Metallic current limiter

Details Metallic current limiter Metallic current limiter

1990-04-03

1991-09-17

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379399, 379405, H04M 1174

Patent

active

050502107

ABSTRACT:
A circuit for the non-linear limiting of the metallic current flowing in telephone line conductors. The circuit senses the metallic current flowing in the conductors. If that current exceeds a predetermined limit, the circuit provides from a controlled and variable voltage source a voltage across the conductors whose amplitude is reduced from the essentially constant amplitude voltage provided across the conductors when the current does not exceed the limit. The reduction in voltage amplitude is sufficient to maintain the metallic current at the limit.

REFERENCES:
patent: 4431869 (1984-02-01), Sweet
patent: 4485341 (1984-11-01), Welty et al.
patent: 4612417 (1986-09-01), Toumani
patent: 4716358 (1987-12-01), Futcio
patent: 4800586 (1989-01-01), Meier

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