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Designing dual-transformer resonant converter with inductance optimization to expand soft switching range

https://doi.org/10.35266/1999-7604-2026-1-3

Abstract

The paper analyses modern topologies of high-frequency isolated direct current (DC) converters, including phase-controlled bridge circuits and resonant LLC converters. The study defines the following key disadvantages of the aforementioned converters: significant circulating power, narrow soft switching range, and increased switching losses in a number of modes. The scope of the research encompasses a dual-transformer resonant topology, which provides advantages in distributing energy flows and suppressing peak currents. Simulation of the converter's steady-state operation using the fundamental approximation has shown that the output power can be substantively manipulated by means of a single characteristic, i.e. phase-shift of the half-bridges control signals. The authors study the transformer ratio's influence on the limit conditions of zero voltage switching (ZVS). The article establishes that the optimal ratio of transformer inductances significantly expands the load range at which soft switching of all power switches remains unchanged up to the open-circuit. The work develops a converter design method that contains an algorithm for optimizing the power contour characteristics to minimize conduction losses and expand the ZVS range. The technique consists in a sequential selection of the leakage inductance, transformer ratio, magnetic core shape and number of windings' turns, ensuring compliance with the set requirements in terms of efficiency, weight and size. The experiment confirms high energy efficiency of the converter (over 96%) in a wide load range and stable maintenance of the soft switching mode.

About the Authors

A. A. Pirogov
Voronezh State Technical University, Voronezh
Russian Federation

Candidate of Sciences (Engineering), Docent


M. V. Khoroshailova
Voronezh State Technical University, Voronezh
Russian Federation

Candidate of Sciences (Engineering), Docent


P. V. Zobov
Military Educational and Scientific Centre of the Air Force N. E. Zhukovsky and Y. A. Gagarin Air Force Academy, Voronezh
Russian Federation

Lecturer


E. V. Syomka
Military Educational and Scientific Centre of the Air Force N. E. Zhukovsky and Y. A. Gagarin Air Force Academy, Voronezh
Russian Federation

Candidate of Sciences (Physics and Mathematics), Docent


References

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3. Пирогов А. А., Хорошайлова М. В., Назаренко Н. Г. и др. Анализ обеспечения целостности сигнала на печатной плате при проектировании высокопроизводительных вычислительных устройств. Вестник кибернетики. 2025. T. 24, № 2. С. 47–57. https://doi.org/10.35266/1999-7604-2025-2-6.

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5. Wei Y., Luo Q., Mantooth A. Hybrid control strategy for LLC converter with reduced switching frequency range and circulating current for hold-up time operation // IEEE Transactions Power Electronics. 2021. Vol. 36, no. 8. P. 8600–8606.

6. Shi Z., Tang Y., Guo Y. et al. Optimal design method of LLC half-bridge resonant converter considering backflow power analysis // IEEE Transactions on Industrial Electronics. 2022. Vol. 69, no. 4. P. 3599–3608.

7. Lin J.-Y., Yueh H.-Y., Lin Y.-F. et al. Variable-frequency and phase-shift with synchronous rectification advance on-time hybrid control of LLC resonant converter for electric vehicles charger // IEEE Journal of Emerging and Selected Topics in Industrial Electronics. 2023. Vol. 4, no. 1. P. 348–356.


Review

For citations:

Pirogov A.A., Khoroshailova M.V., Zobov P.V., Syomka E.V. Designing dual-transformer resonant converter with inductance optimization to expand soft switching range. Proceedings in Cybernetics. 2026;25(1):27-38. (In Russ.) https://doi.org/10.35266/1999-7604-2026-1-3

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ISSN 1999-7604 (Online)

628412, Khanty-Mansi Autonomous Okrug – Yugra, Surgut, Lenina pr. 1

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