Power control apparatus.

摘要

A pair of static induction thyristors (1, 2), which are coupled in parallel in the opposite bias directions between an AC power source (13, 105, 400, 501) and a load (14, 108, 409, 504), is turned on by a light signal and is turned off by natural commutation, a light signal or an electric signal. The turn-off light signal is generated within a phase angle of 90 DEG in the time axis around the zero-cross point of the AC voltage from the AC power source (13, 105, 400, 501).