DEFROSTING TIMER Russian patent published in 2009 - IPC H01H43/14 

FIELD: physics.

SUBSTANCE: defrosting timer comprises power supply source, time counter, heater, detector of defrosting completion, compressor, voltage limiter, the first and second rectifiers, the first and second quenching elements, three-pin electromagnet relay, movable contact of which is connected to the second pole of power supply source; counter inlet of time counter via heater is connected to the first pole of power supply source, and via detector of defrosting completion - to the second fixed contact of relay; common output of time counter is connected to the second pole of power supply source; output of time counter is connected to the first output of relay winding, the second output of which via chain from serially joined first rectifier and first quenching element is connected to the second fixed contact of relay; common point of the second output of relay winding and chain of the first rectifier and the first quenching element is connected to the common output of time counter via voltage limiter and via chain of the second rectifier and second quenching element is connected with the first fixed contact of relay; the first fixed contact of relay via compressor is connected to the first pole of power supply source.

EFFECT: simplified design and increased reliability of operation.

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