Energy supporting device and low-voltage power distribution system

Abstract

The utility model discloses an energy support device, comprising a capacitor; the low-voltage power supply is used for supplying power to a load; the switch assembly is arranged between the low-voltage power supply and the capacitor, and the switch assembly can be switched between a first state and a second state; the first control part is arranged between the low-voltage power supply and the switch assembly and is used for controlling the switch assembly to be switched to the first state; the second control part is arranged between the capacitor and the switch assembly and is used for controlling the switch assembly to be switched to the second state; in the first state, the output voltage of the low-voltage power supply is lower than the rated voltage of the load, and the current of the capacitor flows into the low-voltage power supply through the switch assembly, and in the second state, the capacitor no longer releases electric energy, and the current of the low-voltage power supply flows into the capacitor through the switch assembly. According to the utility model, energy support can be provided for the low-voltage power supply, so that the low-voltage power supply can stably output a voltage value meeting load requirements. The utility model also provides a low-voltage power distribution system.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage systems, and particularly to an energy support device and a low-voltage power distribution system. Background Art

[0002] In-vehicle electrical devices such as the information entertainment system, electric door lock, and electric window of a vehicle are all powered by a low-voltage power supply. If a high-voltage system is used for in-vehicle electrical devices of a vehicle, serious safety problems will occur. Once the vehicle collides, if the driver touches a short-circuited high-voltage system, great danger will occur.

[0003] With the increase in the electrical appliances of the low-voltage power distribution system, the load demand for the low-voltage power supply is greater. Moreover, electrical devices such as the power steering motor have relatively high requirements for the instantaneous energy supply of the low-voltage power supply. If only the low-voltage power supply provides energy for in-vehicle electrical devices, it is easy to cause the output voltage of the low-voltage power supply to be unstable, resulting in a situation where the output voltage is lower than the rated voltage of the in-vehicle electrical device, and further causing the in-vehicle electrical device to fail due to undervoltage. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the technical problem of unstable output voltage of the low-voltage power supply. The utility model provides an energy support device, which can provide energy support for the low-voltage power supply, so that the low-voltage power supply can stably output a voltage value that meets the load demand.

[0005] To solve the above technical problem, an embodiment of the utility model discloses an energy support device, including:

[0006] A capacitor;

[0007] A low-voltage power supply for supplying power to a load;

[0008] A switch assembly, which is arranged between the low-voltage power supply and the capacitor, and the switch assembly can switch between a first state and a second state;

[0009] A first control unit, which is arranged between the low-voltage power supply and the switch assembly, and is used to control the switch assembly to switch to the first state;

[0010] A second control unit, which is arranged between the capacitor and the switch assembly, and is used to control the switch assembly to switch to the second state;

[0011] In the first state, the output voltage of the low-voltage power supply is lower than the rated voltage of the load, and the current of the capacitor flows through the switch assembly into the low-voltage power supply. In the second state, the capacitor no longer releases electric energy, and the current of the low-voltage power supply flows through the switch assembly into the capacitor.

[0012] With the above technical solution, in the first state, when the output voltage of the low-voltage power supply is lower than the rated voltage of the load (such as in-vehicle electrical equipment), the first control unit can control the switch assembly to conduct, so that the current stored in the capacitor flows into the low-voltage power supply, thereby preventing the output voltage of the low-voltage power supply from being lower than the rated voltage of the in-vehicle electrical equipment; in the second state, when the capacitor no longer releases electrical energy, that is, when the electrical energy stored in the capacitor is exhausted, the second control unit can control the switch assembly to conduct, so that the low-voltage power supply charges the capacitor. In this way, the low-voltage power supply can stably output electrical energy that meets the rated voltage requirements of the load.

[0013] According to another specific embodiment of the present invention, an energy support device is disclosed in the embodiment of the present invention. The switch assembly includes:

[0014] An inductance coil, which is arranged between the first control unit and the second control unit:

[0015] A first switch and a second switch, both the first switch and the second switch are connected to the first control unit, and the first connection end of the inductance coil is arranged between the first switch and the second switch;

[0016] A third switch and a fourth switch, both the third switch and the fourth switch are connected to the second control unit, and the second connection end of the inductance coil is arranged between the third switch and the fourth switch;

[0017] In the first state, the first switch and the fourth switch are closed, the second switch and the third switch are open, and the current of the capacitor flows through the fourth switch, the inductance coil, and the first switch in sequence and finally flows into the low-voltage power supply.

[0018] With the above technical solution, the first control unit closes the first switch and opens the second switch, and the second control unit closes the fourth switch. The currents of the capacitor and the inductance coil are connected in series and then input into the low-voltage power supply to obtain the rated voltage value of the load.

[0019] According to another specific embodiment of the present invention, an energy support device is disclosed in the embodiment of the present invention. The second switch and the third switch are grounded. The inductance coil includes a first charging state and a first discharging state. In the first charging state, the first control unit opens the first switch and closes the second switch, and the second control unit opens the third switch and closes the fourth switch, and the current flows from the capacitor into the inductance coil; when the inductance coil is in the first discharging state, the switch assembly is in the first state.

[0020] With the above technical solution, the first control unit disconnects the first switch and closes the second switch, and the second control unit disconnects the third switch and closes the fourth switch, so that the current flows from the capacitor into the inductor coil. In this way, when the voltage of the capacitor fails to reach the rated voltage required by the load, the voltage of the inductor coil can be superimposed to achieve step-up charging.

[0021] According to another specific embodiment of the present invention, an energy support device is disclosed in the embodiment of the present invention. The inductor coil includes a second charging state and a second discharging state. The second state includes a first sub-state and a second sub-state. In the first sub-state, the inductor coil is in the second charging state. The first control unit closes the first switch and disconnects the second switch, and the second control unit closes the third switch and disconnects the fourth switch, and the current flows from the low-voltage power supply into the inductor coil.

[0022] In the second sub-state, the inductor coil is in the second discharging state. The first control unit disconnects the first switch and closes the second switch, and the second control unit closes the fourth switch and disconnects the third switch, and the current flows from the inductor coil into the capacitor.

[0023] With the above technical solution, the current of the low-voltage power supply can flow into the capacitor via the switch assembly through the first sub-state and the second sub-state to quickly charge the capacitor. When the voltage of the low-voltage power supply is greater than the voltage of the capacitor, the capacitor can be charged only by using the inductor coil, which can avoid damage to the capacitor caused by directly using the low-voltage power supply to charge the capacitor, that is, it is equivalent to step-down the voltage output by the low-voltage power supply and then charge the capacitor.

[0024] According to another specific embodiment of the present invention, an energy support device is disclosed in the embodiment of the present invention. The first control unit includes a first single-chip microcomputer and a first driving chip. The first single-chip microcomputer and the first driving chip are connected in series. The first single-chip microcomputer is used to monitor the output voltage value of the low-voltage power supply, and the first driving chip is used to control the first switch and / or the second switch to be closed or opened.

[0025] According to another specific embodiment of the present invention, an energy support device is disclosed in the embodiment of the present invention. The second control unit includes a second single-chip microcomputer and a second driving chip. The second single-chip microcomputer and the second driving chip are connected in series. The second single-chip microcomputer is used to monitor the output current value of the capacitor, and the second driving chip is used to control the third switch and / or the fourth switch to be closed or opened.

[0026] With the above technical solution, the switch assembly can be controlled to switch to different states in a timely manner according to the current changes of the capacitor or the low-voltage power supply, improving the working efficiency.

[0027] According to another specific embodiment of the present utility model, an energy support device is disclosed in the embodiment of the present utility model. The capacitor includes a plurality of capacitors connected in series in sequence.

[0028] According to another specific embodiment of the present utility model, an energy support device is disclosed in the embodiment of the present utility model. The first switch, the second switch, the third switch, and the fourth switch are all MOS transistors.

[0029] By adopting the above technical solution, the cost of this solution can be reduced.

[0030] The embodiment of the present utility model also discloses a low-voltage power distribution system. The low-voltage power distribution system at least includes the energy support device in any one of the above embodiments. The low-voltage power distribution system further includes a load, and the load is connected to the low-voltage power supply of the energy support device.

[0031] According to another specific embodiment of the present utility model, an energy support device is disclosed in the embodiment of the present utility model. The load includes an assist motor.

[0032] By adopting the above technical solution, the stability of the low-voltage power distribution system can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagrams of low-voltage power distribution systems in some embodiments are shown.

[0034] Figure 2 Schematic diagrams of low-voltage power distribution systems provided in the embodiments of the present application are shown.

[0035] Figure 3 Simplified schematic diagrams of energy support devices provided in the embodiments of the present application are shown.

[0036] Figure 4 Schematic diagrams of switch assemblies of energy support devices provided in the embodiments of the present application are shown.

[0037] Figure 5 Circuit schematic diagrams of energy support devices provided in the embodiments of the present application are shown

[0038] Figure 6 Schematic diagrams of capacitors of energy support devices provided in the embodiments of the present application are shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Although the description of the present utility model will be introduced in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this implementation manner. On the contrary, the purpose of introducing the utility model in conjunction with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present utility model. In order to provide a deep understanding of the present utility model, many specific details will be included in the following description. The present utility model can also be implemented without using these details. In addition, in order to avoid confusing or obscuring the key points of the present utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0040] It should be noted that in this specification, similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0041] In the description of this embodiment, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0042] The terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0043] In the description of this embodiment, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific situations.

[0044] To make the purpose, technical solution and advantages of the present utility model clearer, the implementation manners of the present utility model will be further described in detail below with reference to the drawings.

[0045] In some embodiments, refer to Figure 1, the low - voltage power distribution system does not include an energy support device and only has a low - voltage power source and loads. Among them, the low - voltage power source is connected to multiple loads such as load 1, load 2, etc. As the number of loads increases, the current demand of the loads is large. When the load current increases, it is easy to cause the output voltage of the low - voltage power source to be pulled down short - term, damaging the electrical loads.

[0046] In some embodiments, referring to Figure 2 、 Figure 3 , the present application provides a low - voltage power distribution system, including an energy support device 10 and a load 20. The load 20 is connected to the low - voltage power source 11 of the energy support device 10. Exemplarily, the load 20 may include an assist motor. It can be understood that the load 20 may also be an active steering device of a vehicle, etc. The present application does not limit this. When the output voltage of the low - voltage power source 11 is pulled down short - term, the energy support device 10 can provide stable electrical energy support for the low - voltage power source 11 to ensure that the output voltage of the low - voltage power source 11 can meet the requirements of the load 20.

[0047] In some embodiments, the energy support device 10 includes a low - voltage power source 11, a capacitor 12, a switch assembly 13, a first control unit 14, and a second control unit 15. Among them, the low - voltage power source 11 is used to supply power to the load 20; the switch assembly 13 is disposed between the low - voltage power source 11 and the capacitor 12, and the switch assembly 13 can switch between a first state and a second state; the first control unit 14 is disposed between the low - voltage power source 11 and the switch assembly 13 and is used to control the switch assembly 13 to switch to the first state; the second control unit 15 is disposed between the capacitor 12 and the switch assembly 13 and is used to control the switch assembly 13 to switch to the second state.

[0048] In the first state, the output voltage of the low - voltage power source 11 is lower than the rated voltage of the load 20, and the current of the capacitor 12 flows into the low - voltage power source 11 through the switch assembly 13. In the second state, the capacitor 12 no longer releases electrical energy, and the current of the low - voltage power source 11 flows into the capacitor 12 through the switch assembly 13. Exemplarily, the inductance of the inductor coil can be selected as 2.8 μH. It can be understood that the present application does not limit the inductance of the inductor coil. For example, inductor coils with inductances of 1 μH, 2 μH, 3 μH, 3.5 μH, 4.8 μH, etc. can be selected.

[0049] In some embodiments, referring to Figure 2 、 Figure 3 、 Figure 4 , Figure 4The medium-voltage battery (low-voltage battery), i.e., the low-voltage power supply 11, and the switch assembly 13 includes an inductance coil 131 which is disposed between the first control unit 14 and the second control unit 15. In addition, the switch assembly 13 further includes a first switch 132, a second switch 133, a third switch 134, and a fourth switch 135. Both the first switch 132 and the second switch 133 are connected to the first control unit 14, and both the third switch 134 and the fourth switch 135 are connected to the second control unit 15. The first connection end 1311 of the inductance coil 131 is disposed between the first switch 132 and the second switch 133, and the second connection end 1312 of the inductance coil 131 is disposed between the third switch 134 and the fourth switch 135.

[0050] In the first state, the first switch 132 and the fourth switch 135 are closed, and the second switch 133 and the third switch 134 are open. The current of the capacitor 12 sequentially flows through the fourth switch 135, the inductance coil 131, and the first switch 132 and finally flows into the low-voltage power supply 11.

[0051] By adopting the above technical solution, when the first control unit 14 closes the first switch 132 and opens the second switch 133, and the second control unit 15 closes the fourth switch 135, the current of the capacitor 12 and the inductance coil 131 sequentially flows through the fourth switch 135, the inductance coil 131, and the first switch 132 and finally flows into the low-voltage power supply 11. By connecting the current of the capacitor 12 and the inductance coil 131 in series and inputting them into the low-voltage power supply 11, the rated voltage value of the load can be obtained.

[0052] In some embodiments, the second switch 133 and the third switch 134 are grounded. The inductance coil 131 includes a first charging state and a first discharging state. In the first charging state, the first control unit 14 opens the first switch 132 and closes the second switch 133, and the second control unit 15 opens the third switch 134 and closes the fourth switch 135, and the current flows from the capacitor 12 into the inductance coil 131. When the inductance coil 131 is in the first discharging state, the switch assembly 13 is in the first state. Exemplarily, the second switch 133 and the third switch 134 have a common grounding end 1331.

[0053] Exemplarily, the inductance coil 131 further includes a first discharging state. After the inductance coil 131 is fully charged, the first control unit 14 closes the first switch 132 and opens the second switch 133, and the second control unit 15 closes the fourth switch 135 and opens the third switch 134. At this time, the current of the capacitor 12 and the current of the inductance coil 131 are connected in series and input into the low-voltage power supply 11 to obtain the rated voltage value of the load 20.

[0054] Exemplarily, the output voltage of the low-voltage power supply 11 is 12V, the voltage value of the current output by the capacitor 12 is 8V. When the inductor coil 131 is in the first charging state, the first control unit 14 opens the first switch 132 and closes the second switch 133, and the second control unit 15 opens the third switch 134 and closes the fourth switch 135. The current flows from the capacitor 12 into the inductor coil 131 to charge the inductor coil 131 so that the inductor coil 131 can output a current with a voltage value of 4V. When the output voltage of the low-voltage power supply 11 is short-time pulled down due to reasons such as an increase in the load 20, the inductor coil 131 is in the first discharging state. The first control unit 14 closes the first switch 132 and opens the second switch 133, and the second control unit 15 closes the fourth switch 135. The 8V current output by the capacitor 12 and the 4V current output by the inductor coil 131 are connected in series to obtain a 12V current and input it into the low-voltage power supply 11 to provide energy support for the low-voltage power supply 11 so that the low-voltage power supply 11 can stably output a voltage of 12V.

[0055] It can be understood that the present application does not limit the output voltage of the low-voltage power supply 11. For example, it can also be a voltage value such as 48V. The present application also does not limit the voltage values of the output currents of the capacitor 12 and the inductor coil 131. Specifically, different capacitors 12 and inductor coils 131 can be selected according to actual needs.

[0056] In some embodiments, the inductor coil 131 includes a second charging state and a second discharging state. The second state includes a first sub-state and a second sub-state. In the first sub-state, the inductor coil 131 is in the second charging state. The first control unit 14 closes the first switch 132 and opens the second switch 133, and the second control unit 15 closes the third switch 134 and opens the fourth switch 135. The current flows from the low-voltage power supply 11 into the inductor coil 131. In the second sub-state, the inductor coil 131 is in the second discharging state. The first control unit 14 opens the first switch 132 and closes the second switch 133, and the second control unit 15 closes the fourth switch 135 and opens the third switch 134. The current flows from the inductor coil 131 into the capacitor 12 to quickly charge the capacitor 12.

[0057] In some embodiments, refer to Figure 5 、 Figure 6, the capacitor 12 includes a plurality of capacitors 12 arranged in series in sequence. Exemplarily, the capacitor 12 includes a first capacitor 121, a second capacitor 122, a third capacitor 123, and a fourth capacitor 124 arranged in series, wherein one end of the fourth capacitor 124 is grounded, and the voltage value of the output current of each capacitor is 2V. It can be understood that the present application does not limit the number of capacitors 12. For example, the number of capacitors 12 can also be 1, 2, 3, 5, 6, 7, etc. In some embodiments, the capacitor can also be a hybrid ultra-capacitor HUC (Hybrid Ultra Capacitor).

[0058] In some embodiments, the first switch 132, the second switch 133, the third switch 134, and the fourth switch 135 are all MOS transistors (Metal Oxide Semiconductor Field Effect Transistor). It can be understood that the present application does not limit the types of the first switch 132, the second switch 133, the third switch 134, and the fourth switch 135. For example, other components such as triodes and IGBTs (Insulated Gate Bipolar Transistor) can also be used.

[0059] In some embodiments, the first control unit 14 includes a first single-chip microcomputer 141 and a first driver chip 142. The first single-chip microcomputer 141 and the first driver chip 142 are connected in series. The first single-chip microcomputer 141 is used to monitor the output voltage value of the low-voltage power supply 11, and the first driver chip 142 is used to control the first switch 132 to be turned off or on, or the first driver chip 142 is used to control the second switch 133 to be turned off or on, or the first driver chip 142 is used to control the first switch 132 and the second switch 133 to be turned off or on.

[0060] In some embodiments, the second control unit 15 includes a second single-chip microcomputer 151 and a second driver chip 152. The second single-chip microcomputer 151 and the second driver chip 152 are connected in series. The second single-chip microcomputer 151 is used to monitor the output current value of the capacitor 12, and the second driver chip 152 is used to control the third switch 134 to be turned off or on. Alternatively, the first driver chip 142 is used to control the fourth switch 135 to be turned off or on. Alternatively, the first driver chip 142 is used to control the third switch 134 and the fourth switch 135 to be turned off or on. Exemplarily, both the first driver chip 142 and the second driver chip 152 are gate driver chips (GDUs, Gate Driver Units), which are used to control the switching actions of power semiconductor devices (such as MOSFETs, IGBTs, etc.). The first single-chip microcomputer 141 and the second single-chip microcomputer 151 can be 51 single-chip microcomputers, ARM single-chip microcomputers (Advanced RISC Machines), etc., and the present application does not limit this. In addition, it can be understood that a single-chip microcomputer is also called a microcontroller unit (MCU).

[0061] In some embodiments, referring to Figure 5 , the first single-chip microcomputer 141 includes a first pin 1411 and a second pin 1412. After the first pin 1411 is led out from the first single-chip microcomputer 141, it is connected between the first switch 132 and the low-voltage power supply 11, and is used to monitor the voltage value or current value of the low-voltage power supply 11; the second pin 1412 is connected to the first driver chip 142 and is used to output a PWM (Pulse Width Modulation) signal, so that the first driver chip 142 can control the first switch 132 and the second switch 133 to be turned on or off respectively. The second single-chip microcomputer 151 includes a third pin 1511 and a fourth pin 1512. After the third pin 1511 is led out from the second single-chip microcomputer 151, it is connected between the fourth switch 135 and the capacitor 12, and is used to monitor the voltage value or current value of the capacitor 12; the fourth pin 1512 is connected to the second driver chip 152 and is used to output a PWM signal, so that the second driver chip 152 can control the third switch 134 and the fourth switch 135 to be turned on or off respectively.

[0062] Although the present invention has been illustrated and described by referring to some preferred embodiments of the present invention, those of ordinary skill in the art should understand that the above content is a further detailed description of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. Those skilled in the art can make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. An energy support device, characterized in that: include: capacitance; A low voltage power supply for supplying power to the load; A switch component, the switch component is arranged between the low-voltage power supply and the capacitor, and the switch component can be switched between a first state and a second state; A first control unit, the first control unit is arranged between the low-voltage power supply and the switch component, and is used to control the switch component to switch to the first state; A second control unit, the second control unit is disposed between the capacitor and the switch component, and is used to control the switch component to switch to the second state; In the first state, the output voltage of the low-voltage power supply is lower than the rated voltage of the load, and the current of the capacitor flows into the low-voltage power supply through the switch component. In the second state, the capacitor no longer releases electrical energy, and the current of the low-voltage power supply flows into the capacitor through the switch component.

2. The energy support device according to claim 1, characterized in that: The switch assembly comprises: An inductor, wherein the inductor is disposed between the first control unit and the second control unit: A first switch and a second switch, wherein the first switch and the second switch are both connected to the first control unit, and the first connection end of the inductor is arranged between the first switch and the second switch; a third switch and a fourth switch, wherein the third switch and the fourth switch are both connected to the second control unit, and the second connection end of the inductor is arranged between the third switch and the fourth switch; In the first state, the first switch and the fourth switch are closed, the second switch and the third switch are opened, and the current of the capacitor flows sequentially through the fourth switch, the inductor, the first switch, and finally flows into the low-voltage power supply.

3. The energy support device according to claim 2, characterized in that: The second switch and the third switch are grounded, and the inductor includes a first charging state and a first discharging state. In the first charging state, the first control unit opens the first switch and closes the second switch, and the second control unit opens the third switch and closes the fourth switch, and the current flows from the capacitor into the inductor; when the inductor is in the first discharging state, the switch component is in the first state.

4. The energy support device according to claim 3, characterized in that: The inductor includes a second charging state and a second discharging state, the second state includes a first sub-state and a second sub-state, in the first sub-state, the inductor is in the second charging state, the first control unit closes the first switch and opens the second switch, the second control unit closes the third switch and opens the fourth switch, and the current flows from the low-voltage power supply into the inductor; In the second sub-state, the inductor is in the second discharge state, the first control unit opens the first switch and closes the second switch, the second control unit closes the fourth switch and opens the third switch, and the current flows from the inductor into the capacitor.

5. The energy support device according to any one of claims 2 to 4, characterized in that: The first control unit includes a first single-chip microcomputer and a first driver chip, the first single-chip microcomputer and the first driver chip are connected in series, the first single-chip microcomputer is used to monitor the output voltage value of the low-voltage power supply, and the first driver chip is used to control the first switch and / or the second switch to be turned off or on.

6. The energy support device according to any one of claims 2 to 4, characterized in that: The second control unit includes a second single-chip microcomputer and a second driver chip, the second single-chip microcomputer and the second driver chip are connected in series, the second single-chip microcomputer is used to monitor the output current value of the capacitor, and the second driver chip is used to control the third switch and / or the fourth switch to be closed or opened.

7. The energy support device according to claim 1, characterized in that: The capacitor includes a plurality of capacitors connected in series.

8. The energy support device according to claim 2, characterized in that: The first switch, the second switch, the third switch, and the fourth switch are all MOS tubes.

9. A low voltage power distribution system, characterized in that: Comprising the energy support device according to any one of claims 1 to 8, the low-voltage power distribution system further comprises a load, and the load is connected to the low-voltage power supply of the energy support device.

10. The low voltage power distribution system according to claim 9, characterized in that: The load includes a power assist motor.

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