Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
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.
Dantlgraber Jorg
Feuser Alfred
Kunkel Helmut
Schaffer Rudolf
Fleming Fritz
Mannesmann Rexroth GmbH
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