An improved topology of SEPIC converter with reduced output voltage ripple

Mustafa A. Al-Saffar, Esam H. Ismail, Ahmad J. Sabzali, Abbas A. Fardoun

Research output: Contribution to journalArticlepeer-review

69 Citations (Scopus)


An improved version of a single-ended primary inductor converter (SEPIC) is presented. The converter consists of a conventional SEPIC converter plus an additional high-frequency transformer and diode to maintain a freewheeling mode of the dc inductor currents during the switch on state. The voltage conversion ratio characteristics and semiconductor device voltage and current stresses are characterized. The main advantages of this converter are the continuous output current, smaller output voltage ripple, and lower semiconductors current stress compared with the conventional SEPIC converter. The design and simulation of the concept is verified by an experiment with a 48-V input and 12-V/3.75-A output converter.

Original languageEnglish
Pages (from-to)2377-2386
Number of pages10
JournalIEEE Transactions on Power Electronics
Issue number5
Publication statusPublished - 2008


  • Active clamp
  • Continuous conduction mode (CCM)
  • Dc-Dc power conversion
  • Ripple reduction
  • Single-ended primary inductor converter (SEPIC)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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