Analysis and design of a single-stage parallel AC-to-DC converter

Heng Yi Li*, Hung-Chi Chen, Lon Kou Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


In this paper, a single-stage (S2) parallel ac-to-dc converter based on single-switch two-output boostflyback converter is presented. The converter contains two semistages. One is the boostflyback semistage, which transfers partial input power transferred to load directly through one power flow path and has excellent self-power factor correction property when operating in discontinuous conduction mode even though the boost output is close to the peak value of the line voltage. The other one is the flyback dc-to-dc (dc/dc) semistage that provides the output regulation on another parallel power flow path. With this design, the power conversion efficiency is improved and the current stress of control switch is reduced. Furthermore, the calculation process of power distribution and bulk capacitor voltage, design equations, and design procedure for key parameters are also presented. By following the procedure, an 80 W prototype converter has been built and tested. The experimental results show that the measured line harmonic current at the worst condition complies with the IEC61000-3-2 class D limits, the maximum bulk capacitor voltage is about 415.4 V, and the maximum efficiency is about 85.8%. Hence, the proposed S2converter is suitable for universal input usage.

Original languageEnglish
Article number5200457
Pages (from-to)2989-3002
Number of pages14
JournalIEEE Transactions on Power Electronics
Issue number12
StatePublished - 1 Dec 2009


  • AC/DC power conversion
  • Fly back converter
  • Power factor correction
  • Single-stage
  • Single-switch

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