Active decoupling and power management circuit for line-powered ringing generator
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United States of America Patent
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Feb 10, 2004
Grant Date -
N/A
app pub date -
Nov 19, 1999
filing date -
Nov 19, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A ringing voltage power management circuit is configured to extract an isolated high-value intermediate voltage from a central office powered digital subscriber line through a current limiting circuit, and to charge a storage capacitor that serves as an energy reservoir for the ring generator of a subscriber line circuit. The storage capacitor and the current limiting circuit isolate the peak power drawn by the ringing load from the telephone line and translate the ringing signal's (20 Hz) ripple to the sub-Hz oscillations of the ringing cadence.
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