Power supply system including ringing voltage reset under low input voltage conditions
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United States of America Patent
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Jul 23, 1996
Grant Date -
N/A
app pub date -
Sep 21, 1994
filing date -
Sep 21, 1994
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A voltage detection circuit, in conjunction with a power supply system for ringing voltage generation in a remote telecommunications unit, monitors the operating voltage level of the remote unit and, when an undervoltage condition is detected, causes a ringing reference-signal generator to collapse the reference (AC) sine wave into a fixed (DC) state and holds it in this state for a preselected time, thereby substantially reducing the ringing-signal current load and allowing the operating voltage level to restore. The features of the invention allow for continued processing of calls in progress and for incoming call completion during an undervoltage condition. The increased reliability and integrity of the power supply system allows for extended power supply feeder distance to the remote telecommunications unit.
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