Power supply circuit and electronic equipment

Abstract

A power supply circuit and an electronic device belong to the technical field of power supplies, a transient reset switch circuit accesses an input alternating current, and cuts off the input alternating current for a first preset duration according to an operation; the auxiliary power supply circuit outputs auxiliary direct current; the zero-cross detection circuit outputs a first low-level signal according to disconnection of the input alternating current; the conversion circuit outputs a second low-level signal and a first power supply direct current according to the auxiliary direct current and the first low-level signal; the control circuit controls the state of the light-emitting assembly according to the second low-level signal and the first power supply direct current. Therefore, when the control circuit cuts off the input alternating current, the power supply exists, the control circuit can still respond to the action of the transient reset switch circuit to control the state of the light-emitting component, and the use convenience is improved.

Description

Technical Field

[0001] The present application belongs to the field of power supply technology, and in particular relates to a power supply circuit and an electronic device. Background Art

[0002] Magnetic track lights are a lighting system that installs lights in rails and allows the lights to move with the rails. The lights are connected to the rails by magnetic attraction. They can be used in a variety of scenarios, including home environments or commercial scenes. There are many types of lights, including spotlights, floodlights, track lights, folding lights, spotlights, hanging lights, etc.

[0003] In traditional magnetic track lights, the power supply and control circuit are usually set separately, and the two are connected through the conductive rail in the magnetic track, that is, the power supply supplies power to the control circuit through the conductive rail. If you need to turn off the light, you can directly disconnect the power supply and the control circuit by pressing the ordinary switch. However, after the ordinary switch is pressed, since there are no more lines for communication between the ordinary switch and the control circuit, the control circuit loses power and stops working, and can no longer respond to the action of the ordinary switch to control the state of the light-emitting component, which reduces the convenience of using the track light. Summary of the invention

[0004] The purpose of the present application is to provide a power supply circuit and an electronic device, aiming to solve the problem that the existing magnetic track lights can no longer respond to the action of ordinary switches to control the state of the light-emitting components after the power is cut off by the switch, resulting in poor convenience of use.

[0005] The embodiment of the present application provides a power supply circuit connected to a light-emitting component, including:

[0006] A transient reset switch circuit, used for connecting to an input AC power and disconnecting the input AC power for a first preset time period according to an operation;

[0007] Auxiliary power supply circuit, used for outputting auxiliary direct current;

[0008] a zero-crossing detection circuit, connected to the transient reset switch circuit, and configured to output a first low-level signal according to the disconnection of the input alternating current;

[0009] a conversion circuit, connected to the auxiliary power supply circuit and the zero-crossing detection circuit, and configured to output a second low-level signal and a first power supply DC power according to the auxiliary DC power and the first low-level signal;

[0010] A control circuit is connected to the conversion circuit and is used to control the state of the light-emitting component according to the second low-level signal and the first power supply DC.

[0011] In one embodiment, the power supply circuit further comprises:

[0012] an AC-DC conversion circuit, connected to the transient reset switch circuit, the auxiliary power supply circuit and the zero-crossing detection circuit, and configured to convert the input AC power into a second supply DC power;

[0013] The zero-crossing detection circuit is further used to perform zero-crossing detection on the input alternating current to output a first square wave signal;

[0014] The conversion circuit is further used to output a second square wave signal and a first power supply DC power according to the second power supply DC power and the first square wave signal;

[0015] The control circuit is further configured to maintain the state of the light-emitting component according to the first power supply DC power and the second square wave signal.

[0016] In one embodiment, the zero-crossing detection circuit comprises:

[0017] a zero-crossing detection module, connected to the AC-DC conversion circuit and the transient reset switch circuit, configured to output a third low-level signal according to the disconnection of the input AC power, and perform zero-crossing detection on the input AC power to output a third wave signal;

[0018] The limiting module is connected to the zero-crossing detection module and the conversion circuit, and is used to limit the third low-level signal to output the first low-level signal; or to limit the third square wave signal to output the first square wave signal.

[0019] In one embodiment, the conversion circuit comprises:

[0020] a superposition circuit, connected to the AC / DC conversion circuit, the auxiliary power supply circuit and the zero-crossing detection circuit, and configured to superimpose the auxiliary DC power and the first low-level signal to output a first carrier signal, or superimpose the second power supply DC power and the first square wave signal to output a second carrier signal;

[0021] a signal recovery circuit, connected to the superposition circuit, and configured to filter the first carrier signal to output the second low-level signal, or filter the second carrier signal to output the second square wave signal;

[0022] A notch circuit is connected to the superposition circuit and the signal recovery circuit, and is used to notch the first carrier signal to output the first power supply DC power, or to notch the second carrier signal to output the first power supply DC power.

[0023] In one of the embodiments, the signal recovery circuit includes a first operational amplifier, a tenth resistor and a second capacitor;

[0024] The first end of the second capacitor serves as the first carrier signal input end and the second carrier signal input end of the signal recovery circuit, and is connected to the superposition circuit to input the first carrier signal and the second carrier signal; the second end of the second capacitor, the non-phase input end of the first operational amplifier and the first end of the tenth resistor are connected, the inverting input end of the first operational amplifier and the output end of the first operational amplifier jointly serve as the second low-level signal output end and the second square wave signal output end of the signal recovery circuit, and are connected to the control circuit to output the second low-level signal and the second square wave signal; the second end of the tenth resistor is connected to the third power supply.

[0025] In one embodiment, the trap circuit includes a second operational amplifier, a third operational amplifier, a seventh resistor, an eighth resistor, a ninth resistor, an eleventh resistor, a twelfth resistor, a third capacitor, a fourth capacitor, and a fifth capacitor;

[0026] The first end of the third capacitor and the first end of the eighth resistor serve together as the first carrier signal input end and the second carrier signal input end of the trap circuit, and are connected to the superposition circuit and the signal recovery circuit to input the first carrier signal and the second carrier signal; the second end of the third capacitor, the first end of the fourth capacitor and the first end of the seventh resistor are connected, the second end of the eighth resistor, the first end of the ninth resistor and the first end of the fifth capacitor are connected, the second end of the fourth capacitor and the second end of the ninth resistor are connected to the positive phase input end of the third operational amplifier, the second end of the seventh resistor, the second end of the fifth capacitor, the inverting input end of the second operational amplifier and the output end of the second operational amplifier are connected, the inverting input end of the third operational amplifier, the output end of the third operational amplifier and the first end of the eleventh resistor serve together as the first power supply DC output end of the trap circuit, and are connected to the control circuit to output the first power supply DC; the second end of the eleventh resistor is connected to the first end of the twelfth resistor, and the positive phase input end of the second operational amplifier and the second end of the twelfth resistor are connected to the power ground.

[0027] In one embodiment, the power supply circuit further comprises:

[0028] A selection circuit connected to the AC / DC conversion circuit, the auxiliary power supply circuit and the conversion circuit, and configured to select and output the DC power with a larger voltage between the second power supply DC power and the auxiliary DC power;

[0029] Wherein, the voltage of the second power supply DC power is greater than or equal to the voltage of the auxiliary DC power.

[0030] In one embodiment, the auxiliary power supply circuit includes:

[0031] a battery, for charging according to a charging voltage and outputting a battery voltage;

[0032] A voltage conversion circuit is connected to the battery, the AC / DC conversion circuit and the conversion circuit, and is used to boost the battery voltage to output the auxiliary DC power, and convert the second supply DC power into the charging voltage to charge the battery.

[0033] In one embodiment, the control circuit comprises:

[0034] A communication circuit, connected to the conversion circuit, for receiving a communication signal and outputting a control signal according to the communication signal and / or the second low-level signal;

[0035] A driving circuit is connected to the conversion circuit and the communication circuit, and is used to output a driving signal according to the first power supply DC and the control signal to control the state of the light-emitting component.

[0036] An embodiment of the present application further provides an electronic device, which includes the above-mentioned power supply circuit.

[0037] Compared with the prior art, the embodiments of the present application have the following beneficial effects: when the input AC power is disconnected, the zero-crossing detection circuit outputs a first low-level signal according to the disconnection of the input AC power, so that the conversion circuit outputs a second low-level signal and a first power supply DC power according to the auxiliary DC power and the first low-level signal, so that the control circuit still has a power supply during the period when the input AC power is disconnected, so the control circuit can still respond to the action of the transient reset switch circuit to control the state of the light-emitting component, thereby improving the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical application in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 A schematic diagram of a power supply circuit provided in one embodiment of the present application;

[0040] Figure 2 Another structural schematic diagram of a power supply circuit provided in an embodiment of the present application;

[0041] Figure 3 Another structural schematic diagram of a power supply circuit provided in an embodiment of the present application;

[0042] Figure 4 Another structural schematic diagram of a power supply circuit provided in an embodiment of the present application;

[0043] Figure 5 Another structural schematic diagram of a power supply circuit provided in an embodiment of the present application;

[0044] Figure 6 Another structural schematic diagram of a power supply circuit provided in an embodiment of the present application;

[0045] Figure 7 Another structural schematic diagram of a power supply circuit provided in an embodiment of the present application;

[0046] Figure 8 A partial exemplary circuit schematic diagram of a power supply circuit provided in an embodiment of the present application;

[0047] Fig. 9 Another partial exemplary circuit schematic diagram of a power supply circuit provided in an embodiment of the present application;

[0048] Fig.10 Another partial exemplary circuit schematic diagram of a power supply circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0050] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0051] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0053] Figure 1 The schematic diagram of the structure of the power supply circuit provided by an embodiment of the present application is shown. For the convenience of description, only the part related to the present embodiment is shown, which is described in detail as follows:

[0054] The power supply circuit is connected to the light-emitting component, and includes a transient reset switch circuit 10 , an auxiliary power supply circuit 20 , a zero-crossing detection circuit 30 , a conversion circuit 40 and a control circuit 50 .

[0055] The transient reset switch circuit 10 is used for receiving input AC power and disconnecting the input AC power for a first preset time period according to operation.

[0056] The auxiliary power supply circuit 20 is used to output auxiliary direct current; it can be understood that the auxiliary direct current is used to power the light-emitting component after the user presses the switch.

[0057] The zero-crossing detection circuit 30 is connected to the transient reset switch circuit 10 and is used to output a first low-level signal according to the disconnection of the input AC power. It can be understood that the zero-crossing detection circuit 30 is used to detect the action of pressing the switch.

[0058] The conversion circuit 40 is connected to the auxiliary power supply circuit 20 and the zero-crossing detection circuit 30, and is used to output a second low-level signal and a first power supply DC power according to the auxiliary DC power and the first low-level signal.

[0059] The control circuit 50 is connected to the conversion circuit 40 and is used to control the state of the light-emitting component according to the second low-level signal and the first power supply DC.

[0060] The momentary reset switch may include a reset switch. When the reset switch is pressed, the reset switch stops transmitting the input AC power. After a first preset time period, the reset switch automatically rebounds and resumes transmitting the input AC power.

[0061] In a specific implementation, the light-emitting component may be a track light.

[0062] Each time the reset switch is pressed, the zero-crossing detection circuit 30 outputs a first low-level signal according to the disconnection of the input AC power, and the auxiliary power supply circuit 20 outputs auxiliary DC power for power supply, so that the conversion circuit 40 outputs a second low-level signal and a first power supply DC power according to the auxiliary DC power and the first low-level signal, and the control circuit 50 is always in a working state according to the first power supply DC power, and the user presses the reset switch once, and the conversion circuit 40 outputs a second low-level signal, and presses it multiple times, and the conversion circuit 40 outputs multiple second low-level signals, so the control circuit 50 can receive each second low-level signal output by the conversion circuit 40, so that the control circuit 50 can change the state of the light-emitting component according to the number of received second low-level signals. In a specific implementation, it can be set that the track light is turned off after the second preset time when the reset switch is pressed once; when the reset switch is pressed multiple times (the time interval between each press is less than the second preset time, for example, the second preset time can be 2.5S, and the time interval between each press can be 2S), the control circuit 50 changes other states of the light-emitting component. For example, if you press the reset switch twice, the track light will flash twice and then increase the brightness; if you press the reset switch three times, the track light will flash twice and then decrease the brightness; if you press the reset switch four times, the track light will flash twice and then switch the color temperature; if you press the reset switch five times, reconnect the network; if you press the reset switch six times, the factory settings will be restored. In addition, during the operation of the reset switch, the track light will not be powered off and can illuminate normally due to the auxiliary DC power supply.

[0063] By way of example and not limitation, Figure 2 As shown, the power supply circuit further includes an AC-DC conversion circuit 60 .

[0064] The AC-DC conversion circuit 60 is connected to the transient reset switch circuit 10, the auxiliary power circuit 20 and the zero-crossing detection circuit 30, and is used to convert the input AC power into a second supply DC power.

[0065] The zero-crossing detection circuit 30 is further used to perform zero-crossing detection and amplitude limiting on the input alternating current to output a first square wave signal.

[0066] The conversion circuit 40 is further configured to output a second square wave signal and the first power supply DC power according to the second power supply DC power and the first square wave signal.

[0067] The control circuit 50 is further configured to maintain the state of the light emitting component according to the first DC power supply and the second square wave signal.

[0068] When the transient reset switch circuit 10 transmits the input AC power normally, the AC-DC conversion circuit 60 converts the input AC power into the second power supply DC power, the zero-crossing detection circuit 30 performs zero-crossing detection and amplitude limiting on the input AC power, and outputs a first square wave signal consistent with the frequency of the input AC power, the conversion circuit 40 outputs the first power supply DC power and the second square wave signal consistent with the frequency of the first square wave signal according to the second power supply DC power and the first square wave signal, and the control circuit 50 receives the second square wave signal and determines that the transient reset switch circuit 10 is not in action at this time, so the state of the light-emitting component is maintained. Thus, the light-emitting component is normally illuminated.

[0069] By way of example and not limitation, Figure 3 As shown, the conversion circuit 40 includes a superposition circuit 41 , a signal recovery circuit 42 and a trap circuit 43 .

[0070] The superposition circuit 41 is connected to the AC / DC conversion circuit 60, the auxiliary power supply circuit 20 and the zero-crossing detection circuit 30, and is used to superimpose the auxiliary DC power and the first low-level signal to output a first carrier signal, or to superimpose the second power supply DC power and the first square wave signal to output a second carrier signal.

[0071] The signal recovery circuit 42 is connected to the superposition circuit 41, and is used to filter the first carrier signal to output a second low-level signal, or to filter the second carrier signal to output a second square wave signal.

[0072] The trap circuit 43 is connected to the superposition circuit 41 and the signal recovery circuit 42, and is used to trap the first carrier signal to output the first power supply DC power, or to trap the second carrier signal to output the first power supply DC power; it can be understood that the first power supply DC power is used to meet the power supply requirements of the light-emitting component.

[0073] The auxiliary direct current and the first low-level signal are superimposed by the superposition circuit 41. When applied to track lights, the first carrier signal can be transmitted through the conductive rail to adapt to the current scenario where houses usually only reserve power lines and ground lines but no signal lines. Users do not need to re-construct the power lines, making it easy to use. Construction workers have fewer connection lines when installing track lights, which can reduce the probability of misoperation and improve the reliability of the power supply circuit.

[0074] By way of example and not limitation, Figure 4 As shown, the zero-crossing detection circuit 30 includes a zero-crossing detection module 31 and a limiting module 32 .

[0075] The zero-crossing detection module 31 is connected to the AC-DC conversion circuit 60 and the transient reset switch circuit 10, and is used to output a third low-level signal according to the disconnection of the input AC power, and perform zero-crossing detection on the input AC power to output a third wave signal.

[0076] The limiting module 32 is connected to the zero-crossing detection module 31 and the conversion circuit 40, and is used to limit the third low-level signal to output a first low-level signal; or limit the third square wave signal to output a first square wave signal.

[0077] The third wave signal is limited by the limiting module 32, which reduces the possibility that the third wave signal amplitude is too large and affects the stability of the light-emitting component, and improves the safety and reliability of the power supply circuit.

[0078] By way of example and not limitation, Figure 5 As shown, the power supply circuit further includes a selection circuit 70 .

[0079] The selection circuit 70 is connected to the AC / DC conversion circuit 60, the auxiliary power supply circuit 20 and the conversion circuit 40, and is used for selecting and outputting the DC power with a larger voltage between the second power supply DC power and the auxiliary DC power.

[0080] The voltage of the second power supply DC power is greater than or equal to the voltage of the auxiliary DC power.

[0081] The selection circuit 70 reduces the possibility of the second power supply DC power flowing back into the auxiliary power supply circuit 20 when the second power supply DC power and the auxiliary DC power exist at the same time, thereby improving the safety of the power supply circuit.

[0082] By way of example and not limitation, Figure 6 As shown, the auxiliary power supply circuit 20 includes:

[0083] The battery 21 is used to be charged according to the charging voltage and output the battery voltage.

[0084] The voltage conversion circuit 22 is connected to the battery 21 , the AC / DC conversion circuit 60 and the conversion circuit 40 , and is used to boost the battery voltage to output auxiliary DC power, and convert the second supply DC power into a charging voltage to charge the battery 21 .

[0085] It is understandable that the capacity of the battery 21 can be set according to actual needs.

[0086] In a specific implementation, the voltage conversion circuit 22 may include a boost circuit, a buck circuit, and a charging circuit.

[0087] A step-down circuit, connected to the AC / DC conversion circuit 60 and the conversion circuit 40, for stepping down the second DC power supply to output a first voltage;

[0088] A charging circuit, connected to the step-down circuit and the battery 21, for converting the first voltage into a charging voltage and for converting the battery voltage into a second voltage;

[0089] The boost circuit is connected to the charging circuit, the AC / DC conversion circuit 60 and the conversion circuit 40, and is used to boost the second voltage to output auxiliary DC power.

[0090] It should be noted that when the battery 21 is fully charged or the battery voltage is too low, the voltage conversion circuit 22 can serve as a battery protection board to reduce the risk of overcharging and over-discharging of the battery 21, thereby reducing the risk of damage to the battery 21.

[0091] In a specific implementation, the voltage conversion circuit 22 can boost the battery voltage to output auxiliary DC power. The voltage conversion circuit 22 can also step down the second supply DC power to output a charging voltage to adapt to batteries with different voltages, thereby improving the adaptability of the power supply circuit.

[0092] By way of example and not limitation, Figure 7 As shown, the control circuit 50 includes a communication circuit 51 and a driving circuit 52 .

[0093] The communication circuit 51 is connected to the conversion circuit 40, and is used for receiving the communication signal and outputting the control signal according to the communication signal and / or the second low-level signal.

[0094] The driving circuit 52 is connected to the conversion circuit 40 and the communication circuit 51, and is used to output a driving signal according to the first power supply DC power and the control signal to control the state of the light-emitting component.

[0095] In a specific implementation, the communication signal can be output by a mobile device or a central controller. The communication signal can carry information including the brightness, color temperature, switch state, etc. of the light-emitting component. The driving circuit 52 adjusts the brightness, color temperature or switch state of the light-emitting component according to the control signal, thereby enriching the function of the light-emitting component.

[0096] Since the auxiliary power supply circuit 20 outputs auxiliary direct current for power supply, the control circuit 50 is always in working state, and the control circuit 50 can also save the current working state of the track light. At this time, the instantaneous reset switch circuit 10 and the mobile device can be used to control the track light in a mixed manner, or the instantaneous reset switch circuit 10 and the central controller can be used to control the track light in a mixed manner. For example, press the reset switch once to turn off the track light, then output the communication signal to control the track light to turn on, and press the reset switch again to turn off the track light again. In this way, the flexibility and convenience of switching the light on and off are improved.

[0097] Figure 8 A partial exemplary circuit structure of a power supply circuit provided in an embodiment of the present application is shown. Fig. 9 Another partial exemplary circuit structure of the power supply circuit provided in the embodiment of the present application is shown. Fig.10Another partial exemplary circuit structure of the power supply circuit provided in the embodiment of the present application is shown. For the convenience of description, only the part related to the embodiment of the present application is shown, which is described in detail as follows:

[0098] like Figure 8 , Fig. 9 and Fig.10 As shown, the signal recovery circuit 42 includes a first operational amplifier M1, a tenth resistor R10 and a second capacitor C2.

[0099] The first end of the second capacitor C2 serves as the first carrier signal input end of the signal recovery circuit 42 and the second carrier signal input end of the signal recovery circuit 42, and is connected to the superposition circuit 41 to input the first carrier signal and the second carrier signal; the second end of the second capacitor C2, the non-phase input end of the first operational amplifier M1 and the first end of the tenth resistor R10 are connected, the inverting input end of the first operational amplifier M1 and the output end of the first operational amplifier M1 jointly serve as the second low-level signal output end of the signal recovery circuit 42 and the second square wave signal output end of the signal recovery circuit 42, and are connected to the control circuit 50 to output the second low-level signal and the second square wave signal; the second end of the tenth resistor R10 is connected to the third power supply.

[0100] The tenth resistor R10 and the second capacitor C2 form a first-order high-pass filter, whose cut-off frequency F0=1 / 2πRC, and the resistance value of the tenth resistor R10 and the capacitance value of the second capacitor C2 can be adjusted according to actual needs. For example, the tenth resistor R10 can be set to 4KΩ, and the second capacitor C2 can be set to 1μF, and the cut-off frequency is 40Hz at this time. Since the frequency of the first square wave signal is the same as the input AC frequency, both are 50Hz, the DC power is filtered out at this time, and the first operational amplifier M1 amplifies the second low-level signal to output the first low-level signal; or amplifies the first square wave signal to output the second square wave signal.

[0101] The circuit is simple and reliable.

[0102] like Figure 8 , Fig. 9 and Fig.10 As shown, the trap circuit 43 includes a second operational amplifier M2, a third operational amplifier M3, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, an eleventh resistor R11, a twelfth resistor R12, a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5.

[0103] The first end of the third capacitor C3 and the first end of the eighth resistor R8 are used together as the first carrier signal input end of the trap circuit 43 and the second carrier signal input end of the trap circuit 43, and are connected to the superposition circuit 41 and the signal recovery circuit 42 to input the first carrier signal and the second carrier signal; the second end of the third capacitor C3, the first end of the fourth capacitor C4 and the first end of the seventh resistor R7 are connected, the second end of the eighth resistor R8, the first end of the ninth resistor R9 and the first end of the fifth capacitor C5 are connected, and the second end of the fourth capacitor C4, the second end of the ninth resistor R9 and the non-inverting input end of the third operational amplifier M3 are connected. The second end of the seventh resistor R7, the second end of the fifth capacitor C5, the inverting input end of the second operational amplifier M2 and the output end of the second operational amplifier M2 are connected, the inverting input end of the third operational amplifier M3, the output end of the third operational amplifier M3 and the first end of the eleventh resistor R11 are commonly used as the first power supply DC output end of the trap circuit 43, and are connected to the control circuit 50 to output the first power supply DC; the second end of the eleventh resistor R11 is connected to the first end of the twelfth resistor R12, the non-inverting input end of the second operational amplifier M2 and the second end of the twelfth resistor R12 are connected to the power ground.

[0104] The notch circuit 43 is also called a band-stop filter circuit, which is used to suppress or attenuate signals in a certain frequency band and allow all signals outside the frequency band to pass.

[0105] Among them, the third capacitor C3, the fourth capacitor C4 and the seventh resistor R7 form a high-pass filter circuit, the eighth resistor R8, the ninth resistor R9 and the fifth capacitor C5 form a low-pass filter circuit, and the high-pass filter circuit and the low-pass filter circuit are connected in parallel to form a band-stop filter circuit. Since the passive band-stop filter circuit has a relatively small input impedance and a relatively large output impedance, it is easily affected by the circuit's front and rear stages, so the second operational amplifier circuit and the third operational amplifier circuit are added to form an active band-stop filter circuit to improve the stability of the trap circuit 43, so the trap circuit 43 is stable and reliable.

[0106] like Figure 8 , Fig. 9 and Fig.10 As shown, the selection circuit 70 includes a third diode D3 and a fourth diode D4.

[0107] The anode of the third diode D3 serves as the second DC power supply input terminal of the selection circuit 70, and is connected to the AC-DC conversion circuit 60 and the auxiliary power supply circuit 20 to input the second DC power supply; the anode of the fourth diode D4 serves as the auxiliary DC power input terminal of the selection circuit 70, and is connected to the auxiliary power supply circuit 20 to input the auxiliary DC power; the cathode of the third diode D3 and the cathode of the fourth diode D4 serve as the second DC power supply output terminal of the selection circuit 70 or the auxiliary DC power output terminal of the selection circuit 70, and are connected to the conversion circuit 40 to output the second DC power supply or the auxiliary DC power.

[0108] It can be understood that if the voltage of the second power supply DC is lower than the voltage of the auxiliary DC, the third diode D3 acts as a clamp, and if the voltage of the second power supply DC is higher than the voltage of the auxiliary DC, the fourth diode D4 acts as a clamp, thereby selecting the one with the higher voltage between the second power supply DC and the auxiliary DC to be output.

[0109] like Figure 8 As shown, the zero-crossing detection module 31 includes a first transistor Q1 , a first resistor R1 , a second resistor R2 , and a third resistor R3 .

[0110] The first end of the first resistor R1 serves as an input AC power input end of the zero-crossing detection module 31, and is connected to the transient reset switch circuit 10 and the AC-DC conversion circuit 60 to receive the input AC power; the second end of the first resistor R1, the first end of the second resistor R2 and the base of the first transistor Q1 are connected, the collector of the first transistor Q1 and the first end of the third resistor R3 serve together as a third low-level signal output end of the zero-crossing detection module 31 and a third wave signal output end of the zero-crossing detection module 31, and are connected to the limiter module 32 to output a third low-level signal and a third wave signal; the second end of the third resistor R3 is connected to the first power supply; the emitter of the first transistor Q1 and the second end of the second resistor R2 are connected to the power ground.

[0111] In a specific implementation, when the first end of the first resistor R1 is at a low level or is connected to the negative half cycle of the input alternating current, the first transistor Q1 is cut off, and the collector of the first transistor Q1 and the first end of the third resistor R3 output a high level; when the first end of the first resistor R1 is connected to the positive half cycle of the input alternating current, the first transistor Q1 is turned on, and the collector of the first transistor Q1 and the first end of the third resistor R3 output a low level.

[0112] like Figure 8 As shown, the limiting module 32 includes a first diode D1, a fourth resistor R4 and a direct current power supply DC.

[0113] The first end of the fourth resistor R4 serves as the third low-level signal input end of the limiting module 32 and the third square wave signal input end of the limiting module 32, and is connected to the zero-crossing detection module 31 to input the third low-level signal and the third square wave signal; the second end of the fourth resistor R4 and the positive electrode of the first diode D1 serve together as the first low-level signal output end of the limiting module 32 and the first square wave signal output end of the limiting module 32 to output the first low-level signal and the first square wave signal; the cathode of the first diode D1 is connected to the positive electrode of the DC power supply DC, and the negative electrode of the DC power supply DC is connected to the power ground.

[0114] Among them, the fourth resistor R4 is a current limiting resistor to prevent the third wave signal current from being too large to damage the first diode D1. The first diode D1 is a clamping diode with a conduction voltage of approximately 0.6V. When the third wave signal is greater than 0.6V, the first diode D1 is turned on, and the third wave signal voltage is clamped to 0.6V. After output, the subsequent circuit may not be able to accurately identify it due to the low voltage. After adding a DC power supply DC to provide a DC bias, the clamping voltage can be increased to 2V, thereby outputting a 2V first square wave signal.

[0115] like Figure 8 As shown, the superposition circuit 41 includes a second transistor Q2, a second diode D2, a fifth resistor R5, a sixth resistor R6 and a first capacitor C1.

[0116] The first end of the fifth resistor R5 and the base of the second transistor Q2 serve together as the first low-level signal input end of the superimposition circuit 41 and the first square wave signal input end of the superimposition circuit 41, and are connected to the zero-crossing detection circuit 30 to input the first low-level signal and the first square wave signal; the collector of the second transistor Q2 is connected to the first end of the sixth resistor R6, the first end of the first capacitor C1 and the positive electrode of the second diode D2, and the second end of the first capacitor C1 and the negative electrode of the second diode D2 serve together as the auxiliary DC input end of the superimposition circuit 41, the second power supply DC input end of the superimposition circuit 41, the first carrier signal output end of the superimposition circuit 41 and the second carrier signal output end of the superimposition circuit 41 to input the auxiliary DC power and the first power supply DC power, and output the first carrier signal and the second carrier signal; the second end of the fifth resistor R5 is connected to the second power supply, and the emitter of the second transistor Q2 and the second end of the sixth resistor R6 are connected to the power ground.

[0117] Among them, the fifth resistor R5 is a pull-up resistor, the second diode D2 is a voltage-stabilizing diode, and the second power supply can be 2V. When the base of the second transistor Q2 is at a high level, the second transistor Q2 is turned on, and at this time 2V is superimposed on the second power supply DC. When the base of the second transistor Q2 is at a low level, the second transistor Q2 is cut off, and at this time the low-level signal is superimposed on the second power supply DC.

[0118] like Fig. 9 and Fig.10 As shown, the superposition circuit 41 includes a fourth operational amplifier M4, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21 and a twenty-second resistor R22.

[0119] The first end of the nineteenth resistor R19 is used as the auxiliary DC input end of the superimposition circuit 41 and the second power supply DC input end of the superimposition circuit 41, and is connected to the selection circuit 70 to input the auxiliary DC power and the second power supply DC power; the first end of the twentieth resistor R20 is used as the first low level signal of the superimposition circuit 41 and the first square wave signal input end of the superimposition circuit 41, and is connected to the zero crossing detection circuit 30 to input the first low level signal and the first square wave signal; the second end of the nineteenth resistor R19, the second end of the twentieth resistor R20 and the non-inverting input end of the fourth operational amplifier M4 are connected, and the output end of the fourth operational amplifier M4 and the first end of the twenty-first resistor R21 are used together as the first carrier signal output end of the superimposition circuit 41 and the second carrier signal output end of the superimposition circuit 41 to output the first carrier signal and the second carrier signal; the inverting input end of the fourth operational amplifier M4, the second end of the twenty-first resistor R21 and the first end of the twenty-second resistor R22 are connected, and the second end of the twenty-second resistor R22 is connected to the power ground.

[0120] When the second power supply DC and the first square wave signal are superimposed, the transfer function of the superimposition circuit 41 is:

[0121] Vout=(1+R21 / R22)*(R19*V1+R20*V2) / (R20+R19)

[0122] Wherein, Vout is the output voltage, V1 is the first power supply DC voltage, and V2 is the first square wave signal voltage.

[0123] The fourth operational amplifier M4 needs to use a high-power operational amplifier to reduce the possibility of device damage caused by overvoltage.

[0124] like Fig. 9 As shown, the zero-crossing detection circuit 30 includes a first photocoupler U1, a third transistor Q3, a fifth diode D5, a sixth diode D6, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a sixth capacitor C6 and a seventh capacitor C7.

[0125] The input AC power is transmitted through an AC bus, which includes a live wire and a neutral wire.

[0126] The anode of the fifth diode D5 is connected to the live wire as the first input AC input terminal of the zero-crossing detection circuit 30, and the first end of the fifteenth resistor R15 is connected to the neutral wire as the second input AC input terminal of the zero-crossing detection circuit 30, and the first input AC input terminal of the zero-crossing detection circuit 30 and the second input AC input terminal of the zero-crossing detection circuit 30 are connected to the input AC together; the cathode of the fifth diode D5 is connected to the first end of the thirteenth resistor R13, the second end of the fifteenth resistor R15, the first end of the fourteenth resistor R14, and the cathode of the sixth diode D6 are connected to the base of the third transistor Q3, the anode of the sixth diode D6, the first end of the sixth capacitor C6 are connected to the emitter of the third transistor Q3, the second end of the thirteenth resistor R13, the second end of the fourteenth resistor R14, and the second end of the sixth capacitor C6 are connected The first end of the first photocoupler U1 is connected to the first end of the sixteenth resistor R16, the second end of the sixteenth resistor R16 is connected to the positive electrode of the first photocoupler U1, the collector of the third transistor Q3 is connected to the negative electrode of the first photocoupler U1, the voltage output end of the first photocoupler U1, the first end of the seventeenth resistor R17 and the first end of the eighteenth resistor R18 are connected, and the second end of the eighteenth resistor R18 is used as the first low-level signal output end of the zero-crossing detection circuit 30 and the first square wave signal output end of the zero-crossing detection circuit 30, and is connected to the conversion circuit 40 to output the first low-level signal and the first square wave signal; the power supply voltage end of the first photocoupler U1, the second end of the seventeenth resistor R17 and the first end of the seventh capacitor C7 are connected to the fourth power supply; the grounding end of the first photocoupler U1 and the second end of the seventh capacitor C7 are connected to the power ground.

[0127] When the input AC power is just connected, the input AC power charges the sixth capacitor C6 through the thirteenth resistor R13, and the input AC power voltage gradually decreases until the difference between the voltage at the first input AC power input terminal of the zero-crossing detection circuit 30 and the voltage at the second input AC power input terminal of the zero-crossing detection circuit 30 is less than the voltage of the sixth capacitor C6, and the charging stops, the sixth capacitor C6 discharges, and the base of the third transistor Q3 is powered. The third transistor Q3 is turned on to provide a primary drive current for the first photocoupler U1, and the first photocoupler U1 outputs a zero-crossing detection signal.

[0128] like Fig.10 As shown, the zero-crossing detection circuit 30 includes a transformer T1, a fourth transistor Q4, a fifth transistor Q5, a sixth transistor Q6, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirtieth resistor R30 and a thirty-first resistor R31.

[0129] The first end of the primary side of the transformer T1 and the second end of the primary side of the transformer T1 are used together as the input AC input end of the zero-crossing detection circuit 30, and are connected to the transient reset switch circuit 10 and the AC-DC conversion circuit 60 to receive the input AC power; the first end of the secondary side of the transformer T1, the collector of the fourth transistor Q4 and the first end of the twenty-sixth resistor R26 are connected, the emitter of the fourth transistor Q4 is connected to the first end of the twenty-fourth resistor R24, the second end of the twenty-sixth resistor R26, the first end of the twenty-seventh resistor R27 and the base of the fourth transistor Q4 are connected, the second end of the twenty-fourth resistor R24 ​​is connected to the base of the sixth transistor Q6, the collector of the sixth transistor Q6, the first end of the twenty-eighth resistor R28 and the first end of the thirtieth resistor R30 are connected, the emitter of the sixth transistor Q6, the emitter of the twenty-ninth resistor R29 are connected The first end is connected to the emitter of the fifth transistor Q5, the second end of the 30th resistor R30 and the first end of the 31st resistor R31 are connected to the base of the fifth transistor Q5, the collector of the fifth transistor Q5 is connected to the first end of the 23rd resistor R23, the second end of the 23rd resistor R23 and the first end of the 25th resistor R25 jointly serve as the first low-level signal output end of the zero-crossing detection circuit 30 and the first square wave signal output end of the zero-crossing detection circuit 30, and are connected to the conversion circuit 40 to output the first low-level signal and the first square wave signal; the second end of the 28th resistor R28 and the second end of the 25th resistor R25 are connected to the fifth power supply, and the second end of the secondary side of the transformer T1, the second end of the 27th resistor R27, the second end of the 29th resistor R29 and the second end of the 31st resistor R31 are connected to the power ground.

[0130] Among them, the transformer T1 steps down the input AC power, and the current limiting circuit includes a fourth transistor Q4, a twenty-fourth resistor R24, a twenty-sixth resistor R26 and a twenty-seventh resistor R27. In a specific implementation, the resistance value of the twenty-seventh resistor R27 can be set to be greater than the resistance value of the twenty-fourth resistor R24. When the input AC current after the voltage reduction is less than the set value, the twenty-sixth resistor R26 provides a bias current for the fourth transistor Q4, and the fourth transistor Q4 is turned on and works in an amplification state, and the input AC power after the voltage reduction is not limited. When the input AC current after the voltage reduction is greater than the set value, the voltage drop of the twenty-fourth resistor R24 ​​and the subsequent circuit increases, and the sum of the voltage drops of the twenty-fourth resistor R24, the fourth transistor Q4 and the subsequent circuit is close to the voltage drop on the twenty-seventh resistor R27, and the fourth transistor Q4 works in a saturation state, thereby limiting the current to a certain level.

[0131] The Schmitt trigger includes a sixth transistor Q6, a fifth transistor Q5, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirtieth resistor R30, a thirty-first resistor R31, a twenty-third resistor R23 and a twenty-fifth resistor R25. When the input AC voltage after current limiting is lower than the common emitter voltage, the fifth transistor Q5 is turned on, the sixth transistor Q6 is turned off, and the Schmitt trigger outputs a low level. The input AC voltage after current limiting gradually increases until it is higher than the threshold voltage of the sixth transistor Q6. The sixth transistor Q6 is turned on, the fifth transistor Q5 is turned off, and the Schmitt trigger outputs a high level. As a result, the second end of the twenty-third resistor R23 and the first end of the twenty-fifth resistor R25 output a first low level signal and a first square wave signal.

[0132] The following is a combination of working principles Figures 8 to 10 As shown for further explanation:

[0133] like Figure 8 As shown, when the transient reset switch circuit 10 transmits input AC power normally, the AC-DC conversion circuit 60 converts the input AC power into a second supply DC power to the positive electrode of the voltage conversion circuit 22 and the third diode D3, and the voltage conversion circuit 22 converts the second supply DC power into a charging voltage to charge the battery 21. After the battery 21 is fully charged, the battery voltage is output. The voltage conversion circuit 22 boosts the battery voltage and outputs auxiliary DC power to the positive electrode of the fourth diode D4. The third diode D3 and the fourth diode D4 select to output the second supply DC power to the second end of the first capacitor C1 and the negative electrode of the second diode D2.

[0134] The first end of the first resistor R1 is connected to the input alternating current, which is converted into a third wave signal through the first transistor Q1, and the third wave signal is output from the collector of the first transistor Q1 and the first end of the third resistor R3 to the first end of the fourth resistor R4. The first diode D1 clamps the third wave signal, and outputs the first square wave signal from the second end of the fourth resistor R4 and the positive electrode of the first diode D1 to the first end of the fifth resistor R5 and the base of the second transistor Q2. The first square wave signal and the second power supply direct current are superimposed, and the second end of the first capacitor C1 and the negative electrode of the second diode D2 output the second carrier signal to the first end of the second capacitor C2, the first end of the third capacitor C3 and the first end of the eighth resistor R8. The tenth resistor R10 and the second capacitor C2 filter the second carrier signal. The operational amplifier M1 amplifies the filtered second carrier signal, and outputs a second square wave signal from the inverting input terminal of the first operational amplifier M1 and the output terminal of the first operational amplifier M1 to the communication circuit 51. The communication circuit 51 receives the communication signal, and outputs a control signal to the drive circuit 52 according to the communication signal and / or the second square wave signal. The first end of the third capacitor C3 and the first end of the eighth resistor R8 receive the second carrier signal, the trap circuit 43 traps the second carrier signal, and outputs a first power supply DC from the inverting input terminal of the third operational amplifier M3, the output terminal of the third operational amplifier M3 and the first end of the eleventh resistor R11 to the drive circuit 52. The drive circuit 52 outputs a drive signal according to the first power supply DC and the second square wave signal to maintain the state of the light-emitting component.

[0135] When the transient reset switch circuit 10 disconnects the input AC power according to the operation, the auxiliary power supply circuit 20 outputs the auxiliary DC power to the anode of the fourth diode D4, the fourth diode D4 outputs the auxiliary DC power from the cathode of the fourth diode D4 to the second end of the first capacitor C1 and the cathode of the second diode D2, the collector of the first transistor Q1 and the first end of the third resistor R3 output a low level to the base of the first transistor Q1, the first transistor Q1 is turned off, and a third low level signal is output from the collector of the first transistor Q1 and the first end of the third resistor R3 to the first end of the fourth resistor R4, the second end of the fourth resistor R4 and the anode of the first diode D1 output a first low level signal to the first end of the fifth resistor R5 and the second end of the fifth resistor R6. The base of the diode Q2, the second end of the first capacitor C1 and the cathode of the second diode D2 output the first carrier signal, the inverting input end of the first operational amplifier M1 and the output end of the first operational amplifier M1 output the second low level signal to the communication circuit 51, the communication circuit 51 outputs a control signal to the drive circuit 52 according to the communication signal and / or the second low level signal, the trap circuit 43 traps the first carrier signal, and outputs the first power supply DC from the inverting input end of the third operational amplifier M3, the output end of the third operational amplifier M3 and the first end of the eleventh resistor R11 to the drive circuit 52, the drive circuit 52 outputs a drive signal according to the first power supply DC and the second low level signal to control the state of the light-emitting component.

[0136] like Fig. 9 As shown, when the transient reset switch circuit 10 transmits the input AC power normally, the AC-DC conversion circuit 60 converts the input AC power into a second power supply DC power to the auxiliary power supply circuit 20 and the positive electrode of the third diode D3, the negative electrode of the third diode D3 and the negative electrode of the fourth diode D4 output the second power supply DC power to the first end of the nineteenth resistor R19, the positive electrode of the fifth diode D5 and the first end of the fifteenth resistor R15 are connected to the input AC power, the second end of the eighteenth resistor R18 outputs a first square wave signal to the first end of the twentieth resistor R20, the second power supply DC power and the first square wave signal are superimposed, the output end of the fourth operational amplifier M4 and the first end of the twenty-first resistor R21 output a second carrier signal to the signal recovery circuit 42 and the trap circuit 43, and the working principles of other parts of the circuit are the same as those of FIG. Figure 8 The same is not repeated here.

[0137] When the transient reset switch circuit 10 disconnects the input AC power according to the operation, the second end of the eighteenth resistor R18 outputs the third low-level signal to the first end of the twentieth resistor R20, the auxiliary power supply circuit 20 outputs the auxiliary DC power to the positive electrode of the fourth resistor R4, the cathode of the third diode D3 and the cathode of the fourth diode D4 output the auxiliary DC power to the first end of the nineteenth resistor R19, the auxiliary DC power and the third low-level signal are superimposed, the output end of the fourth operational amplifier M4 and the first end of the twenty-first resistor R21 output the first carrier signal to the signal recovery circuit 42 and the trap circuit 43, and the working principle of the other parts of the circuit is the same as Figure 8 The same is not repeated here.

[0138] like Fig.10 As shown, when the transient reset switch circuit 10 transmits input AC power normally, the first end of the primary side of the transformer T1 and the second end of the primary side of the transformer T1 are connected to the input AC power, the transformer T1 steps down the input AC power, and outputs the stepped-down input AC power from the first end of the secondary side of the transformer T1 to the collector of the fourth transistor Q4 and the first end of the twenty-sixth resistor R26, the second end of the twenty-fourth resistor R24 ​​outputs the stepped-down and current-limited input AC power to the base of the sixth transistor Q6, the second end of the twenty-third resistor R23 and the first end of the twenty-fifth resistor R25 output the first square wave signal to the first end of the twentieth resistor R20, and the working principles of other parts of the circuit are the same as those of FIG. Figure 8 and Fig. 9 The same is not repeated here.

[0139] When the transient reset switch circuit 10 disconnects the input AC power according to the operation, the second end of the twenty-third resistor R23 and the first end of the twenty-fifth resistor R25 output a first low level signal to the first end of the twentieth resistor R20. The working principle of other parts of the circuit is the same as Figure 8 and Fig. 9 The same is not repeated here.

[0140] An embodiment of the present application also provides an electronic device, which includes the above-mentioned power supply circuit.

[0141] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0142] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A power supply circuit, characterized in that: Connect with the light emitting component, including: A transient reset switch circuit, used for connecting to an input AC power and disconnecting the input AC power for a first preset time period according to an operation; Auxiliary power supply circuit, used for outputting auxiliary direct current; a zero-crossing detection circuit, connected to the transient reset switch circuit, and configured to output a first low-level signal according to the disconnection of the input alternating current; a conversion circuit, connected to the auxiliary power supply circuit and the zero-crossing detection circuit, and configured to output a second low-level signal and a first power supply DC power according to the auxiliary DC power and the first low-level signal; A control circuit is connected to the conversion circuit and is used to control the state of the light-emitting component according to the second low-level signal and the first power supply DC.

2. The power supply circuit according to claim 1, characterized in that: Also includes: an AC-DC conversion circuit, connected to the transient reset switch circuit, the auxiliary power supply circuit and the zero-crossing detection circuit, and configured to convert the input AC power into a second supply DC power; The zero-crossing detection circuit is further used to perform zero-crossing detection on the input alternating current to output a first square wave signal; The conversion circuit is further used to output a second square wave signal and a first power supply DC power according to the second power supply DC power and the first square wave signal; The control circuit is further configured to maintain the state of the light-emitting component according to the first power supply DC power and the second square wave signal.

3. The power supply circuit according to claim 2, characterized in that: The zero-crossing detection circuit comprises: a zero-crossing detection module, connected to the AC-DC conversion circuit and the transient reset switch circuit, configured to output a third low-level signal according to the disconnection of the input AC power, and perform zero-crossing detection on the input AC power to output a third wave signal; The limiting module is connected to the zero-crossing detection module and the conversion circuit, and is used to limit the third low-level signal to output the first low-level signal; or to limit the third square wave signal to output the first square wave signal.

4. The power supply circuit according to claim 2, characterized in that: The conversion circuit comprises: a superposition circuit, connected to the AC / DC conversion circuit, the auxiliary power supply circuit and the zero-crossing detection circuit, and configured to superimpose the auxiliary DC power and the first low-level signal to output a first carrier signal, or superimpose the second power supply DC power and the first square wave signal to output a second carrier signal; a signal recovery circuit, connected to the superposition circuit, and configured to filter the first carrier signal to output the second low-level signal, or filter the second carrier signal to output the second square wave signal; A notch circuit is connected to the superposition circuit and the signal recovery circuit, and is used to notch the first carrier signal to output the first power supply DC power, or to notch the second carrier signal to output the first power supply DC power.

5. The power supply circuit according to claim 4, characterized in that: The signal recovery circuit includes a first operational amplifier, a tenth resistor and a second capacitor; The first end of the second capacitor serves as the first carrier signal input end and the second carrier signal input end of the signal recovery circuit, and is connected to the superposition circuit to input the first carrier signal and the second carrier signal; the second end of the second capacitor, the non-phase input end of the first operational amplifier and the first end of the tenth resistor are connected, the inverting input end of the first operational amplifier and the output end of the first operational amplifier jointly serve as the second low-level signal output end and the second square wave signal output end of the signal recovery circuit, and are connected to the control circuit to output the second low-level signal and the second square wave signal; the second end of the tenth resistor is connected to the third power supply.

6. The power supply circuit according to claim 4, characterized in that: The trap circuit includes a second operational amplifier, a third operational amplifier, a seventh resistor, an eighth resistor, a ninth resistor, an eleventh resistor, a twelfth resistor, a third capacitor, a fourth capacitor and a fifth capacitor; The first end of the third capacitor and the first end of the eighth resistor serve together as the first carrier signal input end and the second carrier signal input end of the trap circuit, and are connected to the superposition circuit and the signal recovery circuit to input the first carrier signal and the second carrier signal; the second end of the third capacitor, the first end of the fourth capacitor and the first end of the seventh resistor are connected, the second end of the eighth resistor, the first end of the ninth resistor and the first end of the fifth capacitor are connected, the second end of the fourth capacitor and the second end of the ninth resistor are connected to the positive phase input end of the third operational amplifier, the second end of the seventh resistor, the second end of the fifth capacitor, the inverting input end of the second operational amplifier and the output end of the second operational amplifier are connected, the inverting input end of the third operational amplifier, the output end of the third operational amplifier and the first end of the eleventh resistor serve together as the first power supply DC output end of the trap circuit, and are connected to the control circuit to output the first power supply DC; the second end of the eleventh resistor is connected to the first end of the twelfth resistor, and the positive phase input end of the second operational amplifier and the second end of the twelfth resistor are connected to the power ground.

7. The power supply circuit according to claim 2, characterized in that: Also includes: A selection circuit connected to the AC / DC conversion circuit, the auxiliary power supply circuit and the conversion circuit, and configured to select and output the DC power with a larger voltage between the second power supply DC power and the auxiliary DC power; Wherein, the voltage of the second power supply DC power is greater than or equal to the voltage of the auxiliary DC power.

8. The power supply circuit according to claim 2, characterized in that: The auxiliary power supply circuit comprises: a battery, for charging according to a charging voltage and outputting a battery voltage; A voltage conversion circuit is connected to the battery, the AC / DC conversion circuit and the conversion circuit, and is used to boost the battery voltage to output the auxiliary DC power, and convert the second supply DC power into the charging voltage to charge the battery.

9. The power supply circuit according to claim 1, characterized in that: The control circuit comprises: a communication circuit, connected to the conversion circuit, for receiving a communication signal and outputting a control signal according to the communication signal and / or the second low-level signal; A driving circuit is connected to the conversion circuit and the communication circuit, and is used to output a driving signal according to the first power supply DC and the control signal to control the state of the light-emitting component.

10. An electronic device, characterized in that: The invention comprises a power supply circuit as claimed in any one of claims 1 to 9.

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