Relay zero point switch closing control system

Abstract

The utility model discloses a relay zero point switch closing control system, comprising a power supply module used for converting an alternating current of an input power supply into a direct current; the zero point detection circuit is used for detecting the zero crossing point of the alternating current input signal, and the zero point detection circuit comprises a zero point input detection unit and a zero point output detection unit and is configured to detect the voltage zero crossing point of the alternating current signal on the live wire; and the micro-control unit is electrically connected with the power supply module and the zero point detection circuit. According to the utility model, through accurate zero point detection and control, the relay is only opened and closed at the zero point, thereby preventing relay contact damage caused by electric arc, obviously prolonging the service life of the relay, reducing the frequency of maintenance and replacement, effectively solving the problems of oxidation and adhesion of the relay contact, and improving the reliability of the relay. The system can provide more reliable switch control in high-power equipment, and ensures the stability and safety of the equipment in a high-load operation environment.

Description

Technical Field

[0001] The utility model relates to a control circuit, in particular to a relay zero point switch closing control system. Background Art

[0002] With the widespread use of smart homes, industrial control, and other high-power electrical devices, relays, as switching control elements in electrical equipment, play the important role of controlling the on / off state of circuits. However, in existing technologies, relay opening and closing operations often occur at any time during the AC current flow. This is especially true when closing or opening a relay in a non-zero state, when the current is at its peak, which can easily generate arcs. These arcs not only accelerate the wear of relay contacts, leading to contact oxidation and adhesion, but also adversely affect the normal operation of electrical equipment, and may even cause equipment damage.

[0003] To overcome these issues, some existing technologies incorporate zero-crossing detection circuits to control relays when the AC current crosses zero, effectively reducing arcing. However, most of these existing technologies suffer from the following shortcomings: First, the accuracy and response speed of the zero-crossing detection circuits are insufficient, resulting in delayed relay switching, which may still open and close at non-zero points. Second, existing control methods cannot be adjusted to actual application environments, prone to inaccurate control behavior under varying load conditions. Furthermore, the control systems of existing technologies are complex and costly, making them unsuitable for large-scale applications. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a relay zero-point switch closing control system, which can ensure that the relay opens and closes at the zero point of the alternating current through precise zero-point detection and control methods, thereby reducing the generation of arcs and extending the service life of the relay. The system should have the characteristics of simple structure, rapid response and low cost, and is suitable for multiple fields such as smart home and industrial automation.

[0005] The utility model is realized by the following technical solutions: a relay zero point switch closing control system, comprising:

[0006] a power module, configured to convert AC power of an input power source into DC power;

[0007] a zero point detection circuit for detecting a zero-crossing point of an AC input signal, wherein the zero point detection circuit comprises a zero-point input detection unit and a zero-point output detection unit, and is configured to detect a voltage zero-crossing point of the AC signal on the live line;

[0008] a microcontroller unit electrically connected to the power module and the zero-point detection circuit, the MCU receiving a zero-point signal from the zero-point detection circuit and adjusting a time delay of a relay control signal based on a detected zero-crossing point of the AC signal;

[0009] a relay module connected to the MCU and performing opening and closing operations according to a relay control signal received from the MCU, wherein the relay module opens and closes at the zero-crossing point of the AC input signal to avoid arcing at the relay contacts;

[0010] The zero-point input detection unit provides a zero-point signal to the MCU, and the MCU compensates for the delay of the relay control signal so that the opening and closing of the relay module is synchronized with the zero-point of the AC signal.

[0011] As a preferred technical solution, the power supply module includes an AC-DC converter, which converts the AC input voltage of 90V to 220V into a stable DC voltage of 5V to provide power for the MCU and the zero point detection circuit.

[0012] As a preferred technical solution, the zero point detection circuit includes a photoelectric isolator for detecting the positive zero point and negative zero point of the AC input signal, and outputting a detection signal synchronized with the zero crossing point of the AC signal to the MCU.

[0013] As a preferred technical solution, the MCU performs a delay operation to control the opening and closing timing of the relay module according to the zero-crossing detection signal of the AC input signal through a built-in timing module.

[0014] As a preferred technical solution, the relay module includes an electromagnetic relay, and the electromagnetic relay is configured to perform opening and closing operations under a zero-crossing signal.

[0015] As a preferred technical solution, the relay module is used to control the opening and closing of smart home electrical appliances.

[0016] The beneficial effects of the present invention are as follows: through precise zero point detection and control, the relay opens and closes only at zero point, thus avoiding damage to the relay contacts caused by arcing, significantly extending the service life of the relay, and reducing the frequency of maintenance and replacement;

[0017] Since the oxidation and adhesion problems of relay contacts are effectively solved, this system can provide more reliable switching control in high-power equipment, ensuring the stability and safety of the equipment in high-load operating environments;

[0018] Opening and closing the relay at the zero point can reduce energy loss caused by arcing and improve the energy efficiency of the equipment. This has a significant energy-saving effect, especially in scenarios where the equipment is running for a long time.

[0019] The MCU in the utility model realizes accurate time compensation through the built-in timing module, ensuring that the relay can respond quickly after detecting the zero point signal, has high control accuracy and flexibility, and is suitable for different loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is the control principle diagram of the utility model. DETAILED DESCRIPTION

[0022] All features disclosed in this specification, or all steps in the disclosed methods or processes, except mutually exclusive features and / or steps, can be combined in any manner.

[0023] Any feature disclosed in this specification (including any appended claims, abstract, and drawings), unless otherwise stated, may be replaced by other equivalent or similar features. In other words, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0024] like Figure 1 As shown, the utility model provides a relay zero-point switch closing control system, which includes a power supply module, a zero-point detection circuit, a microcontroller unit (MCU) and a relay module.

[0025] The power module is used to convert the input alternating current (AC) into direct current (DC) and provide a stable operating voltage for each circuit component in the system.

[0026] The power module accepts an AC input voltage range of 90V to 220V, which it converts to a stable 5V DC power supply via an AC-DC converter, ensuring the proper operation of the system's MCU and zero-point detection circuit. This voltage conversion allows the system to adapt to varying power supply environments, ensuring reliability in a variety of operating scenarios.

[0027] Among them, the zero point detection circuit is used to detect the zero crossing point of the AC input signal to ensure that the opening and closing operations of the relay are synchronized with the zero crossing point of the AC power. The zero point detection circuit includes a zero point input detection unit and a zero point output detection unit, and the isolation of the AC signal and the control circuit is achieved through a photoelectric isolator;

[0028] Optoelectronic isolators effectively prevent high-voltage AC signals from directly affecting low-voltage control circuits, ensuring system safety and signal transmission accuracy. The zero-point detection circuit accurately detects the zero-crossing points of the AC signal on the live line, including both positive and negative zero points, and then sends the corresponding zero-point signal to the MCU.

[0029] The microcontroller unit (MCU) receives the zero-point signal from the zero-point detection circuit and processes the signal through the internal timing module;

[0030] The MCU adjusts the time delay of the relay control signal according to the zero-crossing signal of the AC input signal to ensure that the switching action of the relay occurs at the moment when the AC power crosses zero;

[0031] Specifically, after receiving the zero-point signal, the MCU makes appropriate time compensation to ensure that the control signal of the relay is synchronized with the zero point of the AC power;

[0032] This delay control method enables the relay to open and close when the voltage is zero, thereby avoiding arcing when the relay switches at the current peak, protecting the relay contacts and extending the service life of the relay.

[0033] The relay module is responsible for performing the actual opening and closing operations according to the control signal sent by the MCU. The relay module uses an electromagnetic relay. After receiving the MCU control signal, the relay module performs the opening and closing operation at the zero-crossing point of the AC input signal.

[0034] Since the relay opens and closes at the zero point of the AC power, the current is zero at this time, thus avoiding the generation of arcs, reducing the wear and oxidation of the relay contacts, preventing the relay from sticking or being damaged, and significantly improving the reliability and service life of the relay.

[0035] Furthermore, the relay module can be used to control a variety of smart home appliances, including smart sockets, smart switches, and smart lighting. Frequent switching of relays in these appliances can easily lead to arcing, which can damage the equipment. By controlling the opening and closing of the relay at the zero-crossing point of the AC power, the present invention not only effectively protects the relay but also improves the safety and durability of smart home appliances.

[0036] The utility model provides a relay control system with simple structure, rapid response and high reliability by combining a power module, a zero-point detection circuit, a microcontroller unit and a relay module. The system can effectively extend the service life of the relay and reduce equipment maintenance costs. It has broad application prospects and is particularly suitable for occasions requiring high-power switch control, such as smart homes and industrial control.

[0037] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that do not require creative effort should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection defined in the claims.

Claims

1. A relay zero-point switch closing control system, characterized in that: include: a power module, configured to convert AC power of an input power source into DC power; a zero point detection circuit for detecting a zero-crossing point of an AC input signal, wherein the zero point detection circuit comprises a zero-point input detection unit and a zero-point output detection unit, and is configured to detect a voltage zero-crossing point of the AC signal on the live line; a microcontrol unit electrically connected to the power module and the zero point detection circuit, the microcontrol unit receiving a zero point signal from the zero point detection circuit and adjusting a time delay of a relay control signal based on a detected zero crossing of the AC signal; a relay module connected to the microcontroller unit and performing opening and closing operations according to a relay control signal received from the microcontroller unit, wherein the relay module opens and closes at the zero-crossing point of the AC input signal to avoid arcing at the relay contacts; The zero-point input detection unit provides a zero-point signal to the microcontroller unit, and the microcontroller unit compensates for the delay of the relay control signal so that the opening and closing of the relay module is synchronized with the zero-crossing point of the AC signal.

2. The relay zero-point switch closing control system according to claim 1, characterized in that: in, The power supply module includes an AC-DC converter, which converts an AC input voltage of 90V to 220V into a stable DC voltage of 5V to provide power for the micro control unit and the zero point detection circuit.

3. The relay zero-point switch closing control system according to claim 1, characterized in that: The zero point detection circuit includes a photoelectric isolator for detecting the positive zero point and the negative zero point of the AC input signal and outputting a detection signal synchronized with the zero crossing point of the AC signal to the micro control unit.

4. The relay zero-point switch closing control system according to claim 1, characterized in that: The microcontrol unit executes a delay operation to control the opening and closing timing of the relay module according to the zero-crossing detection signal of the AC input signal through the built-in timing module.

5. The relay zero-point switch closing control system according to claim 1, characterized in that: The relay module includes an electromagnetic relay configured to perform a switching operation under a zero-crossing signal.

6. The relay zero-point switch closing control system according to claim 1, characterized in that: The relay module is used to control the opening and closing of smart home electrical appliances.

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