Pulse width modulation with discharge to suction bypass
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United States of America Patent
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-
Feb 12, 2008
Grant Date -
Dec 7, 2006
app pub date -
Dec 26, 2006
filing date -
Jun 6, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A pulse width modulation control is provided for a suction valve located on a suction line. When the flow rate through a refrigerant system needs to be reduced, the suction valve is rapidly cycled from an open position to a closed position. A bypass line connecting compressor discharge to compressor suction with a bypass valve and a discharge valve positioned on the discharge side of the compressor are also provided. When the control closes the suction valve, it also closes the discharge valve to prevent the refrigerant to backflow into the bypass line, and, at the same time, the control opens the bypass valve. Opening of the bypass valve reduces discharge pressure, leading to reduction in compressor power consumption and subsequent operating efficiency gain.
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