Phase-fired controller
From Wikipedia, the free encyclopedia
Phase-fired control (PFC), also called phase cutting or phase-angle control, is a method for power limiting, applied to AC voltages.[1] It works by modulating a thyristor, SCR, triac, thyratron, or other such gated diode-like devices into and out of conduction at a predetermined phase angle of the applied waveform.[2]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/0/07/Regulated_rectifier.gif/320px-Regulated_rectifier.gif)