Current limiting battery feed arrangement
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United States of America Patent
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-
Jul 26, 1994
Issued Date -
N/A
app pub date -
Mar 23, 1993
filing date -
Apr 15, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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