Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1991-01-07
1992-07-21
Stephan, Steven L.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363132, H02M 3335
Patent
active
051328887
ABSTRACT:
A DC to DC power converter is implemented which includes an input switching circuit, an input capacitor, a transformer and an output rectifying switching circuit coupled to the transformer. The input switching circuit consists of a minimum of four transistors which are operated in a timed relationship such that bi-directional currents are developed in both primary windings. The output rectifying switching circuit is operated with switching transistors that provide zero-voltage resonant transition (ZVRT) switching. Timing relationships between the input signals control the ZVRT with switching of the transistors. Bidirectional currents in the primary windings of the single transformer element permit a reduction in volume of the magnetic element and the coils of the transformer for a given level of output power. Overall, converter volume for a given output power is thereby sufficiently reduced to allow a power converter to be mounted on a circuit board, which enables a practical embodiment of a distributed power processing system.
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Lo David S.
Mulkern Joseph H.
Bowen Glenn W.
Starr Mark T.
Stephan Steven L.
Sterrett Jeffrey
Unisys Corporation
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