Power supply device capable of converting zero fire switch into single live wire

Abstract

The utility model discloses a zero-fire switch to single live wire power supply, which belongs to the technical field of zero-fire switch to single live wire power supply, and comprises a flash arrester and a switch connector, the circuit of the flash arrester comprises a first rectification circuit, the output of the first rectification circuit is connected with the drain electrode of an MOS tube Q1, the grid electrode of the MOS tube Q1 is connected with the first end of a fourth resistor R4, and the second end of the fourth resistor R4 is connected with the drain electrode of the MOS tube Q1. The source electrode of the MOS tube Q1 is grounded through a sixth resistor R6 and is connected with a voltage detection circuit; the output of the voltage detection circuit is connected with the input of the comparison circuit, and the output of the comparison circuit is connected with the grid electrode of the MOS tube Q1; the voltage detection circuit detects the voltage on the sixth resistor R6 and outputs the detected data to the comparison circuit; and the comparison circuit receives the detection data sent by the voltage detection circuit, and outputs and controls whether the MOS tube Q1 is switched on or not according to whether the detection data is within a set threshold range or not. By means of the circuit, the stroboscopic problem of the zero-fire central control screen switch with large power consumption when the lamp is turned off is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of zero-fire switch to single-live-wire power supply, and in particular relates to a zero-fire switch to single-live-wire power supply device. Background Art

[0002] At present, most wall switches use single live wire wiring (no neutral wire). With the popularization of smart IoT devices, most devices that realize intelligent control of lamps use zero live wire power supply, such as central control panel switches and PLC smart switches. Using zero live wire power supply improves the working stability of equipment and reduces costs. Directly using a single live wire module for power supply is suitable for low-power devices and it is difficult to optimize the communication module to work in a low-power state. There are also some zero-fire switch to single live wire power supply devices on the market. However, when in use, the size is large and the wiring is cumbersome, which is easy to cause lamp flicker and high-frequency noise affecting use. Therefore, a zero-fire switch to single live wire power supply device is invented to facilitate on-site technicians to install the zero-fire switch in single live wiring situations without neutral wires, and realize the power supply stability of zero-fire power supply intelligent control equipment, which is of great significance. Utility Model Content

[0003] The purpose of the utility model is to provide a zero-fire switch to single-live power supply. This application uses modern micro-control electronic technology to achieve precise power extraction without generating excess power loss, interfering with the power grid, or affecting the service life of the load. The zero-fire switch to single-live power supply includes a lamp flash suppressor and a switch connector. When in use, the switch connector is installed at both ends of the intelligent zero-fire switch N-L1 without distinguishing polarity. The flash suppressor is installed at both ends of the NL live wire of the load without distinguishing polarity. The load with the flash suppressor installed is connected to the N line terminal of the intelligent zero-fire switch. This application facilitates on-site technicians to install the zero-fire switch in a single-live wiring situation without a zero line, so as to achieve stable power supply for the zero-fire power supply intelligent control equipment.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a zero-fire switch to single-fire power supply, including a flash extinguisher and a switch connector, the flash extinguisher is installed at both ends of the NL fire line of the lamp load without distinguishing polarity, the load installed with the flash extinguisher is connected to the N line terminal of the intelligent zero-fire switch, and the switch connector is installed at both ends of the intelligent zero-fire switch N-L1 without distinguishing polarity, characterized in that the circuit of the flash extinguisher includes a first rectifier circuit that converts alternating current into direct current, the output of the first rectifier circuit is connected to the drain of the MOS tube Q1, the gate of the MOS tube Q1 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected to the drain of the MOS tube Q1, the source of the MOS tube Q1 is grounded through the sixth resistor R6, and the source of the MOS tube Q1 is connected to the voltage detection circuit; the output of the voltage detection circuit is connected to the input of the comparison circuit, and the output of the comparison circuit is connected to the gate of the MOS tube Q1; the voltage detection circuit detects the voltage on the sixth resistor R6, and outputs the detected data to the comparison circuit;

[0005] The comparison circuit receives the detection data sent by the voltage detection circuit, and outputs whether the MOS tube Q1 is turned on or not according to whether the detection data is within a set threshold range.

[0006] The flash suppressor of the present application solves the problem of frequent flickering of lamps and the installation of a zero-fire switch on a single-live-wire power supply through the above-mentioned circuit structure design.

[0007] Preferably, a protection circuit is also included, which includes a second voltage stabilizing diode Z2 and a first resistor R1, the output of the comparison circuit is connected to the anode of the second voltage stabilizing diode Z2, and the cathode of the second voltage stabilizing diode Z2 is connected to the second end of the fourth resistor R4 through the first resistor R1.

[0008] Preferably, a parasitic diode is connected in parallel between the source and the drain of the MOS tube.

[0009] Preferably, the circuit of the switch connector includes a second rectifier circuit to convert alternating current into direct current;

[0010] The voltage conversion circuit converts the rectified pulsating DC power into a regulated voltage and outputs a 3.3V voltage;

[0011] A zero-crossing detection circuit detects the zero-crossing point and sends the detected signal to the microcontroller U1;

[0012] The single chip microcomputer U1 receives the detection signal sent by the zero-crossing detection circuit. The signal output terminal of the single chip microcomputer U1 is connected to the thyristor drive circuit. The output of the thyristor drive circuit is connected to the control electrode of the thyristor Q2. The two main terminals (T1; T2) of the thyristor Q2 are respectively connected to the L1 terminal and N1 terminal of the intelligent zero-fire switch.

[0013] Preferably, an overheat protection circuit is also included, the overheat protection circuit includes a thermistor R3, two ends of the thermistor R3 are connected in parallel with a second capacitor C2, a first end of the thermistor R3 is grounded, a second end of the thermistor R3 is connected to a 3.3V power supply through a seventh resistor R7, and a second end of the thermistor R3 is connected to a signal input end of the single-chip computer U1.

[0014] Preferably, the first rectifier circuit and the second rectifier circuit are both bridge rectifier circuits.

[0015] Preferably, the voltage conversion circuit comprises a first voltage stabilizing diode Z1 and a first capacitor C1, the first output of the second rectifier circuit is connected to the anode of the first voltage stabilizing diode Z1, and the anode of the first voltage stabilizing diode Z1 is grounded;

[0016] The second output of the second rectifier circuit is respectively connected to the cathode of the first voltage zener diode Z1 through the eighth resistor R8, and the first capacitor C1 is connected in parallel between the anode and cathode of the first voltage zener diode Z1.

[0017] Preferably, the zero-crossing detection circuit includes a transistor Q5, the base of the transistor Q5 is connected to the second output end of the second rectifier circuit through a ninth resistor R9, the emitter of the transistor Q5 is grounded, and the collector of the transistor Q5 is connected to the signal input end of the microcontroller U1.

[0018] Preferably, the thyristor drive circuit comprises a first thyristor Q3, a second thyristor Q4, and a third diode D3, and the anode of the third diode D3 is connected to the single chip computer U1 through a second resistor R2;

[0019] The cathode of the third diode D3 is connected to the control electrodes of the first thyristor Q3 and the second thyristor Q4, the anode of the first thyristor Q3 is connected to the cathode of the second thyristor Q4, and the cathode of the first thyristor Q3 is connected to the anode of the second thyristor Q4;

[0020] The cathode of the second thyristor Q4 is connected to the control electrode of the thyristor Q2, and the anode of the second thyristor Q4 is connected to the T2 terminal of the thyristor Q2.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] 1. This application can realize the installation of zero-fire central control panel switches, scene panels, and PLC intelligent switches in single-fire wire situations.

[0023] 2. This application is compatible with various types of lamps, including tungsten filament lamps, LED lamps, energy-saving lamps, fluorescent lamps, and spotlights; single-channel resistive lamps are less than 200W, and LED lamps, energy-saving lamps, and fluorescent lamps are less than 100W.

[0024] 3. The working temperature of this application is -10~60℃.

[0025] 4. The flash eliminator is provided with a protection circuit to prevent the source and gate voltages of the MOS tube Q1 from being too high and the MOS tube Q1 from being burned out when the comparison circuit is not working.

[0026] 5. The switch connector has a built-in overheat protection unit with high temperature protection function. When the temperature is higher than the preset threshold upper limit, a signal is sent to the microcontroller, and the microcontroller controls the thyristor Q2 to automatically disconnect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the wiring diagram of a three-way zero-fire switch to a single-fire power supply;

[0028] Figure 2 The circuit diagram of the flash extinguisher for this application;

[0029] Figure 3 This is a circuit schematic diagram of the switch connector in Example 1 of the present application;

[0030] Figure 4 This is a circuit schematic diagram of the switch connector in Example 2 of the present application;

[0031] Figure 5 This is the wiring diagram for two three-way zero-fire switches to a single-fire power supply.

[0032] Figure numerals: 1 voltage conversion circuit, 2 zero-crossing detection circuit, 3 thyristor drive circuit. DETAILED DESCRIPTION

[0033] In order to enable technicians in this field to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Example 1

[0035] When using the product in this application, if Figure 1As shown, the wiring diagram of a three-way zero-fire intelligent switch to a single-fire power supply is taken as an example. The technology of this application is explained as follows: a zero-fire switch to a single-fire power supply, including a flash extinguisher and a switch connector. The flash extinguisher of this application is installed at both ends of the NL live wire of the lamp (load) without distinguishing the polarity. The lamp (load) installed with the flash extinguisher must be connected to the N line terminal of the intelligent zero-fire switch, and the switch connector is installed at both ends of the N-L1 of the intelligent zero-fire switch without distinguishing the polarity.

[0036] In order to avoid flickering when turning off the lights, this application uses modern micro-control electronic technology to achieve precise power extraction, without generating unnecessary power loss, interfering with the power grid, and affecting the service life of the lamp.

[0037] The flash suppressor of this application is connected to the zero and live wire power supply end of the lamp without distinguishing polarity. It adopts modern micro-control electronic technology to achieve accurate power supply, does not generate excess power loss, does not interfere with the power grid, and does not affect the service life of the lamp. The following are the performance parameters of the flash suppressor:

[0038] Working voltage: AC 100-250V, 50 / 60HZ;

[0039] Switch power consumption: less than 5W;

[0040] Lamp power: less than 200W (tungsten filament lamp); less than 100W (LED lamp / fluorescent lamp / energy-saving lamp).

[0041] like Figure 2 As shown, Figure 2 This is the wiring diagram for converting two three-way zero-fire switches to single-fire power supply. Connect the neutral line N end of the second three-way zero-fire switch to the neutral line N end of the first zero-fire switch.

[0042] Combined with Figure 3-4 , the flash extinguisher and switch connector in this application are further introduced.

[0043] like Figure 3 As shown, the internal circuit of the flash extinguisher includes a first rectifier circuit for converting AC power into DC power. The first rectifier circuit is a bridge rectifier circuit mainly composed of four diodes. The AC power is rectified by the first rectifier circuit to output DC power.

[0044] The output of the first rectifier circuit is connected to the drain of the MOS tube Q1, the gate of the MOS tube Q1 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected to the drain of the MOS tube Q1, a parasitic diode is connected in parallel between the drain and source of the MOS tube, the source of the MOS tube Q1 is grounded through the sixth resistor R6, and the source of the MOS tube Q1 is connected to the voltage detection circuit.

[0045] The output of the voltage detection circuit is connected to the input of the comparison circuit, and the output of the comparison circuit is connected to the gate of the MOS tube Q1; the comparison circuit receives the detection data sent by the voltage detection circuit, and outputs whether the MOS tube Q1 is turned on or not according to whether the detection data is within the set threshold range.

[0046] The output of the first rectifier circuit is grounded through the fifth resistor R5. The fifth resistor R5 is a varistor that plays an overvoltage protection role and prevents lightning strikes.

[0047] The on-state voltage of the MOS tube Q1 is 0-10V. When the MOS tube Q1 is turned on, it acts as a bypass.

[0048] Working principle of the flash extinguisher: When the light is turned on, the rectified 300V voltage is added to the pin 1 (gate) of the MOS tube Q1 through the fourth resistor R4, the MOS tube Q1 is turned on instantly, and the pin 2 (drain) and pin 3 (source) of the MOS tube Q1 are closed (the closing time of pin 2 and pin 3 of the MOS tube is short, about 1ms), and the voltage across the sixth resistor R6 instantly reaches 2.5V / 2.5A. After the voltage across the sixth resistor R6 reaches a certain value, the voltage detection circuit detects the voltage signal across the sixth resistor R6, and outputs the voltage detection signal value to the comparison signal input pin of the comparison circuit. After the comparison circuit processes the voltage detection signal value, the comparison circuit outputs a signal instantly, and the pin 1 (gate) of the MOS tube Q1 is short-circuited, which is equivalent to the pin 1 (gate) of the MOS tube Q1 being grounded. The MOS tube Q1 instantly disconnects pin 2 and pin 3 to prevent the MOS tube Q1 from burning out.

[0049] Principle of turning off the light: the current flowing into the MOS tube Q1 is small, the MOS tube Q1 is turned on, and the current flows through the sixth resistor R6. When the voltage flowing through the sixth resistor R6 does not exceed 2.5V, the voltage detection circuit and the comparison circuit will not work.

[0050] When the voltage of the sixth resistor R6 does not exceed 2.5V, the pin 1 of the MOS tube Q1 has a voltage and is turned on, and the pins 2 and 3 of the MOS tube Q1 are in a closed state.

[0051] When the voltage of the sixth resistor R6 exceeds 2.5V, the pin 2 and the pin 3 of the MOS tube Q1 are disconnected.

[0052] The lamp flash suppressor of the present application is also designed with a protection circuit, which can protect the MOS tube from being burned out when the light is turned on abnormally and the comparison circuit is not working.

[0053] Specifically, the protection circuit includes a second voltage zener diode Z2 and a first resistor R1, the output of the comparison circuit is connected to the anode of the second voltage zener diode Z2, and the cathode of the second voltage zener diode Z2 is connected to the second end of the fourth resistor R4 through the first resistor R1.

[0054] To prevent the MOS tube Q1 from being burned out when the comparison circuit is not working, the protection circuit is connected to the lamp, which can be understood as when the comparison circuit is not working, the anode of the second voltage stabilizing diode Z2 is electrically connected to the pin 1 of the MOS tube Q1.

[0055] The switch connector in this application is connected between N-L1 of the zero-ignition switch, and does not distinguish polarity. The following are the performance parameters of the switch connector:

[0056] Working voltage: AC 100-250V, 50 / 60HZ;

[0057] Lamp power: less than 200W (tungsten lamp); less than 100W (LED lamp / fluorescent lamp / energy-saving lamp). Figure 4 As shown, the circuit of the switch connector includes a single chip computer U1, a thyristor Q2, a second rectifier circuit, a voltage conversion circuit, and a second rectifier circuit that converts AC power into DC power at zero crossing, and the second rectifier circuit is a bridge rectifier circuit.

[0058] Two input terminals of the second rectifier circuit are connected to the L1 terminal of the neutral switch and the neutral line terminal, and the output of the second rectifier circuit is connected to the voltage conversion circuit 1.

[0059] The voltage conversion circuit 1 performs voltage stabilization conversion on the rectified pulsating direct current and outputs a 3.3V voltage.

[0060] The zero-crossing detection circuit 2 detects the zero-crossing point and sends the detected signal to the single-chip microcomputer U1.

[0061] The single chip microcomputer U1 receives the detection signal sent by the zero-crossing detection circuit 2. The signal output terminal of the single chip microcomputer U1 is connected to the thyristor drive circuit 3. The output of the thyristor drive circuit 3 is connected to the control electrode of the thyristor Q2. The two main terminals (T1; T2) of the thyristor Q2 are respectively connected to the L1 terminal and N1 terminal of the intelligent zero-fire switch.

[0062] The function of the zero-crossing detection circuit 2 is to delay conduction (3ms). After the zero-crossing detection circuit 2 detects the zero-crossing point, it sends it to the microcontroller U1. Within the delay range, the microcontroller U1 gives a pulsating DC signal to the thyristor Q2, causing the thyristor Q2 to conduct.

[0063] In a preferred embodiment, the switch connector also includes an overheat protection circuit, which includes a thermistor R3, two ends of the thermistor R3 are connected in parallel with a second capacitor C2, a first end of the thermistor R3 is grounded, a second end of the thermistor R3 is connected to a 3.3V power supply through a first resistor R1, and a second end of the thermistor R3 is connected to a signal input end of the microcontroller U1.

[0064] When the thyristor Q2 generates heat during operation and the thermistor R3 detects that the temperature is higher than the preset threshold upper limit, the application is sent to the microcontroller. When in use, the flash extinguisher is installed at both ends of the NL live wire of the lamp (load) without distinguishing the polarity. The lamp (load) installed with the flash extinguisher must be connected to the N line terminal of the intelligent zero-fire switch, and the switch connector is installed at both ends of the intelligent zero-fire switch N-L1 without distinguishing the polarity.

[0065] Example 2

[0066] The technical solution of Example 2 is basically the same as that of Example 1, except that: Figure 5 As shown, the voltage conversion circuit 1 in this embodiment includes a first voltage stabilizing diode Z1, a first capacitor C1, a first output of the second rectifier circuit connected to the positive electrode of the first voltage stabilizing diode Z1, and the positive electrode of the first voltage stabilizing diode Z1 is grounded; the second output of the second rectifier circuit is connected to the negative electrode of the first voltage stabilizing diode Z1 through an eighth resistor R8; the first capacitor CI is connected in parallel between the positive and negative electrodes of the first voltage stabilizing diode Z1. The voltage conversion circuit performs voltage stabilization conversion on the rectified pulsating DC power and outputs a 3.3V voltage.

[0067] The zero-crossing detection circuit 2 includes a transistor Q5, the base of which is connected to the second output end of the second rectifier circuit through a ninth resistor, the emitter of which is grounded, and the collector of which is connected to the signal input end of the microcontroller U1. The zero-crossing detection circuit 2 detects the zero-crossing point and sends the detected signal to the microcontroller U1.

[0068] The single-chip microcomputer U1 sends and receives signals. The input end of the single-chip microcomputer U1 is connected to the zero-crossing signal output of the zero-crossing detection circuit 2. The signal output end of the single-chip microcomputer U1 is connected to the thyristor drive circuit 3. The output of the thyristor drive circuit 3 is connected to the thyristor Q2. The function of the zero-crossing detection circuit 2 is to delay conduction (3ms). After the zero-crossing detection circuit 2 detects the zero-crossing point, it sends it to the single-chip microcomputer U1. Within the delay range, the single-chip microcomputer U1 sends a pulsating DC signal to the thyristor Q2, which turns on the thyristor Q2.

[0069] The thyristor drive circuit 3 includes a first thyristor Q3, a second thyristor Q4, and a third diode D3. The anode of the third diode D3 is connected to the single-chip computer U1 through a second resistor R2; the cathode of the third diode D3 is connected to the control electrode of the second thyristor Q4, the cathode of the second thyristor Q4 is connected to the control electrode of the thyristor Q2, and the anode of the second thyristor Q4 is connected to the T2 terminal of the thyristor Q2; the cathode of the third diode D3 is connected to the control electrode of the first thyristor Q3, the anode of the first thyristor Q3 is connected to the cathode of the second thyristor Q4, and the cathode of the first thyristor Q3 is connected to the anode of the second thyristor Q4.

[0070] The single-chip computer U1 receives the detection signal sent by the zero-crossing detection circuit 2. The signal output terminal of the single-chip computer U1 is connected to the thyristor drive circuit 3. The output of the thyristor drive circuit is connected to the control electrode of the thyristor Q2. The two main terminals (T1; T2) of the thyristor are respectively connected to the L1 terminal and the N1 terminal of the intelligent zero-fire switch. The single-chip computer U1 controls the thyristor Q2 to supply power to the zero-fire switch.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A zero-fire switch to single-live power supply, including a flash extinguisher and a switch connector, wherein the flash extinguisher is installed at both ends of the NL live wire of the lamp load without distinguishing polarity, the load installed with the flash extinguisher is connected to the N line terminal of the intelligent zero-fire switch, and the switch connector is installed at both ends of the N-L1 of the intelligent zero-fire switch without distinguishing polarity, characterized in that: The circuit of the flash extinguisher includes a first rectifier circuit for converting AC power into DC power, the output of the first rectifier circuit is connected to the drain of the MOS tube Q1, the gate of the MOS tube Q1 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected to the drain of the MOS tube Q1, the source of the MOS tube Q1 is grounded through the sixth resistor R6, and the source of the MOS tube Q1 is connected to the voltage detection circuit; the output of the voltage detection circuit is connected to the input of the comparison circuit, and the output of the comparison circuit is connected to the gate of the MOS tube Q1; the voltage detection circuit detects the voltage on the sixth resistor R6, and outputs the detected data to the comparison circuit; The comparison circuit receives the detection data sent by the voltage detection circuit, and outputs whether the MOS tube Q1 is turned on or not according to whether the detection data is within a set threshold range.

2. The zero-fire switch to single-fire wire power supply according to claim 1, characterized in that: It also includes a protection circuit, which includes a second voltage-stabilizing diode Z2 and a first resistor R1. The output of the comparison circuit is connected to the anode of the second voltage-stabilizing diode Z2, and the cathode of the second voltage-stabilizing diode Z2 is connected to the second end of the fourth resistor R4 through the first resistor R1.

3. The zero-fire switch to single-fire wire power supply according to claim 1, characterized in that: A parasitic diode is connected in parallel between the source and drain of the MOS tube.

4. The zero-fire switch to single-fire wire power supply according to any one of claims 1-3, characterized in that: The circuit of the switch connector includes a second rectifier circuit to convert AC power into DC power; The voltage conversion circuit converts the rectified pulsating DC power into a regulated voltage and outputs a 3.3V voltage; A zero-crossing detection circuit detects the zero-crossing point and sends the detected signal to the microcontroller U1; The single chip microcomputer U1 receives the detection signal sent by the zero-crossing detection circuit. The signal output terminal of the single chip microcomputer U1 is connected to the thyristor drive circuit. The output of the thyristor drive circuit is connected to the control electrode of the thyristor Q2. The two main terminals (T1; T2) of the thyristor Q2 are respectively connected to the L1 terminal and N1 terminal of the intelligent zero-fire switch.

5. The zero-fire switch to single-fire wire power supply according to claim 4, characterized in that: It also includes an overheat protection circuit, which includes a thermistor R3, two ends of the thermistor R3 are connected in parallel with a second capacitor C2, a first end of the thermistor R3 is grounded, a second end of the thermistor R3 is connected to a 3.3V power supply through a seventh resistor R7, and a second end of the thermistor R3 is connected to a signal input end of the single-chip computer U1.

6. The zero-fire switch to single-fire wire power supply according to claim 4, characterized in that: The first rectifier circuit and the second rectifier circuit are both bridge rectifier circuits.

7. The zero-fire switch to single-fire wire power supply according to claim 4, characterized in that: The voltage conversion circuit includes a first voltage stabilizing diode Z1 and a first capacitor C1. The first output of the second rectifier circuit is connected to the positive electrode of the first voltage stabilizing diode Z1, and the positive electrode of the first voltage stabilizing diode Z1 is grounded. The second output of the second rectifier circuit is connected to the cathode of the first voltage zener diode Z1 through the eighth resistor R8, and the first capacitor C1 is connected in parallel between the positive and negative electrodes of the first voltage zener diode Z1.

8. The zero-fire switch to single-fire wire power supply according to claim 4, characterized in that: The zero-crossing detection circuit includes a transistor Q5, the base of which is connected to the second output end of the second rectifier circuit through a ninth resistor R9, the emitter of which is grounded, and the collector of which is connected to the signal input end of the microcontroller U1.

9. The zero-fire switch to single-fire wire power supply according to claim 4, characterized in that: The thyristor drive circuit includes a first thyristor Q3, a second thyristor Q4, and a third diode D3, wherein the anode of the third diode D3 is connected to the single chip computer U1 through a second resistor R2; The cathode of the third diode D3 is connected to the control electrodes of the first thyristor Q3 and the second thyristor Q4, the anode of the first thyristor Q3 is connected to the cathode of the second thyristor Q4, and the cathode of the first thyristor Q3 is connected to the anode of the second thyristor Q4; The cathode of the second thyristor Q4 is connected to the control electrode of the thyristor Q2, and the anode of the second thyristor Q4 is connected to the T2 terminal of the thyristor Q2.

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