What is the principle of the delay switch? There is a metal sensor on the outside of the delay switch. When a person touches it, it will generate a signal to trigger the transistor to conduct. Charge a capacitor. The capacitor forms a voltage to maintain a FET. When the handle is removed, the charging of the capacitor is stopped. After a period of time, the capacitor is discharged, the gate of the FET becomes a low potential, enters the cut-off state, and the bulb is extinguished. The touch delay switch circuit is on the right side of the dotted line is the ordinary lighting circuit, and the left part is the electronic switch part. VD1 ~ VD4, VS constitute the main circuit of the switch, IC constitutes the switch control loop. Normally, VS is in the off state and the light is off. VD1 ~ VD4 output 220V pulsating DC power through R5 current limit, VD5 voltage regulator, C2 filter output about 12V DC power for IC use. At this time, the LED lights up, indicating the position of the switch, which is convenient for finding the switch at night. The IC is a dual-D flip-flop, and only one of the D flip-flops is used to connect it to a monostable circuit. In steady state, the 1 pin outputs a low level, and the VS turns off. When the human hand touches the electrode M, the human body leakage current is divided by R1 and R2, and the positive half circuit turns the monostable circuit, the 1 pin outputs the high level, and the R4 is applied to the gate of the VS to turn on the VS. bright. At this time, the output of the 1 pin is high, and the capacitor C1 is charged through R3, so that the level of the 4 pin is gradually increased until the transient ends, the circuit is turned back to the steady state, the 1 pin is abruptly changed to the low level, the VS loses the trigger voltage, and the alternating current crosses zero. The time is turned off and the light is turned off. Trading Club provides you with many types of switch products, including time delay switches, such as: Siemens switch socket panel vision white series light touch delay switch, switch high quality silver alloy contacts, good electrical conductivity, socket contact piece with high elastic tin Phosphor bronze, good elasticity, smooth insertion and removal. The scope of the delay switch The time delay switch is mainly used in places such as stairwells, toilets, corridors, etc., where some must pass the road and do not need to be constantly lit. The use of the delay switch can avoid the waste of long light and save electricity. Features: 1. When using, just touch the metal piece of the switch to turn on the work. After a period of time, the switch will automatically turn off. 2, application control, the switch automatically detects the insulation resistance to the ground, control more reliable and error-free operation. 3. Non-contact electronic switch to extend the service life of the load. 4, touch the metal plate ground zero voltage line voltage is less than 36V human body safety voltage, the use is harmless to the human body. 5, unique two-system design, directly replace the switch, can drive all kinds of loads. COB Light
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What is the principle of the delay switch? Introduction to the application range of the delay switch
For the switch, life can be seen everywhere, but with the development of the times, more and more smart devices are used in family life, today Xiaobian will introduce the delay switch, and the principle and scope of the delay switch .