Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2006-06-06
2006-06-06
Berhane, Adolf (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S127000
Reexamination Certificate
active
07057906
ABSTRACT:
In a switching DC/DC converter using an insulating transformer Tr, a primary coil and a secondary coil of the transformer Tr, an input choke coil L1, and an output choke coil L3are wound around a common core and are formed into a single component. A primary circuit of the transformer Tr includes a switching device Q1connected in series with the primary coil, an input choke coil L1connected across the terminals of the primary coil, and a series circuit of a clamp capacitor C1and a switching device Q1′ which are connected across the terminals of the primary coil. A secondary circuit of the transformer Tr includes rectifying switching devices Q2and Q2′ connected to the secondary coil, the output choke coil L3, and an output smoothing capacitor C0. Further, a series circuit of the switching device Q1′ and the clamp capacitor C1may be connected across the terminals of the switching device Q1. The coils are arranged in directions of canceling DC fluxes generated by the coils, so that it is possible to greatly reduce the DC bias magnetization of the core, the volume of the core, and core losses, thereby achieving higher efficiency in the overall apparatus.
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Satoshi Tomioka, “Technique and Problem for Increasing Capacity of On-Board Power Supply,” Switching Power Supply System Symposium 2000, Japan Management Association, B4-2.
Kosuke Harada, “Measures for Higher Harmonics of Switching Power Supply,” first edition, Nikkan Kogyo Shimbun Ltd., Feb. 25, 1997, pp. 232-237.
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