A Novel Current Sharing Method by Grouping Transformer's Secondary Windings for a Multiphase LLC Resonant Converter

A novel current sharing method for a multiphase LLC resonant converter is proposed in this article. Without additional components or control strategies, the proposed method can achieve good current sharing performance even with 10% tolerance of the resonant parameters. Besides, the proposed method i...

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Bibliographic Details
Published inIEEE transactions on power electronics Vol. 35; no. 5; pp. 4877 - 4890
Main Authors Yang, Yugang, Yao, Junyou, Li, Heng, Zhao, Jinsheng
Format Journal Article
LanguageEnglish
Published New York IEEE 01.05.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Coils (windings)
Control systems
Converters
Current sharing
Current sharing method
grouping secondary windings
Inductors
Mathematical model
Multiphase
multiphase LLC resonant converter
Rectifiers
Resonant converters
resonant transformer
Stress
Transformers
Windings
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Summary:A novel current sharing method for a multiphase LLC resonant converter is proposed in this article. Without additional components or control strategies, the proposed method can achieve good current sharing performance even with 10% tolerance of the resonant parameters. Besides, the proposed method is very simple; only the secondary windings of the transformers need to be grouped. This method does not affect the efficiency and load transient characteristics of the LLC resonant converter. The excellent current sharing capability of the proposed method is demonstrated via theoretical analysis under first harmonic approximation assumption and powersim simulation. The experimental results of a 960-W two-phase LLC resonant converter prototype are provided to verify the effectiveness of the proposed method.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2019.2944835