Circuit structure for realizing zero-voltage pull-in of relay

Abstract

The utility model relates to a kind of circuit structure for realizing relay zero-voltage attraction, including power module, relay control module, first zero-voltage detection module, second zero-voltage detection module and controller, power module, first zero-voltage detection module and second zero-voltage detection module are connected with neutral line, power module, relay control module and first zero-voltage detection module are connected with live wire, controller is connected with first zero-voltage detection module, second zero-voltage detection module and relay control module, power module is connected with relay control module, first zero-voltage detection module, second zero-voltage detection module and controller and power supply. The circuit structure for realizing relay zero-voltage attraction using the utility model can solve the problem of relay zero-point attraction on the basis of less manpower and material cost, greatly improve the load capacity including power and quantity, can detect and calculate the life of product, and the cost of the circuit is low.

Description

Technical Field

[0001] This utility model relates to the field of industrial control, and more particularly to the field of relay control switching technology, specifically a circuit structure for achieving zero-voltage activation of a relay. Background Technology

[0002] Since most existing lighting fixtures are LEDs, existing relay modules typically use high-power, surge-resistant relays or relays that engage at zero voltage to accommodate the high starting current of LED lights. Common methods for relay zero-point engagement include simple zero-voltage engagement with a fixed delay, and methods with feedback to adjust the delay time. Simple zero-point engagement with a fixed delay time cannot achieve batch consistency due to differences in relay engagement time, various components, and voltage variations. It requires testing and correction during production, which consumes manpower and resources and increases costs. The feedback method is inconvenient for AC power testing and can only use a successive approximation method to make the engagement of batch products approach zero point. The error may be ±2ms, and the use of optocoupler detection is generally costly. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a circuit structure that achieves zero-voltage activation of a relay, which is low in cost, has high load capacity, and is widely applicable.

[0004] To achieve the above objectives, the circuit structure for zero-voltage relay activation in this invention is as follows: The circuit structure for achieving zero-voltage relay engagement is characterized by comprising a power supply module, a relay control module, a first zero-voltage detection module, a second zero-voltage detection module, and a controller. The power supply module, the first zero-voltage detection module, and the second zero-voltage detection module are all connected to the neutral wire. The power supply module, the relay control module, and the first zero-voltage detection module are all connected to the live wire. The controller is connected to the first zero-voltage detection module, the second zero-voltage detection module, and the relay control module. The power supply module is connected to and supplies power to the relay control module, the first zero-voltage detection module, the second zero-voltage detection module, and the controller.

[0005] Preferably, the power module includes a first diode D1, a second diode D2, a first polarized capacitor CE1, a first inductor L1, a second polarized capacitor CE2, a twelfth resistor R12, a second microcontroller U2, a fourteenth resistor R14, a third capacitor C3, a third diode D3, a fourth diode D4, a second inductor L2, a third polarized capacitor CE3, a fourth polarized capacitor CE4, a thirteenth resistor R13, and a fourth capacitor C4. The cathode of the first diode D1 is connected to the anode of the second diode D2. One end of the first inductor L1 is connected to the negative terminal of the second diode D2, and the other end of the first inductor L1 is connected to the DRAIN pin of the second microcontroller U2. The twelfth resistor R12 is connected across the first inductor L1. The positive terminal of the first polarized capacitor CE1 is connected to the negative terminal of the second diode D2, and the negative terminal of the first polarized capacitor CE1 is connected to the neutral wire. The positive terminal of the second polarized capacitor CE2 is connected to the DRAIN pin of the second microcontroller U2, and the negative terminal of the second polarized capacitor CE2 is connected to the neutral wire. One end of the fourteenth resistor R14 is connected to the chip select pin of the second microcontroller U2, and the other end of the fourteenth resistor R14 is connected to the GND pin of the second microcontroller U2. One end of the third capacitor C3 is connected to the VCC pin of the second microcontroller U2, and the other end of the third capacitor C3 is connected to the feedback pin of the second microcontroller U2. The cathode of the third diode D3 is connected to the VCC pin of the second microcontroller U2, and the cathode of the fourth diode D4 is connected to the GND pin of the second microcontroller U2. Connect the positive terminal of the fourth diode D4 to the neutral wire. Connect one end of the second inductor L2 to the GND pin of the second microcontroller U2, and connect the other end of the second inductor L2 to a 5V power supply. Connect the positive terminals of the third diode D3 and the third polarized capacitor CE3 to a 5V power supply, connect the negative terminal of the third polarized capacitor CE3 to the neutral wire, connect the negative terminal of the fourth polarized capacitor CE4 to the neutral wire, connect one end of the thirteenth resistor R13 to a 5V power supply and the other end to ground, and connect one end of the fourth capacitor C4 to a 5V power supply and the other end to ground.

[0006] Preferably, the controller includes a first decoupling capacitor C1, a seventh resistor R7, a second decoupling capacitor C2, a first microcontroller U1, an input button SW1, a fourth button pull-up resistor R4, a first LED, and a first current-limiting resistor R1. The first decoupling capacitor C1 and the seventh resistor R7 are connected together, with the other end of the seventh resistor R7 connected to a 5V power supply. The other end of the first decoupling capacitor C1 is grounded. The midpoint between the first decoupling capacitor C1 and the seventh resistor R7 is connected to the NRST pin of the first microcontroller U1. One end of the second decoupling capacitor C2 is connected to the VCAP pin of the first microcontroller U1, and the other end is grounded. One end of the input button SW1 is connected to the fourth button pull-up resistor R4 and to the KEY pin of the first microcontroller U1, with the other end of the input button SW1 grounded. The other end of the fourth button pull-up resistor R4 is connected to a 5V power supply. The first LED and the first current-limiting resistor R1 are connected together, with the other end of the first current-limiting resistor R1 connected to the LED pin of the first microcontroller U1, and the other end of the first LED is grounded.

[0007] Preferably, the first zero-voltage detection module includes a ninth current-limiting resistor R9, a tenth current-limiting resistor R10, and an eleventh voltage divider pull-down resistor R11. The ninth current-limiting resistor R9 and the tenth current-limiting resistor R10 are connected together. The other end of the ninth current-limiting resistor R9 is connected to the negative terminal of the first diode D1. The other end of the tenth current-limiting resistor R10 is connected to the SYNC pin of the first microcontroller U1 of the controller. One end of the eleventh voltage divider pull-down resistor R11 is connected to the SYNC pin of the first microcontroller U1 of the controller, and the other end is grounded.

[0008] Preferably, the second zero-voltage detection module includes a fifth current-limiting resistor R5, a sixth current-limiting resistor R6, and an eighth pull-down resistor R8. The fifth current-limiting resistor R5 and the sixth current-limiting resistor R6 are connected together. The other end of the fifth current-limiting resistor R5 is connected to the live wire of the load. The other end of the sixth current-limiting resistor R6 is connected to the L1SYNC pin of the first microcontroller U1 of the controller. One end of the eighth pull-down resistor R8 is connected to the L1SYNC pin of the first microcontroller U1 of the controller, and the other end is grounded. The eighth pull-down resistor R8, the fifth current-limiting resistor R5, and the sixth current-limiting resistor R6 form a voltage divider circuit.

[0009] Preferably, the relay control module includes a relay K1, a power-off reverse protection diode D5, a second current-limiting resistor R2, a third pull-down resistor R3, and a switching transistor Q1. The power-off reverse protection diode D5 is connected across the two ends of the relay K1. The collector of the switching transistor Q1 is connected to the relay K1, the base of the switching transistor Q1 is connected to the second current-limiting resistor R2, and the emitter of the switching transistor Q1 is grounded. One end of the third pull-down resistor R3 is connected to the base of the switching transistor Q1, and the other end of the third pull-down resistor R3 is grounded. The relay K1 is also connected to the terminal block of the load live wire.

[0010] The circuit structure of this invention, which enables zero-voltage relay engagement, can solve the problem of relay zero-point engagement with less manpower and material costs. It better addresses the current issue of high surge current in LED loads leading to short product lifespan, significantly improving load capacity, including power and quantity. It can also detect and calculate product lifespan, and the circuit is low in cost. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the circuit structure for achieving zero-voltage activation of the relay according to this utility model.

[0012] Figure 2 This is a schematic diagram of the power supply module and the first zero-voltage detection module, which are part of the circuit structure for realizing zero-voltage relay activation according to this utility model.

[0013] Figure 3 This is a schematic diagram of the controller for realizing the circuit structure of the relay zero-voltage activation according to this utility model.

[0014] Figure 4 This is a schematic diagram of the second zero-voltage detection module of the circuit structure for realizing zero-voltage relay activation according to this utility model.

[0015] Figure 5 This is a schematic diagram of the relay control module of this utility model, which realizes the circuit structure of the relay for zero-voltage activation.

[0016] Figure 6 This is a schematic diagram illustrating the working process of the circuit structure of this utility model that enables the relay to engage at zero voltage. Detailed Implementation

[0017] To more clearly describe the technical content of this utility model, the following description is provided in conjunction with specific embodiments.

[0018] The circuit structure for achieving zero-voltage relay engagement according to this utility model includes a power supply module, a relay control module, a first zero-voltage detection module, a second zero-voltage detection module, and a controller. The power supply module, the first zero-voltage detection module, and the second zero-voltage detection module are all connected to the neutral wire. The power supply module, the relay control module, and the first zero-voltage detection module are all connected to the live wire. The controller is connected to the first zero-voltage detection module, the second zero-voltage detection module, and the relay control module. The power supply module is connected to and supplies power to the relay control module, the first zero-voltage detection module, the second zero-voltage detection module, and the controller.

[0019] In a preferred embodiment of this utility model, the power supply module includes a first diode D1, a second diode D2, a first polarized capacitor CE1, a first inductor L1, a second polarized capacitor CE2, a twelfth resistor R12, a second microcontroller U2, a fourteenth resistor R14, a third capacitor C3, a third diode D3, a fourth diode D4, a second inductor L2, a third polarized capacitor CE3, a fourth polarized capacitor CE4, a thirteenth resistor R13, and a fourth capacitor C4. The cathode of the first diode D1 is connected to the anode of the second diode D2. The first inductor L1 is connected to the cathode of the second diode D2, and the other end of the first inductor L1 is connected to the DRAIN pin of the second microcontroller U2. The twelfth resistor R12 is connected across the first inductor L1. The anode of the first polarized capacitor CE1 is connected to the cathode of the second diode D2, and the cathode of the first polarized capacitor CE1 is connected to the neutral wire. The anode of the second polarized capacitor CE2 is connected to the DRAIN pin of the second microcontroller U2, and the cathode of the second polarized capacitor CE2 is connected to the neutral wire. The fourteenth resistor R14 is connected to the chip select pin of the second microcontroller U2, and the other end of the fourteenth resistor R14 is connected to the GND pin of the second microcontroller U2. One end of the third capacitor C3 is connected to the VCC pin of the second microcontroller U2, and the other end of the third capacitor C3 is connected to the feedback pin of the second microcontroller U2. The cathode of the third diode D3 is connected to the VCC pin of the second microcontroller U2, and the cathode of the fourth diode D4 is connected to the GND pin of the second microcontroller U2. The circuit is as follows: the positive terminal of the fourth diode D4 is connected to the neutral wire; one end of the second inductor L2 is connected to the GND pin of the second microcontroller U2; the other end of the second inductor L2 is connected to a 5V power supply; the positive terminals of the third diode D3 and the third polarized capacitor CE3 are both connected to a 5V power supply; the negative terminal of the third polarized capacitor CE3 is connected to the neutral wire; the negative terminal of the fourth polarized capacitor CE4 is connected to the neutral wire; one end of the thirteenth resistor R13 is connected to a 5V power supply, and the other end is grounded; one end of the fourth capacitor C4 is connected to a 5V power supply, and the other end is grounded.

[0020] In a preferred embodiment of this utility model, the controller includes a first decoupling capacitor C1, a seventh resistor R7, a second decoupling capacitor C2, a first microcontroller U1, an input button SW1, a fourth button pull-up resistor R4, a first LED, and a first current-limiting resistor R1. The first decoupling capacitor C1 and the seventh resistor R7 are connected together, with the other end of the seventh resistor R7 connected to a 5V power supply. The other end of the first decoupling capacitor C1 is grounded. The midpoint between the first decoupling capacitor C1 and the seventh resistor R7 is connected to the NRST pin of the first microcontroller U1. One end of the second decoupling capacitor C2 is connected to the VCAP pin of the first microcontroller U1, and the other end is grounded. One end of the input button SW1 is connected to the fourth button pull-up resistor R4 and to the KEY pin of the first microcontroller U1, with the other end of the input button SW1 grounded. The other end of the fourth button pull-up resistor R4 is connected to a 5V power supply. The first LED and the first current-limiting resistor R1 are connected together, with the other end of the first current-limiting resistor R1 connected to the LED pin of the first microcontroller U1, and the other end of the first LED grounded.

[0021] In a preferred embodiment of this utility model, the first zero-voltage detection module includes a ninth current-limiting resistor R9, a tenth current-limiting resistor R10, and an eleventh voltage divider pull-down resistor R11. The ninth current-limiting resistor R9 and the tenth current-limiting resistor R10 are connected together. The other end of the ninth current-limiting resistor R9 is connected to the negative terminal of the first diode D1. The other end of the tenth current-limiting resistor R10 is connected to the SYNC pin of the first microcontroller U1 of the controller. One end of the eleventh voltage divider pull-down resistor R11 is connected to the SYNC pin of the first microcontroller U1 of the controller, and the other end is grounded.

[0022] In a preferred embodiment of this utility model, the second zero-voltage detection module includes a fifth current-limiting resistor R5, a sixth current-limiting resistor R6, and an eighth pull-down resistor R8. The fifth current-limiting resistor R5 and the sixth current-limiting resistor R6 are connected together. The other end of the fifth current-limiting resistor R5 is connected to the live wire of the load. The other end of the sixth current-limiting resistor R6 is connected to the L1 SYNC pin of the first microcontroller U1 of the controller. One end of the eighth pull-down resistor R8 is connected to the L1 SYNC pin of the first microcontroller U1 of the controller, and the other end is grounded. The eighth pull-down resistor R8, the fifth current-limiting resistor R5, and the sixth current-limiting resistor R6 form a voltage divider circuit.

[0023] In a preferred embodiment of this utility model, the relay control module includes a relay K1, a power-off reverse protection diode D5, a second current-limiting resistor R2, a third pull-down resistor R3, and a switching transistor Q1. The power-off reverse protection diode D5 is connected across the two ends of the relay K1. The collector of the switching transistor Q1 is connected to the relay K1, the base of the switching transistor Q1 is connected to the second current-limiting resistor R2, and the emitter of the switching transistor Q1 is grounded. One end of the third pull-down resistor R3 is connected to the base of the switching transistor Q1, and the other end of the third pull-down resistor R3 is grounded. The relay K1 is also connected to the terminal block of the load live wire.

[0024] In specific embodiments of this utility model, such as Figure 1 As shown, this solution consists of a power supply, a relay control module, a first zero-voltage detection module, a second zero-voltage detection module, and a controller. The power supply provides power to each component. The relay control module drives the relays and handles their input and output. The first zero-voltage detection module detects the AC power waveform and extracts the zero-voltage point. The second zero-voltage detection module detects the voltage waveform of the relay output voltage. The controller analyzes the waveforms from both modules and uses an algorithm to control the relay control module, causing the relay to engage at the zero-voltage point of the AC power supply, reducing the starting current. It also detects the working state of the relay contacts and calculates the relay's lifespan, thereby significantly increasing the product's load-carrying capacity and indicating to the user whether the product has reached the end of its lifespan.

[0025] In this invention, LL refers to the live wire after the fuse resistor.

[0026] like Figure 2 As shown, this utility model provides a relay actuator with zero-voltage engagement and product life indication, including U1, U2, R1~R13, LED1, SW1, D1~D4, C1~C4, Q1, K1, CN1~CN3, CE1~CE4, L1 and L2; D1, D2, CE1, L1, CE2, R12, U2, R14, C3, D3, D4, L2, CE3, CE4, R13, and C4 form a non-isolated switching power supply with N-line common ground, which supplies power to the circuit structure and provides a ground plane for detecting zero-crossing voltage and pull-in signals. R9, R10, and R11 are used by the first zero-voltage detection module to detect the AC voltage zero point. R9 and R10 are current-limiting resistors, and R11 is a voltage divider and pull-down resistor. R5, R6, and R8 form the second zero-voltage detection module, which detects the AC voltage zero point of the load line. When the load is powered (i.e., when the relay is energized), the line outputs a waveform. When the load is not powered (i.e., when the relay is de-energized), the line outputs no waveform. R5 and R6 are current-limiting resistors, and R8 is a pull-down resistor. Together with R5 and R6, they form a voltage divider circuit.

[0027] C1, R7, C2, U1, SW1, R4, LED1, and R1 form the controller, which is the signal input detection and algorithm control module. It controls the activation and deactivation of the relay and provides a signal to indicate whether the product has reached the end of its lifespan. C1 and C2 are decoupling capacitors, R4 is a button pull-up resistor, SW1 is an input button, LED1 is an indicator LED that indicates the output status of the relay and the circuit structure status, R1 is a current limiting resistor, and U1 is a microcontroller.

[0028] K1, D5, R2, R3, and Q1 are relay control modules, controlled by the control module. K1 is a relay, D5 is a relay coil de-energization backflush protection diode, R2 is a current-limiting resistor, R3 is a pull-down resistor, and Q1 is a switching transistor that controls the on / off state of the relay coil current.

[0029] CN1, CN2, and CN3 are terminals for connecting the live wire, load live wire, and neutral wire.

[0030] The working principle of this utility model is as follows: U1 obtains the AC zero-point and the load AC zero-point waveform by detecting the waveforms of the first and second zero-voltage detection modules. Comparing the two zero-point waveforms determines whether the relay is energized at the zero point. If it is not at the zero point, then... Figure 6 The steps shown adjust the timing of the pull-in control, ultimately causing the relay to pull in at the zero voltage point.

[0031] For the specific implementation scheme of this embodiment, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0032] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0033] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means at least two.

[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] The circuit structure of this invention, which enables zero-voltage relay engagement, can solve the problem of relay zero-point engagement with less manpower and material costs. It better addresses the current issue of high surge current in LED loads leading to short product lifespan, significantly improving load capacity, including power and quantity. It can also detect and calculate product lifespan, and the circuit is low in cost.

[0036] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be considered illustrative rather than restrictive.

Claims

1. A circuit structure for achieving zero-voltage activation of a relay, characterized in that, The circuit structure includes a power supply module, a relay control module, a first zero-voltage detection module, a second zero-voltage detection module, and a controller. The power supply module, the first zero-voltage detection module, and the second zero-voltage detection module are all connected to the neutral wire. The power supply module, the relay control module, and the first zero-voltage detection module are all connected to the live wire. The controller is connected to the first zero-voltage detection module, the second zero-voltage detection module, and the relay control module. The power supply module is connected to and supplies power to the relay control module, the first zero-voltage detection module, the second zero-voltage detection module, and the controller. The first zero-voltage detection module includes a ninth current-limiting resistor R9, a tenth current-limiting resistor R10, and an eleventh voltage divider pull-down resistor R11. The ninth current-limiting resistor R9 and the tenth current-limiting resistor R10 are connected together. The other end of the ninth current-limiting resistor R9 is connected to the negative terminal of the first diode D1. The other end of the tenth current-limiting resistor R10 is connected to the SYNC pin of the first microcontroller U1 of the controller. One end of the eleventh voltage divider pull-down resistor R11 is connected to the SYNC pin of the first microcontroller U1 of the controller, and the other end is grounded. The second zero-voltage detection module includes a fifth current-limiting resistor R5, a sixth current-limiting resistor R6, and an eighth pull-down resistor R8. The fifth current-limiting resistor R5 and the sixth current-limiting resistor R6 are connected together. The other end of the fifth current-limiting resistor R5 is connected to the live wire of the load. The other end of the sixth current-limiting resistor R6 is connected to the L1 SYNC pin of the first microcontroller U1 of the controller. One end of the eighth pull-down resistor R8 is connected to the L1 SYNC pin of the first microcontroller U1 of the controller, and the other end is grounded. The eighth pull-down resistor R8, the fifth current-limiting resistor R5, and the sixth current-limiting resistor R6 form a voltage divider circuit.

2. The circuit structure for achieving zero-voltage relay activation according to claim 1, characterized in that, The power module includes a first diode D1, a second diode D2, a first polarized capacitor CE1, a first inductor L1, a second polarized capacitor CE2, a twelfth resistor R12, a second microcontroller U2, a fourteenth resistor R14, a third capacitor C3, a third diode D3, a fourth diode D4, a second inductor L2, a third polarized capacitor CE3, a fourth polarized capacitor CE4, a thirteenth resistor R13, and a fourth capacitor C4. The cathode of the first diode D1 is connected to the anode of the second diode D2. One end of the first inductor L1 is connected to the negative terminal of the second diode D2, and the other end of the first inductor L1 is connected to the DRAIN pin of the second microcontroller U2. The twelfth resistor R12 is connected across the first inductor L1. The positive terminal of the first polarized capacitor CE1 is connected to the negative terminal of the second diode D2, and the negative terminal of the first polarized capacitor CE1 is connected to the neutral wire. The positive terminal of the second polarized capacitor CE2 is connected to the DRAIN pin of the second microcontroller U2, and the negative terminal of the second polarized capacitor CE2 is connected to the neutral wire. One end of the fourteenth resistor R14 is connected to the chip select pin of the second microcontroller U2, and the other end of the fourteenth resistor R14 is connected to the GND pin of the second microcontroller U2. One end of the third capacitor C3 is connected to the VCC pin of the second microcontroller U2, and the other end of the third capacitor C3 is connected to the feedback pin of the second microcontroller U2. The cathode of the third diode D3 is connected to the VCC pin of the second microcontroller U2, and the cathode of the fourth diode D4 is connected to the GND pin of the second microcontroller U2. The positive terminal of the fourth diode D4 is connected to the neutral wire. One end of the second inductor L2 is connected to the GND pin of the second microcontroller U2, and the other end of the second inductor L2 is connected to a 5V power supply. The positive terminals of the third diode D3 and the third polarized capacitor CE3 are both connected to a 5V power supply, and the negative terminal of the third polarized capacitor CE3 is connected to the neutral wire. The negative terminal of the fourth polarized capacitor CE4 is connected to the neutral wire. One end of the thirteenth resistor R13 is connected to a 5V power supply, and the other end is grounded. One end of the fourth capacitor C4 is connected to a 5V power supply, and the other end is grounded.

3. The circuit structure for achieving zero-voltage relay activation according to claim 1, characterized in that, The controller includes a first decoupling capacitor C1, a seventh resistor R7, a second decoupling capacitor C2, a first microcontroller U1, an input button SW1, a fourth button pull-up resistor R4, a first LED, and a first current-limiting resistor R1. The first decoupling capacitor C1 and the seventh resistor R7 are connected together, with the other end of the seventh resistor R7 connected to a 5V power supply. The other end of the first decoupling capacitor C1 is grounded. The midpoint between the first decoupling capacitor C1 and the seventh resistor R7 is connected to the NRST pin of the first microcontroller U1. One end of the second decoupling capacitor C2 is connected to the VCAP pin of the first microcontroller U1, and the other end is grounded. One end of the input button SW1 is connected to the fourth button pull-up resistor R4 and to the KEY pin of the first microcontroller U1, with the other end of the input button SW1 grounded. The other end of the fourth button pull-up resistor R4 is connected to a 5V power supply. The first LED and the first current-limiting resistor R1 are connected together, with the other end of the first current-limiting resistor R1 connected to the LED pin of the first microcontroller U1, and the other end of the first LED is grounded.

4. The circuit structure for achieving zero-voltage relay activation according to claim 1, characterized in that, The relay control module includes a relay K1, a power-off reverse protection diode D5, a second current-limiting resistor R2, a third pull-down resistor R3, and a switching transistor Q1. The power-off reverse protection diode D5 is connected across the two ends of the relay K1. The collector of the switching transistor Q1 is connected to the relay K1, the base of the switching transistor Q1 is connected to the second current-limiting resistor R2, and the emitter of the switching transistor Q1 is grounded. One end of the third pull-down resistor R3 is connected to the base of the switching transistor Q1, and the other end of the third pull-down resistor R3 is grounded. The relay K1 is also connected to the terminal block of the load live wire.

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