Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1988-11-14
1990-05-29
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
323287, 361187, 361189, H01H 4732
Patent
active
049300407
ABSTRACT:
A current regulator for an inductive load especially for a coil of an electromagnetic solenoid valve. The current flow through the coil is regulated and compared by means of an operational amplifying nominal current value. The inductive load comparator is initially controlled by a first conductive diode. A second diode having a higher voltage rating than that of the first diode is rendered conductive whenever the nominal current value in an inductive coil decreases rapidly. The current regulator ensures that the magnetic energy in the inductive load remains unchanged when the nominal current value remains constant or changes in small amounts. When a rapid decrease of the coil current occurs, the second diode is rendered conductive.
REFERENCES:
patent: 4620260 (1986-10-01), Oshizawa et al.
patent: 4633094 (1986-12-01), Knudsen
patent: 4661766 (1987-04-01), Hoffman et al.
Binarsch Jurgen
Bode Jurgen
Danne Lutz
Lissel Norbert
Gaffin Jeffrey A.
Kasper Horst M.
Pellinen A. D.
Wabco Westinghouse Fahrzeugbremsen GmbH
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