Control system for refrigerant metering solenoid valve

Details Control system for refrigerant metering solenoid valve Control system for refrigerant metering solenoid valve

1994-04-04

1995-11-07

Tanner, Harry B.

Refrigeration

Automatic control

Refrigeration producer

62211, 25112905, F25B 4900, F25B 4104

Patent

active

054638763

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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Buxton, Joseph, "Solid State Circuits Simplify Temperature Sensing & Control," Electronic Component News, vol. 37, No. 10, ECN Sensors Supplement, Oct. 1993.

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