Review of Current Balance Mechanism in Multiphase LLC Resonant Converters

Mostafa Noah, Jun Imaoka, Yuki Ishikura, Kazuhiro Umetani, Masayoshi Yamamoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

In multi-phase power conversion circuits, achieving an equalized current sharing between the paralleled modules is a challenge. Especially, in the LLC resonant converter topology, where the voltage gain is very sensitive to a minor change in the resonant tank parameters. In practical applications, the resonant tank parameters are never exactly identical among the phases, leading to unbalanced current sharing between the paralleled modules. This paper reviews the state of the art of current balance mechanisms proposed previously in the literature and revisits a newly proposed method to improve the current balance, which relies on a single balancing transformer connected in series with the paralleled resonant tanks. A comparison between the proposed method and connecting the three transformers in star is conducted. While evaluating the current balancing methods, the following sources of unbalance have been considered: a) resonant and magnetizing inductances b) resonant capacitors. c) on-resistances of the switching devices. d) propagation delay of the gate drivers.

Original languageEnglish
Title of host publicationProceedings - 2018 IEEE 27th International Symposium on Industrial Electronics, ISIE 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1030-1036
Number of pages7
Volume2018-June
ISBN (Print)9781538637050
DOIs
Publication statusPublished - Aug 10 2018
Event27th IEEE International Symposium on Industrial Electronics, ISIE 2018 - Cairns, Australia
Duration: Jun 13 2018Jun 15 2018

Other

Other27th IEEE International Symposium on Industrial Electronics, ISIE 2018
CountryAustralia
CityCairns
Period6/13/186/15/18

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering

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  • Cite this

    Noah, M., Imaoka, J., Ishikura, Y., Umetani, K., & Yamamoto, M. (2018). Review of Current Balance Mechanism in Multiphase LLC Resonant Converters. In Proceedings - 2018 IEEE 27th International Symposium on Industrial Electronics, ISIE 2018 (Vol. 2018-June, pp. 1030-1036). [8433827] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ISIE.2018.8433827