ROOM TEMPERATURE CONTROLLER Russian patent published in 1995 - IPC

FIELD: automatic temperature control. SUBSTANCE: device having series-connected triac control unit and triac, a.c. current source connected via triac to first heating element, d.c. voltage source incorporating voltage regulator diode, ripple capacitor, and diode, ballast element in the form of fnba drive control winding one of whose leads is connected to voltage regulator diode lead and other one, to a.c. current source, is provided in addition with first heating element to triac anode. One of capacitor leads is connected between first and second heating elements and tie other lead is connected to triac cathode. EFFECT: improved reliability and safety in operation. 2 cl, 1 dwg