DC/DC/AC power supply for a subscriber interphase unit
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United States of America Patent
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Jun 14, 1994
Issued Date -
N/A
app pub date -
May 17, 1993
filing date -
Mar 25, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A DC to DC switch mode power supply for a service subscriber interface unit of a fiber optic network includes a source of DC primary power, a main DC to DC switched mode power supply connected to the source of DC primary power and including switching circuitry and rectifier circuitry for supplying DC operating power to the service subscriber interface unit including central office battery power to at least one subscriber loop connected thereto, and a ringing voltage DC to AC switched mode generator connected to the source of DC primary power and including switching circuitry and synchronous rectification circuitry for generating ringing ringing voltage approximating a sine wave supplied as a reference to the synchronous rectification circuitry. A Johnson counter and resistor capacitor network is preferably employed to convert a reference ringing square wave into a sine wave.
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