DC/DC/AC power supply for a subscriber interphase unit

Details DC/DC/AC power supply for a subscriber interphase unit DC/DC/AC power supply for a subscriber interphase unit

1993-05-17

1994-06-14

Beha, Jr., William H.

Electric power conversion systems

Cascaded or combined, diverse conversions in which the...

Current and frequency

363127, 363163, 379418, H02M 748

Patent

active

053215966

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.

REFERENCES:
patent: 4213173 (1980-07-01), Link et al.
patent: 4878163 (1989-10-01), Yamato et al.
patent: 5103387 (1992-04-01), Rosenbaum et al.
EPE '89 3.sup.rd Eur. Conf. on Power Electr. and App's, pp. 1427-1431, 1989 Aachen Germany.
Intelec 12.sup.th Int. TeleComm. Energy Conf. 21, pp. 35-40, Orlando, Fla. USA, Oct. 1990.
Review of the Electrical Comm. Labs, vol. 22, No. 9-10, pp. 818826, Sep. 1974.

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