Integrated refrigeration control
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United States of America Patent
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-
Feb 8, 2005
Grant Date -
Dec 9, 2004
app pub date -
Jun 9, 2003
filing date -
Jun 9, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An integrated refrigeration control (IRC) module is disclosed which combines both thermal and electrical protection to the main components of a refrigerator and uses sensor inputs to control the compressor. The IRC module employs triacs (Q2, Q4, Q6, Q8, Q10) to control power to the start and run windings of the compressor motor, evaporator and compressor fans and the defrost heater. The module adaptively controls the refrigerator defrost cycle using pervious defrost cycle run times to determine new cumulative compressor run times. Also disclosed is the use of preventive defrost periods performed for brief periods at intervals between portions of the cumulative compressor run time.
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