1. What is the principle of the delay switch?
1, the principle of delay switch is a switch extension, which can save electricity. There are touch delay switch and acousto-optic control delay switch in the delay switch. As long as you touch the touch panel of the switch or send out a sound signal, it will automatically light up. When people leave within 30 seconds to 75 seconds, it will automatically shut down, and the products of the Department of Energy are highly recommended.
2. Touch delay switch circuit is generally divided into two steps. First, the common lighting circuit is on the right, and the electronic switch part is on the left. VD 1 ~ VD4 and VS constitute the switch main circuit, and IC constitutes the switch control circuit. At ordinary times, VS is off and the light is off. VD 1 ~ VD4 outputs 220V pulsating DC, which is limited by R5, stabilized by VD5, and filtered by C2 to output about 12V DC for IC use. At this time, the LED lights up to indicate the position of the switch, which is convenient for use.
3. The acousto-optic delay switch is composed of a plurality of voice-controlled switches, light-controlled switches and light bulbs in series. When there is light, the photosensitive switch is turned off; When there is no light, the photosensitive switch is turned off. And then when there's a sound. The voice sensing switch is off. This forms a channel. Light the light bulb.
4.c is a double D flip-flop, so one of the D flip-flops is used to connect it to the monostable circuit. In the steady state, the 1 pin outputs a low level, and VS is turned off. When the human hand touches the electrode M, the human body leakage current is divided by R 1 and R2, so that the monostable circuit turns over in the positive half cycle, and the pin 1 outputs a high level, which is applied to the grid of VS through R4, so that VS is turned on and the lamp is lit. At this time, the output high level of the 1 pin charges the capacitor C 1 through R3, which can gradually increase the level of the 4-pin, until the transient ends, the circuit turns back to the steady state, the 1 pin suddenly becomes low level, VS loses the trigger voltage, the AC zero-crossing turns off, and the lights go out.
5, the scope of application of delay switches Delay switches are mainly used in stairwells, bathrooms, corridors and other places, where they must pass and do not need to be always on. The use of delay switch can also avoid the waste of ever-burning lamps and save electricity.
Second, the purchase strategy and characteristics of delay switch
1. There are many people who spend on purchasing quality. Inevitably, there will be buyers who don't know how to choose. First of all, look at whether the surface color is bright and whether there are burrs on the side.
2. Look at the appearance: Look at the appearance of the delay switch. Generally, switches with good texture have the functions of pressure resistance and deformation prevention, so pay special attention when purchasing.
3. Check brands: There are many brands of delay switches on the market. Not only should a good brand be the first choice, but its after-sales service is also very important, so it must be guaranteed.
4. Check the packaging: Next, we can also check the outer packaging of the products. Generally speaking, the products of regular merchants will be marked with trademarks, rated voltages, addresses, etc. On the package. If the printing is not clear, it can basically be judged as inferior.
The above are the contents of some delay switch principles provided by this small series and some characteristics of the purchase strategy of delay switch principles. The principle of delay switch is usually closed, which will prolong the time, so I want to know more about decoration consultation here. Please continue to follow us.