Control of a proportional valve using mains voltage

Details Control of a proportional valve using mains voltage Control of a proportional valve using mains voltage

1995-03-20

1998-03-03

Fleming, Fritz

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361154, H01F 718

Patent

active

057242232

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.

REFERENCES:
patent: 4446410 (1984-05-01), Yagura et al.
patent: 4631629 (1986-12-01), Mallick, Jr.
patent: 5191504 (1993-03-01), Narisawa et al.
A Schmitt, "The Hydraulic Trainer", Mannesman Rexroth GmbH, Nov. 1981, pp. 143-148.
W. Schmidt and O. Feuste "Optoelektronik-Kurz und bundig", Vogel-Verlag 1975, pp. 164 and 165.

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