Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1985-02-11
1987-09-22
Salce, Patrick R.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 40, 363 71, 363 98, H02M 3335
Patent
active
046959335
ABSTRACT:
Prior DC-DC converters of the resonant type often require the use of parallel-connected power switches to provide adequate current levels and further require large input and output filters. However, parallel operation of switching devices encounters the problem of current sharing and large filters are disadvantageous from a size and weight standpoint. Such problems are overcome by the DC-DC converter of the present invention which includes a plurality of subconverters having outputs which are combined to produce the output power. Each subconverter includes an inverter and a rectifier for developing a full wave rectified output having a ripple component therein. The subconverters are operated so that a phase displacement of 2.pi./N electrical degrees exists in the output current from one subconverter relative to the output current from other subconverters. The combined output therefore comprises a ripple component superimposed on a DC level, with the ripple component having a smaller amplitude and a greater frequency than the ripple component supplied by prior converters providing the same DC output level. The reduced ripple amplitude and increased frequency result in a reduction in size of the input and output filters. Further, since each subconverter handles only a portion of the total output power, parallel-connected switching devices need not be used.
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Dhyanchand P. John
Nguyen Vietson M.
Thollot Pierre
Salce Patrick R.
Sterrett Jeffrey
Sundstrand Corporation
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