Fast cycling, low power driver for an electromagnetic device

Details Fast cycling, low power driver for an electromagnetic device Fast cycling, low power driver for an electromagnetic device

1980-05-30

1982-01-12

Miller, J. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

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

361155, H01H 4732

Patent

active

043108687

ABSTRACT:
A driver for an electromagnetic device, e.g. a solenoid, is capable of driving the device at a fast cycling rate while dissipating minimal power. In response to an actuating signal, a capacitor connected to a high voltage source supplies a high level current to the device for a short time interval until the capacitor is charged. Thereafter, a resistor connected to a low voltage source, supplies a low level current to the device, thus minimizing power dissipation. In response to the cessation of the actuating signal, a transistor connected in parallel with the capacitor turns on, and acts as a low impedance in parallel with the capacitor, to rapidly discharge the capacitor. Once discharged, the capacitor again may supply high level current to the device when the actuating signal is reapplied.

REFERENCES:
patent: 3064165 (1962-11-01), Kennedy
patent: 3558997 (1971-01-01), Derc
patent: 3582981 (1971-06-01), Dalyai
patent: 3852646 (1974-12-01), Mason
patent: 4112477 (1978-09-01), Sherwin

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