A Passive Current Sharing Method With Common Inductor Multiphase LLC Resonant Converter

In this paper, a new common inductor current sharing method is proposed for a multiphase LLC resonant converter for high-power applications. Automatic current sharing is achieved by using a common resonant inductor connecting the resonant inductors in each LLC phase in parallel. The current sharing...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2017-09, Vol.32 (9), p.6994-7010
Main Authors: Hongliang Wang, Yang Chen, Yan-Fei Liu, Afsharian, Jahangir, Zhihua Yang
Format: Article
Language:English
Subjects:
Capacitors
Circuits
Current sharing
Current sharing error
Full load
Inductance
Inductors
Magnetic resonance
Multiphase
multiphase <italic xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">LLC
resonant converter
Stress
Switches
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Summary:In this paper, a new common inductor current sharing method is proposed for a multiphase LLC resonant converter for high-power applications. Automatic current sharing is achieved by using a common resonant inductor connecting the resonant inductors in each LLC phase in parallel. The current sharing performance of the proposed method is evaluated under first harmonic approximation (FHA) assumption. The proposed method can automatically share the primary resonant current and the load current for all phases without any additional circuit and control strategy. A 600-W two-phase LLC converter prototype based on the proposed method is built to verify the feasibility. Excellent current sharing performance (less than 0.5% current sharing error at full load) has been achieved.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2016.2626312