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An Optimized Light-Load Efficiency Scheme for LLC Converters Based on Variable Ratio Transformer
编号：6 访问权限：仅限参会人 更新：2023-11-20 13:45:31 浏览：524次 口头报告

报告开始：2023年12月10日 09:15（Asia/Shanghai）

报告时间：15min

所在会场：[S9] Transformer technology and applications [S9] Transformer technology and applications

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摘要
The utilization of a two-stage voltage regulator module (VRM) structure is becoming increasingly popular in server applications. To ensure high efficiency during the CPU sleep-mode, the LLC converter is the most popular choice for the first stage due to its efficient output. This paper proposes a transformer structure with a variable primary side winding, which can dynamically adjust the primary side ratio based on the load condition. Under light load conditions, the Large Turn Ratio mode is utilized to decrease the maximum magnetic flux in the magnetic core, thus reducing core losses and achieving higher efficiency. Simultaneously, for heavy load conditions, the mode with a reduced primary side turn ratio is employed to ensure optimal system efficiency. An efficient 48-12/9.6/5.3 V LLC DCX has been designed with a peak efficiency of up to 93.5%. Experiments conducted on VRMs show remarkable enhancements in light-load efficiency due to these modifications.

 
关键词
voltage regulator module (VRM), LLC resonant converter, Circuit reconfiguration, light-load efficiency promotion.
报告人
Tianqi Lv
School of Electrical Engineering； Southwest Jiaotong University

稿件作者
Tianqi Lv School of Electrical Engineering； Southwest Jiaotong University
Xinghong He Southwest Jiaotong University
Yundong Gu Southwest Jiaotong University
Ruikun Mai Southwest Jiaotong University
wei zhang Ltd.；State Grid Smart Grid Research Institute Co.
Leyu Shen Ltd.；State Grid Smart Grid Research Institute Co.
Yang Chen Southwest Jiaotong University
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重要日期

  • 会议日期

    12月08日

    2023

    至

    12月10日

    2023

  • 11月01日 2023

    初稿截稿日期

  • 12月10日 2023

    注册截止日期

主办单位
IEEE IAS
承办单位
Southwest Jiaotong University (SWJTU)
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