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 ...

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).

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 ...