Switch-arc preventing circuit

Details Switch-arc preventing circuit Switch-arc preventing circuit

1979-08-30

1981-02-10

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

361 56, 179 18G, 307135, H02H 722

Patent

active

042505313

ABSTRACT:
A switch-arc preventing continuous current circuit for protecting pulsing contact telephone exchange switches, the circuit having a first transistor in circuit with and controlled by a control transistor, the power electrodes of the first transistor being disposed in circuit between an inductive coil of a stepping solenoid and a protected switch, a bias voltage source connected to a terminal of the protected switch by a blocking diode and a pair of resistors in series, and a metal oxide varistor in shunt across the power electrodes of the first transistor.

REFERENCES:
patent: 3697704 (1972-10-01), Jacobs
patent: 3786314 (1974-01-01), Misch
patent: 3912941 (1975-10-01), Passarella
patent: 3971961 (1976-07-01), Inami et al.
patent: 4075510 (1978-02-01), Pascente

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