Refrigeration – Automatic control – Refrigeration producer
Patent
1981-02-26
1983-04-19
Wayner, William F.
Refrigeration
Automatic control
Refrigeration producer
364557, 374170, F25B 100, G01K 702
Patent
active
043801552
ABSTRACT:
A refrigerator includes a compressor, a condenser, an evaporator, an evaporator fan and a temperature sensing circuit which includes a thermistor located to sense the average temperature of the cabinet air and a potentiometer manually adjustable to a desired temperature set point. The temperature sensing circuit also includes a first comparator stage which indicates whether the average temperature of the cabinet air is above or below a first value, the first comparator having little or no hysteresis in its response so that small changes in temperature can be detected. A second comparator stage indicates whether a signal at its input is greater or less than a second value, the second comparator stage having substantial hysteresis in its response to provide high noise immunity. An integrator is interposed between the first comparator stage and the second comparator stage to further enhance noise suppression.
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Nagao et al., "Electronically Controlled Refrigerator with Electronic Thermometer", TOSHIBA REVIEW, International Edition, No. 120, Mar.-Apr. 1979, p. 34.
Paddock Stephen W.
Tershak Andrew T.
Wayner William F.
Whirlpool Corporation
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