G - Physics – 05 – D
Patent
G - Physics
05
D
340/154, 341/27
G05D 23/00 (2006.01) F25D 17/06 (2006.01) G01K 3/04 (2006.01) G05D 23/24 (2006.01)
Patent
CA 1173933
"TEMPERATURE SENSING CIRCUIT WITH HIGH NOISE IMMUNITY" ABSTRACT OF THE DISCLOSURE 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 sub- stantial 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.
358519
Paddock Stephen W.
Tershak Andrew T.
Corporation Whirlpool
Kirby Eades Gale Baker
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