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ZVS Auxiliary Circuit for a 10 kW Unregulated LLC Full-Bridge Operating at Resonant Frequency for Aircraft Application

Author

Listed:
  • Yann E. Bouvier

    (Centro de Electrónica Industrial, Universidad Politécnica de Madrid, Madrid 28006, Spain)

  • Diego Serrano

    (Centro de Electrónica Industrial, Universidad Politécnica de Madrid, Madrid 28006, Spain)

  • Uroš Borović

    (Centro de Electrónica Industrial, Universidad Politécnica de Madrid, Madrid 28006, Spain)

  • Gonzalo Moreno

    (Indra Sistemas, S.A., Indra Sistemas, Calle de Joaquín Rodrigo, 11, 28300 Aranjuez, Madrid, Spain)

  • Miroslav Vasić

    (Centro de Electrónica Industrial, Universidad Politécnica de Madrid, Madrid 28006, Spain)

  • Jesús A. Oliver

    (Centro de Electrónica Industrial, Universidad Politécnica de Madrid, Madrid 28006, Spain)

  • Pedro Alou

    (Centro de Electrónica Industrial, Universidad Politécnica de Madrid, Madrid 28006, Spain)

  • José A. Cobos

    (Centro de Electrónica Industrial, Universidad Politécnica de Madrid, Madrid 28006, Spain)

  • Jorge Carmena

    (Indra Sistemas, S.A., Indra Sistemas, Calle de Joaquín Rodrigo, 11, 28300 Aranjuez, Madrid, Spain)

Abstract

In modern aircraft designs, following the More Electrical Aircraft (MEA) philosophy, there is a growing need for new high-power converters. In this context, innovative solutions to provide high efficiency and power density are required. This paper proposes an unregulated LLC full-bridge operating at resonant frequency to obtain a constant gain at all loads. The first harmonic approximation (FHA) model is not accurate enough to estimate the voltage gain in converters with high parasitic resistance. A modified FHA model is proposed for voltage gain analysis, and time-based models are used to calculate the instantaneous current required for the ZVS transition analysis. A method using charge instead of current is proposed and used for this ZVS analysis. Using this method, an auxiliary circuit is proposed to achieve complete ZVS within the whole load range, avoiding a gapped transformer design and increasing the efficiency and power density. A 28 Vdc output voltage prototype, with 10 kW peak output power, has been developed to validate the theoretical analysis and the proposed auxiliary circuit. The maximum efficiency (96.3%) is achieved at the nominal power of 5 kW.

Suggested Citation

  • Yann E. Bouvier & Diego Serrano & Uroš Borović & Gonzalo Moreno & Miroslav Vasić & Jesús A. Oliver & Pedro Alou & José A. Cobos & Jorge Carmena, 2019. "ZVS Auxiliary Circuit for a 10 kW Unregulated LLC Full-Bridge Operating at Resonant Frequency for Aircraft Application," Energies, MDPI, vol. 12(10), pages 1-20, May.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:10:p:1850-:d:231440
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    Citations

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    Cited by:

    1. Marek Pastor & Milan Lacko & Jaroslav Dudrik & Adrian Marcinek, 2023. "Soft-Switching Full-Bridge DC-DC Converter with Energy Recovery Capacitor Snubber," Energies, MDPI, vol. 16(4), pages 1-18, February.
    2. Piotr Dworakowski & Andrzej Wilk & Michal Michna & Bruno Lefebvre & Fabien Sixdenier & Michel Mermet-Guyennet, 2020. "Effective Permeability of Multi Air Gap Ferrite Core 3-Phase Medium Frequency Transformer in Isolated DC-DC Converters," Energies, MDPI, vol. 13(6), pages 1-21, March.
    3. Kornel Wolski & Piotr Grzejszczak & Marek Szymczak & Roman Barlik, 2021. "Closed-Form Formulas for Automated Design of SiC-Based Phase-Shifted Full Bridge Converters in Charger Applications," Energies, MDPI, vol. 14(17), pages 1-25, August.

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