Low-voltage power supply and vehicle power supply system

Abstract

The utility model provides a low-voltage power supply and a vehicle power supply system, and belongs to the technical field of automobiles. The low-voltage power supply comprises a super capacitor module, a first switch and a direct-current converter, the first end of the super-capacitor module is connected with the output end of the direct-current converter through the first switch, and the second end of the super-capacitor module is grounded; the first switch is configured to be closed when a collision signal is detected; the input end of the direct-current converter is connected with a direct-current power supply, and the output end of the direct-current converter is also used for supplying power to each load; wherein the capacity of the super capacitor module is greater than a preset capacity. The super-capacitor module is arranged at the output end of the direct-current converter, when the vehicle collides, the super-capacitor module is connected, due to the existence of the super-capacitor module, the voltage of the output end of the direct-current converter cannot be pulled down in a short time, and part of loads needing power protection, such as loads needing power protection, are ensured. And the door lock controller can still guarantee power supply in a short time, so that the safety and the reliability of the vehicle are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a low-voltage power supply and a vehicle power supply system. Background Art

[0002] With the development of the automotive industry, cars are increasingly involved in our daily life and work, and the vehicle ownership in China has reached 345 million. With the popularization of cars, vehicle accidents are also increasing. Therefore, the safety and reliability of cars are of crucial importance.

[0003] In the prior art, low-voltage loads in a vehicle are usually uniformly powered by a low-voltage power supply. When a vehicle collides, if some loads are short-circuited, the voltage of the low-voltage power supply may be pulled down, resulting in power loss of a door lock controller, a safety airbag controller, etc., and further leading to the inability to unlock the door and the inability of the vehicle occupants to escape, which poses certain potential safety hazards and reduces the safety and reliability of the vehicle. Summary of the Utility Model

[0004] The embodiments of the utility model provide a low-voltage power supply and a vehicle power supply system to solve the problem that in the prior art, a low-voltage power supply in a vehicle uniformly powers each load, and the voltage of the low-voltage power supply is pulled down when the load is short-circuited.

[0005] In a first aspect, the embodiments of the utility model provide a low-voltage power supply, including: a supercapacitor module, a first switch, and a DC-DC converter;

[0006] A first end of the supercapacitor module is connected to a first end of the first switch, a second end of the first switch is connected to an output end of the DC-DC converter, and a second end of the supercapacitor module is grounded; the first switch is configured to close when a collision signal is detected;

[0007] An input end of the DC-DC converter is connected to a DC power supply, and the output end of the DC-DC converter is further used to supply power to each load;

[0008] Wherein, the capacity of the supercapacitor module is greater than a preset capacity.

[0009] Optionally, the supercapacitor module includes: a supercapacitor body, a DCDC unit, and a supercapacitor management chip;

[0010] A first end of the supercapacitor body is connected to a first end of the DCDC unit, and a second end of the supercapacitor body forms a second end of the supercapacitor module;

[0011] A second end of the DCDC unit forms a first end of the supercapacitor module; an output end of the supercapacitor management chip is connected to a control end of the first switch.

[0012] Optionally, each load includes: at least one first load and at least one second load; the low-voltage power supply further includes: at least one second switch; wherein, each second switch corresponds to one first load;

[0013] For any one of the second switches, the first end of the second switch is respectively connected to the second end of the first switch, the output end of the DC converter, and the first ends of other second switches, the second end of the second switch is connected to the corresponding first load, and the control end of the second switch is used to receive a short-circuit control signal; the short-circuit control signal is used to control the second switch to disconnect when the first load corresponding to the second switch is short-circuited;

[0014] Each second load is directly connected to the output end of the DC converter.

[0015] Optionally, the low-voltage power supply further includes: at least one short-circuit detection module; wherein, each short-circuit detection module corresponds to one first load and one second switch;

[0016] For any one of the short-circuit detection modules, the short-circuit detection module is used to detect whether the corresponding first load is short-circuited, and send a short-circuit control signal to the control end of the corresponding second switch when a short circuit is detected.

[0017] Optionally, the second switch is a power switch tube.

[0018] Optionally, the first load is a radiator fan;

[0019] The second load is a door lock controller or an airbag controller.

[0020] Optionally, the low-voltage power supply further includes: a plurality of fuses; each fuse corresponds to one load;

[0021] For any one of the fuses, the first end of the fuse is respectively connected to the second end of the first switch, the output end of the DC converter, and the first ends of other fuses, and the second end of the fuse is connected to the corresponding load.

[0022] Optionally, the low-voltage power supply further includes: an energy storage module;

[0023] The positive pole of the energy storage module is respectively connected to the second end of the first switch and the output end of the DC converter, and the negative pole of the energy storage module is grounded.

[0024] Optionally, the energy storage module includes: a storage battery;

[0025] The positive pole of the storage battery forms the positive pole of the energy storage module, and the negative pole of the storage battery forms the negative pole of the energy storage module.

[0026] Second aspect, an embodiment of the present invention provides a vehicle power supply system, including the low-voltage power supply provided in the first aspect of the above embodiment.

[0027] An embodiment of the present invention provides a low-voltage power supply and a vehicle power supply system. The low-voltage power supply includes: a supercapacitor module, a first switch, and a DC converter; a first end of the supercapacitor module is connected to a first end of the first switch, a second end of the first switch is connected to an output end of the DC converter, and a second end of the supercapacitor module is grounded; the first switch is configured to close when a collision signal is detected; an input end of the DC converter is connected to a DC power supply, and the output end of the DC converter is further configured to supply power to each load; wherein, the capacity of the supercapacitor module is greater than a preset capacity. In the embodiment of the present invention, a supercapacitor module is arranged at the output end of the DC converter. When a vehicle collides, the first switch closes and the supercapacitor module is connected. When a load is short-circuited, the supercapacitor module discharges, and the voltage at the output end of the DC converter will not be pulled down in a short time, and some loads that need to maintain power can still be normally powered in a short time when the load is short-circuited. For example, when a collision occurs, the supercapacitor discharges, and the door lock controller still has power in a short time and can normally control the door lock to open, so that the passengers in the vehicle can escape in time, improving the safety and reliability of the vehicle. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 is a schematic circuit structure diagram of a low-voltage power supply provided by an embodiment of the present invention;

[0030] Figure 2 is a schematic circuit structure diagram of another low-voltage power supply provided by an embodiment of the present invention;

[0031] Figure 3 is a schematic circuit structure diagram of an overcurrent detection unit provided by an embodiment of the present invention;

[0032] Figure 4 is a schematic circuit structure diagram of an overvoltage detection unit provided by an embodiment of the present invention;

[0033] Figure 5 is a schematic circuit structure diagram of yet another low-voltage power supply provided by an embodiment of the present invention. Detailed Embodiments

[0034] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below in conjunction with the accompanying drawings in the embodiments of this solution. Obviously, the described embodiments are part of the embodiments of this solution, rather than all of the embodiments. Based on the embodiments in this solution, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this solution.

[0035] The term "including" and any other variations in the description and claims of this solution, as well as in the above-mentioned accompanying drawings, mean "including but not limited to", and are intended to cover non-exclusive inclusion, not limited to the examples listed in the text. In addition, terms such as "first" and "second" are used to distinguish different objects, rather than to describe a specific order.

[0036] The implementation of the present utility model will be described in detail below in conjunction with specific accompanying drawings:

[0037] Figure 1 It is a schematic structural diagram of a low-voltage power supply provided for an embodiment of the present utility model. Refer to Figure 1 , the low-voltage power supply includes: a supercapacitor module 1, a first switch K1, and a DC converter 2;

[0038] The first end of the supercapacitor module 1 is connected to the first end of the first switch K1, the second end of the first switch K1 is connected to the output end of the DC converter 2, and the second end of the supercapacitor module 1 is grounded; the first switch K1 is configured to close when a collision signal is detected;

[0039] The input end of the DC converter 2 is connected to a DC power supply, and the output end of the DC converter 2 is also used to supply power to each load;

[0040] Among them, the capacity of the supercapacitor module 1 is greater than a preset capacity.

[0041] A capacitor is an energy storage component. There is a direct relationship between the capacitor voltage and energy. Since energy cannot change abruptly, the capacitor voltage cannot change abruptly either. Based on this, in the embodiments of the present invention, a supercapacitor module 1 is provided at the output end of the DC converter 2. When a collision occurs, the airbag controller sends a collision signal. When the collision signal is detected, the first switch K1 closes, and the supercapacitor module 1 is connected. When one or more loads are short-circuited, due to the presence of the supercapacitor module 1, the supercapacitor module 1 discharges, and the voltage at the output end of the DC converter 2 will not be quickly pulled down and can still normally supply power to other loads within a short period of time, improving the power supply stability. For example, when a vehicle collides and the radiator fan is short-circuited, the supercapacitor module 1 is connected and discharges, and the output end of the DC converter 2 can still normally supply power to the door lock controller, enabling the door lock to be normally unlocked and allowing the passengers to escape smoothly, improving the safety and reliability of the vehicle. At the same time, the capacity of the supercapacitor module 1 is greater than the preset capacity to ensure its discharge duration and ensure that the door lock can be normally unlocked.

[0042] Exemplarily, the DC converter 2 can be a DCDC.

[0043] In a possible implementation manner, referring to Figure 1 , the supercapacitor module 1 can include: a supercapacitor body C1, a DCDC unit 11, and a supercapacitor management chip 12;

[0044] The first end of the supercapacitor body C1 is connected to the first end of the DCDC unit 11, and the second end of the supercapacitor body C1 forms the second end of the supercapacitor module 1;

[0045] The second end of the DCDC unit 11 forms the first end of the supercapacitor module 1;

[0046] The output end of the supercapacitor management chip 12 is connected to the control end of the first switch K1.

[0047] The supercapacitor management chip 12 is used to detect the collision signal and control the first switch K1 to close when the collision signal is detected, so that the supercapacitor module 1 is connected. At the same time, the supercapacitor management chip 12 is also used to manage the electric energy of the supercapacitor body C1. When the power of the supercapacitor body C1 is low, it controls the first switch K1 to close to charge the supercapacitor body C1; when the supercapacitor body C1 is full, it controls the first switch K1 to open. The DCDC unit 11 is used to perform voltage conversion when the supercapacitor body C1 is charging and discharging.

[0048] Among them, the control logic of the first switch K1 includes but is not limited to the above, which is a conventional technical means in the art. This application only protects the hardware circuit and does not protect this control logic, which is not the inventive point of this application.

[0049] In a possible implementation manner, refer to Figure 2 , each load may include: at least one first load and at least one second load; the low-voltage power supply may further include: at least one second switch K2; wherein, each second switch K2 corresponds to one first load;

[0050] For any one second switch K2, the first end of the second switch K2 is respectively connected to the second end of the first switch K1, the output end of the DC converter 2, and the first ends of other second switches K2. The second end of the second switch K2 is connected to the corresponding first load, and the control end of the second switch K2 is used to receive a short-circuit control signal; the short-circuit control signal is used to control the second switch K2 to turn off when the first load corresponding to the second switch K2 is short-circuited.

[0051] Each second load is directly connected to the output end of the DC converter 2.

[0052] In the embodiment of the present utility model, the loads are also classified. For some loads in the vehicle that are prone to short circuits, they are defined as first loads, for example, radiator fans, etc.; other loads that need to ensure power supply can be defined as second loads, for example, airbag controllers and body controllers, etc. For each first load that is prone to short circuits, a second switch K2 is arranged in the path of each first load, which is used to timely cut off the corresponding first load when a short circuit occurs. On the basis of the short-term voltage stabilization of the supercapacitor module 1, the short-circuit load is further fundamentally cut off, ensuring the stability of the output voltage of the DC converter 2 and guaranteeing the continuity of power supply for each second load, and further improving the safety and stability of the vehicle.

[0053] In a possible implementation manner, the low-voltage power supply may further include: at least one short-circuit detection module 3; wherein, each short-circuit detection module 3 corresponds to one first load and one second switch K2;

[0054] For any one short-circuit detection module 3, the short-circuit detection module 3 is used to detect whether the corresponding first load is short-circuited, and send a short-circuit control signal to the control end of the corresponding second switch K2 when a short circuit is detected.

[0055] In the embodiment of the present utility model, a short-circuit detection module 3 is arranged corresponding to each first load, which is used to detect whether the corresponding first load is short-circuited, and further control the on-off of the second switch K2 to cut off the short-circuit load.

[0056] In a possible implementation manner, refer to Figure 3 , the short-circuit detection module 3 may include: an overcurrent detection unit 31; the overcurrent detection unit 31 is configured to detect whether the current flowing through the corresponding second switch K2 is overcurrent, and output different voltage values through the output end of the overcurrent detection unit 31 to indicate whether it is overcurrent.

[0057] More specifically, referring to Figure 3 , the overcurrent detection unit 31 may include: a current sensor 311, a voltage dividing subunit 312, a follower subunit 313, and a first comparison subunit 314;

[0058] The current sensor 311 is disposed in the path where the corresponding second switch K2 of the overcurrent detection unit 31 is located, and is used to detect the current flowing through the second switch K2;

[0059] The input end of the voltage dividing subunit 312 is connected to the voltage output end of the current sensor 311, and the output end of the voltage dividing subunit 312 is connected to the input end of the follower subunit 313;

[0060] The output end of the follower subunit 313 is connected to the first input end of the first comparison subunit 314. The second input end of the first comparison subunit 314 is used to input a first reference voltage VREF1, and the output end of the first comparison subunit 314 forms the output end of the overcurrent detection unit 31.

[0061] The current sensor 311 is disposed in the path where the corresponding second switch K2 is located, detects the current flowing through the second switch K2, and converts it into a voltage signal for output; the voltage dividing subunit 312 is used to divide the voltage signal output by the current sensor 311 to meet the device voltage requirements; the follower subunit 313 is used for buffering, isolation, reducing the output impedance, reducing the current consumption, and reducing the influence of the access of the overcurrent detection unit 31 on the power supply path of the DC converter 2; the first comparison subunit 314 is used for voltage comparison and outputs an overcurrent detection result. When the current flowing through the second switch K2 is less than the preset current, the first comparison subunit 314 outputs a first level, which is used to indicate that there is no overcurrent; when the current flowing through the second switch K2 is not less than the preset current, the first comparison subunit 314 outputs a second level, which is used to indicate that there is an overcurrent.

[0062] Among them, the magnitude of the preset current can be set according to actual application requirements, and is not specifically limited here. Specifically, the magnitude of the preset current can be adjusted by adjusting the first reference voltage VREF1.

[0063] Exemplarily, those skilled in the art should be clear that the above low-voltage power supply should also include a control module, which can specifically be a separate control chip or can reuse the vehicle controller. The control module detects the voltage signals at the output ends of the respective overcurrent detection units 31, and determines whether each first load is short-circuited according to the voltage signals. When it is detected that a certain first load is short-circuited, the corresponding second switch K2 is controlled to disconnect, and the short-circuited first load is cut off.

[0064] For another example, the control module also detects the collision signal sent by the airbag controller, and only controls the corresponding second switch K2 to disconnect when the collision signal is detected and a certain first load is detected to be short-circuited at the same time.

[0065] The control logic of the second switch K2 includes but is not limited to the above, and can be specifically set according to actual application requirements. This is a conventional technical means in the art. This application only protects the hardware circuit and does not protect this control logic, which is not the inventive point of this application.

[0066] In another possible implementation, referring to Figure 4 , the short-circuit detection module 3 may include: an overvoltage detection unit 32. The overvoltage detection unit 32 is configured to detect whether the voltage difference across the corresponding second switch K2 is overvoltage, and output different voltage values through the output terminal of the overvoltage detection unit 32 to indicate whether it is overvoltage.

[0067] When a certain first load is short-circuited, the voltage at the first load end will be quickly pulled down, and a large voltage difference will be generated across the second switch K2. Based on this, an overvoltage detection unit 32 is provided for each second switch K2 to detect whether the voltage difference across the second switch K2 is overvoltage, so as to determine whether the corresponding first load is short-circuited.

[0068] More specifically, the overvoltage detection unit 32 may include: a differential amplification subunit 321 and a second comparison subunit 322;

[0069] The first input terminal of the differential amplification subunit 321 is connected to the first end of the corresponding second switch K2, the second input terminal of the differential amplification subunit 321 is connected to the second end of the corresponding second switch K2, and the output terminal of the differential amplification subunit 321 is connected to the first input terminal of the second comparison subunit 322;

[0070] The second input terminal of the second comparison subunit 322 is used to input a second reference voltage VREF2, and the output terminal of the second comparison subunit 322 forms the output terminal of the overvoltage detection unit 32.

[0071] The differential amplification subunit 321 is used to obtain and amplify the voltage difference across the second switch K2; the second comparison subunit 322 is also used for voltage comparison and outputs an overvoltage detection result; when the voltage difference across the second switch K2 is less than the second preset voltage, the second comparison subunit 322 outputs a third level to indicate that there is no overvoltage; when the voltage difference across the second switch K2 is not less than the second preset voltage, the second comparison subunit 322 outputs a fourth level to indicate that there is overvoltage.

[0072] Exemplarily, the control module detects the voltage signals at the output ends of the respective overvoltage detection units 32, and determines whether each second switch K2 is overvoltage based on the voltage signals. When it is detected that a certain second switch K2 is overvoltage, it indicates that the corresponding first load may be short-circuited, and the corresponding second switch K2 is controlled to open to cut off the short-circuited first load.

[0073] For another example, the control module also detects the collision signals sent by the above-mentioned airbag controller. When a collision signal is detected and at the same time it is detected that a certain second switch K2 is overvoltage, the corresponding second switch K2 is controlled to open.

[0074] In a further embodiment, the short-circuit detection module 3 may include: an overcurrent detection unit 31 and an overvoltage detection unit 32; the specific circuits of the overcurrent detection unit 31 and the overvoltage detection unit 32 are the same as above, and are respectively used to detect overcurrent and overvoltage.

[0075] Exemplarily, the control module can simultaneously obtain the collision signals, the voltage signals at the output ends of the respective overcurrent detection units 31, and the voltage signals at the output ends of the respective overvoltage detection units 32, and comprehensively judge to control each second switch K2.

[0076] For example, for any one second switch K2, when a collision signal is detected and at the same time overvoltage and overcurrent are detected, the second switch K2 is controlled to close. Or for any one switch, as long as it is detected that any two of the above conditions are met, the second switch K2 is controlled to close.

[0077] It should be noted that the control logic of the second switch K2 includes but is not limited to the above several types, which are conventional technical means in the art. This application only protects the hardware circuit and does not protect this control logic, which is not the inventive point of this application.

[0078] More specifically, the voltage dividing sub-unit 312 can use resistor voltage division, the first comparison sub-unit 314 and the second comparison sub-unit 322 can both be implemented by a hysteresis comparator, and the follower sub-unit 313 and the differential amplification sub-unit 321 can both be implemented by a comparator. The specific circuits of the above respective sub-units are conventional technical means in the art and will not be elaborated here.

[0079] In a possible embodiment, referring to Figure 5 , the second switch K2 can be a power switch tube.

[0080] The power switch tube has a fast switching speed and can quickly cut off the short-circuited load when a short circuit occurs. For example, the second switch K2 can be an NMOS.

[0081] Similarly, the first switch K1 can also be a power switch tube, specifically an NMOS.

[0082] In a possible embodiment, referring toFigure 5 , the first load can be a radiator fan;

[0083] The second load can be a door lock controller or an airbag controller.

[0084] The radiator fan is extremely prone to short - circuit during a collision, so it is classified as the first load to facilitate timely disconnection in case of a short - circuit; the door lock controller and the airbag controller can be classified as the second load, and their power supply needs to be ensured. The first load and the second load can also be other loads in the vehicle cabin.

[0085] Specifically, referring to Figure 5 , the door lock controller can be a body controller. When a collision occurs, the airbag controller sends a collision signal, the first switch K1 conducts, the super - capacitor module 1 discharges and stabilizes the voltage, the body controller is normally powered, controls the door lock to open, and the passengers in the vehicle can escape smoothly. At the same time, if a short - circuit of the radiator fan is detected, the corresponding second switch K2 is controlled to disconnect, cutting off the radiator fan, ensuring the power supply of the body controller and the airbag controller.

[0086] In a possible implementation manner, referring to Figure 1 , the low - voltage power supply can also include: a plurality of fuses FU1; each fuse FU1 corresponds to one load;

[0087] For any one fuse FU1, the first end of the fuse FU1 is respectively connected to the second end of the first switch K1, the output end of the DC - DC converter 2, and the first ends of other fuses FU1, and the second end of the fuse FU1 is connected to the corresponding load.

[0088] In the embodiment of the present utility model, fuses FU1 can be arranged in the paths of each load. The fuses FU1 automatically blow when over - current occurs, ensuring the safety of the circuit.

[0089] In a possible implementation manner, referring to Figure 1 , the low - voltage power supply can also include: an energy storage module 4;

[0090] The positive pole of the energy storage module 4 is respectively connected to the second end of the first switch K1 and the output end of the DC - DC converter 2, and the negative pole of the energy storage module 4 is grounded.

[0091] In the embodiment of the present utility model, an energy storage module 4 is also provided. When the DC - DC converter 2 fails, the energy storage module 4 can supply power to each load to ensure the stable power supply of each load.

[0092] In a possible implementation manner, the energy storage module 4 can include: a storage battery;

[0093] The positive pole of the storage battery forms the positive pole of the energy storage module 4, and the negative pole of the storage battery forms the negative pole of the energy storage module 4.

[0094] Corresponding to the above embodiments, the embodiment of the present utility model further provides a vehicle power supply system, which includes the low-voltage power supply provided in any one of the above embodiments, and has the advantages of any one of the above low-voltage power supplies, and details are not described herein again.

[0095] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A low-voltage power supply, characterized in that, Comprising: A supercapacitor module, a first switch, and a DC-DC converter; A first end of the supercapacitor module is connected to a first end of the first switch, a second end of the first switch is connected to an output end of the DC-DC converter, and a second end of the supercapacitor module is grounded; the first switch is configured to close when a collision signal is detected; An input end of the DC-DC converter is connected to a DC power supply, and the output end of the DC-DC converter is further configured to supply power to each load; Wherein, the capacity of the supercapacitor module is greater than a preset capacity.

2. The low-voltage power supply according to claim 1, wherein The supercapacitor module includes: a supercapacitor body, a DC-DC unit, and a supercapacitor management chip; A first end of the supercapacitor body is connected to a first end of the DC-DC unit, and a second end of the supercapacitor body forms the second end of the supercapacitor module; A second end of the DC-DC unit forms the first end of the supercapacitor module; an output end of the supercapacitor management chip is connected to a control end of the first switch.

3. The low-voltage power supply according to claim 1, characterized in that, Each load includes: at least one first load and at least one second load; the low-voltage power supply further includes: at least one second switch; wherein, each second switch corresponds to one first load; For any one of the second switches, a first end of the second switch is respectively connected to a second end of the first switch, an output end of the DC-DC converter, and a first end of other second switches, a second end of the second switch is connected to the corresponding first load, and a control end of the second switch is configured to receive a short-circuit control signal; the short-circuit control signal is configured to control the second switch to open when the first load corresponding to the second switch is short-circuited; Each of the second loads is directly connected to the output end of the DC-DC converter.

4. The low-voltage power supply according to claim 3, wherein, The low-voltage power supply further includes: at least one short-circuit detection module; wherein, each short-circuit detection module corresponds to one first load and one second switch; For any one of the short-circuit detection modules, the short-circuit detection module is configured to detect whether the corresponding first load is short-circuited, and send the short-circuit control signal to the control end of the corresponding second switch when a short circuit is detected.

5. The low-voltage power supply according to claim 3, characterized in that, The second switch is a power switch tube.

6. The low-voltage power supply according to claim 3, characterized in that, The first load is a radiator fan; The second load is a door lock controller or an airbag controller.

7. The low-voltage power supply according to claim 1, characterized in that, The low-voltage power supply further includes: a plurality of fuses; each fuse corresponds to one load; For any one of the fuses, a first end of the fuse is respectively connected to a second end of the first switch, an output end of the DC-DC converter, and a first end of other fuses, and a second end of the fuse is connected to the corresponding load.

8. The low-voltage power supply according to any one of claims 1 to 7, characterized in that The low-voltage power supply further includes: an energy storage module; A positive electrode of the energy storage module is respectively connected to a second end of the first switch and an output end of the DC-DC converter, and a negative electrode of the energy storage module is grounded.

9. The low-voltage power supply according to claim 8, wherein, The energy storage module includes: a storage battery; A positive electrode of the storage battery forms the positive electrode of the energy storage module, and a negative electrode of the storage battery forms the negative electrode of the energy storage module.

10. A vehicle power supply system, characterized in that, Including the low-voltage power supply according to any one of claims 1 to 9.

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