Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1995-05-26
1998-03-17
Hecker, Stuart N.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 24, H02M 3335
Patent
active
057294445
ABSTRACT:
A DC-DC converter includes a transformer with two oppositely-wound primary windings, one on each side of a center tap, and at least one secondary winding connected to a load having a given capacitance. A reference voltage source is connected to the center tap of the transformer via an inductor so that the transformer is driven by a current source. Two switching devices are each connected in the return path of the reference voltage and in series with a respective primary winding. A control unit alternately and periodically connects the return path for the reference voltage to one or other of the primary windings. The control unit includes an oscillator generating squarewave signals has two complementary outputs connected directly to a control terminal of a respective switching device. The frequency of the oscillator is substantially equal to the resonant frequency of a circuit comprising the secondary inductance of the transformer and the capacitance of the load.
REFERENCES:
patent: 3843919 (1974-10-01), Yamamura et al.
patent: 3938024 (1976-02-01), Clarke
patent: 4025863 (1977-05-01), Higuchi et al.
patent: 4301499 (1981-11-01), Levinson
patent: 4443840 (1984-04-01), Geissler et al.
patent: 4885675 (1989-12-01), Henze et al.
patent: 4959765 (1990-09-01), Weinberg
Pesc'92 Record, 29 Jun. 1992, Toledo, Spain--pp. 1001-1010, XP000369120 Weinberg "A Novel Lossless Resonant MOSFET Driver".
Agence Spatiale Europeenne
Hecker Stuart N.
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