Active arc suppression for switching of direct current circuits

Details Active arc suppression for switching of direct current circuits Active arc suppression for switching of direct current circuits

1982-08-09

1984-03-20

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

307134, 361 2, H02H 722

Patent

active

044384726

ABSTRACT:
A DC arc suppression circuit is disclosed for suppressing arcs which occur across a mechanical switch or circuit breaker. Several embodiments are described which employ a bipolar transistor to actively shunt the load current around the mechanical switch when the contacts are opened for a period of time long enough to enable the contacts to be separated by a sufficient distance to prevent arcing. Arcing is prevented when contact bounce occurs upon closure of the contacts, by providing a diode connected in parallel with the base-emitter portion of the circuit which restores the arc suppressing capacity of the circuit almost immediately upon the first closure of the contacts.

REFERENCES:
patent: 2958808 (1960-11-01), Miller
patent: 3075124 (1963-01-01), Bagno
patent: 3184619 (1965-05-01), Zydney
patent: 3588605 (1971-06-01), Casson
patent: 3870905 (1975-03-01), Chikazawa
patent: 3912941 (1975-10-01), Passarella
patent: 4250531 (1981-02-01), Ahrens

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