Circuit for controlling an electromagnet

Details Circuit for controlling an electromagnet Circuit for controlling an electromagnet

1981-09-04

1984-09-25

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

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

361154, H01H 4704, H01H 4732

Patent

active

044738625

ABSTRACT:
A control circuit for an electromagnet includes a main current control element in series with the electromagnet winding and controlled so as to switch on and pass a "pull-in" current for an initial period and to control the current to a lower "hold" level during a subsequent period. A capacitor is connected in series with a diode and a transistor across the winding and the transistor is controlled to switch on during the change from "pull-in" to "hold" so that the capacitor is charged up during this change. A second transistor is connected in series with a second diode to permit reverse current flow from the capacitor to the winding during switch-off to hasten collapse of the flux in the winding and overcome the drop-out delaying effect of eddy currents in the electromagnet core.

REFERENCES:
patent: 3064165 (1962-11-01), Kennedy
patent: 3549955 (1970-12-01), Paine et al.
patent: 4112477 (1978-09-01), Sherwin
patent: 4148090 (1979-04-01), Kawai et al.
patent: 4173030 (1979-10-01), Rabe
patent: 4318155 (1982-03-01), Thomas

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