7, C8, C9, C10) on the left side is used for input filtering to ensure smoothness and stability of the input and output voltages on this side; Figure 3 The capacitor group (C11, C12, C13, C14) on the right side is used for filtering at the output end to ensure the smoothness and stability of the input and output voltages on this side. Each inductor (L1, L2, L3, L4) is combined with the corresponding capacitor and switching element to form a resonant circuit, and 4 parallel resonant circuits are formed to achieve efficient energy conversion. As shown in the figure, the input end (output end) on the left is connected to the DC-DC 48V input and output, and the output end (input end) on the right is connected to the DC-DC 12V input and output. Through the combination of multi-stage inductors and capacitors, the structure can effectively convert 48V high voltage to 12V low voltage, or convert 12V low voltage to 48V high voltage.

[0027] The first switch module 132 is arranged between the second voltage output terminal of the first power conversion module 110 and the first connection point A; and the second switch module 134 is arranged between the second voltage output terminal of the second power conversion module 120 and the first connection point A. The first switch module 132 is located at the second voltage output terminal of the first power conversion module 110, and can cut off the current of the circuit part of the first power conversion module 110 to the first voltage side (for example, the high voltage side) when a short circuit or other fault (such as overload, overvoltage, undervoltage and overtemperature) is detected at the output terminal of the first power conversion module 110, so as to prevent the second voltage output side (for example, the secondary side of the converter) of the first power conversion module 110 and other modules or components (for example, the first load, etc.) in the circuit from being damaged. At this time, other modules or components (for example, the first load, etc.) in the circuit are still turned on. The second switch module 134 is installed on one side of the second power conversion module 120. When the second power conversion module 120 fails such as a short circuit, the second switch module 134 can disconnect the second voltage side of the second power conversion module 120 from other circuit parts (such as the first load, etc.), preventing the current from continuing to flow to the fault point or to the load, thereby protecting the second power conversion module 120 and the components connected thereto from damage. At this time, other modules or components in the circuit (such as the first load, the first battery, the first power conversion module, etc.) are still turned on. Therefore, it can be understood that in some examples, the first switch module 132 and the second switch module 134 can be unidirectionally conductive. By setting the switch of the first switch module 132 in conjunction with the second switch module 134, the connection with the faulty power conversion module can be disconnected in time when a power conversion module fails, and the other power conversion module can continue to function, thereby realizing the adaptation of the vehicle-mounted power supply system 100 to various situations.

[0028] The present disclosure converts high voltage electricity such as 900V into low voltage electricity such as 48V and 12V through the connection of two-stage power conversion modules and the design of switch modules, which can be used for various types of vehicle loads. In addition, the switch module is used to achieve fast short-circuit protection, thereby improving the safety and reliability of the vehicle power supply system. In addition, there is no need to set up a battery (such as a 12V low-voltage battery) to provide a third voltage to the load, which reduces the number of battery arrangements, and can optimize the current dynamic response time and volt-ampere characteristics of the load, simplifying the power supply architecture of the vehicle.

[0029] In some embodiments, the third voltage output terminal of the second power conversion module is connected to the second connection point ( Figure 1The vehicle power supply system 100 may further include a third switch module 136, which is arranged between the third voltage output terminal of the second power conversion module 120 and the second connection point B. The arrangement of the third switch module 136 can ensure that the third voltage output from the second power conversion module 120 can be safely distributed to the plurality of second loads 170. For example, in electric vehicles, the third voltage is usually 12V, which is used to power low-power devices such as car lights and audio systems. The function of the third switch module 136 is, for example, to quickly cut off the connection with the load when any load abnormality (such as short circuit or overload) is detected, thereby protecting the entire circuit from damage; for another example, when the second power conversion module 120 itself has a short circuit or other fault, the third switch module 136 can also quickly cut off the output to prevent the fault current from flowing into the second connection point B and the plurality of second loads 170 downstream thereof, thereby further protecting the safety of these devices. This improves the safety, stability and reliability of the power supply system.

[0030] In some embodiments, the third voltage output terminal of the second power conversion module is connected to the second connection point B, and the second connection point B is respectively connected to a plurality of second loads 170. The vehicle power supply system 100 may also include a plurality of fourth switch modules 140 corresponding to the plurality of second loads 170, and each fourth switch module is arranged between the second connection point B and the corresponding second load. The arrangement of the plurality of fourth switch modules 140 enables each second load to have an independent control switch, which enables more refined management and protection of each load. For example, when a certain steering system (second load) fails, the corresponding fourth switch module will automatically disconnect to prevent the fault current from further affecting other circuit parts, or avoid the fault current from flowing into each load when a short circuit or other fault (such as overload, overvoltage, undervoltage and overtemperature, etc.) occurs in the second power conversion module 120. This improves the troubleshooting flexibility of the power supply system, makes troubleshooting and maintenance easier, and also reduces unnecessary power supply system downtime.

[0031] In some embodiments, the vehicle power supply system 100 may also include a plurality of fifth switch modules 150 corresponding to a plurality of first loads 180, each fifth switch module being arranged between the first connection point A and the corresponding first load. Among them, the first load 180 may, for example, refer to a device that requires a certain voltage (such as 48V) for power supply, such as an active suspension system, etc. The arrangement of the fifth switch module 150 enables each first load to have an independent switch protection device, which can quickly cut off the connection with the load when a load fails, so as to avoid the short circuit and other faults of the load from affecting other parts of the power supply system, or to avoid the fault current from flowing into each load when a short circuit or other fault occurs in the second power conversion module 120 or the first power conversion module 110. This also improves the troubleshooting flexibility of the power supply system, making troubleshooting and maintenance easier, and also reducing unnecessary power supply system downtime. For example, in an active suspension system, each suspension control unit is equipped with an independent fifth switch module to ensure that even if one of the units fails, the other units can still work normally and maintain the driving performance of the vehicle.

[0032] In some embodiments, the vehicle power supply system 100 may further include a first power supply 160 and a sixth switch module 162, the first power supply 160 is connected to the first connection point A and provides a second voltage, and the sixth switch module 162 is arranged between the first power supply 160 and the first connection point A. The first power supply 160 is, for example, a 48V battery pack, which is used to provide emergency power support when the main power supply (such as an 800V high-voltage battery) fails. The function of the sixth switch module 162 is to monitor the status of the main power supply, and once a main power supply failure is detected, immediately switch to the first power supply 160 to ensure that the system does not completely stop working due to power interruption. For example, when a short circuit fault occurs in the first power conversion module 110, the connection with the first power conversion module 110 can be cut off through the first switch module 132, and the sixth switch module can be turned on to allow the first power supply 160 to continue to supply power to multiple first loads 180, and / or provide the second power conversion module 120 with a second voltage for conversion to a third voltage for use by multiple second loads 170. In this way, the redundancy and fault tolerance of the power supply system can be improved, so that the low-voltage equipment (first load and second load) can continue to be used normally in the event of a failure of the 800V high-voltage battery or a failure of the high-to-low voltage conversion module (first power conversion module 110).

[0033] The on-board power supply system architecture of certain embodiments of the present disclosure can realize the conversion of, for example, 800V high voltage to 48V low voltage, so as to power a 48V load, and set a switch module at, for example, the output end of the high-low voltage converter and the input end of the load for, for example, short-circuit protection. When the connection with the high-low voltage converter is cut off, the 48V load can still be powered by the first power supply 160 (for example, a 48V battery pack). The second power conversion module 120 further converts the 48V voltage into a lower low voltage, for example, 12V, so as to power a 12V load, and sets a switch module at, for example, the input and output end of the power conversion module and the input end of the load for, for example, short-circuit protection. The second power conversion module 120 is bidirectional, so it can recover energy from the 12V load and perform a voltage conversion from 12V to 48V, which can further ensure the power supply of the 48V load and / or the charging of the first power supply 160. Similarly, energy recovery (power) from a 48V load (for example, an active suspension system) can also be used to power the 12V load and / or charge the first power supply 160 through the second power conversion module 120. Therefore, the vehicle power supply system disclosed in the present invention can take into account various power conversions, energy recovery and circuit protection, and provide flexible circuit fault handling and better circuit current dynamic response.

[0034] In some embodiments, a first load in the plurality of first loads 180 may include an active suspension system, such as Figure 1 The active suspension system on the right side of the dashed box 180 shown in FIG. 1 includes suspension system connection points corresponding to the four tires, and is connected to the connection point A via four fifth modules respectively. The second load in the plurality of second loads 170 may include a steering system, for example Figure 1 The two steering systems in the lower part of the dotted box 170 shown in FIG. 1 are connected to the connection point B via two sixth switch modules. In this way, each key system can have an independent power management and protection mechanism, which improves the overall reliability and safety of the system. For example, the active suspension system is independently controlled by four fifth switch modules to ensure that even if the suspension system of one tire fails, the suspension systems of other tires can still work normally to maintain the smooth driving of the vehicle. Similarly, the two steering systems ( Figure 1 The two sub-boxes in box 170 are independently controlled by two sixth switch modules. Even if one steering system fails, the other system can still take over to ensure the controllability of the vehicle.

[0035] In some embodiments, the second voltage includes a 48V voltage, and the third voltage includes a 12V voltage. At this time, for example, the first power conversion module 110 can be a high-low voltage DC converter, such as an 800V / 48V DC-DC converter, and the second power conversion module 120 can be a 48V / 12V bidirectional DC converter. The 800V / 48V DC-DC converter is responsible for efficiently converting the electrical energy of the high-voltage battery into a 48V voltage suitable for high-power consumption equipment, while the 48V / 12V bidirectional DC converter further converts the 48V voltage into a 12V voltage suitable for low-power consumption equipment. This design not only reduces energy loss, but also meets the different voltage requirements of different loads, thereby improving energy utilization efficiency. In addition, the bidirectional DC converter enables the 12V system (e.g., 12V load) to reversely charge the 48V system (e.g., 48V load or battery pack) when necessary, increasing the flexibility and emergency handling capabilities of the system.

[0036] In some embodiments, all or part of the above-mentioned switch modules (first to sixth switch modules) can be configured to be unidirectionally conductive. For example, a metal oxide field effect transistor MOSFET parallel body diode can be used to form a unidirectional conductive switch device. This means that these switch modules only allow current to flow in one direction under normal working conditions, thereby preventing reverse current from damaging the system. For example, the first switch module 132 can be configured to be unidirectionally conductive, ensuring that only when the first power conversion module 110 is working normally, the current can flow from the first power conversion module 110 to the first connection point A. Similarly, for example, when the second power conversion module 120 has a short circuit or other fault, the third switch module 136 can cut off the current from the second power conversion module 120 to each second load, and when one or more second loads 170 have these faults, the corresponding fourth switch module in the plurality of fourth switch modules 140 cuts off the current from the second power conversion module 120 to the corresponding faulty second load (while the second load is still conductive to the second power conversion module 120). In this way, the safety, stability and reliability of loads, power conversion systems and batteries at various locations in the vehicle power supply system can be improved, ensuring that each load and power module can work normally under their respective working conditions without affecting each other.

[0037] In addition, the switch module can also be integrated with some detection modules and alarm modules. For example, the switch module can be connected in parallel with a current and voltage detection device and an alarm device to perform current and voltage detection and early warning on the line where the corresponding switch module is located. When it is detected that the current on the corresponding line is too large or too small, an alarm can be used to indicate that a fault has occurred in the corresponding circuit part, such as the short circuit fault of the power conversion module described above. In this way, the switch module can be controlled in time to perform a switching action to perform corresponding circuit protection (such as short circuit protection).

[0038] Figure 4 The current dynamic response diagram according to some embodiments of the present disclosure is shown, which includes the current response characteristics of two different power supply systems. Among them, curve a represents the current response of the vehicle power supply system of some embodiments of the present disclosure (it can be any position in the circuit, such as Figure 1 Point B or point A), curve b represents the current response of the current power supply system architecture. Figure 4 It can be seen that in curve a, the current rises rapidly from Ic to the peak value Ip in the time period from t1 to t2, and remains stable in the time period from t2 to t3 and the subsequent time period, and then the current drops rapidly to t5 in the time period to t4 and remains stable until t6. In contrast, the current response of curve b rises slowly in the time period from t1 to t2, and can only reach the peak value Ip in the time period from t2 to t3, and then it takes longer than t4 to t5 to drop. It can be seen that the vehicle-mounted power supply system disclosed in the present invention improves the speed of current response and improves the volt-ampere characteristics of the power supply system line, which improves the reaction speed of the entire power supply system in special circumstances (such as emergency braking).

[0039] According to another aspect of the present disclosure, a vehicle including an on-board power supply system according to any embodiment of the present disclosure is also provided. The vehicle referred to in this application is intended to represent any appropriate vehicle having a drive system, such as a fuel-powered vehicle, a hybrid vehicle, an electric vehicle, a plug-in hybrid electric vehicle, etc.

[0040] The above mainly describes the on-board power supply system and vehicle of the present disclosure. Although only some of the specific embodiments of the present disclosure are described, it should be understood by those skilled in the art that the present disclosure can be implemented in many other forms without departing from its subject matter and scope. Therefore, the examples and embodiments shown are regarded as illustrative rather than restrictive, and the present disclosure may cover various modifications and substitutions without departing from the spirit and scope of the present disclosure as defined in the appended claims.

Claims

1. A vehicle-mounted power supply system, characterized in that: include: a first power conversion module, which converts a first voltage into a second voltage, wherein a second voltage output terminal of the first power conversion module is connected to a first connection point, the first connection point is connected to a plurality of first loads, and the first voltage is greater than the second voltage; a second power conversion module, which provides conversion between the second voltage and a third voltage, wherein a second voltage output terminal of the second power conversion module is connected to the first connection point, a third voltage output terminal of the second power conversion module is connected to a plurality of second loads, and the second voltage is greater than the third voltage; A first switch module, which is arranged between the second voltage output terminal of the first power conversion module and the first connection point; as well as The second switch module is arranged between the second voltage output terminal of the second power conversion module and the first connection point.

2. The vehicle-mounted power supply system according to claim 1, characterized in that: The third voltage output terminal is connected to a second connection point, and the second connection points are respectively connected to the multiple second loads. The vehicle power supply system also includes a third switch module, and the third switch module is arranged between the third voltage output terminal of the second power conversion module and the second connection point.

3. The vehicle-mounted power supply system according to claim 1, characterized in that: The third voltage output terminal is connected to a second connection point, and the second connection point is respectively connected to the multiple second loads. The vehicle power supply system also includes a plurality of fourth switch modules corresponding one by one to the multiple second loads, and each of the fourth switch modules is arranged between the second connection point and the corresponding second load.

4. The vehicle-mounted power supply system according to claim 1, characterized in that: The vehicle power supply system further includes a plurality of fifth switch modules corresponding one-to-one to the plurality of first loads, and each of the fifth switch modules is arranged between the first connection point and the corresponding first load.

5. The vehicle-mounted power supply system according to claim 1, characterized in that: The vehicle power supply system also includes a first power supply and a sixth switch module. The first power supply is connected to the first connection point and provides the second voltage. The sixth switch module is arranged between the first power supply and the first connection point.

6. The vehicle-mounted power supply system according to claim 1, characterized in that: The first load includes an active suspension system and the second load includes a steering system.

7. The vehicle-mounted power supply system according to claim 1, characterized in that: The second voltage includes a 48V voltage, and the third voltage includes a 12V voltage.

8. The vehicle-mounted power supply system according to claim 1, characterized in that: The first power conversion module includes an 800V / 48V DC converter, and the second power conversion module includes a 48V / 12V bidirectional DC converter.

9. The vehicle-mounted power supply system according to claim 1, characterized in that: The switch module is configured to be unidirectionally conductive.

10. A vehicle, characterized in that: The vehicle comprises the on-board power supply system according to any one of claims 1-9.

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