Ripple current analysis of an electrolytic capacitor in power factor correctors

Masahito Shoyama, Toshiaki Kurachi, Tamotsu Ninomiya

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


A large electrolytic capacitor usually is employed at the output terminal of power factor correction circuits to suppress the high-frequency switching ripple voltage as well as the low-frequency ripple voltage. Due to the equivalent series resistance of the electrolytic capacitor, the capacitor current causes power loss which increases its temperature and may shorten its life. Thus, it is important to estimate accurately the effective value of the capacitor current for a proper choice of the capacitor and to maintain the expected life of the capacitor. This paper presents a detailed analysis of the ripple current of an electrolytic capacitor in the boost-type power factor correction circuit. The ripple current is divided into two components, namely, the low-frequency and the high-frequency components. The root-meansquare value of the capacitor current is divided for both frequency components. The analytical results are confirmed by experiments.

Original languageEnglish
Pages (from-to)93-101
Number of pages9
JournalElectronics and Communications in Japan, Part II: Electronics (English translation of Denshi Tsushin Gakkai Ronbunshi)
Issue number4
Publication statusPublished - Apr 1996

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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