Highly Efficient EV Battery Charger Using Fractional Charging Concept with SiC Devices

Tore Kanstad, Morten Birkerod Lillholm, Zhe Zhang

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    Abstract

    This paper describes the implementation of the fractional power conversion concept for use in an on-board charger for Electric Vehicles (EV). High gain step up topologies are required and an efficiency analysis of the full bridge boost converter is made. A comparison of many power devices including Si, GAN and SiC devices concludes that SiC devices are well suited for this application. Using loss equations and battery charging characteristics the converter is optimized for low loss in a full battery charge cycle. Switching-average methods model the small signal characteristics and a PI controller is implemented. The fractional charging configuration results in a very high current gain. A 100 kHz prototype was tested on a 300 V EV battery, achieving a converter efficiency of 97.6%. For a 400 V battery the charger can charge 4 kW at more than 98% efficiency. The power density of the charger is 3.6 kW/L.
    Original languageEnglish
    Title of host publicationProceedings of 34th annual IEEE Applied Power Electronics Conference and Exposition
    Number of pages8
    PublisherIEEE
    Publication date2019
    ISBN (Print)9781538683309
    DOIs
    Publication statusPublished - 2019
    Event2019 IEEE Applied Power Electronics Conference and Exposition - Anaheim convention center, Anaheim, United States
    Duration: 17 Mar 201921 Mar 2019
    https://ieeexplore.ieee.org/xpl/conhome/8716496/proceeding

    Conference

    Conference2019 IEEE Applied Power Electronics Conference and Exposition
    LocationAnaheim convention center
    Country/TerritoryUnited States
    CityAnaheim
    Period17/03/201921/03/2019
    Internet address

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