Design consideration of low-profile LLC resonant converter for reducing temperature of the transformer

Sihun Yang, Seiya Abe, Masahito Shoyama

Research output: Contribution to journalArticle

Abstract

This paper presents the design consideration of a low-profile LLC resonant converter using two flat transformers. The trend toward high power density, high efficiency, and low profile in power supplies has exposed a number of limitations in the use of magnetic component structures. The LLC resonant converter can be operated at a high switching frequency with high efficiency because the switching loss is reduced by soft-switching. However, flat transformer loss causes problems at a high switching frequency. As a result, temperature of flat transformers becomes high. Therefore, it is necessary to reduce the transformer temperature by analyzing the loss. In this proposed converter, flat transformer is integrated into advanced power conversion application systems. Low-profile power module of profile of about 14mm is achieved. Temperature inside of transformer repressed to 66.5 and an overall efficiency of about 96.5% was obtained.

Original languageEnglish
Pages (from-to)49-54
Number of pages6
JournalResearch Reports on Information Science and Electrical Engineering of Kyushu University
Volume17
Issue number2
Publication statusPublished - 2012
Externally publishedYes

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Switching frequency
Temperature

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Computer Science(all)

Cite this

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abstract = "This paper presents the design consideration of a low-profile LLC resonant converter using two flat transformers. The trend toward high power density, high efficiency, and low profile in power supplies has exposed a number of limitations in the use of magnetic component structures. The LLC resonant converter can be operated at a high switching frequency with high efficiency because the switching loss is reduced by soft-switching. However, flat transformer loss causes problems at a high switching frequency. As a result, temperature of flat transformers becomes high. Therefore, it is necessary to reduce the transformer temperature by analyzing the loss. In this proposed converter, flat transformer is integrated into advanced power conversion application systems. Low-profile power module of profile of about 14mm is achieved. Temperature inside of transformer repressed to 66.5 and an overall efficiency of about 96.5{\%} was obtained.",
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