Switching circuit for low AC - comprises two circuits in anti-series each comprising thyristor shunted by anti-parallel diode

摘要

The ac switching circuit acts as a switch or regulator for low alternating currents where high efficiency is not required. Only a relatively small and simple heat-sink is need. Each of two thyristors is coupled in anti-parallel to one of two diodes and controls the current flow. The two resulting anti-parallel circuits (311, 312 and 321, 322) are connected in anti-series between the ac supply and the load (1). The thyristors and diodes are mounted on a shared heat-sink (K). The triggering pulses for the thyristors are applied via a transformer (4) with two secondary windings.