Power supply circuit and electronic equipment

Abstract

A power supply circuit and an electronic device belong to the technical field of integrated control, and a first conversion circuit stops converting an energy storage voltage into a control voltage in response to the energy storage voltage being less than a first preset value under the condition of stopping accessing a power supply direct current; the energy storage circuit outputs the energy storage voltage; the switching circuit responds to the stop of the control voltage and disconnects the output of the energy storage voltage; the real-time clock circuit works according to the energy storage voltage, the endurance time of the real-time clock circuit is prolonged under the condition of not additionally installing a battery, and the continuity and accuracy of the real-time clock circuit are improved.

Description

Technical Field

[0001] This application belongs to the field of integrated control technology, and in particular relates to a power supply circuit and electronic equipment. Background Technology

[0002] The real-time clock (RTC) section of a hardware circuit is typically battery-powered, ensuring its continuity and accuracy as long as the battery is functioning properly. However, in practical applications, to save costs, a battery may not be installed, which can affect the continuity and accuracy of the RTC. Therefore, a power supply circuit is needed that can ensure the continuity of power supply to the RTC while saving costs. Utility Model Content

[0003] The purpose of this application is to provide a power supply circuit and electronic device that aims to solve the problem that existing power supply circuits cannot balance cost and the continuity of RTC power supply.

[0004] This application provides a power supply circuit, including:

[0005] The first conversion circuit is used to stop converting the energy storage voltage into a control voltage in response to the energy storage voltage being less than a first preset value when the DC power supply is stopped.

[0006] Energy storage circuit, used to output the energy storage voltage;

[0007] A switching circuit, connected to the first output terminal of the first conversion circuit and the energy storage circuit, is used to disconnect the output of the energy storage voltage to the first conversion circuit in response to the cessation of the control voltage;

[0008] A real-time clock circuit, connected to the switching circuit and the energy storage circuit, is used to operate according to the energy storage voltage.

[0009] In one embodiment, the first conversion circuit, connected to the switching circuit, is further configured to convert the supplied DC power into the control voltage;

[0010] The switching circuit is connected to the first conversion circuit, the energy storage circuit and the real-time clock circuit, and is also used to transmit the DC power supply based on the control voltage.

[0011] The energy storage circuit is also used to charge the device according to the supplied DC power.

[0012] In one embodiment, the power supply circuit further includes:

[0013] A current-limiting circuit, connected to the switching circuit, is used to limit the current of the supplied DC power.

[0014] The switching circuit is specifically used to transmit the current-limited DC power supply based on the control voltage.

[0015] The energy storage circuit is specifically used to charge the device based on the current-limited DC power supply.

[0016] In one embodiment, the switching circuit includes a field-effect transistor, a transistor, a second resistor, a third resistor, and a fourth resistor;

[0017] The source of the field-effect transistor and the first end of the second resistor together serve as the energy storage voltage input terminal and the DC power supply output terminal of the switching circuit, connected to the energy storage circuit to input the energy storage voltage and output the DC power supply; the drain of the field-effect transistor serves as the energy storage voltage output terminal and the DC power supply input terminal of the switching circuit, connected to the input terminal of the first conversion circuit to output the energy storage voltage and input the DC power supply; the gate of the field-effect transistor, the second end of the second resistor, and the collector of the transistor are connected; the base of the transistor, the first end of the third resistor, and the first end of the fourth resistor are connected; the second end of the fourth resistor serves as the control voltage input terminal of the switching circuit, connected to the first output terminal of the first conversion circuit to input the control voltage; the emitter of the transistor and the second end of the third resistor are connected to the power supply ground.

[0018] In one embodiment, the energy storage circuit includes a capacitor;

[0019] The first terminal of the capacitor serves as the DC power input terminal and the energy storage voltage output terminal of the energy storage circuit, so as to input the DC power and output the energy storage voltage; the second terminal of the capacitor is connected to the power ground.

[0020] In one embodiment, the switching circuit is further configured to transmit the energy storage voltage based on the control voltage; the first conversion circuit is further configured to convert the supply DC power or the energy storage voltage into a supply voltage and the control voltage; the power supply circuit further includes:

[0021] The second conversion circuit is connected to the first conversion circuit and is used to receive the input voltage and convert the input voltage into the DC power supply.

[0022] A control circuit, connected to the second conversion circuit and the first conversion circuit, is used to perform power-down storage in response to the input voltage being less than a second preset value while the power supply voltage is in operation.

[0023] In one embodiment, the power supply circuit further includes:

[0024] A unidirectional conduction circuit, connected to the switching circuit and the first conversion circuit, is used to conduct the energy storage voltage unidirectionally.

[0025] The first conversion circuit is specifically used to convert the supplied DC power or the energy storage voltage after unidirectional conduction into the supply voltage and the control voltage.

[0026] In one embodiment, the first conversion circuit includes:

[0027] The voltage detection module, connected to the switching circuit, is used to output a shutdown signal in response to the energy storage voltage being less than a first preset value.

[0028] A voltage conversion module, connected to the voltage detection module, the control circuit, and the switching circuit, is used to disconnect the output of the power supply voltage and the control voltage in response to the shutdown signal.

[0029] In one embodiment, the voltage conversion module includes a first power management chip;

[0030] The enable terminal of the first power management chip serves as the shutdown signal input terminal of the voltage conversion module and is connected to the voltage detection module to input the shutdown signal; the voltage input terminal of the first power management chip serves as the DC power supply input terminal and the energy storage voltage input terminal of the voltage conversion module, used to input the DC power supply and the energy storage voltage; the first voltage output terminal of the first power management chip serves as the control voltage output terminal of the voltage conversion module and is connected to the switching circuit to output the control voltage; the second voltage output terminal of the first power management chip serves as the power supply voltage output terminal of the voltage conversion module and is connected to the control circuit to output the power supply voltage.

[0031] This application also provides an electronic device, which includes the power supply circuit described above.

[0032] The beneficial effects of this application embodiment compared with the prior art are as follows: the first conversion circuit stops converting the energy storage voltage into a control voltage in response to the energy storage voltage being less than a first preset value, and the switching circuit disconnects the output of the energy storage voltage in response to the cessation of the control voltage; thus, when the energy storage voltage is less than the first preset value, the switching circuit disconnects the circuit that supplies power to other functional circuits from the energy storage circuit. At this time, the energy storage circuit only supplies power to the real-time clock circuit, thereby reducing energy consumption and extending the battery life of the real-time clock circuit without installing an additional battery, thus improving the continuity of power supply to the real-time clock circuit. Attached Figure Description

[0033] To more clearly illustrate the technical applications in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of a power supply circuit provided in one embodiment of this application;

[0035] Figure 2 This is a schematic diagram of another power supply circuit provided in one embodiment of this application;

[0036] Figure 3 This is a schematic diagram of another power supply circuit provided in one embodiment of this application;

[0037] Figure 4 This is a schematic diagram of another power supply circuit provided in one embodiment of this application;

[0038] Figure 5 This is a schematic diagram of another power supply circuit provided in one embodiment of this application;

[0039] Figure 6 This is a schematic diagram of another power supply circuit provided in one embodiment of this application;

[0040] Figure 7 This is a partial example circuit schematic diagram of a power supply circuit provided in an embodiment of this application. Detailed Implementation

[0041] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0042] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0043] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0045] Figure 1 A schematic diagram of a power supply circuit according to an embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:

[0046] The aforementioned power supply circuit includes a first conversion circuit 10, an energy storage circuit 20, a switching circuit 30, and a real-time clock circuit 40.

[0047] The first conversion circuit 10 is used to stop converting the energy storage voltage into a control voltage in response to the energy storage voltage being less than a first preset value when the DC power supply is stopped.

[0048] Energy storage circuit 20 is used to output energy storage voltage.

[0049] The switching circuit 30 is connected to the first output terminal of the first conversion circuit 10 and the energy storage circuit 20, and is used to disconnect the output of the energy storage voltage to the first conversion circuit 10 in response to the cessation of the control voltage.

[0050] The real-time clock circuit 40 is connected to the switching circuit 30 and the energy storage circuit 20 and is used to operate according to the energy storage voltage.

[0051] In a specific implementation, a second diode D2 (not shown in the figure) can also be provided between the energy storage circuit 20 and the real-time clock circuit 40. The second diode D2 is used to conduct the energy storage voltage in one direction so as to output the energy storage voltage after unidirectional conduction to the real-time clock circuit 40. The real-time clock circuit 40 works specifically according to the energy storage voltage after unidirectional conduction.

[0052] The second diode D2 prevents the possibility of voltage reverse flow, thus improving the reliability of the power supply circuit.

[0053] The energy storage circuit 20 may include a supercapacitor.

[0054] As an example rather than a limitation, such as Figure 2 As shown, the first conversion circuit 10 is connected to the switching circuit 30 and is also used to convert the supplied DC power into a control voltage.

[0055] The switching circuit 30 is connected to the first conversion circuit 10, the energy storage circuit 20 and the real-time clock circuit 40, and is also used to transmit DC power based on the control voltage.

[0056] The energy storage circuit 20 is also used for charging based on the supplied DC power.

[0057] When connected to DC power, the first conversion circuit 10 converts the DC power to a control voltage. The switching circuit 30 transmits the DC power to the energy storage circuit 20 according to the control voltage. The energy storage circuit 20 is charged according to the DC power. The real-time clock circuit 40 operates according to the DC power.

[0058] The first conversion circuit 10 converts the DC power supply into a control voltage, which can flexibly adjust the value of the control voltage according to the voltage requirements of different switching circuits 30, thus broadening the applicable scenarios of the power supply circuit.

[0059] As an example rather than a limitation, such as Figure 3 As shown, the power supply circuit also includes a current limiting circuit 50.

[0060] The current limiting circuit 50 is connected to the switching circuit 30 and is used to limit the current of the supplied DC power.

[0061] The switching circuit 30 is specifically used to transmit the current-limited DC power supply based on the control voltage.

[0062] The energy storage circuit 20 is specifically used to charge the DC power supply after current limiting.

[0063] The current limiting circuit 50 limits the DC power supply to a range that the electronic components can withstand, thereby reducing the possibility of damage to the electronic components due to overcurrent and extending the service life of the power supply circuit.

[0064] As an example rather than a limitation, such as Figure 4 As shown, the switching circuit 30 is also used to transmit the energy storage voltage based on the control voltage; the first conversion circuit 10 is also used to convert the power supply DC or energy storage voltage into the power supply voltage and the control voltage; the power supply circuit also includes a second conversion circuit 60 and a control circuit 70.

[0065] The second conversion circuit 60 is connected to the first conversion circuit 10 and is used to receive the input voltage and convert the input voltage into DC power.

[0066] The control circuit 70, connected to the second conversion circuit 60 and the first conversion circuit 10, is used to perform power-down storage in response to the input voltage being less than a second preset value while the power supply voltage is on.

[0067] In practice, the input voltage and the second preset value can both be set according to actual needs. For example, the input voltage can be set to 24V and the second preset value can be set to 17V.

[0068] When the input voltage drops, the voltage drops rapidly. If the energy storage circuit 20 is not configured, the response time of the control circuit 70 for power-down storage is short, and the power-down storage fails. If the energy storage circuit 20 is configured, since the first conversion circuit 10 also converts the energy storage voltage into the supply voltage, the control circuit 70 can perform power-down storage when the supply voltage is on, which can effectively protect the data and improve the reliability of the power supply circuit.

[0069] In addition, the energy storage circuit 20 simultaneously realizes the power-down storage function of the control circuit 70 and the power-down retention function of the real-time clock circuit 40, which simplifies the power supply circuit structure and reduces hardware costs.

[0070] As an example rather than a limitation, such as Figure 5 As shown, the power supply circuit also includes a unidirectional conduction circuit 80.

[0071] The unidirectional conduction circuit 80 is connected to the switching circuit 30 and the first conversion circuit 10, and is used to conduct the energy storage voltage unidirectionally.

[0072] The first conversion circuit 10 is specifically used to convert the supplied DC power or the energy storage voltage after unidirectional conduction into the supply voltage and control voltage.

[0073] The reliability of the power supply circuit is improved by using a unidirectional conduction circuit 80.

[0074] As an example rather than a limitation, such as Figure 6 As shown, the first conversion circuit 10 includes a voltage detection module 11 and a voltage conversion module 12.

[0075] The voltage detection module 11 is connected to the second conversion circuit 60 and the switching circuit 30, and is used to output a shutdown signal in response to the energy storage voltage being less than a first preset value.

[0076] The voltage conversion module 12 is connected to the voltage detection module 11, the control circuit 70 and the switching circuit 30, and is used to disconnect the output of the power supply voltage and the control voltage in response to the shutdown signal.

[0077] By setting up the voltage detection module 11, the energy storage voltage can be monitored in real time, which facilitates accurate monitoring of the energy storage voltage and improves the reliability of the power supply circuit.

[0078] Figure 7 The illustration shows a partial example circuit structure of a power supply circuit provided in an embodiment of this application. For ease of explanation, only the parts related to the embodiment of this application are shown, and are described in detail below:

[0079] The switching circuit 30 includes a field-effect transistor Q1, a transistor Q2, a second resistor R2, a third resistor R3, and a fourth resistor R4.

[0080] The source of the field-effect transistor Q1 and the first terminal of the second resistor R2 together serve as the energy storage voltage input terminal and the power supply DC output terminal of the switching circuit 30, connected to the energy storage circuit 20 to input the energy storage voltage and output the power supply DC. The drain of the field-effect transistor Q1 serves as the energy storage voltage output terminal and the power supply DC input terminal of the switching circuit 30, connected to the input terminal of the first conversion circuit 10 to output the energy storage voltage and input the power supply DC. The gate of the field-effect transistor Q1, the second terminal of the second resistor R2, and the collector of the transistor Q2 are connected. The base of the transistor Q2, the first terminal of the third resistor R3, and the first terminal of the fourth resistor R4 are connected. The second terminal of the fourth resistor R4 serves as the control voltage input terminal of the switching circuit 30, connected to the first output terminal of the first conversion circuit 10 to input the control voltage. The emitter of the transistor Q2 and the second terminal of the third resistor R3 are connected to the power supply ground.

[0081] The field-effect transistor Q1 and the transistor Q2 have fast response speeds and low self-loss, which can improve the response time of the switching circuit 30 and reduce the energy consumption of the switching circuit 30.

[0082] The energy storage circuit 20 includes a capacitor C1.

[0083] The first terminal of capacitor C1 serves as the DC power input terminal and the energy storage voltage output terminal of energy storage circuit 20, so as to input DC power and output energy storage voltage; the second terminal of capacitor C1 is connected to the power ground.

[0084] It should be noted that the discharge time t of capacitor C1 depends on the initial voltage value V0 on capacitor C1, the final voltage value V1 that capacitor C1 can be charged to or discharged to, the voltage value Vt on capacitor C1 at time t, the resistance value R of the current limiting resistor, and the capacitance value C of capacitor C1. Specifically:

[0085] t = RC * Ln[(V1 - V0) / (V1 - Vt)]

[0086] This circuit is simple and reliable.

[0087] The voltage conversion module 12 includes a first power management chip U1.

[0088] The enable terminal EN of the first power management chip U1 serves as the shutdown signal input terminal of the voltage conversion module 12 and is connected to the voltage detection module 11 to input the shutdown signal. The voltage input terminal VIN of the first power management chip U1 serves as the power supply DC input terminal and the energy storage voltage input terminal of the voltage conversion module 12, and is used to input the power supply DC and the energy storage voltage. The first voltage output terminal VOUT1 of the first power management chip U1 serves as the control voltage output terminal of the voltage conversion module 12 and is connected to the switching circuit 30 to output the control voltage. The second voltage output terminal VOUT2 of the first power management chip U1 serves as the power supply voltage output terminal of the voltage conversion module 12 and is connected to the control circuit 70 to output the power supply voltage.

[0089] It should be noted that, in specific implementations, the voltage detection module 11 and the voltage conversion module 12 can be integrated into the same chip to simplify the design of the hardware circuit and improve the integration of the power supply circuit.

[0090] The first power management chip, U1, has a high degree of integration and is easy to use.

[0091] The current limiting circuit 50 includes a first resistor R1.

[0092] The first end of the first resistor R1 serves as the DC power input terminal of the current limiting circuit 50 to input DC power; the second end of the first resistor R1 serves as the DC power output terminal of the current limiting circuit 50 after current limiting, and is connected to the switching circuit 30 to output the DC power after current limiting.

[0093] The unidirectional conduction circuit 80 includes a first diode D1.

[0094] The positive terminal of the first diode D1 serves as the energy storage voltage input terminal of the unidirectional conduction circuit 80 and is connected to the switching circuit 30 to input the energy storage voltage; the negative terminal of the first diode D1 serves as the energy storage voltage output terminal after unidirectional conduction of the unidirectional conduction circuit 80 and is connected to the first conversion circuit 10 to output the energy storage voltage after unidirectional conduction.

[0095] The following is based on the working principle. Figure 7 Further explanation is provided below:

[0096] Upon power-up, the second conversion circuit 60 converts the input voltage into DC power and outputs it to the voltage detection module 11, the voltage input terminal VIN of the first power management chip U1, and the first terminal of the first resistor R1. The voltage detection module 11 stops outputting a shutdown signal based on the DC power supply. The first power management chip U1 converts the DC power supply into a control voltage and a supply voltage, and outputs the control voltage from the voltage output terminal VOUT1 of the first power management chip U1 to the second terminal of the fourth resistor R4. Transistor Q2 turns on, MOSFET Q1 turns on, and the first resistor R1 supplies power to the supply voltage. After DC current limiting, the current-limited DC power supply is output from the second terminal of the first resistor R1 to the drain of the field-effect transistor Q1, and then output from the source of the field-effect transistor Q1 to the first terminal of the capacitor C1 and the real-time clock circuit 40. The capacitor C1 is charged according to the current-limited DC power supply, and the real-time clock circuit 40 operates according to the current-limited DC power supply. The first power management chip U1 also outputs a power supply voltage from its second voltage output terminal VOUT2 to the control circuit 70. The control circuit 70 detects that the input voltage is normal and operates according to the power supply voltage.

[0097] When power is lost, the first terminal of the first capacitor C1 outputs the stored energy voltage to the drain of the field-effect transistor Q1 and the real-time clock circuit 40. The voltage is then output from the source of the field-effect transistor Q1 to the positive terminal of the first diode D1. After the first diode D1 conducts the stored energy voltage unidirectionally, the stored energy voltage is output from the negative terminal of the first diode D1 to the voltage input terminal VIN of the voltage detection module 11 and the first power management chip U1. If the stored energy voltage is greater than the first preset value, the voltage detection module 11 stops outputting the shutdown signal. The first power management chip U1 converts the stored energy voltage into the control voltage and the supply voltage. The control circuit 70 detects that the input voltage is less than the second preset value and performs power-down storage while the supply voltage is on. After a period of time, the stored energy voltage drops to the first preset value. The voltage detection module 11 outputs the shutdown signal to the enable terminal EN of the first power management chip U1. The first power management chip U1 stops outputting the control voltage and the supply voltage. The transistor Q2 is turned off, and the field-effect transistor Q1 is turned off. At this time, the stored energy voltage only supplies power to the real-time clock circuit 40, and the real-time clock circuit 40 operates according to the stored energy voltage.

[0098] This application also provides an electronic device that includes the power supply circuit described above.

[0099] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0100] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A power supply circuit, characterized in that, include: The first conversion circuit is used to stop converting the energy storage voltage into a control voltage in response to the energy storage voltage being less than a first preset value when the DC power supply is stopped. Energy storage circuit, used to output the energy storage voltage; A switching circuit, connected to the first output terminal of the first conversion circuit and the energy storage circuit, is used to disconnect the output of the energy storage voltage to the first conversion circuit in response to the cessation of the control voltage; A real-time clock circuit, connected to the switching circuit and the energy storage circuit, is used to operate according to the energy storage voltage; The switching circuit includes a field-effect transistor, a transistor, a second resistor, a third resistor, and a fourth resistor; The source of the field-effect transistor and the first end of the second resistor together serve as the energy storage voltage input terminal and the power supply DC output terminal of the switching circuit, and are connected to the energy storage circuit to input the energy storage voltage and output the power supply DC. The drain of the field-effect transistor serves as the energy storage voltage output terminal and the DC power input terminal of the switching circuit, and is connected to the input terminal of the first conversion circuit to output the energy storage voltage and input the DC power. The gate of the field-effect transistor, the second end of the second resistor, and the collector of the transistor are connected. The base of the transistor, the first end of the third resistor, and the first end of the fourth resistor are connected. The second end of the fourth resistor serves as the control voltage input terminal of the switching circuit and is connected to the first output terminal of the first conversion circuit to input the control voltage. The emitter of the transistor and the second end of the third resistor are connected to the power supply ground.

2. The power supply circuit as described in claim 1, characterized in that, The first conversion circuit is also used to convert the supplied DC power into the control voltage; The switching circuit is also connected to the input terminal of the first conversion circuit and the real-time clock circuit, and is also used to transmit the power supply DC based on the control voltage; The energy storage circuit is also used to charge the device according to the supplied DC power.

3. The power supply circuit as described in claim 2, characterized in that, Also includes: A current-limiting circuit, connected to the switching circuit, is used to limit the current of the supplied DC power. The switching circuit is specifically used to transmit the current-limited DC power supply based on the control voltage. The energy storage circuit is specifically used to charge the device based on the current-limited DC power supply.

4. The power supply circuit as described in claim 2, characterized in that, The energy storage circuit includes a capacitor; The first terminal of the capacitor serves as the DC power input terminal and the energy storage voltage output terminal of the energy storage circuit, so as to input the DC power and output the energy storage voltage; the second terminal of the capacitor is connected to the power ground.

5. The power supply circuit as described in claim 1, characterized in that, The switching circuit is further configured to transmit the energy storage voltage based on the control voltage; the first conversion circuit is further configured to convert the power supply DC or the energy storage voltage into a power supply voltage and the control voltage; the power supply circuit further includes: The second conversion circuit is connected to the first conversion circuit and is used to receive the input voltage and convert the input voltage into the DC power supply. A control circuit, connected to the second conversion circuit and the first conversion circuit, is used to perform power-down storage in response to the input voltage being less than a second preset value while the power supply voltage is in operation.

6. The power supply circuit as described in claim 5, characterized in that, Also includes: A unidirectional conduction circuit, connected to the switching circuit and the first conversion circuit, is used to conduct the energy storage voltage unidirectionally. The first conversion circuit is specifically used to convert the supplied DC power or the energy storage voltage after unidirectional conduction into the supply voltage and the control voltage.

7. The power supply circuit as described in claim 5, characterized in that, The first conversion circuit includes: The voltage detection module, connected to the switching circuit, is used to output a shutdown signal in response to the energy storage voltage being less than a first preset value. A voltage conversion module, connected to the voltage detection module, the control circuit, and the switching circuit, is used to disconnect the output of the power supply voltage and the control voltage in response to the shutdown signal.

8. The power supply circuit as described in claim 7, characterized in that, The voltage conversion module includes a first power management chip; The enable terminal of the first power management chip serves as the shutdown signal input terminal of the voltage conversion module and is connected to the voltage detection module to input the shutdown signal. The voltage input terminal of the first power management chip serves as the DC power input terminal and the energy storage voltage input terminal of the voltage conversion module, used to input the DC power and the energy storage voltage; the first voltage output terminal of the first power management chip serves as the control voltage output terminal of the voltage conversion module, connected to the switching circuit, to output the control voltage. The second voltage output terminal of the first power management chip serves as the power supply voltage output terminal of the voltage conversion module and is connected to the control circuit to output the power supply voltage.

9. An electronic device, characterized in that, Includes the power supply circuit as described in any one of claims 1 to 8.

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