An EMI-less full-bridge inverter for high speed SiC switching devices

Jun Sakata, Masao Taguchi, Shoichi Sasaki, Tadahiro Kuroda, Keiji Toda

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

    2 Citations (Scopus)

    Abstract

    To improve the efficiency of inverters used in hybrid cars and electric vehicles (EVs), SiC-MOSFET transistors are used to minimize the switching losses by high-speed switching. However, as the speed increases, surges and ringing occur in the output voltage, and these can cause electromagnetic interference (EMI). In this paper, we study how this issue can be addressed by using a full bridge inverter to suppress common-mode voltages and cancel ringings currents with opposite phase that are generated when driving at high speed. In most cases, one should assume that transistors that are driven simultaneously have slightly different I-V characteristics. Due to this variation, the ringing cannot be completely canceled, resulting in a common-mode voltage. Although this is liable to cause EMI, we also found that if the two transistors are operated close to the point where the maximum switching current occurs, the common-mode voltage fluctuation can be sufficiently suppressed at any current. We analyzed these characteristics in a simulation using a SiC-MOSFET transistor model, and experimentally verified its behavior in a prototype inverter.

    Original languageEnglish
    Title of host publicationAPEC 2018 - 33rd Annual IEEE Applied Power Electronics Conference and Exposition
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages2570-2576
    Number of pages7
    Volume2018-March
    ISBN (Electronic)9781538611807
    DOIs
    Publication statusPublished - 2018 Apr 18
    Event33rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2018 - San Antonio, United States
    Duration: 2018 Mar 42018 Mar 8

    Other

    Other33rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2018
    CountryUnited States
    CitySan Antonio
    Period18/3/418/3/8

    Keywords

    • Common-mode
    • EMI
    • Full-bridge
    • Inverter
    • SiC

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

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  • Cite this

    Sakata, J., Taguchi, M., Sasaki, S., Kuroda, T., & Toda, K. (2018). An EMI-less full-bridge inverter for high speed SiC switching devices. In APEC 2018 - 33rd Annual IEEE Applied Power Electronics Conference and Exposition (Vol. 2018-March, pp. 2570-2576). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/APEC.2018.8341379