A New Approach to High Efficincy in Isolated Boost Converters for High-Power Low-Voltage Fuel Cell Apllications

Morten Nymand, Michael A. E. Andersen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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    Abstract

    A new low-leakage-inductance low-resistance design approach to low-voltage high-power isolated boost converters is presented. Very low levels of parasitic circuit inductances are achieved by optimizing transformer design and circuit lay-out. Primary side voltage clamp circuits can be eliminated by the use of power MOSFETs fully rated for repetitive avalanche. Voltage rating of primary switches can now be reduced, significantly reducing switch on-state losses. Finally, silicon carbide rectifying diodes allow fast diode turn-off, further reducing losses. Test results from a 1.5 kW full-bridge boost converter verify theoretical analysis and demonstrate very high efficiency. Worst case efficiency, at minimum input voltage maximum power, is 96.8 percent and maximum efficiency reaches 98 percent.
    Original languageEnglish
    Title of host publication13th Power Electronics and Motion Control Conference
    PublisherIEEE
    Publication date2008
    Pages577
    ISBN (Print)978-1-4244-1742-1
    DOIs
    Publication statusPublished - 2008
    Event13th Power Electronics and Motion Control Conference - Poznań, Poland
    Duration: 1 Sept 20083 Sept 2008
    Conference number: 13
    http://www.epe-pemc2008.put.poznan.pl/home_news.php

    Conference

    Conference13th Power Electronics and Motion Control Conference
    Number13
    Country/TerritoryPoland
    CityPoznań
    Period01/09/200803/09/2008
    Internet address

    Keywords

    • Switched-mode power supply
    • Fuel cell system
    • Efficiency
    • Transformer
    • SiC-device

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