A condition-monitoring method of DC-link capacitors used in a high-power three-phase PWM inverter with an evaluation circuit

Kazunori Hasegawa, Shin ichi Nishizawa, Ichiro Omura

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

This paper presents a condition-monitoring method of dc-link capacitors used in a high-power three-phase PWM inverter with an evaluation circuit intended for ageing tests. Although its power rating is 1/25 of the inverter, the evaluation circuit provides the equivalent ripple current waveform and dc-bias voltage to the high-power inverter. The monitoring method independently extracts the capacitance and ESR of the dc-link capacitor, where the fast Fourier transform is introduced to the ripple current waveform and the dc-link voltage of the evaluation circuit. Experimental results verify that the monitoring method obtains both the ESR and capacitance changes of a capacitor under test.

Original languageEnglish
Pages (from-to)480-487
Number of pages8
JournalIEEJ Journal of Industry Applications
Volume8
Issue number3
DOIs
Publication statusPublished - 2019

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Energy Engineering and Power Technology
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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