Bi-Directional High-Conversion-Ratio CLLC Resonant Converter with a New Synchronous Rectification Scheme for Low Conduction Loss

カテゴリ: 論文誌(論文単位)

グループ名: 【D】産業応用部門（英文）

発行日: 2020/09/01

タイトル(英語): Bi-Directional High-Conversion-Ratio CLLC Resonant Converter with a New Synchronous Rectification Scheme for Low Conduction Loss

著者名: Kai Sun (State Key Lab of Power Systems, Tsinghua University), Yucheng Gao (State Key Lab of Power Systems, Tsinghua University), Huan Chen (State Key Lab of Power Systems, Tsinghua University)

著者名(英語): Kai Sun (State Key Lab of Power Systems, Tsinghua University), Yucheng Gao (State Key Lab of Power Systems, Tsinghua University), Huan Chen (State Key Lab of Power Systems, Tsinghua University)

キーワード: CLLC resonant converter，phase shift，synchronous rectification，high-step-down

要約(英語): This paper proposes a new synchronous rectification (SR) scheme for frequency-modulated bi-directional CLLC resonant converters. By introducing a small-phase-shift between the two full-bridges and utilizing the switching transient, the proposed scheme effectively avoids the magnetizing current being provided from the low voltage side. This leads to considerable reduction in the conduction losses and current stress of the switches in a high-step-down design. Furthermore, the output voltage characteristic is analyzed using a novel mathematical model, which, comparing to the fundamental harmonic approximation method, can not only acquire a more accurate result of steady-state characteristic, but also calculate an accurate set of initial values for the passive components, which is crucial to determine the proper dead-time and phase-shift. Based on the new model, the boundaries of dead-time and phase-shift are discussed in detail. Finally, a prototype is built, and experiments are conducted to verify the principles of the proposed scheme.

本誌: IEEJ Journal of Industry Applications Vol.9 No.5 （2020）

本誌掲載ページ: 515-522 p

原稿種別: 論文／英語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejjia/9/5/9_515/_article/-char/ja/