Resonant Full-Bridge Synchronous Rectifier Utilizing 15 V GaN Transistors for Wireless Power Transfer Applications Following AirFuel Standard Operating at 6.78 MHz

Christopher Have Kiaerskou Jensen, Frederik Monrad Spliid, Jens Christian Hertel, Yasser Nour, Tiberiu-Gabriel Zsurzsan, Arnold Knott

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    Abstract

    Connectivity in smart devices is increasingly realized by wireless connections. The remaining reason for using connectors at all is for charging the internal battery, for which wireless power transfer is an alternative. Two industry standards, AirFuel and Qi, exist to support compatibility between devices. This work is focusing on the AirFuel standard, as it is operating at a higher frequency (6.78 MHz), than the Qi standard, and therefore allows smaller passive components, including the coupling coils. Whereas gallium-nitride (GaN) devices are being widely used on the transmitter (Tx) side, this work uses low voltage GaN transistors on the receiver (Rx) side to allow synchronous rectification and soft switching, thereby achieving high efficiency. After analyzing adequate Class-DE rectifier topologies, a ClassDE full-bridge 5 W rectifier using 15 V GaN transistors are designed and implemented. The experimental results show an efficiency above 80 % over a wide operating range and a peak efficiency of 89 %, at an arbitrary alignment of Tx and Rx coils with 3 cm distance between them.
    Original languageEnglish
    Title of host publicationProceedings of 2018 IEEE Applied Power Electronics Conference and Exposition
    Number of pages7
    PublisherIEEE
    Publication date2018
    Pages3131-3137
    DOIs
    Publication statusPublished - 2018
    Event2018 IEEE Applied Power Electronics Conference and Exposition - Henry B. Gonzalez Convention Center, San Antonio, United States
    Duration: 4 Mar 20188 Mar 2018
    https://ieeexplore.ieee.org/xpl/conhome/8336027/proceeding

    Conference

    Conference2018 IEEE Applied Power Electronics Conference and Exposition
    LocationHenry B. Gonzalez Convention Center
    Country/TerritoryUnited States
    CitySan Antonio
    Period04/03/201808/03/2018
    Internet address

    Keywords

    • Wireless power transfer
    • AirFuel
    • Synchronous rectification
    • Resonant circuit
    • soft-switching
    • GaN devices

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