Alternately low and high input-impedance detector for use in a G

Details Alternately low and high input-impedance detector for use in a G Alternately low and high input-impedance detector for use in a G

1980-11-07

1983-03-29

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 42, H02H 332

Patent

active

043785794

ABSTRACT:
A ground fault interrupter employs a single differential transformer that is made of a ferrite toroid with an eleven turn secondary winding. The transistorized fault detector circuit is for the most part formed on a silicon integrated chip. The hot-wire-to-ground-fault detector portion is an impedance-transforming circuit that when energized presents a low impedance, i.e. virtually a short circuit, to the secondary winding. A multiplexing circuit periodically de-energizes the hot-wire-to-ground-fault detector causing it to present a high input impedance during periods when neutral-wire-to-ground faults are sensed via the transformer.

REFERENCES:
patent: 3879639 (1975-04-01), Sircom
patent: 3963959 (1976-06-01), Howell
patent: 3973171 (1976-08-01), Howell
patent: 4001646 (1977-01-01), Howell
patent: 4285022 (1981-08-01), Lewiner et al.

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