In the current era, many things have begun to become intelligent. Now there are many types of switches in the market. Today, Xiao Bian wants to talk to everyone about delay switches , and the time delay switch brings a lot of convenience to the family. See what the delay switch principle is and where it applies!
What is the principle of delay switch?
Outside the time delay switch there is a metal sensor. When the person touches it, it will generate a signal, trigger the transistor to conduct, charge a capacitor, and the capacitor forms a voltage to maintain a field effect tube to turn on the light bulb. When the handle is removed, the charging of the capacitor is stopped, and 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 light bulb goes out.
Touch-type delay switch circuit The right side of the dotted line is an ordinary lighting circuit, and the left side is an electronic switch section. VD1 ~ VD4, VS constitute the main circuit of the switch, IC constitutes a switch control loop. Normally, VS is off and the light is off. VD1 ~ VD4 output 220V ripple current through R5 current limit, VD5 regulator, C2 filter output about 12V DC power supply IC use. At this point, the LED emits light, indicating the position of the switch and facilitating the search for the switch at night.
The IC is a double-D flip-flop, which is connected to a monostable circuit using only one of the D flip-flops. In steady state, pin 1 outputs a low level, and VS turns off. When the human hand touches the electrode M, the body leakage current is divided by R1 and R2, and the positive half cycle makes the monostable circuit turn over, and the 1st pin outputs high level, and is added to the gate of VS via R4 to make the VS turn on. bright. At this time, 1-pin output high level is charged by R3 to capacitor C1, so that the 4-pin level gradually increases until the end of the transient state, the circuit returns to a steady state, a 1-pin mutation is low, VS loses the trigger voltage, AC zero crossing When it is turned off, the light goes out.
Application of time delay switch
Delay switch is mainly used in stairwells, bathrooms, corridors and other places, in some necessary roads and does not require constant lighting. Using the delay switch can avoid the waste of long lamps and save electricity. Features: 1, just touch the switch to use the metal sheet that is turned on, extended for some time after the switch automatically shut down. 2, application control, switch automatically detects the insulation resistance of the ground, control more reliable and error-free operation. 3, no contact electronic switch, extend the life of the load. 4. Touch the safety voltage of the human body with the metal pole ground pole neutral voltage less than 36V, which is harmless to the human body. 5, unique two-system design, direct use instead of switches, can drive all kinds of loads.
The above is what the delay switch principle that Xiao Bian brings to us is and the application scope of the delay switch . In many occasions we will use the delay switch. The above introduction hopes to let you know more about this knowledge, if you want For other related information, please continue to pay attention to this site, more exciting so stay tuned!
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