Control switching circuit for refrigerator set - has bistable relay and voltage transformer with voltage divider and charge capacitor in output circuit

摘要

The electromagnetic relay of the refrigerator control circuit has contacts in the refrigeration set supply circuit. A voltage transformer supplies the actuating coil of the relay with the excitation current via the switching path of a control switching device. The voltage transformer is supplied from the operating voltage source and its output voltage is below the operating voltage source, but at least equal to the relay response voltage. The voltage transformer (2) has a voltage divider with a charge capacitor (16) in the output circuit. A series connection of the switching path (3) of the switching device (4) and the relay energising coil (5) is in parallel to the charge capacitor. Preferably a bistable relay (6) with a permanent magnetic armature (19, 20) is used.