Thermal management of compact nanocrystalline inductors for power dense converters

Yiren Wang, Gerardo Calderon-Lopez, Andrew Forsyth

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Enhanced thermal management continues to be the key to the miniaturisation of high-frequency magnetic components and to increased converter power densities. Thermal finite element analysis has been used to examine the use of high-thermal-conductivity ceramic heat spreaders in the potted structure of a nanocrystalline-cored DC inductor to mitigate the local temperature rise due to the concentrated gap losses. The thermal performance of different heat spreader and potting materials has also been investigated. The heat spreader technique is validated by experimental results on two 350 A, 60 kHz DC inductors, showing a hot spot temperature reduction of 20 °C with embedded aluminium nitride heat spreaders, which may allow a smaller core to be used. By using the heat spreaders about 30 % weight reduction is illustrated for a higher frequency DC inductor design (300 A, 150 kHz). Furthermore, the impact of the potting compound's thermal conductivity is studied, revealing that a size reduction of up to 50% is possible with the heat spreaders in addition to an improved potting material.

    Original languageEnglish
    Title of host publicationAPEC 2018 - 33rd Annual IEEE Applied Power Electronics Conference and Exposition
    Subtitle of host publicationCES/IEEE 5th International Power Electronics and Motion Control Conference
    PublisherIEEE
    Pages2696-2703
    Number of pages8
    Volume2018-March
    ISBN (Electronic)9781538611807
    ISBN (Print)1424404487, 9781424404483
    DOIs
    Publication statusPublished - 18 Apr 2018
    Event33rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2018 - San Antonio, United States
    Duration: 4 Mar 20188 Mar 2018

    Conference

    Conference33rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2018
    Country/TerritoryUnited States
    CitySan Antonio
    Period4/03/188/03/18

    Keywords

    • DC inductor
    • Heat spreader
    • Nanocrystalline core
    • Thermal management

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