Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1983-09-30
1985-05-07
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
H01H 4732
Patent
active
045161852
ABSTRACT:
A system for controlling current flow to the actuating coil of a contactor or the like. A solid state switch is provided for gating current flow to the coil, and operated by an oscillator stage. A time delay causes the oscillator to operate at a high duty cycle when power is initially applied, allowing a relatively high current to flow to the contactor coil to operate the contacts. Subsequently the control causes the oscillator to operate at a low duty cycle, wherein the solid state switch passes a significantly lower current flow to the coil to maintain the contacts in position.
REFERENCES:
patent: 3904938 (1975-09-01), Martin
patent: 4293888 (1981-10-01), McCarty
patent: 4381532 (1983-04-01), Arnold
patent: 4399483 (1983-08-01), Phelan
Culligan John C.
Stich Frederick A.
Williams Conrad F.
Eisenzopf Reinhard J.
James J. L.
Powers F. W.
Siemens-Allis, Inc.
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