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Hybrid frequency-phase-shift modulation with natural synchronous rectification for CLLC converters
File(s)
Author(s)
LIU, Chengwei
Chen, Huan
Wang, Leheng
Zhang, Kai
Kai, Sun
Type
Journal Article
Abstract
Synchronous rectification (SR) is an effective method to improve the efficiency of the CLLC resonant converter. However, existing SR methods typically rely on calculating specific SR angles based on pulse frequency modulation (PFM) or phase shift modulation (PSM), which do not overcome the intrinsic efficiency drawbacks of these modulations. To address this, this paper proposes a hybrid modulation that integrates switching frequency and phase shift to achieve natural SR and modulation optimization simultaneously. Rather than SR angle calculation, the proposed modulation combines the two control variables to synchronize the operation of the primary side switches and secondary side rectifiers (diodes or SR switches). This alignment enables natural SR by gating the secondary switches concurrently with the primary switches. Furthermore, the proposed modulation reduces the RMS value of inductor current and extends the ZVS range compared to PSM. In contrast to PFM, the proposed method operates at a lower switching frequency, thereby reducing switching losses. The modulation is achieved by a closed-loop control for switching frequency and a precomputed fitting curve for phase shift. A series of experimental results have verified the effectiveness of the proposed modulation.
Date Issued
2026-03-16
Date Acceptance
2026-03-09
Citation
IEEE Journal of Emerging and Selected Topics in Power Electronics, 2026, pp.1-11
URI
DOI
ISSN
2168-6777
Publisher
Institute of Electrical and Electronics Engineers
Start Page
1
End Page
11
Journal / Book Title
IEEE Journal of Emerging and Selected Topics in Power Electronics
Copyright Statement
© 2026 IEEE. All rights reserved. This is the author’s accepted manuscript made available under a CC-BY licence in accordance with Imperial’s Research Publications Open Access policy (www.imperial.ac.uk/oa-policy)
License URL
Publication Status
Published online
Date Publish Online
2026-03-16