What is the principle of touching induction lamp?

The principle of touch induction lamp is that the electronic touch ic installed inside forms a control loop with the electrode plate under the touch of the lamp.

When the human body touches the sensing electrode, the touch signal generates a pulse signal through pulsating direct current and sends it to the touch sensing end, and then the touch sensing end will send out a trigger pulse signal to control turning on the light.

If you touch it again, the touch signal will generate a pulse signal through pulsating DC and send it to the touch sensing end. At this time, the touch sensor will stop sending out the trigger pulse signal, and when the alternating current crosses zero, the lamp will naturally go out.

But sometimes it will light itself after power failure or voltage instability. If you touch paper or cloth and have excellent sensitivity to the received signal, you can control it.

Extended data

Induction lamp in the corridor can be roughly divided into:

1, voice control

2. Ultrasonic control

3. Infrared control

When someone enters the induction range of the switch, the special sensor detects the change of the infrared spectrum of the human body, and the switch automatically turns on the load. People never leave, and the switch keeps turning on; After people leave, the switch will automatically turn off the load after a delay, and the lights will be on when people are away, which is friendly, convenient, safe and energy-saving.

Voice control and ultrasound are similar to infrared rays, except that one is to detect the sound emitted by an object, and the other is to actively emit ultrasound, which detects the frequency change after the ultrasound hits a moving object. It is a voice control element or touch type.

Sound is produced by vibration, and sound waves propagate in the air. If you encounter a solid, you will transfer this vibration to the solid. The sound control component is a material sensitive to vibration. When there is sound, they are turned on (resistance decreases), and when there is no sound, they are turned off (resistance increases).

Through the delay circuit and chip, the circuit can be turned on for a period of time when there is sound. Whether it's a voice control light or something, it's the same principle, but the final load is different.

Double-button touch switch and single-button touch delay switch. "Open" the touchpad, when touched by a human hand, the human body induced clutter signal acts on the foot of the low-level trigger IC of the time base circuit, the circuit is set, and the high level is output, the relay K is electrically attracted, its normally open contact is closed, and the controlled appliance is energized to work.

M2 is the "off" touchpad. Once touched, the clutter signal induced by human body is added to the threshold IC of 555, the circuit is reset, the pin outputs low level, the relay loses power and trips, and the controlled appliance stops working.