Current limiting battery feed arrangement

Details Current limiting battery feed arrangement Current limiting battery feed arrangement

1993-03-23

1994-07-26

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379399, 379412, 379402, 379404, H04M 1900

Patent

active

053331966

ABSTRACT:
A current limiting circuit in a battery feed arrangement provides a variable DC resistance for limiting subscriber loop current to a threshold value. The current limiting circuit also presents a low AC impedance so that no imbalance is introduced between tip and ring leads of the subscriber loop. The current limiting component is a low ON resistance power MOSFET in the ring side of the battery feed arrangement. The current limiting circuit is self protecting in the event of lightning strikes and AC power signals either induced or short-circuited.

REFERENCES:
patent: 4560834 (1985-12-01), Huft
patent: 5010293 (1991-04-01), Ellersick
patent: 5138658 (1992-08-01), Carter et al.

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