Device for controlling alternating current circuit e.g. for single-phase induction motor, includes controllable AC switch unit directed into off-period state or conducting state by applying DC control voltages in first and second DC ranges

摘要

A controllable AC switch unit is formed by a bridge circuit of diodes (D1-D4) whose horizontal taps (HR,HL) form both connectors for the switch unit and by a MOS-FET or IGBT transistor (T) working with them. A switch device includes a controllable AC switch unit that can be directed into an off-period state by applying a DC control voltage within a first DC range or into a conducting state by applying a DC control voltage within a second DC range.