Solenoid valve with supply voltage variation compensation

Details Solenoid valve with supply voltage variation compensation Solenoid valve with supply voltage variation compensation

1988-08-24

1989-06-13

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

91429, 25112905, 318599, F25B 4104, G05B 1128

Patent

active

048380377

ABSTRACT:
A solenoid valve used as an expansion valve in a refrigeration circuit has an opening that varies as a function of the pulse width of a high frequency PWM (pulse width modulated) control signal. A transistor controls the electrical current delivered to the solenoid valve. The PWM control signal rapidly cycles the transistor on and off at a constant frequency that is sufficiently high to prevent the valve from having enough time within a cycle to move between fully open and closed. As a result, the valve balances at an intermediate position determined by the relative lengths of the on and off periods of each pulse cycle. The relative on-off pulse widths, often referred to as, "duty cycle", is varied in response to a temperature sensor to control the flow of refrigerant through the refrigeration circuit. The duty cycle is also adjusted to compensate for any variations in the supploy voltage applied across the solenoid valve.

REFERENCES:
patent: 4112703 (1978-09-01), Kountz
patent: 4459819 (1984-07-01), Hargraves
patent: 4473784 (1984-09-01), Morez
patent: 4527399 (1985-07-01), Lord
patent: 4548047 (1985-10-01), Hayashi et al.
patent: 4686835 (1987-08-01), Alsenz
patent: 4694228 (1987-09-01), Michaelis
patent: 4697431 (1987-10-01), Alsenz

Affiliated with

Also associated with

Rating

Solenoid valve with supply voltage variation compensation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Solenoid valve with supply voltage variation compensation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solenoid valve with supply voltage variation compensation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1267659