A Bidirectional GaN-Based CLLC Converter for Plug-In Electric Vehicles On-Board Chargers

Ahmed Morsi Ammar, Kawsar Ali, Daniel J. Rogers

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    Abstract

    This paper presents a bidirectional CLLC converter solution for the dc-dc stage in plug-in electric vehicle (PEV) onboard battery chargers. The proposed architecture allows the converter to operate at resonance for the bidirectional constantpower (CP) load range with a variable bus voltage, while frequency modulation is employed for the constant-current (CC) load range in the grid-to-vehicle (G2V) mode with a fixed bus voltage, resulting in a limited bus voltage range. This enables the use of 650-V Gallium nitride (GaN) devices for the primary and secondary sides’ switches. The design flow is presented and a 1-kW high-frequency prototype is implemented. GaN reverse conduction characteristics are investigated and employed for the high-frequency current rectification. The prototype operates with soft switching across the operational range, achieving an efficiency of up to 95.7%, with the resonant inductances integrated in the transformer.
    Original languageEnglish
    Title of host publicationProceedings of 46th Annual Conference of the IEEE Industrial Electronics Society
    Number of pages7
    PublisherIEEE
    Publication date2021
    ISBN (Print)978-1-7281-5415-2
    DOIs
    Publication statusPublished - 2021
    Event46th Annual Conference of the IEEE Industrial Electronics Society - Marina Bay Sands Expo and Convention Centre, Singapore, Singapore
    Duration: 18 Oct 202021 Oct 2020
    Conference number: 46
    https://ieeexplore.ieee.org/xpl/conhome/9254213/proceeding

    Conference

    Conference46th Annual Conference of the IEEE Industrial Electronics Society
    Number46
    LocationMarina Bay Sands Expo and Convention Centre
    Country/TerritorySingapore
    CitySingapore
    Period18/10/202021/10/2020
    Internet address

    Keywords

    • Electric vehicles
    • dc-dc converters
    • Resonant power conversion
    • Wide bandgap semiconductors
    • Bidirectional converters

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