TRIAC AC VOLTAGE CHANGER Russian patent published in 1997 - IPC

FIELD: ac-to-ac voltage changers. SUBSTANCE: device has triac connected in series with load to ac mains leads, first rectifier bridge one of whose ac leads is connected to trial gate electrode and other lead to its anode, and its DC leads are connected to power circuit leads of transistor switch whose control input is connected to optocoupler optical output; optocoupler input control circuit is connected to control voltage supply; device also has second rectifier bridge whose AC leads are connected between anode and cathode of triac and DC leads are connected through resistor in parallel with optocoupler output circuit. EFFECT: improved reliability of device due to electric isolation between control and switching voltages without using electromagnetic relay. 1 dwg