An Optimized Light-Load Efficiency Scheme for LLC Converters Based on Variable Ratio Transformer
ID：6
Submission ID：11 View Protection：ATTENDEE
Updated Time：2023-11-20 13:45:31 Hits：221
Oral Presentation
Start Time：2023-12-10 09:15 （Asia/Shanghai）
Duration：15min
Session：[S9] Transformer technology and applications » [S9] Transformer technology and applications
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Abstract
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.
Keywords
voltage regulator module (VRM), LLC resonant converter, Circuit reconfiguration, light-load efficiency promotion.
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