电感式接近开关工作原理
Working principle of inductive proximity switch
目标 LC 震荡器 开关级 放大输出级
Object LC oscillator switching stage magnified output stage
电感式接近开关由三大部分组成：振荡器、开关电路及放大输出电路。振荡器产生一个变交磁场，并
达到感应距离时，在金属目标内产生涡流，从而导致振荡衰减，以至停振。
振荡器振荡及停振的变化被后级放大电路处理并转换成开关信号，触发驱动控制器件，从而达到非接
触式之检测目的。
目标离传感器越近，线圈内的阻尼就越大，阻尼越大，传感器振荡器的电流越小。
Inductive proximity switch is composed of three parts: oscillator, switch circuit and magnified output
circuit.The oscillator will generate an alternating electric field.When the metal object approaches this electric
field and reaches the induction distance,whirlpool will generate in metal object,resulting in attenuation of
vibrati on and then stop.The changeof vibration and stop of oscillator is treated by behind stage magnified
circuit and converted to switching sign,triggering driving control for non-contact detection.