Analysis of integrated boost-flyback step-up converter

T. J. Liang, K. C. Tseng

Research output: Contribution to journalArticlepeer-review

248 Citations (Scopus)


The operating principles, theoretical analysis, and design methodology of a high-efficiency step-up converter are presented. The integrated boost-flyback converter (IBFC) uses coupled-inductor techniques to achieve high step-up voltage with low duty ratio, and thus the slope compensation circuit is disregarded. The voltage gain and efficiency at steady state are derived using the principles of inductor volt-second balance, capacitor charge balance and the small-ripple approximation for continuous-conduction mode. Finally, a 35 W, 12 V DC input, 48 V DC output, fsw=40 kHz IBFC has been implemented in the laboratory to validate the theoretical analysis. A design procedure is expounded, and design guidelines for selecting critical components are also presented. It is shown that high voltage gain with high efficiency can be achieved by the IBFC system.

Original languageEnglish
Pages (from-to)217-225
Number of pages9
JournalIEE Proceedings: Electric Power Applications
Issue number2
Publication statusPublished - 2005 Mar 1

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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