光电耦合器,也叫光隔离电路。该电路是利用检测发射光原理,输入一个光发射器,输出一个光电检测器,这两个部分之间用透明绝缘体隔离。光发射器可以是:发光二极管、白炽灯、射线管等。检测器可以是:光敏二极管、光敏三极管、光敏电池、光敏闸流管、光敏电阻、达林顿型光敏三极管等。发射器和检测器可以组成不同的光电耦合器。 Optocouplers, also known as optical isolation circuits. The circuit is to use the principle of detecting emitted light, enter a light emitter, the output of a photodetector, the two parts isolated with a transparent insulator. Light emitters can be: light-emitting diodes, incandescent lamps, ray tubes and the like. Detector can be: photodiode, phototransistor, photocells, thyristor, photoresistor, Darlington type phototransistor and so on. Transmitter and detector can be composed of different optocouplers.