What is the principle of delay switch?

Delay switch is also a kind of switch, which I believe most people know, but many people don't know what the principle of delay switch is. In this case, in the next article, we will take you to understand the principle of delay switch. And what are the purchasing skills and brands of delay switches?

1. What is the principle of the delay switch?

1. principle of delay switch There is a metal sensor outside the delay switch. When a person touches a transistor, a signal is generated to trigger the transistor. Charge the capacitor. The capacitor forms the voltage that holds the FET. Loosen the knob, the capacitor stops, the capacitor discharges, the gate of FET turns off at low potential, and the light bulb goes out.

2. The principle of delay switch The touch delay switch circuit on the right side of the dotted line is a common lighting circuit, and the electronic switch element on the left side. VD 1 to VD4, VS constitutes the main switch circuit, and IC constitutes the switch control loop. Usually VS is off and the indicator light goes out. VD 1 to VD4 output 220V pulse DC power supply. Through R5 current limiting and VD5 voltage regulation, C2 filter outputs about 12V DC power supply for IC use. At this time, the LED indicator lights up to indicate the position of the switch, which is convenient for finding the switch at night.

3. The IC of the delay switch principle is a double D flip-flop, and the stable circuit is only connected with a D flip-flop. Under normal circumstances, the 1 pin outputs a low level, and VS is turned off. The aperture point with finger brightness of VS contacts the leakage current through electrode M body R 1, R2 voltage divider, positive half-cycle monostable inverter circuit, high output pin and VSR4 gate. At this time, the high-level output pin charges the capacitor C 1 from R3, so that the level of pin 4 gradually rises until the transient ends. The steady-state circuit sets the 1 pin to AC current time off again, and the indicator lamp goes out.

Second, what are the skills for choosing a delay switch?

1, depending on the quality, there are many buyers in the market. Inevitably, people don't know how to choose a good texture of delay switch. Generally, the surface should be bright without burrs on both sides.

2. Check the appearance and check the appearance of the delay switch. Usually the texture switch has compression deformation, so be careful when buying.

3. Look at the brand. There are many brands of delay switches in the market. You need to choose a good brand as the first choice. After-sales service is very important and needs specific protection.

3. What brands of delay switches are there?

1, France Legrand was founded in 1860, which is a company dedicated to providing complete electrical solutions for all kinds of buildings. There are 32 commercial brands, 265,438+05,000 different product lines, 4,600 electrical industry patents, branches in 80 countries and 36,000 employees. Products are sold to more than 65,438+080 countries, with annual sales of about 4.5 billion euros.

2.Bull is an electric company, which is committed to providing consumers with various power connection solutions through innovative technologies, intelligent products and quality services. We constantly observe the needs and desires of consumers, and strive to provide innovative technologies for hundreds of millions of families and provide a safe and comfortable power environment. We are constantly upgrading innovative industries in the intelligent, comfortable and convenient future power era. I'm ahead.

What is the principle of delay switch? And what are the purchasing skills and brands of delay switches? This small series is introduced here, and I hope the above articles will be very helpful to parents.