Electromagnetic control circuit

Details Electromagnetic control circuit Electromagnetic control circuit

1982-07-01

1984-05-08

Goldberg, E. A.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

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

361205, 307252B, H03K 1772

Patent

active

044478496

ABSTRACT:
A control circuit is disclosed for limiting the polarity and duration of current flowing through an electromagnetic device which is coupled to an alternating current potential source. The control circuit is coupled in series with the electromagnetic device and a switch. The control circuit includes a gate controlled conduction device and circuitry which is utilized to selectively gate that device only during one positive half cycle following the closing of the switch. A second gate controlled conduction device is utilized to discharge a capacitor in timed relationship with the alternating current potential source and prevent recharging of that capacitor until the switch is opened and then closed again.

REFERENCES:
patent: 3267337 (1966-08-01), Doyle et al.
patent: 3557381 (1971-01-01), Henry
patent: 4333019 (1982-06-01), Weigert

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