Inductively activated control and protection circuit for...

Details Inductively activated control and protection circuit for... Inductively activated control and protection circuit for...

F - Mech Eng,Light,Heat,Weapons

25

B

F25B 49/02 (2006.01) F25D 29/00 (2006.01)

Patent

CA 2281977

The present invention involves an inductively activated silicon switch for a control and protection circuit for motors and compressors. The circuit includes a logic gate for combining both motor control and protection functions. The logic gate has inputs from a thermostat, a compressor shell temperature circuit, a fan overheat detection circuit, a motor start relay circuit, and motor load sensing circuits. The logic gate output is connected to an oscillator for inductively activating the power output stage, as well as a start relay, a compressor shell temperature hysteresis circuit, and a fan timer circuit connected to the fan control circuit. The control circuitry further includes an over-ride circuit for manually allowing a limited number of immediate restart attempts.

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