Control of a proportional valve using mains voltage
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United States of America Patent
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Mar 3, 1998
Issued Date -
N/A
app pub date -
Mar 20, 1995
filing date -
Jan 22, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A proportional valve has an output proportional to an electrical input signal. In a preferred embodiment, the valve is actuated by a proportional solenoid having a coil which is controlled by a control signal in proportion to voltage or current. The proportional solenoid is controlled by a relatively high current such as a rectified mains voltage. A control circuit ensures that the coil of the proportional solenoid is not overloaded. Particularly, it ensures that a maximum current value is not exceeded. In this way, the mains supply required in prior art devices may be eliminated.
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