Zero-power-consumption zero-fire power supply circuit in electronic switch

Abstract

The utility model discloses a zero-power-consumption zero-live-wire power supply circuit in an electronic switch, and provides a zero-live-wire power supply circuit for accessing a zero wire and a live wire, which can take electricity without depending on a single live wire, and avoids current fluctuation caused by load type change, thereby improving the stability of the circuit. Specifically, by adopting the zero-power-consumption power management module, extremely low power consumption or even zero power consumption in a standby state is realized, energy waste can be reduced, and energy conservation, emission reduction and environmental protection are facilitated. In addition, through cooperative work of the voltage feedback module and the zero-power-consumption power management module, the circuit can monitor and adjust the output voltage in real time, and the stability and precision of the output voltage are ensured. And the voltage feedback module receives a voltage signal of the DC voltage output end through a feedback voltage input end, and after internal processing, a feedback signal is sent to a feedback signal input end of the zero-power-consumption power management module through a feedback voltage output end, so that closed-loop control is formed, and the stability of the output voltage is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic switches, in particular to a zero-power consumption and zero-fire power supply circuit in an electronic switch. Background Art

[0002] Zero-live power supply means that devices such as smart switches are simultaneously connected to the live wire L line and the neutral wire N line for power supply. This method can provide more stable and purer electricity, which helps to protect the life of loads such as lamps.

[0003] Chinese patent publication number CN208508903U discloses a multi-control touch switch based on single live wire power supply, which comprises a microcontroller (1), a relay unit (4) and a single live wire power supply unit (3), wherein the input end of the microcontroller (1) is connected to the touch unit (2), and the output end of the microcontroller (1) is connected to the relay drive module (5), and a dual-control touch switch and a single-control touch switch are integrated on the same PCB board, so that single live wire power supply is realized, and different controls on the same load at different positions are realized, which meets people's use needs, is convenient and flexible to use, and adopts a touch control method, and weak current controls strong current, which is safe and reliable. However, the above switch mainly uses the technology of single live wire power supply, and in the single live wire power supply, the change of load type will cause the change of current, thereby causing the switch control circuit to work unstable. In addition, in the existing electronic switch design, the electronic switch still has a certain standby power consumption when it is turned off, which not only increases energy waste, but also is not conducive to environmental protection.

[0004] Therefore, how to overcome the above-mentioned defects has become an important issue to be solved urgently by those skilled in the art. Utility Model Content

[0005] The utility model overcomes the shortcomings of the above-mentioned technology and provides a zero-power consumption and zero-fire power supply circuit in an electronic switch.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A zero-power consumption and zero-live power supply circuit in an electronic switch comprises: a zero-power consumption power supply management module 1 and a voltage feedback module 2. The zero-power consumption power supply management module 1 is provided with a neutral line access terminal T100, a load / live line access terminal T200, a feedback signal input terminal FB, a power supply input terminal VCC, and a DC voltage output terminal T1. The voltage feedback module 2 is provided with a feedback voltage input terminal T21 connected to the DC voltage output terminal T1, a power supply input terminal T22 connected to the voltage input terminal VCC, and a feedback voltage output terminal T23 connected to the voltage feedback terminal FB, so as to monitor and adjust the output voltage through the voltage feedback module 2.

[0008] Preferably, the zero-power consumption power management module 1 comprises: a rectifier circuit 11 for converting AC power into DC power, a controlled buck circuit 12 for further reducing the voltage of the DC power output by the rectifier circuit 11, and a management control circuit 13 for controlling the controlled buck circuit 12 and performing power consumption management to achieve stable voltage output;

[0009] The management control circuit 13 includes: a zero-power consumption power management chip U2, a voltage converter T, a thirteenth diode D18, a sixth resistor R11, a seventh resistor R13, an eighth resistor R15, a ninth resistor R16, a sixth capacitor C6, a seventh capacitor C7, and an eighth capacitor C8. The GND pin of the zero-power consumption power management chip U2 is connected to the signal ground, the FB pin is used as the feedback signal input terminal FB, the VCC pin is used as the power supply input terminal VCC, and the DRAI The N pin is connected to the controlled buck circuit 12 as a control pin, the CS pin is connected to the signal ground through the ninth resistor R16, one end of the voltage converter T is connected to the signal ground, the other end of the voltage converter T is connected to one end of the sixth resistor R11 through the thirteenth diode D18 connected in the forward direction, the other end of the sixth resistor R11 is connected to the power supply input terminal VCC, the seventh resistor R13 is connected in parallel between the VCC pin and the FB pin of the zero-power power management chip U2, the seventh capacitor C7 is connected in parallel between the VCC pin and the GND pin of the zero-power power management chip U2, the sixth capacitor C6 and the eighth resistor R15 are connected in parallel between the FB pin and the GND pin of the zero-power power management chip U2, one end of the eighth capacitor C8 is connected to the other end of the voltage converter T, and the other end is grounded;

[0010] The controlled step-down circuit 12 comprises: a transformer T2, a sixth resistor R9, a twelfth diode D17, and an energy storage capacitor CE4, wherein an input end of the first coil N1 of the transformer T2 is connected to the rectifier circuit 11, another input end of the first coil N1 of the transformer T2 is connected to the DRAIN pin of the zero-power consumption power management chip U2, an output end of the second coil N2 of the transformer T2 is connected to the positive electrode of the twelfth diode D17, the negative electrode of the twelfth diode D17 serves as the DC voltage output end T1, another output end of the second coil N2 of the transformer T2 is grounded, the sixth resistor R9 and the energy storage capacitor CE4 are connected in parallel between the negative electrode of the twelfth diode D17 at an output end of the second coil N2 of the transformer T2 and the ground end, and the second coil N2 is coupled to the voltage converter T to provide power to the power supply input end VCC;

[0011] The rectifier circuit 11 includes a first rectifier bridge DB1, a varistor RV1, a fourth capacitor C4, a fifth capacitor C5, a first inductor L4, a fifth resistor R8, a fourteenth diode D19, and a fifteenth diode D20. The neutral line access terminal T100 is electrically connected to the DC voltage positive output terminal of the first rectifier bridge DB1 through the forward-connected fourteenth diode D19, and the DC voltage negative output terminal of the first rectifier bridge DB1 is sequentially connected through the forward-connected fifteenth diode D20, the forward-connected fourteenth diode D19, and the negative output terminal of the DC voltage of the first rectifier bridge DB1. It is connected to the positive DC voltage output end of the first rectifier bridge DB1, and the positive DC voltage output end of the first rectifier bridge DB1 is electrically connected to one end of the varistor RV1, one end of the fourth capacitor C4, one end of the first inductor L4, and one end of the fifth resistor R8 respectively. The connection point of one end of the fifth capacitor C5, the other end of the first inductor L4, and the other end of the fifth resistor R8 is electrically connected to the controlled step-down circuit 12 as the DC voltage high-voltage output end T3, and the other end of the varistor RV1, the other end of the fourth capacitor C4, and the other end of the fifth capacitor C5 are connected to the signal ground.

[0012] Preferably, the voltage feedback module 2 includes a sixteenth diode D22, a tenth resistor R21, an eleventh resistor R20, an optocoupler U3, and a twelfth resistor R22, the cathode of the sixteenth diode D22 being electrically connected to the DC voltage output terminal T1 as a feedback voltage input terminal T21, the anode of the sixteenth diode D22 being electrically connected to one end of the eleventh resistor R20 and the anode of the light-emitting diode of the optocoupler U3 through the tenth resistor R21, the other end of the eleventh resistor R20 and the cathode of the light-emitting diode of the optocoupler U3 being grounded, the collector of the phototransistor of the optocoupler U3 being electrically connected to the VCC terminal of the zero-power consumption power management module 1 as a power supply input terminal T22, and the emitter being electrically connected to the voltage feedback terminal FB of the zero-power consumption power management chip U2 as a feedback voltage output terminal T23.

[0013] Preferably, the sixteenth diode D22 is a Zener diode.

[0014] Preferably, the rectifier circuit 11 also includes: one or more second rectifier bridges DB2, an AC voltage input terminal of each of the second rectifier bridges DB2 is electrically connected to a load / live wire access terminal T200, a DC voltage positive output terminal and a DC voltage negative output terminal of each of the second rectifier bridges DB2 are connected to an input terminal of the first coil N1 of the transformer T2 through a first inductor L4, and a current limiting resistor 110 is provided between the load / live wire access terminal T200 and the second rectifier bridge DB2.

[0015] Preferably, it also includes: a neutral line access protection module 3, the neutral line access protection module 3 includes: a neutral line access interface 31 for neutral line access, a second fuse F2, and a fifteenth resistor R7, the second fuse F2 is electrically connected between the neutral line access interface 31 and one end of the fifteenth resistor R7, and the other end of the fifteenth resistor R7 serves as a neutral line access terminal T100.

[0016] Preferably, it also includes: a zero line access detection module 4 connected to the zero line access terminal T100 for detecting whether the zero line is connected, and a control module 5 electrically connected to the zero line detection signal output terminal of the zero line access detection module 4;

[0017] The neutral line access detection module 4 includes: a seventeenth diode D21, a thirteenth resistor R17, a fourteenth resistor R18, a ninth capacitor C9, and a transistor Q2. The positive electrode of the seventeenth diode D21 is electrically connected to the neutral line access terminal T100, and the negative electrode is connected to one end of the fourteenth resistor R18 through the thirteenth resistor R17. The other end of the fourteenth resistor R18 is respectively electrically connected to one end of the ninth capacitor C9 and the base of the transistor Q2. The other end of the ninth capacitor C9 and the emitter of the transistor Q2 are grounded. The collector of the transistor Q2 is electrically connected to the control module 5 as the neutral line detection signal output terminal T5.

[0018] Preferably, a zero line detection signal protection module 6 is electrically connected between the zero line detection signal output terminal T5 and the control module 5, and the zero line detection signal protection module 6 includes: a sixteenth resistor R27, a seventeenth resistor R23, a tenth capacitor C28, and a second bidirectional diode TV11, one end of the sixteenth resistor R27 is connected to the zero line detection signal output terminal T5, and the other end of the sixteenth resistor R27 is respectively electrically connected to one end of the seventeenth resistor R23, one end of the tenth capacitor C28, and one end of the second bidirectional diode TV11 to form a second connection point T6, the other end of the seventeenth resistor R23 is electrically connected to the external power supply end, the other end of the tenth capacitor C28 and the other end of the second bidirectional diode TV11 are grounded, and the second connection point T6 is electrically connected to the detection input end of the control module 5.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] 1. This case provides a zero-live power supply circuit for zero-live wire access, which can be independent of a single live wire for power supply, avoiding current fluctuations caused by changes in load types, thereby improving the stability of the circuit. Specifically, by adopting a zero-power power management module, extremely low or even zero power consumption is achieved in standby mode, which can reduce energy waste and is conducive to energy conservation, emission reduction and environmental protection. In addition, through the coordinated work of the voltage feedback module and the zero-power power management module, the circuit can monitor and adjust the output voltage in real time to ensure the stability and accuracy of the output voltage. The voltage feedback module receives the voltage signal of the DC voltage output terminal through the feedback voltage input terminal, and after internal processing, sends the feedback signal to the feedback signal input terminal of the zero-power power management module through the feedback voltage output terminal, forming a closed-loop control, further improving the stability of the output voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic block diagram of the first embodiment of this case.

[0022] Figure 2 It is a circuit diagram of the first embodiment of the present invention.

[0023] Figure 3 It is a schematic structural block diagram of the second embodiment of the present invention.

[0024] Figure 4 This is the circuit diagram of the neutral line access detection module in this case.

[0025] Figure 5 This is the circuit diagram of the neutral line detection signal protection module in this case.

[0026] Figure 6 This is the circuit diagram of the control module in this case.

[0027] Figure 7 It is a structural schematic block diagram of the third embodiment of this case. DETAILED DESCRIPTION

[0028] The following examples further illustrate the features of the present invention and other related features to facilitate understanding by those skilled in the art:

[0029] Embodiment 1

[0030] like Figure 1 to Figure 2As shown, the zero-power consumption and zero-live power supply circuit in the electronic switch is characterized in that it includes: a zero-power consumption power supply management module 1 and a voltage feedback module 2. The zero-power consumption power supply management module 1 is provided with a neutral line access terminal T100, a load / live line access terminal T200, a feedback signal input terminal FB, a power supply input terminal VCC, and a DC voltage output terminal T1. The voltage feedback module 2 is provided with a feedback voltage input terminal T21 connected to the DC voltage output terminal T1, a power supply input terminal T22 connected to the voltage input terminal VCC, and a feedback voltage output terminal T23 connected to the voltage feedback terminal FB, so as to monitor and adjust the output voltage through the voltage feedback module 2.

[0031] As described above, the present case provides a zero-live power supply circuit for zero-live wire access, which can be independent of a single live wire for power supply, avoids current fluctuations caused by changes in load types, and thus improves the stability of the circuit. Specifically, by adopting a zero-power power management module 1, extremely low power consumption or even zero power consumption is achieved in standby mode, which can reduce energy waste, and is conducive to energy conservation, emission reduction and environmental protection. In addition, through the coordinated work of the voltage feedback module 2 and the zero-power power management module 1, the circuit can monitor and adjust the output voltage in real time to ensure the stability and accuracy of the output voltage. The voltage feedback module 2 receives the voltage signal of the DC voltage output terminal T1 through the feedback voltage input terminal T21, and after internal processing, sends the feedback signal to the feedback signal input terminal FB of the zero-power power management module 1 through the feedback voltage output terminal T23, forming a closed-loop control, and further improving the stability of the output voltage.

[0032] like Figure 2 As shown, in a specific implementation, the zero-power consumption power management module 1 includes: a rectifier circuit 11 for converting AC power into DC power, a controlled buck circuit 12 for further reducing the voltage of the DC power output by the rectifier circuit 11, and a management control circuit 13 for controlling the controlled buck circuit 12 and performing power consumption management to achieve stable voltage output;

[0033] The management control circuit 13 includes: a zero-power consumption power management chip U2, a voltage converter T, a thirteenth diode D18, a sixth resistor R11, a seventh resistor R13, an eighth resistor R15, a ninth resistor R16, a sixth capacitor C6, a seventh capacitor C7, and an eighth capacitor C8. The GND pin of the zero-power consumption power management chip U2 is connected to the signal ground, the FB pin is used as the feedback signal input terminal FB, the VCC pin is used as the power supply input terminal VCC, and the DRAI The N pin is connected to the controlled buck circuit 12 as a control pin, the CS pin is connected to the signal ground through the ninth resistor R16, one end of the voltage converter T is connected to the signal ground, the other end of the voltage converter T is connected to one end of the sixth resistor R11 through the thirteenth diode D18 connected in the forward direction, the other end of the sixth resistor R11 is connected to the power supply input terminal VCC, the seventh resistor R13 is connected in parallel between the VCC pin and the FB pin of the zero-power power management chip U2, the seventh capacitor C7 is connected in parallel between the VCC pin and the GND pin of the zero-power power management chip U2, the sixth capacitor C6 and the eighth resistor R15 are connected in parallel between the FB pin and the GND pin of the zero-power power management chip U2, one end of the eighth capacitor C8 is connected to the other end of the voltage converter T, and the other end is grounded;

[0034] The controlled step-down circuit 12 comprises: a transformer T2, a sixth resistor R9, a twelfth diode D17, and an energy storage capacitor CE4, wherein an input end of the first coil N1 of the transformer T2 is connected to the rectifier circuit 11, another input end of the first coil N1 of the transformer T2 is connected to the DRAIN pin of the zero-power consumption power management chip U2, an output end of the second coil N2 of the transformer T2 is connected to the positive electrode of the twelfth diode D17, the negative electrode of the twelfth diode D17 serves as the DC voltage output end T1, another output end of the second coil N2 of the transformer T2 is grounded, the sixth resistor R9 and the energy storage capacitor CE4 are connected in parallel between the negative electrode of the twelfth diode D17 at an output end of the second coil N2 of the transformer T2 and the ground end, and the second coil N2 is coupled to the voltage converter T to provide power to the power supply input end VCC;

[0035] The rectifier circuit 11 includes a first rectifier bridge DB1, a varistor RV1, a fourth capacitor C4, a fifth capacitor C5, a first inductor L4, a fifth resistor R8, a fourteenth diode D19, and a fifteenth diode D20. The neutral line access terminal T100 is electrically connected to the DC voltage positive output terminal of the first rectifier bridge DB1 through the forward-connected fourteenth diode D19, and the DC voltage negative output terminal of the first rectifier bridge DB1 is sequentially connected through the forward-connected fifteenth diode D20, the forward-connected fourteenth diode D19, and the negative output terminal of the DC voltage of the first rectifier bridge DB1. The DC voltage positive output terminal of the first rectifier bridge DB1 is connected to the positive output terminal of the DC voltage of the first rectifier bridge DB1, and the positive output terminal of the DC voltage of the first rectifier bridge DB1 is electrically connected to one end of the varistor RV1, one end of the fourth capacitor C4, one end of the first inductor L4, and one end of the fifth resistor R8 respectively. The connection point of one end of the fifth capacitor C5, the other end of the first inductor L4, and the other end of the fifth resistor R8 is electrically connected to the controlled step-down circuit 12 as the DC voltage high-voltage output terminal T3, and the other end of the varistor RV1, the other end of the fourth capacitor C4, and the other end of the fifth capacitor C5 are connected to the signal ground. In specific implementation, since the DRAIN pin of the zero-power power management chip U2 is connected to the other input end of the first coil N1 of the transformer T2, by controlling the state of the DRAIN pin, the working state of the transformer T2 can be affected, thereby controlling the magnitude of the output voltage.

[0036] In addition, the zero-power power management chip U2 also receives a feedback signal through the FB pin, adjusts its working state according to the feedback signal, and achieves stable and precise control of the output voltage.

[0037] As described above, the zero-power power management module 1 of this case converts AC power into DC power through the rectifier circuit 11, and further adjusts the voltage using the controlled step-down circuit 12 to achieve efficient energy conversion and utilization. The management control circuit 13 can intelligently control and manage power consumption through its zero-power power management chip U2, ensuring that the power consumption is extremely low or even zero when the device is not working, thereby improving energy utilization efficiency. And by utilizing the coordinated work of the voltage feedback module 2 and the management control circuit 13, the output voltage is monitored and adjusted in real time to ensure the stability and accuracy of the output voltage and provide a stable power supply for the device. Specifically, the rectifier circuit 11 is convenient for converting AC power into DC power through the setting of its first rectifier bridge DB1, providing a stable DC voltage for the circuit; through the setting of the varistor RV1, it can quickly turn on when the voltage is abnormal, protect the circuit, and prevent overvoltage from damaging the components in the circuit; through the setting of the first inductor L4 and the fifth capacitor C5, a filter circuit is formed to filter out ripples and noise in the power supply, which is conducive to improving the stability and reliability of the output voltage. The controlled buck circuit 12 realizes voltage conversion through the setting of transformer T2 and its first coil N1 and second coil N2; and through the precise control of the coil ratio of transformer T2 and zero-power power management chip U2, the controlled buck circuit 12 can accurately adjust the output voltage to ensure stable power supply for the device; through the setting of diode D17, the controlled buck circuit 12 reduces energy loss in the buck process and improves the energy efficiency of the overall circuit. By adding the energy storage capacitor CE4, the circuit can respond quickly when the load changes, maintain the stability of the output voltage, and improve the stability of the circuit; and the sixth resistor R9 is connected in parallel with the energy storage capacitor CE4 to provide overcurrent protection when the circuit is abnormal, prevent circuit damage, and enhance the safety of the circuit. The zero-power management chip U2 of the management control circuit 13 monitors the output voltage in real time through its FB pin, and transmits the feedback signal to the zero-power management chip U2 through the feedback network composed of the seventh resistor R13, the sixth capacitor C6, and the eighth resistor R15, so that the chip U2 can intelligently adjust the output voltage according to the feedback signal, which is conducive to ensuring the stability and accuracy of the output voltage; the setting of the voltage converter T and the coupling setting of the second coil N2 and the voltage converter T, the controlled buck circuit 12 can provide power to the power supply input terminal VCC, realize the self-power supply function of the circuit, and further reduce the power consumption of the overall circuit; and can further convert the voltage output from the controlled buck circuit 12 into an output of another voltage level, so that the zero-power management module 1 of this case can accurately adjust the voltage according to the specific needs of the load, which not only allows the circuit to adapt to different input voltages and load requirements, but also reduces unnecessary energy waste and improves energy utilization efficiency.In addition, the voltage converter T can also help control the stability of the output voltage and prevent the output voltage from changing due to input voltage fluctuations or load changes.

[0038] like Figure 2 As shown, the voltage feedback module 2 includes a sixteenth diode D22, a tenth resistor R21, an eleventh resistor R20, an optocoupler U3, and a twelfth resistor R22. The cathode of the sixteenth diode D22 is electrically connected to the DC voltage output terminal T1 as a feedback voltage input terminal T21, and the anode of the sixteenth diode D22 is electrically connected to one end of the eleventh resistor R20 and the anode of the light-emitting diode of the optocoupler U3 through the tenth resistor R21. The other end of the eleventh resistor R20 and the cathode of the light-emitting diode of the optocoupler U3 are grounded. The collector of the phototransistor of the optocoupler U3 is electrically connected to the VCC terminal of the zero-power consumption power management module 1 as a power supply input terminal T22, and the emitter is electrically connected to the voltage feedback terminal FB of the zero-power consumption power management chip U2 as a feedback voltage output terminal T23. Wherein, the sixteenth diode D22 is a Zener diode. In specific implementation, when the voltage at the DC voltage output terminal T1 changes, the voltage feedback module 2 will receive the voltage change signal, and convert the change in output voltage into a current change on the light-emitting diode of the optocoupler U3 through the voltage-dividing effect of the tenth resistor R21 and the eleventh resistor R20. The light-emitting diode of the optocoupler U3 converts the current change into an optical signal, and then converts the optical signal into an electrical signal through its phototransistor, thereby realizing isolated transmission from the output voltage terminal to the zero-power power management chip U2. Since the collector of the phototransistor of the optocoupler U3 is connected to the VCC pin and the FB pin of the zero-power power management chip U2 as the power supply input terminal T22 and the emitter as the feedback voltage output terminal T23, respectively, when the output voltage changes, the current change on the phototransistor will be reflected to the FB pin, thereby triggering the zero-power power management chip U2 to make corresponding adjustments to keep the output voltage stable.

[0039] As described above, the voltage feedback module 2 of this case can monitor the voltage change of the DC voltage output terminal T1 in real time through the combination of the sixteenth diode D22, the tenth resistor R21, and the eleventh resistor R20, so that the zero-power power management chip U2 can quickly adjust according to the fluctuation of the output voltage to maintain the stability of the output voltage. The sixteenth diode D22 is a Zener diode. Due to the voltage-stabilizing characteristics of the Zener diode, it can keep the voltage almost constant when the reverse voltage reaches its breakdown voltage, so that the circuit can adapt to changes in different loads and input voltages, so that the circuit can maintain the stability of the output voltage through the regulation of the Zener diode, thereby enhancing the adaptability and flexibility of the circuit. In addition, since the reverse resistance of the Zener diode drops sharply after breakdown, it can quickly guide the excessive voltage to the ground line to protect the circuit from overvoltage damage. The optocoupler U3 can be used as a feedback element, which simplifies the circuit and realizes the transmission of feedback signals from the output voltage end to the power management chip. Moreover, through the feedback signal transmitted by the optocoupler U3, the power management chip U2 can understand the state of the output voltage in real time and make adjustments as needed, which is beneficial to ensure that the output voltage always remains in a stable state, thereby optimizing the power supply efficiency.

[0040] like Figure 2 As shown, in the specific implementation, the zero-power consumption and zero-fire power supply circuit of this case also includes: a zero-line access protection module 3, and the zero-line access protection module 3 includes: a zero-line access interface 31 for zero-line access, a second fuse F2, and a fifteenth resistor R7, wherein the second fuse F2 is electrically connected between the zero-line access interface 31 and one end of the fifteenth resistor R7, and the other end of the fifteenth resistor R7 serves as a zero-line access terminal T100. In this way, by setting the zero-line access protection module 3 and its second fuse F2 in the zero-power consumption and zero-fire power supply circuit, on the one hand, when the current in the circuit exceeds the preset rated value, F2 will quickly blow and cut off the circuit, thereby avoiding damage to the zero-line access interface 31 and its subsequent circuits due to overcurrent, thereby achieving overcurrent protection; on the other hand, when a short circuit occurs in the circuit, F2 will also quickly blow, thereby blocking the short-circuit current and playing a role in short-circuit protection.

[0041] like Figure 2As shown, in a specific implementation, the peripheral circuit also includes: one or more second rectifier bridges DB2, an AC voltage input end of each of the second rectifier bridges DB2 is electrically connected to a load / live line access end T200, and the DC voltage positive output end and the DC voltage negative output end of each of the second rectifier bridges DB2 are connected to an input end of the first coil N1 of the transformer T2 through the first inductor L4, and a current limiting resistor 110 is provided between the load / live line access end T200 and the second rectifier bridge DB2. In a specific implementation, the load / live line access end T200 has three loads L1, L2, and L3, L1 is connected to the first rectifier bridge DB2, and L2 and L3 are connected to the second rectifier bridge DB2. In this way, one or more AC power can be converted into DC power through one or more second rectifier bridges DB2, and then input into the transformer T2 together, so that multiple loads can be powered simultaneously. Moreover, by setting a current limiting resistor between the load / live wire access terminal and the rectifier bridge, the current flowing into the rectifier bridge can be limited to prevent safety accidents such as circuit damage or fire caused by overcurrent.

[0042] Embodiment 2

[0043] like Figures 3 to 6 As shown, the difference between the second embodiment and the first embodiment is:

[0044] The zero-power consumption zero-fire power supply circuit of the present invention further includes: a zero-line access detection module 4 connected to the zero-line access terminal T100 for detecting whether the zero line is connected, and a control module 5 electrically connected to the zero-line detection signal output terminal of the zero-line access detection module 4;

[0045] The zero line access detection module 4 includes: a seventeenth diode D21, a thirteenth resistor R17, a fourteenth resistor R18, a ninth capacitor C9, and a transistor Q2. The positive electrode of the seventeenth diode D21 is electrically connected to the zero line access terminal T100, and the negative electrode is connected to one end of the fourteenth resistor R18 through the thirteenth resistor R17. The other end of the fourteenth resistor R18 is electrically connected to one end of the ninth capacitor C9 and the base of the transistor Q2 respectively. The other end of the ninth capacitor C9 and the emitter of the transistor Q2 are grounded. The collector of the transistor Q2 is electrically connected to the control module 5 as the zero line detection signal output terminal T5. In specific implementation, when there is a voltage input to the zero line access terminal T100, the seventeenth diode D21 is turned on, and through the voltage dividing effect of the thirteenth resistor R17 and the fourteenth resistor R18, sufficient bias voltage is provided to the base of the transistor Q2, so that Q2 is turned on. In this way, the collector of the transistor Q2, i.e., the neutral line signal output terminal T5, will output a signal indicating that the neutral line has been connected to the control module 5. In this way, through the setting of the neutral line connection detection module 4, it is possible to accurately detect whether the neutral line has been correctly connected, so that the control module 5 can intelligently control the start, shut down or adjust the working state of the circuit according to the signal output by the neutral line connection detection module 4, so that the circuit can be adaptively adjusted according to the actual situation.

[0046] Embodiment 3

[0047] like Figure 3 and Figure 7 As shown, in specific implementation, the difference between the third embodiment and the second embodiment is:

[0048] A zero line detection signal protection module 6 is electrically connected between the zero line detection signal output terminal T5 and the control module 5, and the zero line detection signal protection module 6 includes: a sixteenth resistor R27, a seventeenth resistor R23, a tenth capacitor C28, and a second bidirectional diode TV11. One end of the sixteenth resistor R27 is connected to the zero line detection signal output terminal T5, and the other end of the sixteenth resistor R27 is electrically connected to one end of the seventeenth resistor R23, one end of the tenth capacitor C28, and one end of the second bidirectional diode TV11 to form a second connection point T6. The other end of the seventeenth resistor R23 is connected to the external power supply end, and the other end of the tenth capacitor C28 and the other end of the second bidirectional diode TV11 are grounded. The second connection point T6 is electrically connected to the detection input end of the control module 5. The control module can be a common single-chip circuit, and the control module can also be connected to an external display device to display whether the zero line is connected. A controlled switch can also be connected between the control module 5 and the zero-power consumption power management module 1.

[0049] As described above, in this case, a zero-line detection signal protection module 6 is set in the zero-power zero-fire power supply circuit, and an electrical connection is realized between the zero-line detection signal output terminal T5 and the control module 5, so as to ensure the stable transmission of the zero-line detection signal and ensure the signal transmission quality. Specifically, through the combination of the sixteenth resistor R27, the seventeenth resistor R23 and the tenth capacitor C28, a basic RC filter circuit is formed to filter out the high-frequency noise and interference in the zero-line detection signal, thereby enhancing the stability and reliability of the signal. Moreover, the setting of the sixteenth resistor R27 and the seventeenth resistor R23 can realize the voltage division effect to adjust the amplitude of the signal, ensure that the control module 5 can receive the signal amplitude suitable for its processing, and avoid the misjudgment or failure caused by the signal amplitude being too large or too small. The setting of the tenth capacitor C28 can prevent the excessive voltage from being directly transmitted to the control module 5 by absorbing excess energy when the voltage at the zero-line detection signal output terminal T5 is too high, thereby playing a certain overvoltage protection role. The second bidirectional diode TV11 is configured to be turned on when the voltage at the neutral line detection signal output terminal T5 is higher or lower than a preset safety threshold, thereby guiding the excess voltage or negative voltage to the ground line, thereby playing a bidirectional overvoltage protection role.

[0050] As mentioned above, the term "zero power consumption" in this case is generally a relative concept in the field of electronics and power management, and does not mean that the device or system has no power consumption at all. The "zero power consumption" in this case aims to significantly reduce the power consumption of the device in a specific mode such as standby mode, sleep mode or shutdown mode to approach or reach a power consumption level close to zero.

[0051] As mentioned above, this case protects a zero-power consumption and zero-fire power supply circuit in an electronic switch. All technical solutions that are the same or similar to this case should be deemed to fall within the protection scope of this case.

Claims

1. Zero power consumption and zero fire power supply circuit in electronic switch, characterized by include: A zero-power consumption power management module (1) and a voltage feedback module (2), wherein the zero-power consumption power management module (1) is provided with a neutral line access terminal (T100), a load / live line access terminal (T200), a feedback signal input terminal FB, a power supply input terminal VCC, and a DC voltage output terminal (T1); and the voltage feedback module (2) is provided with a feedback voltage input terminal (T21) connected to the DC voltage output terminal (T1), a power supply input terminal (T22) connected to the voltage input terminal VCC, and a feedback voltage output terminal (T23) connected to the voltage feedback terminal FB, so as to monitor and adjust the output voltage through the voltage feedback module (2).

2. The zero-power consumption zero-fire power supply circuit according to claim 1 is characterized in that The zero-power consumption power management module (1) comprises: a rectifier circuit (11) for converting alternating current into direct current, a controlled step-down circuit (12) for further stepping down the direct current output by the rectifier circuit (11), and a management control circuit (13) for controlling the controlled step-down circuit (12) and performing power consumption management to achieve stable voltage output; The management control circuit (13) comprises: a zero-power consumption power management chip U2, a voltage converter T, a thirteenth diode D18, a sixth resistor R11, a seventh resistor R13, an eighth resistor R15, a ninth resistor R16, a sixth capacitor C6, a seventh capacitor C7, and an eighth capacitor C8, wherein a GND pin of the zero-power consumption power management chip U2 is connected to a signal ground, an FB pin is used as a feedback signal input terminal FB, a VCC pin is used as a power supply input terminal VCC, a DRAIN pin is used as a control pin and is connected to a controlled step-down circuit (12), a CS pin is connected to a signal ground via a ninth resistor R16, one end of the voltage converter T is connected to the signal ground, and the voltage converter T is connected to the signal ground. The other end of the voltage converter T is connected to one end of the sixth resistor R11 through a forward-connected thirteenth diode D18, the other end of the sixth resistor R11 is connected to the power supply input terminal VCC, the seventh resistor R13 is connected in parallel between the VCC pin and the FB pin of the zero-power consumption power management chip U2, the seventh capacitor C7 is connected in parallel between the VCC pin and the GND pin of the zero-power consumption power management chip U2, the sixth capacitor C6 and the eighth resistor R15 are connected in parallel between the FB pin and the GND pin of the zero-power consumption power management chip U2, one end of the eighth capacitor C8 is connected to the other end of the voltage converter T, and the other end is grounded; The controlled step-down circuit (12) comprises: a transformer T2, a sixth resistor R9, a twelfth diode D17, and an energy storage capacitor CE4; an input end of a first coil N1 of the transformer T2 is connected to the rectifier circuit (11); another input end of the first coil N1 of the transformer T2 is connected to a DRAIN pin of a zero-power consumption power management chip U2; an output end of a second coil N2 of the transformer T2 is connected to a positive electrode of a twelfth diode D17; a negative electrode of the twelfth diode D17 serves as a DC voltage output end (T1); another output end of the second coil N2 of the transformer T2 is grounded; the sixth resistor R9 and the energy storage capacitor CE4 are connected in parallel between an output end of the second coil N2 of the transformer T2 and a negative electrode of the twelfth diode D17 and a ground end; and the second coil N2 is coupled to a voltage converter T; The rectifier circuit (11) comprises a first rectifier bridge DB1, a varistor RV1, a fourth capacitor C4, a fifth capacitor C5, a first inductor L4, a fifth resistor R8, a fourteenth diode D19, and a fifteenth diode D20, wherein the neutral line access terminal (T100) is electrically connected to the positive output terminal of the DC voltage of the first rectifier bridge DB1 through the forward-connected fourteenth diode D19, and the negative output terminal of the DC voltage of the first rectifier bridge DB1 is sequentially connected through the forward-connected fifteenth diode D20 and the forward-connected fourteenth diode D19. The DC voltage positive output terminal of the first rectifier bridge DB1 is connected to the DC voltage positive output terminal, and the DC voltage positive output terminal of the first rectifier bridge DB1 is electrically connected to one end of the varistor RV1, one end of the fourth capacitor C4, one end of the first inductor L4, and one end of the fifth resistor R8 respectively. The connection point of one end of the fifth capacitor C5, the other end of the first inductor L4, and the other end of the fifth resistor R8 is electrically connected to the controlled step-down circuit (12) as the DC voltage high-voltage output terminal (T3), and the other end of the varistor RV1, the other end of the fourth capacitor C4, and the other end of the fifth capacitor C5 are connected to the signal ground.

3. The zero-power consumption zero-fire power supply circuit according to claim 1 or 2, characterized in that The voltage feedback module (2) comprises a sixteenth diode D22, a tenth resistor R21, an eleventh resistor R20, an optocoupler U3, and a twelfth resistor R22; the cathode of the sixteenth diode D22 is electrically connected to the DC voltage output terminal (T1) as a feedback voltage input terminal (T21); the anode of the sixteenth diode D22 is electrically connected to one end of the eleventh resistor R20 and the anode of the light-emitting diode of the optocoupler U3 through the tenth resistor R21; the other end of the eleventh resistor R20 and the cathode of the light-emitting diode of the optocoupler U3 are grounded; the collector of the phototransistor of the optocoupler U3 is electrically connected to the VCC terminal of the zero-power consumption power management module (1) as a power supply input terminal (T22); and the emitter is electrically connected to the voltage feedback terminal FB of the zero-power consumption power management chip U2 as a feedback voltage output terminal (T23).

4. The zero-power consumption and zero-fire power supply circuit according to claim 3 is characterized in that The sixteenth diode D22 is a Zener diode.

5. The zero-power consumption zero-fire power supply circuit according to claim 2 is characterized in that The rectifier circuit (11) further comprises: one or more second rectifier bridges DB2, an AC voltage input terminal of each second rectifier bridge DB2 being electrically connected to a load / live line access terminal (T200), a DC voltage positive output terminal and a DC voltage negative output terminal of each second rectifier bridge DB2 being connected to an input terminal of a first coil N1 of a transformer T2 via a first inductor L4, and a current limiting resistor (110) being provided between the load / live line access terminal (T200) and the second rectifier bridge DB2.

6. The zero-power consumption zero-fire power supply circuit according to claim 1 is characterized in that The invention also comprises: a neutral line access protection module (3), wherein the neutral line access protection module (3) comprises: a neutral line access interface (31) for accessing the neutral line, a second fuse F2, and a fifteenth resistor R7, wherein the second fuse F2 is electrically connected between the neutral line access interface (31) and one end of the fifteenth resistor R7, and the other end of the fifteenth resistor R7 serves as a neutral line access end (T100).

7. The zero-power consumption zero-fire power supply circuit according to claim 1 is characterized in that Also includes: A zero line access detection module (4) connected to the zero line access terminal (T100) and used to detect whether the zero line is connected, and a control module (5) electrically connected to the zero line detection signal output terminal of the zero line access detection module (4); The neutral line access detection module (4) comprises: a seventeenth diode D21, a thirteenth resistor R17, a fourteenth resistor R18, a ninth capacitor C9, and a transistor Q2. The positive electrode of the seventeenth diode D21 is electrically connected to the neutral line access terminal (T100), and the negative electrode is connected to one end of the fourteenth resistor R18 through the thirteenth resistor R17. The other end of the fourteenth resistor R18 is electrically connected to one end of the ninth capacitor C9 and the base of the transistor Q2 respectively. The other end of the ninth capacitor C9 and the emitter of the transistor Q2 are grounded. The collector of the transistor Q2 is electrically connected to the control module (5) as a neutral line detection signal output terminal (T5).

8. The zero-power consumption zero-fire power supply circuit according to claim 7, characterized in that A zero line detection signal protection module (6) is electrically connected between the zero line detection signal output terminal (T5) and the control module (5), and the zero line detection signal protection module (6) comprises: a sixteenth resistor R27, a seventeenth resistor R23, a tenth capacitor C28, and a second bidirectional diode TV11, one end of the sixteenth resistor R27 is connected to the zero line detection signal output terminal (T5), the other end of the sixteenth resistor R27 is electrically connected to one end of the seventeenth resistor R23, one end of the tenth capacitor C28, and one end of the second bidirectional diode TV11 to form a second connection point (T6), the other end of the seventeenth resistor R23 is electrically connected to the external power supply terminal, the other end of the tenth capacitor C28 and the other end of the second bidirectional diode TV11 are grounded, and the second connection point (T6) is electrically connected to the detection input terminal of the control module (5).

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