What is the principle of time delay switch and its

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In the current era of progress, many things are beginning to become intelligent. Now there are many types of switches in the market. Today, Xiaobian wants to talk to you about Time-delay switches. Time-delay switches bring a lot of convenience to home. Let's see what the principle of Time-delay switches is and where they are applicable

in the current era, many things are beginning to become intelligent. Now there are many types of switches in the market. Today, I want to talk to you about the time-delay switch, which brings a lot of convenience to the home. Let's see what the principle of time-delay switch is and where it is applicable

what is the principle of the time delay switch

there is a metal sensor outside the time delay switch. When people touch it, a signal will be generated to trigger the triode to turn on and charge a capacitor. The capacitor forms a voltage to maintain a field effect tube to turn on the bulb and emit light. When the handle is removed, stop charging the capacitor. After a period of time, the capacitor is discharged, and the gate of the FET becomes a low potential, entering the cut-off state, and the bulb goes out

the dotted line of touch time-delay switch circuit is the general lighting circuit on the right and the electronic switch on the left. VD1 ~ VD4, vs constitute the main circuit of the switch, and IC constitutes the switch control circuit. At ordinary times, vs is in the off state and the light is not on. VD1 ~ VD4 output 220V pulsating DC through R5 current limiting, vd5 voltage stabilization, C2 filter output about 12V DC for IC use. At this time, the LED lights up to indicate the switch position, which is convenient for finding the switch at night

ic is a double-D trigger, which is connected into a monostable circuit with only one D trigger. In the steady state, pin 1 outputs low level and vs is turned off. When the hand touches the electrode m, the human body leakage current is divided by R1 and R2, and its positive half cycle turns over the monostable circuit. Pin 1 outputs a high level, which is added to the gate of vs through R4, so that vs is turned on and the light is on. At this time, the output high level of pin 1 is charged to capacitor C1 through R3, so that the level of pin 4 gradually rises until the end of the transient, the circuit returns to the steady state, pin 1 suddenly changes to the low level, vs loses the trigger voltage, turns off when the AC crosses zero, and the light goes out

application scope of time-delay switch

time-delay switch is mainly used in staircases, toilets, corridors and other places, in some places that must pass through the road and do not need to keep the lights on. The use of time-delay switch can avoid the waste of long-term lights and save electricity. Function features: 1. When in use, just touch the metal sheet of the switch to make it work. After a period of time, the switch will automatically close. 2. With the application of control, the switch automatically detects the insulation resistance to the ground, which makes the control more reliable and error free. 3. Contactless electronic switch, extending the service life of the load. 4. Touch the safety voltage of human body with the zero line voltage of metal sheet earth less than 36V, which is harmless to human body. 5. The unique two system design can directly replace the switch and drive all kinds of loads

the above is what the principle of time-delay switch and the scope of application of time-delay switch brought by Xiaobian to you. We will use time-delay switch on many occasions. The above introduction hopes to let you know more about this knowledge. If you want to know other relevant information, please continue to pay attention to this website, and look forward to more highlights





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