Adaptive defrost control circuit with relay power saving feature
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United States of America Patent
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Sep 15, 2009
Grant Date -
Sep 13, 2007
app pub date -
Mar 9, 2006
filing date -
Mar 9, 2006
priority date (Note) -
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Abstract
A defrost heater relay control circuit having reduced power consumption during a de-energized mode of operation is provided. The relay drive circuit utilizes a series connected capacitor to introduce a phase shift in the AC current waveform such that the amount of real power dissipated in the circuit during periods when the defrost heater control relay is de-energized is greatly reduced. This effectively shorts out the relay drive voltage without generating heat due to real power dissipation through the switched circuitry that disables the relay.
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