Ringing signal supply

Details Ringing signal supply Ringing signal supply

1981-01-28

1982-07-27

Brigance, Gerald L.

Electric power conversion systems

Phase conversion without intermediate conversion to d.c.

By dynamoelectric machine converter

179 84R, 363 74, H04M 512

Patent

active

043419283

ABSTRACT:
A ringing signal supply, provided at a concentrator remote from a switching office, compares a fraction of its output with a low level reference ringing signal supplied from the switching office, and uses the comparison result to control a high voltage chopper which connects one of two d.c. supply voltages via a low pass filter to the output to produce the ringing signal at a desired frequency. A d.c.-d.c. forward converter produces the two d.c. supply voltages commonly for a plurality of ringing signal supplies whenever at least one of them is to produce a ringing signal.

REFERENCES:
patent: 3205424 (1965-09-01), Bates
patent: 3564394 (1971-02-01), Opal et al.
patent: 3970916 (1976-07-01), Kienscherf
patent: 4056693 (1977-11-01), Bosik et al.
patent: 4220826 (1980-09-01), Kiss
patent: 4244015 (1981-01-01), Beebe
patent: 4244016 (1981-01-01), Mitchell
patent: 4270028 (1981-05-01), Young
patent: 4282410 (1981-08-01), Gauthier et al.

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