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- Title
LLC resonant converter utilizing a step‐gap transformer structure for holdup time improvement.
- Authors
Lin, Jing‐Yuan; Lee, Sih‐Yi; Yueh, Hsuan‐Yu
- Abstract
Summary: This letter presents a current‐controlled variable magnetizing inductance of transformer for further improving the holdup time on half‐bridge LLC converter. When the input voltage is failed, the magnetizing inductance of transformer can be decreased sharply; therefore, the LLC converter holdup time can be improved without adding additional auxiliary circuit. The mathematic model between magnetizing inductance and step‐gap structure of transformer is proposed, and the benefit effects using this step‐gap structure of transformer have been verified in this letter. Finally, a 180‐W, LLC converter utilizing step‐gap structure of transformer has been achieved, and detailed analysis and design of the proposed step‐gap structure are described. This letter presents a current‐controlled variable magnetizing inductance of transformer for further improving the holdup time on half‐bridge LLC converter. When the input voltage is failed, the magnetizing inductance of transformer can be decreased sharply; therefore, the LLC converter holdup time can be improved without adding additional auxiliary circuit. The mathematic model between magnetizing inductance and step‐gap structure of transformer is proposed, and the benefit effects using this step‐gap structure of transformer have been verified in this letter. Finally, a 180‐W, LLC converter utilizing step‐gap structure of transformer has been achieved, and detailed analysis and design of the proposed step‐gap structure are described
- Subjects
ELECTRIC transformers; ELECTRIC potential; ELECTRIC power conversion; ELECTRIC circuits; ELECTRIC inductance
- Publication
International Journal of Circuit Theory & Applications, 2018, Vol 46, Issue 12, p2545
- ISSN
0098-9886
- Publication type
Article
- DOI
10.1002/cta.2562