Refrigeration – Automatic control – Time or program actuator
Patent
1975-02-07
1976-03-30
Wayner, William E.
Refrigeration
Automatic control
Time or program actuator
62230, 317 13R, 317 31, H02H 706, F25B 4900
Patent
active
039465748
ABSTRACT:
The compressor motor of an air conditioning unit is operatively coupled to a A.C. line through a solid state electronic switch. Triggering signals for the switch are supplied from an oscillator circuit which is D.C. isolated from the switch, the trigger signals being coupled via transformer coupling. The oscillator is in turn thermostatically controlled in accordance with the cooling demand. The oscillator is also interlocked via a photocoupling device with an electronic timer circuit and with an undervoltage sensing circuit. The timer imposes a mandatory minimum delay between successive energizations of the compressor motor thereby permitting time for pressures in the refrigeration circuit to subside. The undervoltage sensing circuit is responsive to an electrical brownout condition for shutting down the motor should an electrical brownout condition occur. The undervoltage detector also contains a blackout detector section which shuts down the motor more rapidly during more extreme undervoltage conditions.
REFERENCES:
patent: 3535591 (1970-10-01), Holmquest
patent: 3684172 (1972-08-01), Evalds
patent: 3836790 (1974-09-01), Becker
patent: 3864611 (1975-02-01), Chang
Chrysler Corporation
Wayner William E.
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