Today, we will introduce the trigger form of the switch. See below for details.
A new generation of optoelectronic switching devices manufactured by integrated circuit technology and SMT surface device technology have intelligent functions such as delay, broadening, external synchronization, anti-interference, high reliability, stable working area and self-diagnosis.
This novel photoelectric switch is an electronic switch of an active photoelectric detection system using pulse modulation. The cold light sources used include infrared light, red light, green light and blue light. It can be contactless and quickly control the shape of various solids, liquids, transparent bodies, blackbodies, soft bodies and smoke without damage. Motion and action. The contact stroke switch of driving waterproof and explosion-proof switch has some shortcomings, such as low response speed, poor accuracy, easy damage to detected objects and short service life, while the transistor has a short action distance close to the switch and can not directly detect non-metallic materials. However, the new photoelectric switch overcomes the above shortcomings, and has small size, multi-function, long life, high accuracy, fast response, long detection distance and strong anti-light, electric and magnetic interference ability.
The simple circuit consists of a large capacitor, a large resistor and an insulated gate FET. When triggered, the capacitor is charged, and the trigger cycle is completed. At this time, the gate capacitance of the insulated gate FET acts on the gate. High voltage, field effect transistor conduction, gate drain connected to a load, load will work.
The gate resistance of the switch is very high to the ground, usually hundreds of megaohms, so the discharge is slow, so we need to add a discharge resistance, usually adjustable resistance, to adjust the delay time. The resistance is large, the delay time is long, the resistance is small and the delay time is short. When the capacitor is dead and the gate voltage is dead, the FET enters the cut-off state and the drain load stops working.