Power supply circuit and power supply device

Abstract

The application discloses a power supply circuit and a power supply device. In the power supply circuit, a first rectifier circuit comprises an output end and at least one input end, and the input end of the first rectifier circuit is used for connecting a power supply; one end of a first resistor is connected to the output end of the first rectifier circuit, and the other end of the first resistor is used for outputting a power supply signal; a relay circuit comprises a switch module and a coil module, the switch module is connected in parallel with the first resistor, and one end of the coil module receives a first voltage signal; a 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 a first capacitor is connected to the output end of the power supply detection circuit, and the other end of the first capacitor receives the second voltage signal; a driving end of a first switch module is connected to one end of the first capacitor, a first end of the first switch module is connected to the other end of the coil module, and a second end of the first switch module receives the second voltage signal. Based on the above mode, the safety of the power supply circuit is improved.

Description

TECHNICAL FIELD

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

[0002] In the prior art, a processing chip is usually powered by an auxiliary power supply connected to a power supply circuit, or the auxiliary power supply is directly used to switch control a relay in the power supply circuit for surge protection, so as to make the relay open when the power supply connected to the power supply circuit (such as a mains power supply) is powered on, so that the power supply provides a power supply voltage to the power supply circuit through a corresponding resistor, and the current is limited through the resistor to avoid generating a large surge current.

[0003] The defect of the prior art is that the above-mentioned auxiliary power supply will continue to supply power when the power supply is powered off due to the existence of a bus capacitor in the power supply circuit, so that the relay remains closed for a period of time, and if the power supply is powered on again during this period of time, the power supply circuit will generate a surge current due to the relay being in a closed state when the power supply is just powered on, which will damage the power supply circuit, and the safety of the existing power supply circuit is poor. SUMMARY

[0004] The technical problem solved by the present application is how to improve the safety of the power supply circuit.

[0005] To solve the above technical problem, the first technical solution adopted by the present application is a power supply circuit, comprising: a first rectifier circuit, the first rectifier circuit comprising an output end and at least one input end, the input end of the first rectifier circuit being used to connect a power supply; a first resistor, one end of the first resistor being connected to the output end of the first rectifier circuit, and the other end of the first resistor being used to output a power supply signal; a relay circuit, the relay circuit comprising a relay switch module and a coil module, the relay switch module being connected in parallel with the first resistor, and one end of the coil module receiving a first voltage signal; a power supply detection circuit, the input end of the power supply detection circuit being connected to the power supply, the power supply detection circuit being 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 being connected to the output end of the power supply detection circuit, and the other end of the first capacitor receiving the second voltage signal; and a first switch module, the driving end of the first switch module being connected to one end of the first capacitor, the first end of the first switch module being connected to the other end of the coil module, and the second end of the first switch module receiving the second voltage signal, the first switch module being used to conduct when the driving end receives a high-level signal; the voltage of the first voltage signal being greater than the voltage of the second voltage signal, and the voltage of the third voltage signal being greater than the voltage of the second voltage signal.

[0006] The power supply detection circuit comprises a second rectifier circuit, a second switch module and a first diode.

[0007] The second rectifier circuit comprises at least one second diode.

[0008] The power supply detection circuit further comprises a second resistor, a second capacitor and a third resistor.

[0009] The power supply detection circuit further comprises a fourth resistor, a fifth resistor, a sixth resistor and a third capacitor.

[0010] The power supply circuit further comprises a seventh resistor and a hysteresis circuit.

[0011] The hysteresis circuit comprises a third switch module and an eighth resistor.

[0012] The first switch module comprises a three-terminal adjustable voltage regulator; an input end of the three-terminal adjustable voltage regulator is a driving end of the first switch module, an output end of the three-terminal adjustable voltage regulator is a first end of the first switch module, and a grounding end of the three-terminal adjustable voltage regulator is a second end of the first switch module.

[0013] 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 further comprises a direct current converter, an input end of the direct current converter is connected to the other end of the first resistor, and an output end of the direct current converter is used to output a power supply signal after direct current conversion; and / or the relay circuit further comprises a third diode, a negative electrode of the third diode is connected to one end of the coil module, and a positive electrode of the third diode is connected to the other end of the coil module.

[0014] To solve the above technical problems, a second technical solution adopted by the present application is a power supply device comprising the above power supply circuit.

[0015] The beneficial effects of the present application are as follows: Different from the prior art, in the technical solution of the present application, the power supply detection circuit is arranged and used to detect the power supply, when the power supply is powered on, the third voltage signal is outputted to charge the first capacitor, when the voltage of the first capacitor does not reach the 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 the high level, the first end and the second end 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 make it closed, thereby bypassing the first resistor and improving the power supply output efficiency; when the power supply is powered off, the second voltage signal is outputted, the first capacitor is discharged, the voltage of the first capacitor is rapidly lowered below the high level, the first end and the second end of the first switch module are disconnected, so that the coil module in the relay circuit no longer generates a magnetic field, the relay switch module is disconnected, and the relay switch module can be rapidly disconnected when the power supply is powered off, the possibility of the power supply being powered on again when the relay switch module has not been disconnected is reduced, and the safety of the power supply circuit is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0017] Figure 1 is a structural schematic diagram of an embodiment of the power supply circuit of the present application;

[0018] Figure 2 is a structural schematic diagram of another embodiment of the power supply circuit of the present application;

[0019] Figure 3 is a structural schematic diagram of an embodiment of the power supply device of the present application.

[0020] Wherein: the first rectifier circuit 101, the first resistor 102, the relay circuit 103, the relay switch module 1031, the coil module 1032, the power supply detection circuit 104, the second switch module 1041, the first diode 1042, the second diode 1043, the second resistor 1044, the second capacitor 1045, the third resistor 1046, the fourth resistor 1047, the fifth resistor 1048, the sixth resistor 1049, the third capacitor 1050, the first capacitor 105, the first switch module 106, the seventh resistor 107, the hysteresis circuit 108, the third switch module 1081, the eighth resistor 1082, the bus capacitor 109, the DC converter 110, the third diode 111, the power supply device 20, the power supply circuit 21. DETAILED DESCRIPTION

[0021] The present application will be further described below in conjunction with the drawings and embodiments. It is particularly pointed out that the following embodiments are only for illustrating the present application, but not for limiting the scope of the present application. Similarly, the following embodiments are only part of the embodiments of the present application, but not all the embodiments of the present application, and all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of the present application.

[0022] In this paper, the "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0023] In the description of the present application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be connected through an intermediate medium. For those skilled in the art, the above-mentioned specific meanings can be connected according to the specific circumstances.

[0024] The present application first proposes a power supply circuit, as shown in Figure 1 , Figure 1 is a structural schematic diagram of an embodiment of the power supply circuit of the present application, as shown inFigure 1 As shown, the power supply circuit includes a first rectifier circuit 101, a first resistor 102, a relay circuit 103, a power supply detection circuit 104, a first capacitor 105 and a first switch module 106.

[0025] The first rectifier circuit 101 includes an output end and at least one input end, and the input end of the first rectifier circuit 101 is used to connect the power supply.

[0026] The first rectifier circuit 101 can be a rectifier filter circuit or other types of rectifier circuits capable of rectifying the voltage signal of the power supply input to obtain a corresponding direct current voltage signal, which is not limited here.

[0027] 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 to output a power supply signal.

[0028] 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 a large inrush current in the power supply circuit when the power supply is just powered on, and further reducing the possibility of damaging the power supply circuit due to the inrush current.

[0029] 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.

[0030] The relay circuit 103 can be used to make the first resistor 102 play a role in current limiting when the relay switch module 1031 is disconnected, and make the first resistor 102 be bypassed when the relay switch module 1031 is turned on, thereby improving the working efficiency of the power supply circuit.

[0031] The input end of the power supply detection circuit 104 is connected to the power supply, and the power supply detection circuit 104 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. One end of the first capacitor 105 is connected to the output end of the power supply detection circuit 104, and the other end of the first capacitor 105 receives the second voltage signal.

[0032] The voltage of the third voltage signal is greater than the voltage of the second voltage signal. The power supply detection circuit 104 can output the third voltage signal when the power supply is in the powered-on state to charge the first capacitor 105, thereby increasing the voltage on the first capacitor 105.

[0033] The driving 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 first switch module 106 is used to turn on when the driving end receives a high-level signal.

[0034] The voltage of the first voltage signal is greater than the voltage of the second voltage signal. When the voltage of the first capacitor 105 reaches the preset voltage threshold value due to the above charging process, the first switch module 106 can be used to make the other end of the coil module 1032 receive the second voltage signal by turning on the first end and the second end. Since one end of the coil module 1032 receives the first voltage signal with a voltage greater than the voltage of the second voltage signal, a corresponding current can be generated in the coil module 1032, thereby forming a magnetic field to attract the relay switch module 1031 and make it closed.

[0035] It should be noted that, as shown in Figure 1 The first voltage signal can be VCC, and the second voltage signal can be GND. Specifically, VCC can be a module connected to the other end of the first resistor 102 for direct current conversion of the power supply signal. The voltage signal output after direct current conversion can also be a voltage signal provided in other ways, which is not limited here.

[0036] Compared with the prior art, in the technical solution of the present application, a power supply detection circuit is provided and used to detect the power supply. When the power supply is powered on, the third voltage signal is output to charge the first capacitor. When the voltage of the first capacitor does not reach the 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. When the voltage of the first capacitor reaches the high level, the first end and the second end of the first switch module are turned on, thereby generating a magnetic field in the coil module of the relay circuit to attract the relay switch module to make it closed, thereby bypassing the first resistor and improving the power supply output efficiency. When the power supply is powered off, the second voltage signal is output, the first capacitor is discharged, the voltage of the first capacitor is quickly lowered below the high level, the first end and the second end of the first switch module are disconnected, and the coil module in the relay circuit no longer generates a magnetic field. The relay switch module is disconnected, so that the relay switch module can be quickly disconnected when the power supply is powered off, reducing the possibility of the power supply recovering power when the relay switch module has not been disconnected, and improving the safety of the power supply circuit.

[0037] In an embodiment, the power supply detection circuit 104 includes a second rectifier circuit, a second switch module 1041, and a first diode 1042.

[0038] The second rectifying circuit includes an output end and at least one input end, and the input end of the second rectifying circuit is configured to be connected to the power supply.

[0039] The driving end of the second switch module 1041 is connected to the output end of the second rectifying circuit and the anode of the first diode 1042, the first end of the second switch module 1041 is connected to the cathode of the first diode 1042 and one end of the first capacitor 105, and the second end of the second switch module 1041 receives the second voltage signal, and the second switch module 1041 is configured to be turned on when the driving end receives a low-level signal.

[0040] Specifically, the second rectifying circuit can convert single-phase alternating current or three-phase alternating current input by the power supply into direct current to input to the driving end of the second switch module 1041.

[0041] When the power supply is powered on, since the second switch module 1041 is turned off when the driving end receives a high-level signal, the power supply can provide the third voltage signal to one end of the first capacitor 105 through the first diode 1042, that is, the first capacitor 105 can be charged through the first diode 1042.

[0042] When the power supply is powered off, since the second switch module 1041 is turned on when the driving end receives a low-level signal, the second switch module 1041 can provide the second voltage signal to one end of the first capacitor 105, that is, the first capacitor 105 can be discharged through the circuit in which the second switch module 1041 is turned on.

[0043] Based on the above manner, the power supply 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 supply circuit.

[0044] In addition, the second rectifying circuit can specifically include at least one second diode 1043, the anode of the second diode 1043 is connected to one output end of the power supply, and the cathode of the second diode 1043 is connected to the anode of the first diode 1042.

[0045] For example, the power supply is a single-phase alternating current power supply, the number of the second diode 1043 is one, and the anode of the second diode 1043 is connected to the zero line or the live line in the power supply to perform half-wave rectification. Figure 1 As shown in FIG. 4B, the power supply is a two-phase alternating current power supply, the number of the second diode 1043 is two, and the anode of each second diode 1043 is connected to the corresponding output line of the power supply. Figure 2 As shown in FIG. 4C, the power supply is a three-phase alternating current power supply (such as a mains power supply), the number of the second diode 1043 is three, and the anode of each second diode 1043 is connected to the corresponding output line of the power supply.

[0046] Optionally, the power supply detection circuit 104 further comprises a second resistor 1044 and a second capacitor 1045.

[0047] 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.

[0048] 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.

[0049] Specifically, a filter circuit can be constructed by the second resistor 1044 and the second capacitor 1045. Based on the above-mentioned manner, when the power supply is a single-phase alternating current power supply, the possibility that the relay switch module 1031 in the relay circuit is repeatedly adsorbed or released by the coil module 1032 due to the zero-crossing characteristic of the single-phase alternating current, and thus the relay switch module 1031 is repeatedly turned on and off, can be reduced, thereby improving the safety of the power supply circuit.

[0050] Further, the power supply detection circuit 104 further comprises a third resistor 1046, a fourth resistor 1047, a fifth resistor 1048, a sixth resistor 1049, and a third capacitor 1050.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] The sixth resistor 1049 is connected in parallel with the first capacitor 105.

[0055] 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.

[0056] Specifically, by setting the third resistor 1046 and the sixth resistor 1049 and appropriately adjusting the resistance values of the two resistors, the voltage that the first capacitor 105 can finally reach after the power supply is powered on can be regulated. By making the voltage that the first capacitor 105 can finally reach slightly greater than the voltage that can drive the first switch module 106 to turn on, the relay switch module 1031 can be quickly turned off after the power supply is powered off, thereby further reducing the possibility of the power supply being powered on again when the relay switch module is not yet turned off, and improving the safety of the power supply circuit.

[0057] By setting the fourth resistor 1047, the possibility of damage to the second switch module 1041 due to excessive current when the first capacitor 105 discharges can be reduced, and the safety of the power supply circuit is improved.

[0058] By setting the fifth resistor 1048 and setting an appropriate resistance value, the possibility of damage to the second switch module 1041 due to excessive voltage received at the drive end can be reduced, and the safety of the power supply circuit is improved.

[0059] By setting the third capacitor 1050, the function of protecting the first diode 1042 can be achieved, and the safety of the power supply circuit is improved.

[0060] In an embodiment, the power supply circuit further includes a seventh resistor 107 and a hysteresis circuit 108.

[0061] 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.

[0062] The hysteresis circuit 108 is connected to one end of the seventh resistor 107 and one end of the first capacitor 105, respectively, and the hysteresis circuit 108 is configured to charge the first capacitor 105 based on the first voltage signal when a voltage drop exists across the seventh resistor 107.

[0063] Specifically, based on the above-mentioned manner, when the power supply is powered on, a loop is formed due to the second voltage signal received at the other end of the coil module 1032, causing a voltage drop across the seventh resistor 107, and the hysteresis circuit 108 is triggered to charge the first capacitor 105 based on the first voltage signal, ensuring that the voltage of the first capacitor 105 is high enough to play a hysteresis role, reducing the possibility of repeated opening and conduction of the relay switch module 1031 due to repeated voltage rise and fall of the first capacitor 105, and improving the reliability of the power supply circuit.

[0064] Optionally, the hysteresis circuit 108 includes a third switch module 1081 and an eighth resistor 1082.

[0065] The drive end of the third switch module 1081 is connected to one end of the seventh resistor 107, and 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 configured to conduct when the drive end receives a low-level signal.

[0066] 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.

[0067] Specifically, based on the above manner, when a voltage drop is generated across the seventh resistor 107, the driving end of the third switch module 1081 receives a low-level signal and is turned on, and then the first capacitor 105 can be charged based on the first voltage signal. The circuit structure is simple, the response speed is fast, and the reliability of the power supply circuit is improved.

[0068] In an embodiment, the first switch module 106 includes a three-terminal adjustable voltage regulator.

[0069] 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 ground end of the three-terminal adjustable voltage regulator is the second end of the first switch module 106.

[0070] Specifically, the three-terminal adjustable voltage regulator can specifically include a TL431 type chip.

[0071] Based on the above manner, the response speed of the first switch module 106 can be improved, and then the reliability of the power supply circuit is improved.

[0072] In an embodiment, the power supply circuit further includes:

[0073] The bus capacitor 109 has one end connected to the other end of the first resistor 102, and the other end of the bus capacitor 109 receives a second voltage signal.

[0074] And / or, the power supply circuit further includes:

[0075] The direct current converter 110 has an input end connected to the other end of the first resistor 102, and an output end for outputting a power supply signal after direct current conversion.

[0076] And / or, the relay circuit 103 further includes a third diode 111, the negative electrode of the third diode 111 is connected to one end of the coil module 1032, and the positive electrode of the third diode 111 is connected to the other end of the coil module 1032.

[0077] Specifically, by setting the above bus capacitor 109, the stability of the final power supply signal VOUT output by the power supply circuit can be improved.

[0078] By setting the above direct current converter 110, the power supply signal can be directly converted to obtain a voltage signal of any amplitude, such as the first voltage signal and / or the second voltage signal.

[0079] By setting the above third diode 111, the current in the coil module 1032 can be reduced due to the fact that the second voltage signal cannot be received, and the possibility of damage to the circuit caused by excessively high voltage is reduced, and the reliability of the power supply circuit is improved.

[0080] In an application scenario, the direct current converter 110 can be replaced by other converters, such as a Buck converter, a forward converter, a flyback converter, a half-bridge converter, a full-bridge converter, and an LLC converter.

[0081] And / or, the VCC can be +5V, +12V, +24V, +48V, and any value in other amplitudes.

[0082] And / or, the second diode 1043 can be a high-voltage diode.

[0083] And / or, the first diode 1042 and the third diode 111 can be low-voltage diodes.

[0084] And / or, the first resistor 102 can be a power resistor or an NTC (Negative Temperature Coefficient) thermistor or a PTC (Positive Temperature Coefficient) thermistor, and the resistors in the power supply circuit except the first resistor 102 can be patch resistors.

[0085] The second capacitor 1045 can be a capacitor with a withstand voltage of 100V or more, and the capacitors in the power supply circuit except the second capacitor 1045 can be patch capacitors.

[0086] The present application also provides a power supply device, which is shown in Figure 3 , Figure 3 is a structural schematic diagram of an embodiment of the power supply device of the present application, as Figure 3 shown, the power supply device 20 includes a power supply circuit 21, which can be the power supply circuit described in any one of the foregoing embodiments, and details are not repeated here.

[0087] Distinguish from prior art, in the technical scheme of the application, through setting up power supply detection circuit and adopting power supply detection circuit to detect power supply, when power supply is powered on, make it output third voltage signal, to charge first capacitor, when voltage of first capacitor does not reach high level, can make power supply connect first rectifier circuit through first resistor, prevent surge current from causing damage to power supply circuit, and when voltage of first capacitor reaches high level, make first end and second end of first switch module conduct, thereby make coil module in relay circuit produce magnetic field and adsorb relay switch module to make it close, thereby bypass first resistor, improve power supply output efficiency, and when power supply is powered off, make it output second voltage signal, can make first capacitor discharge, rapidly make voltage of first capacitor lower than high level, first end and second end of first switch module are disconnected, thereby make coil module in relay circuit no longer produce magnetic field, relay switch module is disconnected, realize when power supply is powered off, make relay switch module can rapidly disconnect, reduce the possibility that power supply recovers power on when relay switch module has not disconnected, improve the safety of power supply circuit.

[0088] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0089] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0090] Any process or method descriptions in flow charts or otherwise described herein can be understood as representing code modules, segments, or portions of code that include one or more executable instructions for implementing specific logic functions or other processes, and the various embodiments of the present application can include additional or fewer functions performed in the order illustrated or discussed, including functions performed in a substantially simultaneous manner or in a reverse order. This should be understood by those skilled in the art.

[0091] The logic and / or steps represented in flow diagrams or otherwise described herein, for example, can be considered as a sequence of executable instructions, and can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a personal computer, server, network appliance, or other processing means, that can fetch the instructions from the instruction execution system, apparatus, or device, and execute the instructions. In the context of this specification, a "computer-readable medium" can be any means that can contain, store, communicate, propagate or transport the program for use by or in connection with the instruction execution system, apparatus, or device. The computer-readable medium can specifically include an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device. More specific computer-readable medium examples (a non-exhaustive list) can include the following: an electrical connection (electronic) having one or more wires, a portable computer diskette (magnetic), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, and a portable compact disc read-only memory (CDROM). Note that the computer-readable medium can even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, for example via an optical scanner, then compiled, interpreted, or otherwise processed, and stored in a computer memory in a form that can be later executed.

[0092] The above description is merely illustrative of the application, and does not limit the scope of the application, which is defined by the appended claims. Any equivalent structure or variations of the above described arrangements, or equivalent flowcharts, are also included in the scope of the application.

Claims

1. A power supply circuit, characterized by comprising: The power supply detection circuit comprises: a second rectifier circuit comprising an output end and at least one input end, wherein the input end of the second rectifier circuit is connected to the power supply; a second switch module and a first diode, wherein the driving end of the second switch module is connected to the output end of the second rectifier circuit and the anode of the first diode respectively, the first end of the second switch module is connected to the cathode of the first diode and one end of the first capacitor respectively, and the second end of the second switch module receives the second voltage signal, and the second switch module is turned on when the driving end receives a low-level signal. The second rectifier circuit comprises: at least one second diode, wherein the anode of the second diode is connected to an output end of the power supply, and the cathode of the second diode is connected to the anode of the first diode. The power supply detection circuit further comprises: a second resistor, wherein 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, wherein 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.

2. The power supply circuit of claim 1, wherein The power supply detection circuit further comprises: a third resistor, wherein 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, wherein 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; 3. The power supply circuit of claim 2, wherein a fifth resistor, wherein 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, wherein the sixth resistor is connected to the first capacitor in parallel.

4. The power supply circuit according to claim 2 or 3, characterized by ​ ​ ​ 5. The power supply circuit of claim 4, wherein, ​ ​ ​ ​ ​ 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 of 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, one end of the seventh resistor and one end of the first capacitor are respectively connected to the hysteresis circuit, and 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.

7. The power supply circuit of claim 6, wherein, The hysteresis circuit comprises: A third switch module, the driving 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 to turn on when the driving 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 supply circuit of 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 ground end of the three-terminal adjustable voltage regulator is the second end of the first switch module.

9. The power supply circuit of 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 further comprises: 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 comprises a third diode, the negative electrode of the third diode is connected to one end of the coil module, and the positive electrode of the third diode is connected to the other end of the coil module.

10. A power supply device, characterized by comprising: The power supply circuit comprises the power supply circuit according to any one of claims 1 to 9. The power supply circuit comprises the power supply circuit according to any one of claims 1 to 9.

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