Design and Analysis of a New Evaluation Circuit for Capacitors Used in a High-Power Three-Phase Inverter

Kazunori Hasegawa, Ichiro Omura, Shin Ichi Nishizawa

    Research output: Contribution to journalArticlepeer-review

    21 Citations (Scopus)


    DC-link capacitors in power electronic converters are a major constraint on improvement of power density as well as reliability. Evaluation of the dc-link capacitors in terms of power loss, ageing, and failure rate will play an important role in design stages of the next-generation power converters. This paper proposes a new evaluation circuit for dc-link capacitors used in a high-power three-phase inverter, which is intended for testing power loss, failure rate, ageing, and so on. The evaluation circuit produces a practical ripple current waveform and a dc bias voltage into a capacitor under test, in which the ripple current is equivalent to that generated by the three-phase inverter on the dc link. The evaluation circuit employs a full-scale current-rating and downscaled voltage-rating inverter for producing the ripple current, so that the power rating of the evaluation circuit is much smaller than that of a full-scale current-rating and full-scale voltage-rating inverter. Theoretical analysis and simulated results verify the effectiveness of new evaluation circuit.

    Original languageEnglish
    Article number7362196
    Pages (from-to)2679-2687
    Number of pages9
    JournalIEEE Transactions on Industrial Electronics
    Issue number5
    Publication statusPublished - May 2016

    All Science Journal Classification (ASJC) codes

    • Control and Systems Engineering
    • Electrical and Electronic Engineering


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