Power supply circuit

Abstract

The utility model relates to the technical field of vehicles, and provides a power supply circuit which comprises a first voltage conversion module, a power battery, a storage battery, a low-voltage output end and a high-voltage output end, and the storage battery, the power battery and the first voltage conversion module are arranged in a power battery pack shell; the first voltage conversion module is respectively connected with the power battery and the storage battery, and is used for converting a first power supply voltage output by the power battery into a charging voltage according to the charging signal and charging the storage battery; the storage battery is connected with the low-voltage output end and used for outputting second power supply voltage to the low-voltage output end; wherein the first power supply voltage is higher than the second power supply voltage; the power battery is further connected with the high-voltage output end and used for outputting the first power supply voltage to the high-voltage power supply end. According to the technical scheme, the problem that in the prior art, a storage battery needs to occupy a certain arrangement space at the front end of the vehicle, and consequently the cost of the vehicle is increased can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a power supply circuit. BACKGROUND

[0002] The current vehicle electrical system, the low-voltage power supply device is a storage battery, the storage battery is usually arranged at the front end of the vehicle, in order to ensure the capacity of the storage battery, the volume of the storage battery is large, which needs to occupy a certain arrangement space, thereby increasing the cost of the vehicle. SUMMARY

[0003] In view of the above problems, the present application provides a power supply circuit to solve the problem that the storage battery needs to occupy a certain arrangement space at the front end of the vehicle in the prior art, thereby increasing the cost of the vehicle.

[0004] According to an aspect of an embodiment of the present application, a power supply circuit is provided, which comprises: a first voltage conversion module, a power battery, a storage battery, a low-voltage output end and a high-voltage output end, the storage battery, the power battery and the first voltage conversion module are arranged in the interior of a power battery package shell; the first voltage conversion module is connected with the power battery and the storage battery respectively, and is used for converting a first power supply voltage output by the power battery into a charging voltage according to a charging signal, and charging the storage battery; the storage battery is connected with the low-voltage output end, and is used for outputting a second power supply voltage to the low-voltage output end; wherein the first power supply voltage is higher than the second power supply voltage; the power battery is also connected with the high-voltage output end, and is also used for outputting the first power supply voltage to the high-voltage output end.

[0005] In an optional embodiment, the first voltage conversion module comprises: a first control unit; the first control unit is connected with the power battery and the storage battery respectively, and is used for generating the charging signal when detecting that the power value of the power battery is greater than a preset power battery power value and the power value of the storage battery is less than a preset storage battery power value.

[0006] In an optional embodiment, the first voltage conversion module further comprises: a first voltage conversion unit and a first switch unit; the first voltage conversion unit is connected with the first control unit and the power battery respectively, and is used for converting the first power supply voltage output by the power battery into a charging voltage according to the charging signal output by the first control unit; the first switch unit is connected with the first control unit, the first voltage conversion unit and the storage battery respectively, and is used for closing according to the charging signal issued by the first control unit, so that the first voltage conversion unit transmits the charging voltage to the storage battery to charge the storage battery.

[0007] In an alternative embodiment, the first control unit is further configured to generate a backup power supply signal when the battery fails and the power battery has a power value greater than a preset power battery power value; the first voltage conversion unit is further configured to convert the first power supply voltage into the second power supply voltage according to the backup power supply signal generated by the first control unit; and the first switch unit is further configured to close the backup power supply signal generated by the first control unit to enable the second power supply voltage to be transmitted to the low-voltage output terminal through the battery.

[0008] In an alternative embodiment, the first voltage conversion unit comprises a first MOS transistor, a second MOS transistor, a first inductor, a first capacitor and a first resistor; a gate of the first MOS transistor is connected to the first control unit; a drain of the first MOS transistor is connected to a first output terminal of the power battery; a source of the first MOS transistor is connected to a drain of the second MOS transistor and a first terminal of the first inductor; a gate of the second MOS transistor is connected to the first control unit; a source of the second MOS transistor is connected to a second terminal of the first capacitor, a second terminal of the first resistor and a second output terminal of the power battery; and a second terminal of the first inductor is connected to a first terminal of the first capacitor, a first terminal of the first resistor and a first terminal of the first switch unit.

[0009] In an alternative embodiment, the power supply circuit further comprises a second voltage conversion module; the second voltage conversion module and the first voltage conversion module are wirelessly connected and are respectively connected to the high-voltage output terminal and the low-voltage output terminal; and the second voltage conversion module is configured to convert the first power supply voltage output by the high-voltage output terminal into the second power supply voltage according to the failure signal generated by the first voltage conversion module and output the second power supply voltage to the low-voltage output terminal.

[0010] In an alternative embodiment, the second voltage conversion module comprises a second control unit; the second control unit is wirelessly connected to the first control unit and is configured to receive the failure signal generated by the first control unit.

[0011] In an alternative embodiment, the second voltage conversion module further comprises a second voltage conversion unit; the second voltage conversion unit is connected to the second control unit, the high-voltage output terminal and the low-voltage output terminal; and the second voltage conversion unit is configured to convert the first power supply voltage output by the high-voltage output terminal into the second power supply voltage according to the failure signal generated by the second control unit and output the second power supply voltage to the low-voltage output terminal.

[0012] In an alternative embodiment, the second voltage conversion unit comprises a third MOS transistor, a diode, a second inductor, a third capacitor and a second resistor; the gate of the third MOS transistor is connected to the second control unit, the source of the third MOS transistor is connected to the first output terminal of the power battery, and the drain of the third MOS transistor is connected to the first terminal of the second inductor and the negative electrode of the diode, respectively; the positive electrode of the diode is connected to the third capacitor, the second terminal of the second resistor and the second output terminal of the power battery, respectively; and the second terminal of the second inductor is connected to the first terminal of the third capacitor and the first terminal of the second resistor, respectively.

[0013] In an alternative embodiment, the second voltage conversion unit further comprises a fourth capacitor; and the two terminals of the fourth capacitor are connected to the first output terminal and the second output terminal of the power battery, respectively.

[0014] The first voltage conversion module, the power battery and the storage battery are arranged inside the power battery package shell, so that the storage battery is integrated with the power battery, and the power battery is arranged on the chassis of the vehicle, thereby saving the independent arrangement space of the storage battery at the front end of the vehicle and saving the cost of the vehicle. The first power supply voltage output by the power battery is converted into a charging voltage acceptable to the storage battery by the first voltage conversion module, so that the storage battery is charged. After the storage battery is charged, the second power supply voltage can be output to the low-voltage output end, and the low-voltage load connected to the low-voltage power supply end can work according to the second power supply voltage provided by the low-voltage power supply end. Meanwhile, the power battery provides the first power supply voltage to the high-voltage output end, and when the high-voltage load is connected to the high-voltage power supply end, the high-voltage load can work according to the first power supply voltage provided by the high-voltage load, so that the power battery outputs the first power supply voltage and the second power supply voltage at the same time to meet the needs of different voltage loads.

[0015] The above description is only a summary of the technical solutions of the embodiments of the present application, in order to more clearly understand the technical means of the embodiments of the present application, the embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the embodiments of the present application more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are only used to show the embodiments and are not considered as limitations of the present application. Moreover, the same reference signs are used to represent the same parts throughout the drawings. In the drawings:

[0017] Figure 1 A structure diagram of a first embodiment of a power supply circuit provided by the present application is shown.

[0018] Figure 2 A structure diagram of a second embodiment of a power supply circuit provided by the present application is shown.

[0019] Figure 3 A circuit diagram of a power supply circuit provided by the present application is shown. DETAILED DESCRIPTION

[0020] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, the same numbers are used to indicate the same or similar components. The embodiments described in the following exemplary embodiments are not meant to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0021] The block diagrams shown in the drawings are merely functional entities, and do not necessarily have to correspond to physically independent entities. That is, the functional entities can be implemented in software, or in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0022] The flowcharts shown in the drawings are merely exemplary illustrations, and do not necessarily include all contents and operations / steps, nor do they have to be executed in the order described. For example, some operations / steps can be further divided, and some operations / steps can be combined or partially combined, so that the actual execution order can be changed according to actual conditions.

[0023] In the present application, "a plurality of" means two or more. The association relationship of "and / or" describes the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. The character " / " generally means that the associated objects before and after are in an "or" relationship.

[0024] Figure 1 A structure diagram of a first embodiment of a power supply circuit provided by the present application is shown. Please refer to Figure 1 As shown, the power supply circuit includes a first voltage conversion module 110, a power battery 130, a storage battery 120, a low-voltage output end 140, and a high-voltage output end 150, wherein the storage battery 120, the power battery 130, and the first voltage conversion module 110 are arranged inside a power battery package shell 100.

[0025] The first voltage conversion module 110 is connected to the power battery 130 and the storage battery 120, respectively, for converting a first power supply voltage output by the power battery 130 into a charging voltage according to a charging signal, and charging the storage battery 120.

[0026] The storage battery 120 is connected with the low-voltage output end 140, and is configured to output a second power supply voltage to the low-voltage output end 140; wherein the first power supply voltage is higher than the second power supply voltage.

[0027] The power battery 130 is also connected with the high-voltage output end 150, and is further configured to output the first power supply voltage to the high-voltage output end.

[0028] In the embodiment, by arranging the first voltage conversion module 110, the power battery 130 and the storage battery 120 inside the power battery package shell 100, the storage battery 120 is integrated with the power battery 130, and the power battery package is arranged on the chassis of the vehicle, so that the independent arrangement space of the storage battery 120 at the front end of the vehicle is saved, the cost of the vehicle is saved, and the storage battery 120 and the power battery 130 can adopt lithium batteries. Compared with the lead-acid batteries in the prior art, the volume of the power battery package can be further reduced, and the arrangement space of the vehicle is saved. In the embodiment, the first voltage conversion module 110 converts the first power supply voltage output by the power battery 130 into a charging voltage that can be accepted by the storage battery 120, so as to realize charging of the storage battery 120. After the storage battery 120 is charged, the second power supply voltage can be output to the low-voltage output end 140, and the low-voltage load can work according to the second power supply voltage provided by the low-voltage power supply end after being connected to the low-voltage power supply end. At the same time, the power battery 130 provides the first power supply voltage to the high-voltage output end 150, and the high-voltage load can work according to the first power supply voltage provided by the high-voltage load after being connected to the high-voltage power supply end, so as to realize that the power battery 130 outputs the first power supply voltage and the second power supply voltage at the same time, so as to meet the needs of different voltage loads.

[0029] Figure 2 A structure diagram of a second embodiment of a power supply circuit provided by the application is shown. Please refer to Figure 2 As shown, the first voltage conversion module 110 includes a first control unit 111; the first control unit 111 is connected with the power battery 130 and the storage battery 120 respectively, and is configured to generate the charging signal when detecting that the power value of the power battery 130 is greater than a preset power battery 130 power value and the power value of the storage battery 120 is less than a preset storage battery 120 power value.

[0030] In the embodiment, the first control unit 111 is a controller of the first voltage conversion module 110, which can detect the power value of the storage battery 120 to determine whether the power value of the storage battery 120 is used up, so as to determine whether the storage battery 120 needs to be charged, and detect the power value of the power battery 130 to determine whether the power value of the power battery 130 is used up, so as to determine whether the power battery 130 can charge the storage battery 120, and if it is determined that the power value of the power battery 130 is greater than a preset power battery 130 power value and the power value of the storage battery 120 is less than a preset storage battery 120 power value, it can be determined that the power battery 130 charges the storage battery 120, thereby generating a charging signal.

[0031] In another embodiment of the present application, referring to Figure 2 As shown in the figure, the first voltage conversion module 110 further comprises a first voltage conversion unit 112 and a first switch unit 113.

[0032] The first voltage conversion unit 112 is connected to the first control unit 111 and the power battery 130 respectively, for converting the first power supply voltage output by the power battery 130 into a charging voltage according to the charging signal output by the first control unit 111.

[0033] The first switch unit 113 is connected to the first control unit 111, the first voltage conversion unit 112 and the storage battery 120 respectively, for closing according to the charging signal sent by the first control unit 111, so that the first voltage conversion unit 112 transmits the charging voltage to the storage battery 120 to charge the storage battery 120.

[0034] In the embodiment, the first voltage conversion unit 112 converts the first power supply voltage output by the power battery 130 into a charging voltage to enable charging of the storage battery 120, and at the same time, the first switch unit 113 also receives the charging signal and closes according to the charging signal, so that the first voltage conversion unit 112 transmits the charging voltage to the storage battery 120 to charge the storage battery 120.

[0035] In another embodiment of the present application, the first control unit is further configured to generate a backup power supply signal when it is detected that the storage battery fails and the power value of the power battery is greater than a preset power battery power value.

[0036] The first voltage conversion unit is further configured to convert the first power supply voltage into the second power supply voltage according to the backup power supply signal sent by the first control unit.

[0037] The first switch unit is also used for closing the standby power supply signal sent by the first control unit, so that the second power supply voltage is transmitted to the low-voltage output terminal through the storage battery.

[0038] In the embodiment, when the storage battery is normal and has sufficient power, the first control unit is in an off state, and the storage battery provides the second power supply voltage to the low-voltage power supply terminal. The first control unit detects the storage battery in real time. If the storage battery is detected to be faulty, for example, if the storage battery continuously inputs low voltage or the storage battery cannot output voltage, and if the power battery value is detected to be greater than the preset power battery value, it is indicated that the power battery value is sufficient, and a standby power supply signal is generated. The first voltage conversion unit converts the first power supply voltage output by the power battery into the second power supply voltage according to the standby power supply signal, so as to enable the second power supply voltage to be output to the low-voltage power supply terminal. When the storage battery is faulty, the storage battery is equivalent to a wire. After the first switch unit is closed according to the standby power supply signal, the second power supply voltage output by the first voltage conversion unit can be directly transmitted to the low-voltage power supply terminal for use by the low-voltage load. For example, when the storage battery is faulty, if the vehicle is not started, the second power supply voltage provided by the storage battery can still be used to supply power to the vehicle controller, so as to enable the vehicle to be started. When the vehicle needs to be powered off, the second power supply voltage provided by the storage battery can still be used to supply power to the vehicle controller, so as to enable the vehicle to be powered off. It should be noted that when the vehicle is in a wake-up state or a sleep state, the power battery always outputs the first power supply voltage to the first voltage conversion module, and the power battery value consumed by the first voltage conversion low-power module is very small.

[0039] Figure 3 A circuit diagram of a power supply circuit provided by the present application is shown. Please refer to Figure 3 As shown in the figure, the first voltage conversion unit 112 comprises a first MOS tube Q1, a second MOS tube Q2, a first inductor L1, a first capacitor C1, and a first resistor R1. The gate of the first MOS tube Q1 is connected to the first control unit 111. The drain of the first MOS tube Q1 is connected to the first output terminal of the power battery 130. The source of the first MOS tube Q1 is connected to the drain of the second MOS tube Q2 and the first end of the first inductor L1, respectively. The gate of the second MOS tube Q2 is connected to the first control unit 111. The source of the second MOS tube Q2 is connected to the second end of the first capacitor C1, the second end of the first resistor R1, and the second output terminal of the power battery 130, respectively. The second end of the first inductor L1 is connected to the first end of the first capacitor C1, the first end of the first resistor R1, and the first end of the first switch unit 113, respectively. The first voltage conversion unit 112 further comprises a second capacitor C2. The two ends of the second capacitor C2 are connected to the first output terminal and the second output terminal of the power battery 130, respectively.

[0040] In the embodiment, the first MOS Q1 and the second MOS Q2 are periodically turned on or turned off according to the received charging signal. When the first MOS Q1 is turned on and the second MOS Q2 is turned off, the first power supply voltage output by the power battery 130 provides voltage for the first resistor R1, and the first inductor L1 offsets a part of the first power supply voltage. When the first MOS Q1 is turned off and the second MOS Q2 is turned on, the input first power supply voltage cannot provide voltage for the first resistor R1, and the voltage provided by the first capacitor C1 and the first inductor L1 for the first resistor R1 decreases in a short time, so as to realize the step-down of the first power supply voltage to the charging voltage or the second power supply voltage. It should be noted that the second capacitor C2 functions to filter the first power supply voltage output by the power battery 130, so as to make the output first power supply voltage more stable.

[0041] In another embodiment of the present application, referring to Figure 2 The power supply circuit further comprises a second voltage conversion module 200. The second voltage conversion module 200 and the first voltage conversion module 110 are wirelessly connected, and are respectively connected with the high-voltage output end 150 and the low-voltage output end 140. The second voltage conversion module 200 is configured to convert the first power supply voltage output by the high-voltage output end 150 into the second power supply voltage according to the fault signal sent by the first voltage conversion module 110, and output the second power supply voltage to the low-voltage output end 140.

[0042] In the embodiment, since the first voltage conversion module 110 may have a fault, when the first voltage conversion module 110 fails, if the power of the storage battery 120 is low, the storage battery 120 will not be able to be charged, so as to not be able to output the second power supply voltage. When the second voltage conversion module 200 receives the fault signal sent by the first voltage conversion module 110, the second voltage conversion module 200 converts the first power supply voltage output by the high-voltage output end 150 into the second power supply voltage, and outputs the second power supply voltage to the low-voltage output end 140, so as to replace the storage battery 120 to output the second power supply voltage, and ensure the power supply demand of the low-voltage load.

[0043] In another embodiment of the present application, referring to Figure 2 The second voltage conversion module 200 comprises a second control unit 211. The second control unit 211 is wirelessly connected with the first control unit 111, and is configured to receive the fault signal sent by the first control unit 111.

[0044] The second voltage conversion module 200 further comprises a second voltage conversion unit 212, which is connected with the second control unit 211, the high-voltage output end 150 and the low-voltage output end respectively, and is used for converting the first power supply voltage output by the high-voltage output end 150 into the second power supply voltage according to the fault signal sent by the second control unit 211, and outputting the second power supply voltage to the low-voltage output end 140.

[0045] In the embodiment, the first voltage conversion unit 112, which is usually faulty, is exemplified as the first control module. After the first control unit 111 detects that the first voltage conversion unit 112 is faulty, the first control unit 111 sends a fault signal to the second conversion unit of the second conversion module. The second conversion unit converts the first power supply voltage output by the high-voltage output end 150 into the second power supply voltage and outputs the second power supply voltage to the low-voltage output end 140, so as to provide the second power supply voltage for the low-voltage load when the second power supply module is faulty.

[0046] In another embodiment of the present application, referring to Figure 3 As shown in the figure, the second voltage conversion unit 212 comprises a third MOS tube Q3, a diode D1, a second inductor L2, a third capacitor C3 and a second resistor R2. The gate of the third MOS tube Q3 is connected with the second control unit 211. The source of the third MOS tube Q3 is connected with the first output end of the power battery 130. The drain of the third MOS tube Q3 is connected with the first end of the second inductor L2 and the negative electrode of the diode D1 respectively. The positive electrode of the diode D1 is connected with the third capacitor C3, the second end of the second resistor R2 and the second output end of the power battery 130 respectively. The second end of the second inductor L2 is connected with the first end of the third capacitor C3 and the first end of the second resistor R2 respectively. The second voltage conversion unit further comprises a fourth capacitor C4. The two ends of the fourth capacitor C4 are connected with the first output end and the second output end of the power battery 130 respectively.

[0047] In the embodiment, the third MOS Q3 is periodically turned on or turned off according to the received fault signal. When the third MOS Q3 is turned on, the diode D1 is turned off, the first power supply voltage output by the power battery 130 provides voltage for the second resistor R2, and the second inductor L2 offsets a part of the first power supply voltage. When the third MOS Q3 is turned off, the diode D1 is turned on, and the input first power supply voltage cannot provide voltage for the first resistor R1. The voltage provided by the third capacitor C3 and the second inductor L2 for the second resistor R2 decreases in a short time, so as to realize the step-down of the first power supply voltage to the second power supply voltage. It should be noted that the fourth capacitor C4 filters the first power supply voltage output by the power battery 130, so that the output first power supply voltage is more stable. It should be noted that the first control unit 111 and the second control unit 211 are not shown in the Figure 3 .

[0048] The above description is only a preferred exemplary embodiment of the present application, and is not intended to limit the implementation of the present application. Those skilled in the art can easily make corresponding modifications or changes according to the main concept and spirit of the present application. Therefore, the protection scope of the present application should be subject to the protection scope required by the claims.

Claims

1. A power supply circuit, characterized by comprising: The power supply circuit comprises a first voltage conversion module, a power battery, a storage battery, a low-voltage output end and a high-voltage output end, wherein the storage battery, the power battery and the first voltage conversion module are arranged inside a power battery package shell; The first voltage conversion module is connected with the power battery and the storage battery respectively, and is used for converting a first power supply voltage output by the power battery into a charging voltage according to a charging signal, and charging the storage battery; The storage battery is connected with the low-voltage output end, and is used for outputting a second power supply voltage to the low-voltage output end; wherein the first power supply voltage is higher than the second power supply voltage; The power battery is also connected with the high-voltage output end, and is also used for outputting the first power supply voltage to the high-voltage output end.

2. The power supply circuit of claim 1, wherein, The first voltage conversion module comprises a first control unit; The first control unit is connected with the power battery and the storage battery respectively, and is used for generating the charging signal when detecting that the power value of the power battery is greater than a preset power battery power value and the power value of the storage battery is less than a preset storage battery power value.

3. The power supply circuit of claim 2, wherein, The first voltage conversion module further comprises a first voltage conversion unit and a first switch unit; The first voltage conversion unit is connected with the first control unit and the power battery respectively, and is used for converting the first power supply voltage output by the power battery into the charging voltage according to the charging signal output by the first control unit; The first switch unit is connected with the first control unit, the first voltage conversion unit and the storage battery respectively, and is used for closing according to the charging signal sent by the first control unit, so that the first voltage conversion unit transmits the charging voltage to the storage battery to charge the storage battery.

4. The power supply circuit according to claim 3, characterized in that, The first control unit is also used for generating a backup power supply signal when detecting that the storage battery is faulty and the power value of the power battery is greater than the preset power battery power value; The first voltage conversion unit is also used for converting the first power supply voltage into the second power supply voltage according to the backup power supply signal sent by the first control unit; The first switch unit is also used for closing according to the backup power supply signal sent by the first control unit, so that the second power supply voltage is transmitted to the low-voltage output end through the storage battery.

5. The power supply circuit of claim 3, wherein, The first voltage conversion unit comprises a first MOS tube, a second MOS tube, a first inductor, a first capacitor and a first resistor; The gate of the first MOS tube is connected with the first control unit, the drain of the first MOS tube is connected with a first output end of the power battery, and the source of the first MOS tube is connected with the drain of the second MOS tube and a first end of the first inductor respectively; The gate of the second MOS tube is connected with the first control unit, and the source of the second MOS tube is connected with a second end of the first capacitor, a second end of the first resistor and a second output end of the power battery respectively; The second end of the first inductor is connected with the first end of the first capacitor, the first end of the first resistor and a first end of the first switch unit respectively.

6. The power supply circuit of claim 2, wherein, The power supply circuit further comprises a second voltage conversion module; The second voltage conversion module and the first voltage conversion module are wirelessly connected and are connected with the high-voltage output end and the low-voltage output end respectively, for converting the first power supply voltage output by the high-voltage output end into the second power supply voltage according to the fault signal sent by the first voltage conversion module, and outputting the second power supply voltage to the low-voltage output end.

7. The power supply circuit of claim 6, wherein, The second voltage conversion module comprises a second control unit. The second control unit is wirelessly connected with the first control unit, for receiving the fault signal sent by the first control unit.

8. The power supply circuit of claim 7, wherein, The second voltage conversion module further comprises a second voltage conversion unit. The second voltage conversion unit is connected with the second control unit, the high-voltage output end and the low-voltage output end respectively, for converting the first power supply voltage output by the high-voltage output end into the second power supply voltage according to the fault signal sent by the second control unit, and outputting the second power supply voltage to the low-voltage output end.

9. The power supply circuit of claim 8, wherein, The second voltage conversion unit comprises a third MOS tube, a diode, a second inductor, a third capacitor and a second resistor. The gate of the third MOS tube is connected with the second control unit, the source of the third MOS tube is connected with the first output end of the power battery, and the drain of the third MOS tube is connected with the first end of the second inductor and the negative electrode of the diode respectively. The positive electrode of the diode is connected with the third capacitor, the second end of the second resistor and the second output end of the power battery respectively. The second end of the second inductor is connected with the first end of the third capacitor and the first end of the second resistor respectively.

10. The power supply circuit of claim 9, wherein, The second voltage conversion unit further comprises a fourth capacitor, and the two ends of the fourth capacitor are connected with the first output end and the second output end of the power battery respectively.

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