Control system for refrigerant metering solenoid valve
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United States of America Patent
Stats
-
Nov 7, 1995
Grant Date -
N/A
app pub date -
Apr 4, 1994
filing date -
Apr 4, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system including a control circuit and a sensing circuit controls an expansion valve in a refrigeration system using pulse width modulation. The control circuit includes a ramp generator, a pulse width modulator, and a power switch. In response to input from the sensing circuit, the control circuit produces a control signal which cyclically opens and closes the valve. The average flow rate through the valve is varied in accordance with a condition of the refrigeration system which is detected by the sensing circuit.
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Family
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