Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1983-06-29
1986-03-25
Wong, Peter S.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 26, 363 97, H02M 545
Patent
active
045787441
ABSTRACT:
The a. c. power converter forms an electronic alternating voltage transformer for transforming an essentially sinousoidal input alternating voltage of a predetermined frequency, e.g. power line frequency, and a first voltage into a second voltage of the same frequency and essentially the same wave shape. A chopper circuit (52) is coupled between input terminals (50a, 50b) and the primary winding of a transformer (54), dimensioned for the operating frequency of the chopper, e.g. 50-150 kHz. A secondary of the transformer is coupled to a rectifier circuit (60) having two output connections, on each of which one of two unipolar voltages of opposite polarities appear. The output terminals of the rectifier circuit (60) are each coupled through a low-pass filter (73a, 73b) to alternately conductive electronic switches (64a, 64b) and to a first (62a) of two output terminals. The second output terminal (66b) is coupled to a common terminal, e.g. a transformer center tap (56) of the rectifier circuit. A control circuit (70) alternately controls opening and closing of the electronic switches, in synchronism with the input alternating voltage, so that alternating portions of the unipolar voltages which correspond to successive half-waves of the input alternating voltages are pased to the output terminals (66a, 66b) through the alternatingly conductive electronic switches (64a, 64b).
REFERENCES:
patent: 3517300 (1970-06-01), McMurray
patent: 3970916 (1976-07-01), Kienscherf
patent: 4079307 (1978-03-01), Hazumi et al.
patent: 4353112 (1982-10-01), Rietveld et al.
Jones Judson H.
Wong Peter S.
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