三端双向可控硅（Triac）是一种高速固态器件，可以在正弦波形的两个方向上切换和控制交流电源。 本文引用地址： 晶闸管和三端双向可控硅都可以用于控制灯具、电机或加热器等。然而，使用晶闸管控制此类电路的一个问题是，像二极管一样，晶闸管是一种 ...

This universal triac controller circuit with optocoupler solves the problem that triacs have when functioning at low temperatures (triac needs higher gate current) by adding a transistor at the output ...

Non-insulated power supplies are often required when a power semiconductor, which has to be controlled using this supply, has its drive reference connected to the mains (line or neutral terminal).