Four quadrant flyback converter, method of operation thereof and

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

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363 25, 363 26, 363133, 363 41, H02M3/335;1/12;7/538

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active

059034483

ABSTRACT:
A four quadrant flyback converter, employable as part of a ringing signal generator, includes: (1) a transformer having first and second primary windings of opposite polarity and a secondary winding, (2) first and second switches that alternatively couple the first and second windings, respectively, to a source of DC input power and (3) a bidirectional switch coupling the secondary winding to an output of the converter, the first, second and bidirectional switches switchable to provide a continuous waveform at the output.

REFERENCES:
patent: 4559590 (1985-12-01), Davidson
patent: 4823249 (1989-04-01), Garcia, II
patent: 4866587 (1989-09-01), Wadlington
patent: 4897522 (1990-01-01), Bilczo et al.
patent: 5177675 (1993-01-01), Archer
patent: 5349157 (1994-09-01), Blankenship
patent: 5646832 (1997-07-01), Pulhamus, Jr. et al.
patent: 5654881 (1997-08-01), Albrecht et al.
IEEE Publication entitled "Four Quadrant Amplifier Based on the Flyback Topology" by Jim Walker: 1995; pp. 947-951.
Technical Specification entitled "UCC3750 Source Ringer Controller" by Unitrode Integrated Circuits Corporation 1996: 13 pages.

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