CN116667653A - Power supply circuit and power supply equipment - Google Patents

Abstract

The application discloses a power supply circuit and power supply equipment, wherein in the power supply circuit, a first rectifying circuit comprises an output end and at least one input end, and the input end of the first rectifying circuit is used for being connected with a power supply; one end of the first resistor is connected with the output end of the first rectifying circuit, and the other end of the first resistor is used for outputting a power supply signal; the relay circuit comprises a switch module and a coil module, wherein the switch module is connected with the first resistor in parallel, and one end of the coil module receives a first voltage signal; the power supply detection circuit outputs a third voltage signal when the power supply is powered on, and outputs a second voltage signal when the power supply is powered off; one end of the first capacitor is connected with the output end of the power supply detection circuit, and the other end of the first capacitor receives a second voltage signal; the driving end of the first switch module is connected with one end of the first capacitor, the first end of the first switch module is connected with the other end of the coil module, and the second end of the first switch module receives the second voltage signal. Based on the mode, the safety of the power supply circuit is improved.

Description

Power circuit and power supply equipment

technical field

This application relates to the field of electric power technology, in particular to power supply circuits and power supply equipment.

Background technique

In the prior art, the processing chip powered by the auxiliary power supply connected to the power circuit or the auxiliary power supply is usually used to control the switching of the relay used for surge protection in the power circuit, so as to realize the power supply connected to the power circuit (such as When the mains power supply) is powered on, the relay is turned off so that the power supply provides the power supply voltage to the power supply circuit through the corresponding resistance, and the current is limited through the resistance to avoid excessive surge current.

The defect of the prior art is that the above-mentioned auxiliary power supply usually continues to supply power when the power supply is powered off due to the presence of bus capacitance in the power supply circuit, so that the relay remains closed for a period of time. If the power supply is powered on again during this period of time, It is easy to cause the power supply circuit to generate a surge current because the relay is in a closed state when the power supply is just powered on, and damage the power supply circuit, making the safety of the existing power supply circuit poor.

Contents of the invention

The technical problem mainly solved by this application is how to improve the safety of the power supply circuit.

In order to solve the above technical problems, the first technical solution adopted by this application is: a power supply circuit, including: a first rectification circuit, the first rectification circuit includes an output terminal and at least one input terminal, the input terminal of the first rectification circuit is used For connecting the power supply; the first resistor, one end of the first resistor is connected to the output end of the first rectifier circuit, and the other end of the first resistor is used to output the power supply signal; the relay circuit, the relay circuit includes a relay switch module and a coil module, the relay The switch module is connected in parallel with the first resistor, and one end of the coil module receives the first voltage signal; the power supply detection circuit, the input end of the power supply detection circuit is connected to the power supply, and the power supply detection circuit is used to output the third voltage signal when the power supply is powered on, and when the power supply Outputting the second voltage signal when the power is off; the first capacitor, one end of the first capacitor is connected to the output end of the power detection circuit, and the other end of the first capacitor receives the second voltage signal; the first switch module, the driving end of the first switch module One end of the first capacitor is connected, the first end of the first switch module is connected to the other end of the coil module, the second end of the first switch module receives the second voltage signal, and the first switch module is used to receive a high level at the drive end The signal is turned on; the voltage of the first voltage signal is greater than the voltage of the second voltage signal, and the voltage of the third voltage signal is greater than the voltage of the second voltage signal.

Wherein, the power detection circuit includes: a second rectification circuit, the second rectification circuit includes an output terminal and at least one input terminal, and the input terminal of the second rectification circuit is used to connect the power supply; the second switch module and the first diode, the second The drive end of the switch module is respectively connected to the output end of the second rectifier circuit and the anode of the first diode, the first end of the second switch module is respectively connected to the cathode of the first diode and one end of the first capacitor, and the second switch The second terminal of the module receives a second voltage signal, and the second switch module is used to conduct when the driving terminal receives a low-level signal.

Wherein, the second rectification circuit includes: at least one second diode, the anode of the second diode is connected to an output terminal of the power supply, and the cathode of the second diode is connected to the anode of the first diode.

Wherein, the power detection circuit further includes: a second resistor, one end of the second resistor is connected to the output end of the second rectifier circuit, and the other end of the second resistor is connected to the anode of the first diode; a second capacitor, one end of the second capacitor The other end of the second resistor is connected, and the other end of the second capacitor receives the second voltage signal.

Wherein, the power detection circuit further includes: a third resistor, one end of the third resistor is connected to the other end of the second resistor, and the other end of the third resistor is connected to the anode of the first diode; a fourth resistor, one end of the fourth resistor is connected to The second end of the second switch module, the other end of the fourth resistor receives the second voltage signal; the fifth resistor, one end of the fifth resistor is connected to the driving end of the second switch module, and the other end of the fifth resistor receives the second voltage signal the sixth resistor, the sixth resistor is connected in parallel with the first capacitor; the third capacitor, one end of the third capacitor is connected to the driving end of the second switch module, and the other end of the third capacitor is connected to the first end of the second switch module.

Wherein, the power circuit further includes: a seventh resistor, one end of the seventh resistor is connected to one end of the coil module, and the other end of the seventh resistor receives the first voltage signal; a hysteresis circuit, the hysteresis circuit is connected to one end of the seventh resistor and the first voltage signal respectively. At one end of the capacitor, the hysteresis circuit is used to charge the first capacitor based on the first voltage signal when there is a voltage drop across the seventh resistor.

Wherein, the hysteresis circuit includes: a third switch module, the drive end of the third switch module is connected to one end of the seventh resistor, the first end of the third switch module is connected to the other end of the seventh resistor, and the third switch module is used for driving The end is turned on when receiving a low level signal; the eighth resistor, one end of the eighth resistor is connected to the second end of the third switch module, and the other end of the eighth resistor is connected to one end of the first capacitor.

Wherein, the first switch module includes a three-terminal adjustable voltage stabilizer; the input end of the three-terminal adjustable voltage stabilizer is the driving end of the first switch module, and the output end of the three-terminal adjustable voltage stabilizer is the driving end of the first switch module. The first end, the ground end of the three-terminal adjustable voltage regulator is the second end of the first switch module.

Wherein, the power circuit further includes: a bus capacitor, one end of the bus capacitor is connected to the other end of the first resistor, and the other end of the bus capacitor receives the second voltage signal; and/or, the power circuit further includes: a DC converter, the DC converter The input end is connected to the other end of the first resistor, and the output end of the DC converter is used to output the power supply signal after DC conversion; and/or, the relay circuit further includes a third diode, and the negative pole of the third diode is connected to the coil One end of the module, the anode of the third diode is connected to the other end of the coil module.

In order to solve the above-mentioned technical problem, the second technical solution adopted by the present application is: a power supply device, including the above-mentioned power supply circuit.

The beneficial effects of the present application are: different from the prior art, in the technical solution of the present application, by setting a power detection circuit and using the power detection circuit to detect the power supply, when the power supply is powered on, it outputs a third voltage signal, so as to To charge the first capacitor, when the voltage of the first capacitor does not reach a high level, the power supply can be connected to the first rectifier circuit through the first resistor to prevent the surge current from damaging the power circuit, and when the voltage of the first capacitor reaches When the level is high, the first terminal and the second terminal of the first switch module are turned on, so that the coil module in the relay circuit generates a magnetic field to attract the relay switch module to close, thereby bypassing the first resistor and improving the power output Efficiency, and when the power supply is powered off, it outputs the second voltage signal, which can quickly make the voltage of the first capacitor lower than the high level by discharging the first capacitor, and the first terminal and the second terminal of the first switch module Disconnect, so that the coil module in the relay circuit no longer generates a magnetic field, and the relay switch module is disconnected, so that the relay switch module can be disconnected quickly when the power is turned off, and the power supply is reduced when the relay switch module is not disconnected. Possibility to restore power on, improving the safety of the power circuit.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a schematic structural diagram of an embodiment of the power supply circuit of the present application;

Fig. 2 is a schematic structural diagram of another embodiment of the power supply circuit of the present application;

Fig. 3 is a schematic structural diagram of an embodiment of the power supply device of the present application.

Among them: the first rectifier circuit 101, the first resistor 102, the relay circuit 103, the relay switch module 1031, the coil module 1032, the power detection circuit 104, the second switch module 1041, the first diode 1042, the second diode 1043, second resistor 1044, second capacitor 1045, third resistor 1046, fourth resistor 1047, fifth resistor 1048, sixth resistor 1049, third capacitor 1050, first capacitor 105, first switch module 106, seventh Resistor 107 , hysteresis circuit 108 , third switch module 1081 , eighth resistor 1082 , bus capacitor 109 , DC converter 110 , third diode 111 , power supply device 20 , and power supply circuit 21 .

Detailed ways

The application will be described in further detail below in conjunction with the accompanying drawings and embodiments. In particular, the following examples are only used to illustrate the present application, but not to limit the scope of the present application. Likewise, the following embodiments are only some of the embodiments of the present application but not all of them, and all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of this application, what needs to be explained is that, unless otherwise clearly stipulated and limited, the terms "installation", "setting", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, it can be a Detachable connection, or integral connection; it can be mechanically connected or electrically connected; it can be directly connected or connected at intervals through an intermediate medium. For those skilled in the art, the above-mentioned specific meanings belonging to the present application can be connected in specific situations.

This application firstly proposes a power supply circuit, referring to Fig. 1, Fig. 1 is a schematic structural diagram of an embodiment of the power supply circuit of the present application, as shown in Fig. 1, the power supply circuit includes a first rectifier circuit 101, a first resistor 102, a relay circuit 103 . A power detection circuit 104 , a first capacitor 105 and a first switch module 106 .

The first rectification circuit 101 includes an output terminal and at least one input terminal, and the input terminal of the first rectification circuit 101 is used for connecting a power supply.

Wherein, the first rectification circuit 101 may specifically be a rectification and filtering circuit, or other types of rectification circuits capable of performing rectification processing based on a voltage signal input by a power supply to obtain a corresponding DC voltage signal, which is not limited herein.

One end of the first resistor 102 is connected to the output end of the first rectifier circuit 101 , and the other end of the first resistor 102 is used for outputting a power supply signal.

Wherein, the first resistor 102 can be used to limit the input current of the power supply circuit when the power supply of the power supply circuit is just powered on, thereby reducing the possibility of generating an excessive surge current in the power supply circuit when the power supply is just powered on , thereby reducing the possibility of damage to the power supply circuit due to inrush current.

The relay circuit 103 includes a relay switch module 1031 and a coil module 1032, the relay switch module 1031 is connected in parallel with the first resistor 102, and one end of the coil module 1032 receives the first voltage signal.

Wherein, the relay circuit 103 can be used to make the first resistor 102 play a role of current limiting when the relay switch module 1031 is turned off, and make the first resistor 102 be bypassed when the relay switch module 1031 is turned on, thereby improving The operating efficiency of the power circuit.

The input terminal of the power detection circuit 104 is connected to the power supply, and the power detection circuit 104 is used for outputting the third voltage signal when the power supply is turned on, and outputting the second voltage signal when the power supply is turned off. One end of the first capacitor 105 is connected to the output end of the power detection circuit 104, and the other end of the first capacitor 105 receives the second voltage signal.

Wherein, the voltage of the third voltage signal is greater than the voltage of the second voltage signal. The power detection circuit 104 can output a third voltage signal to charge the first capacitor 105 to increase the voltage on the first capacitor 105 when the power is in a power-on state.

The drive end of the first switch module 106 is connected to one end of the first capacitor 105, the first end of the first switch module 106 is connected to the other end of the coil module 1032, and the second end of the first switch module 106 receives the second voltage signal. The switch module 106 is used for conducting when the driving end receives a high level signal.

Wherein, the voltage of the first voltage signal is greater than the voltage of the second voltage signal. The first switch module 106 can be used to enable the other end of the coil module 1032 to receive the second voltage by turning on its first end and second end when the voltage of the first capacitor 105 reaches a preset voltage threshold due to the above charging process signal, because one end of the coil module 1032 receives the first voltage signal whose voltage is greater than the voltage of the second voltage signal, it can cause a corresponding current to appear in the coil module 1032, thereby forming a magnetic field, and attracting the relay switch module 1031 to make it closure.

It should be noted that, as shown in FIG. 1 , the first voltage signal may refer to VCC, and the second voltage signal may refer to GND, wherein VCC may be specifically connected to the other end of the first resistor 102 for power supply. The module that performs DC conversion processing on the signal, the voltage signal output after the DC conversion, may also be a voltage signal provided by other methods, which is not limited here.

Different from the prior art, in the technical solution of the present application, by setting a power detection circuit and using the power detection circuit to detect the power supply, when the power supply is powered on, it outputs a third voltage signal to charge the first capacitor, When the voltage of the first capacitor does not reach a high level, the power supply can be connected to the first rectifier circuit through the first resistor to prevent the surge current from damaging the power supply circuit, and when the voltage of the first capacitor reaches a high level, the first The first end and the second end of the switch module are turned on, so that the coil module in the relay circuit generates a magnetic field to attract the relay switch module to close, thereby bypassing the first resistor, improving the output efficiency of the power supply, and when the power is turned off , make it output the second voltage signal, and quickly make the voltage of the first capacitor lower than the high level by discharging the first capacitor, and the first terminal and the second terminal of the first switch module are disconnected, thereby making the relay circuit The coil module in the coil no longer generates a magnetic field, and the relay switch module is disconnected, so that the relay switch module can be disconnected quickly when the power is turned off, reducing the possibility of power recovery before the relay switch module is disconnected. The safety of the power circuit is improved.

In one embodiment, the power detection circuit 104 includes a second rectification circuit, a second switch module 1041 and a first diode 1042 .

The second rectification circuit includes an output terminal and at least one input terminal, and the input terminal of the second rectification circuit is used for connecting to a power supply.

The driving end of the second switch module 1041 is respectively connected to the output end of the second rectifier circuit and the anode of the first diode 1042, and the first end of the second switch module 1041 is respectively connected to the cathode of the first diode 1042 and the first capacitor 105 , the second end of the second switch module 1041 receives the second voltage signal, and the second switch module 1041 is used to conduct when the drive end receives a low level signal.

Specifically, the second rectification circuit can convert the single-phase alternating current or three-phase alternating current input by the power supply into direct current, so as to input to the driving terminal of the second switch module 1041 .

When the power supply is powered on, since the second switch module 1041 will be turned off when the drive end receives a high-level signal, the power supply can provide a third voltage signal to one end of the first capacitor 105 through the first diode 1042, that is, The power supply can charge the first capacitor 105 through the first diode 1042 .

And when the power is off, because the second switch module 1041 will be turned on when the drive end receives a low-level signal, the second switch module 1041 can provide a second voltage signal to one end of the first capacitor 105, that is, the first The capacitor 105 can be discharged through the circuit turned on by the second switch module 1041 .

Based on the above method, the above power detection circuit 104 can be constructed by the second switch module 1041 and the first diode 1042, which has the characteristics of simple structure and fast response speed, and improves the reliability of the power circuit.

In addition, the second rectifier circuit may specifically include at least one second diode 1043, the anode of the second diode 1043 is connected to an output terminal of the power supply, and the cathode of the second diode 1043 is connected to the anode of the first diode 1042 .

For example, the power supply is a single-phase AC power supply, and the number of the second diode 1043 is one. The anode of the second diode 1043 is connected to the neutral wire or the live wire of the power supply for half-wave rectification. As shown in FIG. 1 , the power supply is a two-phase AC power supply, and there are two second diodes 1043 , and the anode of each second diode 1043 is respectively connected to a corresponding output line of the power supply. As shown in FIG. 2 , the power supply is a three-phase AC power supply (such as a commercial power supply), and there are three second diodes 1043 , and the anodes of each second diode 1043 are respectively connected to corresponding output lines of the power supply.

Optionally, the power detection circuit 104 further includes a second resistor 1044 and a second capacitor 1045 .

One end of the second resistor 1044 is connected to the output end of the second rectifier circuit, and the other end of the second resistor 1044 is connected to the anode of the first diode 1042 .

One end of the second capacitor 1045 is connected to the other end of the second resistor 1044, and the other end of the second capacitor 1045 receives the second voltage signal.

Specifically, a filter circuit can be constructed through the second resistor 1044 and the second capacitor 1045. Based on the above method, when the power supply is a single-phase AC power supply, the zero-crossing characteristics of the single-phase AC power can be reduced, causing the relay switch module in the relay circuit to 1031 is repeatedly attracted or released by the coil module 1032, so that the relay switch module 1031 may be repeatedly turned on and off, thereby improving the safety of the power circuit.

Further, the power detection circuit 104 also includes a third resistor 1046 , a fourth resistor 1047 , a fifth resistor 1048 , a sixth resistor 1049 and a third capacitor 1050 .

One end of the third resistor 1046 is connected to the other end of the second resistor 1044 , and the other end of the third resistor 1046 is connected to the anode of the first diode 1042 .

One end of the fourth resistor 1047 is connected to the second end of the second switch module 1041, and the other end of the fourth resistor 1047 receives the second voltage signal.

One end of the fifth resistor 1048 is connected to the driving end of the second switch module 1041 , and the other end of the fifth resistor 1048 receives the second voltage signal.

The sixth resistor 1049 is connected in parallel with the first capacitor 105 .

One end of the third capacitor 1050 is connected to the driving end of the second switch module 1041 , and the other end of the third capacitor 1050 is connected to the first end of the second switch module 1041 .

Specifically, by setting the above-mentioned third resistor 1046 and sixth resistor 1049, and adjusting the resistance of the two resistors appropriately, the final voltage that the first capacitor 105 can reach after the power is turned on can be regulated, By making the finally achievable voltage slightly greater than the voltage that can drive the first switch module 106 to be turned on, the relay switch module 1031 can be disconnected quickly after the power is turned off, further reducing the power supply before the relay switch module is disconnected. The possibility of resuming power on at any time improves the safety of the power circuit.

By setting the above-mentioned fourth resistor 1047, the possibility of damage to the second switch module 1041 caused by the excessive current when the first capacitor 105 is discharged can be reduced, thereby improving the safety of the power circuit.

By setting the above-mentioned fifth resistor 1048 and setting an appropriate resistance value, the possibility of damage to the second switch module 1041 due to the excessive voltage received by the driving terminal can be reduced, and the safety of the power circuit is improved.

By setting the third capacitor 1050, it can protect the first diode 1042 and improve the safety of the power supply circuit.

In an embodiment, the power circuit further includes a seventh resistor 107 and a hysteresis circuit 108 .

One end of the seventh resistor 107 is connected to one end of the coil module 1032 , and the other end of the seventh resistor 107 receives the first voltage signal.

The hysteresis circuit 108 is respectively connected to one end of the seventh resistor 107 and one end of the first capacitor 105, and the hysteresis circuit 108 is used to transfer the voltage to the first capacitor 105 based on the first voltage signal when there is a voltage drop across the seventh resistor 107. Charge.

Specifically, based on the above method, when the power is turned on, the other end of the coil module 1032 receives the second voltage signal to form a loop, so that a voltage drop occurs at both ends of the seventh resistor 107, thereby triggering the hysteresis circuit 108 based on The first voltage signal charges the first capacitor 105 to ensure that the voltage of the first capacitor 105 is high enough to act as a hysteresis, reducing the repeated disconnection of the relay switch module 1031 caused by the repeated rise and fall of the voltage of the first capacitor 105 And the possibility of conduction improves the reliability of the power circuit.

Optionally, the hysteresis circuit 108 includes a third switch module 1081 and an eighth resistor 1082 .

The drive end of the third switch module 1081 is connected to one end of the seventh resistor 107, the first end of the third switch module 1081 is connected to the other end of the seventh resistor 107, and the third switch module 1081 is used to receive a low level signal at the drive end time conduction.

One end of the eighth resistor 1082 is connected to the second end of the third switch module, and the other end of the eighth resistor 1082 is connected to one end of the first capacitor 105 .

Specifically, based on the above method, when a voltage drop occurs across both ends of the seventh resistor 107, the driving end of the third switch module 1081 can be turned on after receiving a low-level signal, and then the first voltage signal can be based on the first voltage signal. Capacitor 105 is used for charging, the circuit structure is simple, the response speed is fast, and the reliability of the power supply circuit is improved.

In one embodiment, the first switch module 106 includes a three-terminal adjustable voltage regulator.

The input end of the three-terminal adjustable voltage regulator is the driving end of the first switch module 106, the output end of the three-terminal adjustable voltage regulator is the first end of the first switch module 106, and the grounding of the three-terminal adjustable voltage regulator is Terminal is the second terminal of the first switch module 106 .

Specifically, the three-terminal adjustable voltage regulator may specifically include a TL431 type chip.

Based on the above method, the response speed of the first switch module 106 can be improved, thereby improving the reliability of the power circuit.

In one embodiment, the power supply circuit also includes:

The bus capacitor 109, one end of the bus capacitor 109 is connected to the other end of the first resistor 102, and the other end of the bus capacitor 109 receives the second voltage signal.

And/or, the power supply circuit also includes:

A DC converter 110 , the input end of the DC converter 110 is connected to the other end of the first resistor 102 , and the output end of the DC converter 110 is used to output a power supply signal after DC conversion.

And/or, the relay circuit 103 further includes a third diode 111 , the cathode of the third diode 111 is connected to one end of the coil module 1032 , and the anode of the third diode 111 is connected to the other end of the coil module 1032 .

Specifically, the stability of the final power supply signal VOUT output by the power supply circuit can be improved by setting the above-mentioned bus capacitor 109 .

By setting the DC converter 110 above, the power supply signal can be DC-converted to obtain a voltage signal of any amplitude, such as the first voltage signal and/or the second voltage signal.

By setting the above-mentioned third diode 111, the possibility that the current in the coil module 1032 changes sharply due to lack of receiving the second voltage signal, resulting in damage to the circuit due to overvoltage, improves the reliability of the power supply circuit.

In an application scenario, the above-mentioned DC converter 110 may be replaced with other converters, such as Buck converter, forward converter, flyback converter, half-bridge converter, full-bridge converter, and LLC converter.

And/or, VCC can specifically be any value in +5V, +12V, +24V, +48V and other amplitudes.

And/or, the second diode 1043 may be a high voltage diode.

And/or, the first diode 1042 and the third diode 111 may be low voltage diodes.

And/or, the first resistor 102 can be a power resistor or an NTC (Negative Temperature Coefficient, negative temperature coefficient) thermistor or a PTC (Positive Temperature Coefficient, positive temperature coefficient) thermistor, and in the power supply circuit except the first resistor 102 The resistors can be chip resistors.

The second capacitor 1045 may be a capacitor with a withstand voltage above 100V, and the capacitors in the power supply circuit other than the second capacitor 1045 may be chip capacitors.

The present application also proposes a power supply device, see FIG. 3, which is a schematic structural diagram of an embodiment of the power supply device of the present application. As shown in FIG. 3, the power supply device 20 includes a power supply circuit 21, and the power supply circuit 21 can be any The power supply circuit described in the embodiment will not be repeated here.

Different from the prior art, in the technical solution of the present application, by setting a power detection circuit and using the power detection circuit to detect the power supply, when the power supply is powered on, it outputs a third voltage signal to charge the first capacitor, When the voltage of the first capacitor does not reach a high level, the power supply can be connected to the first rectifier circuit through the first resistor to prevent the surge current from damaging the power supply circuit, and when the voltage of the first capacitor reaches a high level, the first The first end and the second end of the switch module are turned on, so that the coil module in the relay circuit generates a magnetic field to attract the relay switch module to close, thereby bypassing the first resistor, improving the output efficiency of the power supply, and when the power is turned off , make it output the second voltage signal, and quickly make the voltage of the first capacitor lower than the high level by discharging the first capacitor, and the first terminal and the second terminal of the first switch module are disconnected, thereby making the relay circuit The coil module in the coil no longer generates a magnetic field, and the relay switch module is disconnected, so that the relay switch module can be disconnected quickly when the power is turned off, reducing the possibility of power recovery before the relay switch module is disconnected. The safety of the power circuit is improved.

In the description of this application, reference to the terms "one embodiment," "some embodiments," "example," "specific examples," or "some examples" means that specific features described in connection with that embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

Any process or method descriptions in flowcharts or otherwise described herein may be understood to represent modules, segments or portions of code comprising one or more executable instructions for implementing specific logical functions or steps of the process , and the scope of preferred embodiments of the present application includes additional implementations in which functions may be performed out of the order shown or discussed, including in substantially simultaneous fashion or in reverse order depending on the functions involved, which shall It should be understood by those skilled in the art to which the embodiments of the present application belong.

The logic and/or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium, For the use of instruction execution systems, devices or equipment (which may be personal computers, servers, network equipment or other systems that can fetch instructions from instruction execution systems, devices or devices and execute instructions), or in combination with these instruction execution systems, devices or devices And use. For the purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use in or in conjunction with an instruction execution system, device or device. More specific examples (non-exhaustive list) of computer-readable media include the following: electrical connection with one or more wires (electronic device), portable computer disk case (magnetic device), random access memory (RAM), Read Only Memory (ROM), Erasable and Editable Read Only Memory (EPROM or Flash Memory), Fiber Optic Devices, and Portable Compact Disc Read Only Memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program can be printed, as it may be possible, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or other suitable processing if necessary. The program is processed electronically and stored in computer memory.

The above is only the implementation of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent process conversion made by using the specification and drawings of the application, or directly or indirectly used in other related technologies fields, are all included in the scope of patent protection of this application in the same way.

Claims (10)

1. A power supply circuit, characterized in that, comprising: A first rectification circuit, the first rectification circuit includes an output terminal and at least one input terminal, and the input terminal of the first rectification circuit is used to connect to a power supply; a first resistor, one end of the first resistor is connected to the output end of the first rectifier circuit, and the other end of the first resistor is used to output a power supply signal; a relay circuit, the relay circuit includes a relay switch module and a coil module, the relay switch module is connected in parallel with the first resistor, and one end of the coil module receives a first voltage signal; A power detection circuit, the input terminal of the power detection circuit is connected to the power supply, the power detection circuit is used to output a third voltage signal when the power supply is powered on, and output a second voltage signal when the power supply is powered off ; a first capacitor, one end of the first capacitor is connected to the output end of the power detection circuit, and the other end of the first capacitor receives the second voltage signal; A first switch module, the driving end of the first switch module is connected to one end of the first capacitor, the first end of the first switch module is connected to the other end of the coil module, and the first end of the first switch module is connected to the other end of the coil module. The two terminals receive the second voltage signal, and the first switch module is configured to conduct when the driving terminal receives a high-level signal; The voltage of the first voltage signal is greater than the voltage of the second voltage signal, and the voltage of the third voltage signal is greater than the voltage of the second voltage signal. 2. The power supply circuit according to claim 1, wherein the power detection circuit comprises: a second rectification circuit, the second rectification circuit includes an output terminal and at least one input terminal, and the input terminal of the second rectification circuit is used to connect to the power supply; The second switch module and the first diode, the drive terminal of the second switch module is respectively connected to the output terminal of the second rectifier circuit and the anode of the first diode, and the first diode of the second switch module One end is respectively connected to the cathode of the first diode and one end of the first capacitor, the second end of the second switch module receives the second voltage signal, and the second switch module is used to drive It turns on when receiving a low-level signal. 3. The power supply circuit according to claim 2, wherein the second rectification circuit comprises: At least one second diode, the anode of the second diode is connected to an output terminal of the power supply, and the cathode of the second diode is connected to the anode of the first diode. 4. The power circuit according to claim 2 or 3, wherein the power detection circuit further comprises: a second resistor, one end of the second resistor is connected to the output end of the second rectifier circuit, and the other end of the second resistor is connected to the anode of the first diode; A second capacitor, one end of the second capacitor is connected to the other end of the second resistor, and the other end of the second capacitor receives the second voltage signal. 5. The power circuit according to claim 4, wherein the power detection circuit further comprises: a third resistor, one end of the third resistor is connected to the other end of the second resistor, and the other end of the third resistor is connected to the anode of the first diode; A fourth resistor, one end of the fourth resistor is connected to the second end of the second switch module, and the other end of the fourth resistor receives the second voltage signal; A fifth resistor, one end of the fifth resistor is connected to the driving end of the second switch module, and the other end of the fifth resistor receives the second voltage signal; a sixth resistor, the sixth resistor is connected in parallel with the first capacitor; A third capacitor, one end of the third capacitor is connected to the driving end of the second switch module, and the other end of the third capacitor is connected to the first end of the second switch module. 6. The power supply circuit according to claim 1, wherein the power supply circuit further comprises: A seventh resistor, one end of the seventh resistor is connected to one end of the coil module, and the other end of the seventh resistor receives the first voltage signal; a hysteresis circuit, the hysteresis circuit is respectively connected to one end of the seventh resistor and one end of the first capacitor, and the hysteresis circuit is used to, based on the voltage drop between the two ends of the seventh resistor, The first voltage signal charges the first capacitor. 7. The power supply circuit according to claim 6, wherein the hysteresis circuit comprises: The third switch module, the drive end of the third switch module is connected to one end of the seventh resistor, the first end of the third switch module is connected to the other end of the seventh resistor, and the third switch module uses It is turned on when the drive end receives a low-level signal; An eighth resistor, one end of the eighth resistor is connected to the second end of the third switch module, and the other end of the eighth resistor is connected to one end of the first capacitor. 8. The power circuit according to claim 1, wherein the first switch module comprises a three-terminal adjustable voltage regulator; The input end of the three-terminal adjustable voltage regulator is the driving end of the first switch module, the output end of the three-terminal adjustable voltage regulator is the first end of the first switch module, and the three-terminal adjustable voltage regulator is the first end of the first switch module. The ground terminal of the terminal adjustable voltage regulator is the second terminal of the first switch module. 9. The power supply circuit according to claim 1, wherein the power supply circuit further comprises: a bus capacitor, one end of the bus capacitor is connected to the other end of the first resistor, and the other end of the bus capacitor receives the second voltage signal; And/or, the power supply circuit also includes: A DC converter, the input end of the DC converter is connected to the other end of the first resistor, and the output end of the DC converter is used to output the power supply signal after DC conversion; And/or, the relay circuit further includes a third diode, the cathode of the third diode is connected to one end of the coil module, and the anode of the third diode is connected to the other end of the coil module . 10. A power supply device, comprising the power supply circuit according to any one of claims 1 to 9.