CN217406203U - Power supply circuit and electronic equipment - Google Patents

Abstract

The application discloses power supply circuit and electronic equipment, this power supply circuit includes power interface, equipment interface, at least one load interface, signal preprocessing module, first switch module, second switch module, third switch module and energy storage module. The signal preprocessing module is used for outputting a first voltage when the power interface is connected with the input power supply. The first switch module is used for conducting according to a power supply provided by the external equipment when the equipment interface is connected with the external equipment, so that the energy storage module is charged by the first voltage. The second switch module is used for being conducted when the voltage at the two ends of the energy storage module is charged to a second voltage. The third switch module is used for forming a loop with the first voltage and conducting when the second switch module is conducted so as to establish connection between the first end of the power interface and the first end of the load interface and supply power to a load connected with the load interface according to the input power. Through the mode, the purpose of reducing the cost can be achieved.

Description

Power supply circuit and electronic equipment

Technical Field

The present disclosure relates to electronic circuits, and particularly to a power supply circuit and an electronic device.

Background

With the development of modern society and the continuous improvement of people's living standard, the use of household appliances is more and more popular. How to save energy for household appliances also becomes a key point of attention.

At present, in the application process of the household appliance, when the user has used up the household appliance, the user usually stops the use of the functions of the household appliance for convenience, and the connection between the household appliance and the power supply is not disconnected. However, this approach can result in the household appliance being in standby for a long time and there is always a power loss.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application aims to provide a power supply circuit and electronic equipment, and the application can achieve the purpose of reducing cost.

To achieve the above object, in a first aspect, the present application provides a power supply circuit, including:

the device comprises a power interface, an equipment interface, at least one load interface, a signal preprocessing module, a first switch module, a second switch module, a third switch module and an energy storage module;

the first end of the power interface is connected with the first end of the signal preprocessing module and the first end of the third switch module respectively, the first end of the load interface is connected with the second end of the third switch module, the second end of the signal preprocessing module is connected with the third end of the third switch module and the first end of the first switch module respectively, the second end of the first switch module is connected with the first end of the equipment interface, the third end of the first switch module is connected with the second end of the equipment interface, the fourth end of the first switch module is connected with the first end of the energy storage module and the first end of the second switch module respectively, the second end of the second switch module is connected with the fourth end of the third switch module, and the second end of the power interface, the second end of the load interface, the third end of the signal preprocessing module, The second end of the energy storage module and the third end of the second switch module are both grounded;

the signal preprocessing module is used for preprocessing the input power supply to output a first voltage when the power supply interface is connected with the input power supply;

the first switch module is used for conducting according to a power supply provided by external equipment when the equipment interface is connected with the external equipment, so that the energy storage module is charged by the first voltage;

the second switch module is used for being switched on when the voltage at the two ends of the energy storage module is charged to a second voltage;

the third switch module is used for forming a loop with the first voltage and conducting when the second switch module is conducted so as to establish connection between the first end of the power interface and the first end of the load interface and supply power to a load connected with the load interface according to the input power.

In an optional manner, the signal preprocessing module includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor, a first diode, a second diode, and a first voltage regulator diode;

the first resistor is connected in series with the second resistor, a circuit formed by connecting the first resistor in series with the second resistor is connected in parallel with the first capacitor and the second capacitor, the first end of the first capacitor is connected with the first end of the power interface and the first end of the third switch module respectively, the second end of the first capacitor is connected with the anode of the first diode and the cathode of the second diode respectively, the cathode of the first diode is connected with the first end of the third capacitor, the cathode of the first voltage stabilizing diode, the third end of the third switch module and the first end of the first switch module respectively, the second end of the third capacitor, the anode of the second diode and the anode of the first voltage stabilizing diode are all grounded, and the third capacitor is connected in parallel with the fourth capacitor.

In an optional mode, the first switch module includes an optocoupler, a third diode and a third resistor, where the optocoupler includes a light emitter and a light receiver;

the first end of the light emitter is connected with the first end of the equipment interface through the third resistor, the second end of the light emitter is connected with the second end of the equipment interface, the first end of the light receiver is respectively connected with the first end of the third switch module and the second end of the signal preprocessing module, the second end of the light receiver is connected with the anode of the third diode, and the cathode of the third diode is respectively connected with the first end of the energy storage module and the first end of the second switch module.

In an alternative mode, the energy storage module comprises a fifth capacitor;

and the first end of the fifth capacitor is connected with the fourth end of the first switch module and the first end of the second switch module, and the second end of the fifth capacitor is grounded.

In an optional manner, the second switch module includes a switch tube, a fourth resistor, and a second zener diode;

the first end of the switch tube is connected with the first end of the energy storage module and the fourth end of the first switch module through the fourth resistor, the second end of the switch tube is grounded, and the first end of the switch tube is connected with the fourth end of the third switch module.

In an alternative, the third switching module includes a relay and a fourth diode;

one contact in a pair of normally open contacts of the relay is connected with the first end of the power interface, the other contact is connected with the first end of the load interface, the anode of the fourth diode is connected with the first end of the coil of the relay and the second end of the second switch module, and the cathode of the fourth diode is connected with the second end of the coil of the relay, the second end of the signal preprocessing module and the first end of the first switch module.

In an optional manner, the power supply circuit further comprises a key;

the first end of the key is connected with the first end of the signal preprocessing module, the first end of the first switch module and the first end of the third switch module respectively, and the second end of the key is connected with the first end of the energy storage module, the fourth end of the first switch module and the first end of the second switch module respectively.

In an optional manner, the at least one load interface includes a first load interface and a second load interface, and the power supply circuit further includes a fifth resistor;

the first end of the first load interface is connected with the first end of the second load interface and the second end of the third switch module respectively, the second end of the first load interface is connected with the second end of the second load interface and the first end of the fifth resistor respectively, and the second end of the fifth resistor is grounded.

In a second aspect, the present application provides an electronic device comprising the power supply circuit as described above.

The beneficial effects of the embodiment of the application are that: the power supply circuit provided by the application comprises a power supply interface, an equipment interface, at least one load interface, a signal preprocessing module, a first switch module, a second switch module, a third switch module and an energy storage module. The power interface is connected with the signal preprocessing module, the third switch module and the ground, the load interface is connected with the third switch module and the ground, the signal preprocessing module is connected with the third switch module and the first switch module, the first switch module is connected with the equipment interface, the energy storage module and the second switch module, and the second switch module is connected with the third switch module. When the power interface is connected with the input power supply, the load interface is connected with the load, and the equipment interface is connected with the external equipment, the first switch module is switched on according to the voltage provided by the external equipment so as to charge the energy storage module, and the second switch module is switched on when the voltage at the two ends of the energy storage module is charged to the second voltage. Meanwhile, the signal preprocessing module can preprocess the input power supply to output the first voltage, and then the third switch module is conducted due to the fact that the third switch module forms a loop with the first voltage, connection between the first end of the power interface and the first end of the load interface is established, and power can be supplied to a load connected with the load interface through the input power supply. Therefore, other equipment can be powered without matching a corresponding charging head or an existing conversion interface in the related technology, and cost reduction is facilitated.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

Fig. 1 is a schematic structural diagram of a motor control circuit provided in an embodiment of the present application;

fig. 2 is a schematic circuit structure diagram of a motor control circuit provided in an embodiment of the present application;

fig. 3 is a waveform diagram of an input power source before and after rectification according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a power supply circuit according to an embodiment of the present disclosure. As shown in fig. 1, the power supply circuit includes a power interface J1, a device interface J4, at least one load interface, a first switch module 10, a second switch module 20, a third switch module 30, a signal preprocessing module 40, and an energy storage module 50. In this embodiment, for example, the at least one load interface includes two load interfaces, namely a first load interface J2 and a second load interface J3.

Specifically, a first end of the power interface J1 is connected to a first end of the signal preprocessing module 40 and a first end of the third switch module 30, first ends of the first load interface J2 and the second load interface J3 are connected to a second end of the third switch module 30, a second end of the signal preprocessing module 40 is connected to a third end of the third switch module 30 and a first end of the first switch module 10, a second end of the first switch module 10 is connected to a first end of the device interface J4, a third end of the first switch module 10 is connected to a second end of the device interface J4, a fourth end of the first switch module 10 is connected to a first end of the energy storage module 50 and a first end of the second switch module 20, a second end of the second switch module 20 is connected to a fourth end of the third switch module 30, a second end of the power interface J1, a first load interface J2 and a second end of the second load interface J3, The third terminal of the signal preprocessing module 40, the second terminal of the energy storage module 50 and the third terminal of the second switching module 20 are all grounded GND.

The signal preprocessing module 40 is configured to preprocess the input power to output a first voltage when the power interface J1 is connected to the input power. The first switching module 10 is configured to be turned on according to a power supply provided by an external device when the device interface J4 is connected to the external device, so that the energy storage module 50 is charged by a first voltage. The second switching module 20 is configured to be turned on when the voltage across the energy storage module 50 is charged to a second voltage. The third switch module 30 is configured to form a loop with the first voltage and conduct when the second switch module 20 is conducted, so as to establish a connection between the first end of the power interface J1 and the first end of the load interface, and supply power to a load connected to the load interface according to the input power.

It is understood that, in an embodiment, the input power may be mains power with a voltage of 210V-220V and a frequency of 50Hz, or mains power with a voltage of 110V-120V and a frequency of 60 Hz. Also, in one embodiment, the device interface J1 may be a USB interface.

In practical applications, after the power interface J1 is connected to the input power, the device interface J4 is connected to the external device, and the first load interface J2 and/or the second load interface J3 is connected to the load, first, the first switch module 10 is turned on by the voltage provided by the external device. At this time, the input power outputs a first voltage after being preprocessed by the signal preprocessing module 40, and the first voltage charges the energy storage module 50 through the first switch module 10. When the voltage across the energy storage module 50 is charged to the second voltage, the second switch module 20 is turned on, the first voltage, the third switch module 30, and the second switch module 20 form a loop, and the third switch module 30 is turned on. The first terminal of the power interface J1 is connected to the first terminal of the first load interface J2 and the first terminal of the second load interface J3. Thus, the input power can supply power to the loads connected to the first load interface J2 and the second load interface J3 through the power interface J1.

It can be seen that, in this embodiment, if the device interface J4 is a USB interface, it is not necessary to match a corresponding charging plug or an existing conversion interface as in the related art, and power can be supplied to other devices, which is beneficial to reducing cost.

In an embodiment, referring to fig. 2 in conjunction with fig. 1, it is still exemplified that the at least one load interface includes a first load interface J2 and a second load interface J3. In this embodiment, the power supply circuit further includes a fifth resistor R5. A first end of the first load interface J2 is connected to a first end of the second load interface J3 and a second end of the third switch module 30, a second end of the first load interface J2 is connected to a second end of the second load interface J3 and a first end of the fifth resistor R5, and a second end of the fifth resistor R5 is grounded to GND.

In this embodiment, the fifth resistor R5 is a protection resistor. In particular, the fifth resistor R5 can perform the functions of isolating and limiting the current, and protect the power line connected to the second end of the power interface J1 from being damaged. For example, in an embodiment, when the power interface J1 is connected to the mains supply, and the second end of the power interface J1 is connected to a zero line of the mains supply, the fifth resistor R5 can protect the zero line from being damaged.

In one embodiment, the power supply circuit further comprises a key K1. A first end of the key K1 is connected to the first end of the signal preprocessing module 40, the first end of the first switch module 10, and the first end of the third switch module 30, and a second end of the key K1 is connected to the first end of the energy storage module 50, the fourth end of the first switch module 10, and the first end of the second switch module 20.

Specifically, when the key K1 is pressed, the first voltage charges the energy storage module 50 through the key K1. Then, when the voltage across the energy storage module 50 is charged to the second voltage, the second switching module 20 and the third switching module 30 are turned on. The first terminal of the power interface J1 is connected to the first terminal of the first load interface J2 and the first terminal of the second load interface J3. Thus, the input power can supply power to the loads connected to the first load interface J2 and the second load interface J3 through the power interface J1.

In an embodiment, the first switch module 10 includes an optical coupler U1, a third diode D3, and a third resistor R3, and the optical coupler U1 includes a light emitter and a light receiver. The first end of the light emitter (i.e., the 1 st pin of the optical coupler U1) is connected to the first end of the device interface J4 (i.e., the 1 st pin of the device interface J4) through a third resistor R3, the second end of the light emitter (i.e., the 2 nd pin of the optical coupler U1) is connected to the second end of the device interface J4 (i.e., the 2 nd pin of the device interface J4), the first end of the light receiver (i.e., the 3 rd pin of the optical coupler U1) is connected to the first end of the third switch module 30 and the second end of the signal preprocessing module 40, the second end of the light receiver (i.e., the 4 th pin of the optical coupler U1) is connected to the anode of the third diode D3, and the cathode of the third diode D3 is connected to the first end of the energy storage module 50 and the first end of the second switch module 20.

In this embodiment, when the device interface J4 is plugged into an external device, the external device can power the optocoupler U1 to enable the optocoupler U1. The optocoupler U1 also plays an isolation role to protect the device interface J4 and external devices from high-voltage electric shock. The third resistor R3 is used to limit the current.

In one embodiment, the second switch module 20 includes a switch Q1, a fourth resistor R4, and a second zener diode DW 2. A first end of the switching tube Q1 is connected to the first end of the energy storage module 50 and the fourth end of the first switching module 10 through a fourth resistor R4, a second end of the switching tube Q1 is grounded GND, and a first end of the switching tube Q1 is connected to the fourth end of the third switching module 30.

In this embodiment, the switching transistor Q1 is an NPN transistor, for example. Specifically, the first terminal of the switching transistor Q1 is a base of an NPN transistor, the second terminal of the switching transistor Q1 is an emitter of the NPN transistor, and the third terminal of the switching transistor Q1 is a collector of the NPN transistor.

In this embodiment, the fourth resistor R4 is used as a current-limiting resistor, and the second zener diode DW2 is used to protect the switching tube Q1, so as to prevent the switching tube Q1 from being damaged due to an excessive voltage.

In one embodiment, the third switching module 30 includes a relay RY and a fourth diode D4. One of a pair of normally open contacts S1 of the relay RY is connected to the first end of the power source interface J1, the other of the normally open contacts S1 is connected to the first end of the first load interface J2 and the first end of the second load interface J3, the anode of the fourth diode D4 is connected to the first end of the coil KM of the relay RY and the second end of the second switch module 20, and the cathode of the fourth diode D4 is connected to the second end of the coil KM of the relay RY, the second end of the signal preprocessing module 40 and the first end of the first switch module 10.

Specifically, when the switching tube Q1 is turned on, the coil KM of the relay RY is energized, the pair of normally open contacts S1 of the relay RY is closed, and the first end of the power source J1 is connected to the first end of the first load interface J2 and the first end of the second load interface J3. Thus, the input power can supply power to the loads connected to the first load interface J2 and the second load interface J3 through the power interface J1.

In one embodiment, the signal preprocessing module 40 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1, a second resistor R2, a first diode D1, a second diode D2, and a first zener diode DW 1. The first resistor R1 is connected in series with the second resistor R2, a circuit formed by the first resistor R1 and the second resistor R2 in series is connected in parallel with the first capacitor C1 and the second capacitor C2, a first end of the first capacitor C1 is connected to a first end of the power interface J1 (i.e., the first pin 1 of the power interface J1) and a first end of the third switch module 30, a second end of the first capacitor C1 is connected to an anode of the first diode D1 and a cathode of the second diode D2, a cathode of the first diode D1 is connected to a first end of the third capacitor C3, a cathode of the first voltage-stabilizing diode DW1, a third end of the third switch module 30 and a first end of the first switch module 10, a second end of the third capacitor C3, an anode of the second diode D2 and an anode of the first voltage-stabilizing diode DW1 are all grounded, and the third capacitor C3 is connected in parallel with the fourth capacitor C4 GND.

In this embodiment, the first capacitor C1 and the second capacitor C2 are step-down capacitors, wherein in one embodiment, the first capacitor C1 and the second capacitor C2 are film capacitors or CBB series capacitors (i.e., polypropylene capacitors). The first diode D1 is a half-wave rectifier diode. When the external input power is the commercial power, please refer to fig. 3, and a portion in fig. 3 is a waveform diagram of the commercial power. It can be seen that the alternating current in the mains supply is frequency and supplied in the form of a sine wave, wherein a positive half-wave form is above the abscissa and a negative half-wave form is below the abscissa, and both forms constitute a complete frequency waveform. By utilizing the diode unidirectional conduction characteristic, the diode is turned on when the anode voltage of the first diode D1 is greater than the cathode voltage, and is turned off when the cathode voltage is greater than the anode voltage, whereas the first diode D1 is turned off. Therefore, when the commercial power is in the positive half wave, the anode voltage of the first diode D1 is greater than the cathode voltage, the first diode D1 is turned on, and a forward voltage is given to the right; when the commercial power is in the negative half wave, the cathode voltage of the first diode D1 is greater than the anode voltage, and the first diode D1 is cut off. The mains waveform after passing through the first diode D1 is shown in part b of figure 3. The first resistor R1 and the second resistor R2 are loop bleeder resistors, and the second diode D2 is an important part of the circuit forming a bleeder loop. In addition, the current backflow phenomenon in the loop can be protected by utilizing the one-way conductivity of the second diode D2, and the first resistor R1 and the second resistor R2 can be prevented from being damaged due to impact. The third capacitor C3 and the fourth capacitor C4 form a filter capacitor. Since the voltage after passing through the first diode D1 is unstable before passing through the third capacitor C3 and the fourth capacitor C4, the subsequent system cannot operate stably because the stable voltage is not obtained. The first voltage after passing through the first diode D1 may be higher than 30 v before passing through the first zener diode DW1, and may fluctuate greatly as the load current changes. Therefore, the voltage rectified by the first diode D2 needs to pass through the first diode D1, the second diode D2 and the first zener diode DW1 to obtain a stable first voltage. The magnitude of the first voltage is determined by the regulated value of the first zener diode DW 1.

In one embodiment, the energy storage module 50 includes a fifth capacitor C5. A first end of the fifth capacitor C5 is connected to the fourth end of the first switch module 10 and the first end of the second switch module 20, and a second end of the fifth capacitor C5 is grounded to GND.

In particular, the fifth capacitor C5 may be used for charging or discharging. Then, the capacitance of the fifth capacitor C5 may be configured according to specific requirements to configure the charging time and the discharging time of the fifth capacitor C5, so as to implement the timing function through the charging time and the discharging time of the fifth capacitor C5. For example, in one embodiment, it is necessary to control the input power source to be able to supply power to the load after 100 seconds of connection of the external device, and at this time, it is only necessary to configure the capacitance value of the fifth capacitor C5 so that the time for charging the voltage of the fifth capacitor C5 to the voltage capable of turning on the second switch module 20 is configured to be 100 seconds.

Furthermore, the fifth capacitor C5 can also function to protect the system from harmful surges that may occur when the key K1 is pressed.

For a better understanding of the present application, the operation of the circuit shown in fig. 2 will be described below by way of example.

When the key K1 is pressed, the first voltage can charge the fifth capacitor C5. When the voltage across the fifth capacitor C5 is charged to be greater than the turn-on voltage of the switching transistor Q1, the switching transistor Q1 can be turned on. Then, the relay RY is charged, the pair of normally open contacts S1 of the relay RY is closed, and the first end of the power source interface J1 is connected to the first end of the first load interface J2 and the first end of the second load interface J3. The input power can supply power to a load (such as a television or an electronic product such as a set-top box) connected to the first load interface J2 and the second load interface J3 through the power interface J1.

When the device interface J4 is connected with an external device, the optocoupler U1 is enabled due to power supply of the external device. And the 3 rd pin and the 4 th pin of the optical coupler U1 are communicated. The first voltage charges a fifth capacitor C5 through a 3 rd pin and a 4 th pin of the optocoupler U1 and the third diode D3. Similarly, when the voltage across the fifth capacitor C5 is charged to be greater than the turn-on voltage of the switching tube Q1, the switching tube Q1 can be turned on. Then, the relay RY is electrified, the pair of normally open contacts S1 of the relay RY is closed, and the first end of the power interface J1 is connected with the first end of the first load interface J2 and the first end of the second load interface J3. The input power can supply power to a load (such as a television or an electronic product such as a set-top box) connected to the first load interface J2 and the second load interface J3 through the power interface J1. At this time, when the external device and the device interface J4 are disconnected, the fifth capacitor C5 discharges, and when the voltage of the fifth capacitor C5 discharges to be less than the on voltage of the switching tube Q1, the switching tube Q1 turns off, and the connection between the input power supply and the load is disconnected.

In this embodiment, if the device interface J4 is a USB interface, it is not necessary to match a corresponding charging plug or an existing conversion interface in the related art, and power can be supplied to other devices, which is beneficial to reducing cost. Secondly, when no load is supplied (for example, none of the load interfaces is connected to the load), the first terminals of the load interfaces and the first terminal of the power interface J1 can be kept disconnected, in which case, the power is not substantially lost, thereby being beneficial to low power.

In one embodiment, the device interface J4 is a USB interface, and the load connected by the device interface J4 is a television. And the first load interface J2 is connected to a remote control to supply power to the controller. The remote controller can be used for controlling the television to be turned on or turned off.

When the television is in an on state, the device interface J4 can supply power to the optocoupler U1, so that the input power supply can supply power to the remote controller through the first load interface J2. At this time, if the television is turned off by the remote controller, the optocoupler U1 also loses the power supply voltage, and the remote controller also loses power. Thus, the purpose of reducing the loss of electric energy can be achieved, i.e., low power consumption can be advantageously achieved.

The embodiment of the present application further provides an electronic device, which includes the power supply circuit in any embodiment of the present application.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; within the context of the present application, where technical features in the above embodiments or in different embodiments may also be combined, the steps may be implemented in any order and there are many other variations of the different aspects of the present application described above which are not provided in detail for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (5)

1. A power supply circuit, comprising:

the device comprises a power interface, an equipment interface, at least one load interface, a signal preprocessing module, a first switch module, a second switch module, a third switch module and an energy storage module;

the first end of the power interface is connected with the first end of the signal preprocessing module and the first end of the third switch module respectively, the first end of the load interface is connected with the second end of the third switch module, the second end of the signal preprocessing module is connected with the third end of the third switch module and the first end of the first switch module respectively, the second end of the first switch module is connected with the first end of the equipment interface, the third end of the first switch module is connected with the second end of the equipment interface, the fourth end of the first switch module is connected with the first end of the energy storage module and the first end of the second switch module respectively, the second end of the second switch module is connected with the fourth end of the third switch module, the second end of the power interface, the second end of the load interface and the third end of the signal preprocessing module, The second end of the energy storage module and the third end of the second switch module are both grounded;

the signal preprocessing module is used for preprocessing the input power supply to output a first voltage when the power supply interface is connected with the input power supply;

the first switch module is used for conducting according to a power supply provided by an external device when the device interface is connected with the external device, so that the energy storage module is charged by the first voltage;

the second switch module is used for being switched on when the voltage at the two ends of the energy storage module is charged to a second voltage;

the third switch module is used for forming a loop with the first voltage to be conducted when the second switch module is conducted so as to establish connection between the first end of the power interface and the first end of the load interface and supply power to a load connected with the load interface according to the input power;

the first switch module comprises an optical coupler, a third diode and a third resistor, wherein the optical coupler comprises a light emitter and a light receiver;

the first end of the light emitter is connected with the first end of the equipment interface through the third resistor, the second end of the light emitter is connected with the second end of the equipment interface, the first end of the light receiver is respectively connected with the first end of the third switch module and the second end of the signal preprocessing module, the second end of the light receiver is connected with the anode of the third diode, and the cathode of the third diode is respectively connected with the first end of the energy storage module and the first end of the second switch module;

the energy storage module comprises a fifth capacitor;

a first end of the fifth capacitor is connected with a fourth end of the first switch module and a first end of the second switch module, and a second end of the fifth capacitor is grounded;

the second switch module comprises a switch tube, a fourth resistor and a second voltage stabilizing diode;

the first end of the switch tube is respectively connected with the first end of the energy storage module and the fourth end of the first switch module through the fourth resistor, the second end of the switch tube is grounded, and the first end of the switch tube is connected with the fourth end of the third switch module;

the third switch module comprises a relay and a fourth diode;

one contact in a pair of normally open contacts of the relay is connected with the first end of the power interface, the other contact is connected with the first end of the load interface, the anode of the fourth diode is connected with the first end of the coil of the relay and the second end of the second switch module, and the cathode of the fourth diode is connected with the second end of the coil of the relay, the second end of the signal preprocessing module and the first end of the first switch module.

2. The power supply circuit according to claim 1, wherein the signal preprocessing module comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor, a first diode, a second diode and a first voltage regulator diode;

the first resistor is connected in series with the second resistor, a circuit formed by connecting the first resistor in series with the second resistor is connected in parallel with the first capacitor and the second capacitor, the first end of the first capacitor is connected with the first end of the power interface and the first end of the third switch module respectively, the second end of the first capacitor is connected with the anode of the first diode and the cathode of the second diode respectively, the cathode of the first diode is connected with the first end of the third capacitor, the cathode of the first voltage stabilizing diode, the third end of the third switch module and the first end of the first switch module respectively, the second end of the third capacitor, the anode of the second diode and the anode of the first voltage stabilizing diode are all grounded, and the third capacitor is connected in parallel with the fourth capacitor.

3. The power supply circuit of claim 1, wherein the power supply circuit further comprises a key;

the first end of the key is connected with the first end of the signal preprocessing module, the first end of the first switch module and the first end of the third switch module respectively, and the second end of the key is connected with the first end of the energy storage module, the fourth end of the first switch module and the first end of the second switch module respectively.

4. The power supply circuit according to any one of claims 1-3, wherein the at least one load interface comprises a first load interface and a second load interface, the power supply circuit further comprising a fifth resistor;

the first end of the first load interface is connected with the first end of the second load interface and the second end of the third switch module respectively, the second end of the first load interface is connected with the second end of the second load interface and the first end of the fifth resistor respectively, and the second end of the fifth resistor is grounded.

5. An electronic device, characterized in that it comprises a supply circuit according to any one of claims 1-4.

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