Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1997-04-01
1998-11-17
Berhane, Adolf
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 21, H02M 3335
Patent
active
058385525
ABSTRACT:
An asymmetrical power converter and a method of operation thereof. According to a first aspect of the present invention, the asymmetrical converter includes (1) first and second transformers having serially-coupled primary windings and differing turns ratios; (2) a first power switch coupled to a first end of the serially-coupled primary windings; (3) a second power switch coupled to a node between the serially-coupled primary windings and (4) a capacitive element coupled to a second end of the serially-coupled primary windings to maintain a volts-second balance thereacross during alternate switching cycles of the first and second power switches. According to a second aspect of the present invention, the asymmetrical converter includes (1) first and second transformers having serially-coupled primary windings and differing turns ratios; (2) a first power switch coupled to a first end of the serially-coupled primary windings; (3) a second power switch coupled to a second end of the serially-coupled primary windings and (4) a capacitive element coupled to a node between the serially-coupled primary windings to maintain a volts-second balance thereacross during alternate switching cycles of the first and second power switches.
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Article entitled "Asymmetrical Duty Cycle Permits Zero Switching Loss in PWM Circuits with No Conduction Loss Penalty" by Paul Imbertson and Ned Mohan, IEEE Transactions on Industry Applications, vol. 29, No. 1, Jan./Feb. 1991, pp. 121-125.
Article entitled "Soft-Switching DC/DC Converter with PWM Control" by R. Oruganti, P.C. Heng, J. Tan K.G., Liew INTELEC '93 Record, 1993, vol. 1, pp. 31-349.
Fraidlin Simon
Korotkov Sergey M.
Meleshin Valery I.
Miftakhutdinov Rais K.
Berhane Adolf
Lucent Technologies Inc
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