Method of Designing a Four-Legged Transformer for Hybrid-Type DC-DC Converters

Conference: telescon(R) 2009 - Power Supply Quality and Efficiency - 4th International Telecommunication - Energy special conference
05/10/2009 - 05/13/2009 at Vienna, Austria

Proceedings: telescon(R) 2009 - Power Supply Quality and Efficiency

Pages: 6Language: englishTyp: PDF

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Unno, H.; Watanabe, H. (Shindengen Electric Mfg. Co., Ltd., 10-13 Minami-cho, Hanno-shi, Saitama 357-8585, Japan)
Unno, H.; Saotome, H.; Wakatsuki, Y. (Faculty of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan)

An integration of an output choke with a transformer has been attempted to miniaturization of forward converter. For example, a forward active clamp topology using a four-legged core has been proposed. This paper proposes a design methodology for this four-legged transformer. By means of an analysis, it was found that the magnetic flux in the leg, which acts as a output choke, has both dc and ac component. When the core of a transformer was designed using the proposed method, it was possible to reduce the footprint of the magnetic device in comparing with that of a conventional converter.