• DocumentCode
    846545
  • Title

    Single-Stage Soft-Switching AC–DC Converter With Input-Current Shaping for Universal Line Applications

  • Author

    Yen-Ming Liu ; Lon-Kou Chang

  • Author_Institution
    Delta Electron. Inc., Chungli
  • Volume
    56
  • Issue
    2
  • fYear
    2009
  • Firstpage
    467
  • Lastpage
    479
  • Abstract
    In this paper, a novel single-stage soft-switching ac-dc converter for universal line applications is presented. Unlike the conventional single-stage designs, the proposed input-current shaping scheme is intentionally arranged to be charged in the duty-off time. With this design, the switch current stress in the duty-on time is significantly reduced. Meanwhile, this design produces AC modulation effect on the charging time of the boost inductor so that the input i-nu curve drawn by the proposed converter has nearly linear relationship. Moreover, an active-clamp flyback-forward topology is used as the downstream DC-DC cell to alleviate voltage stress across the bulk capacitor. By deactivating the flyback subconverter and keeping the forward subconverter supplying the output power at light-load condition, the bulk-capacitor voltage can be alleviated effectively and guaranteed below 450 V in wide ranges of output load and line input (90-265 Vrms). Experimental results, obtained from a prototype circuit with 20-V/100-W output, have verified that three achievements can be obtained simultaneously, including the compliance with the line-current harmonic regulations, the reliable alleviation of the bulk-capacitor voltage stress, and the substantially promoted conversion efficiency.
  • Keywords
    AC-DC power convertors; harmonic analysis; power capacitors; power inductors; AC modulation effect; active-clamp flyback-forward topology; boost inductor; bulk-capacitor voltage stress; downstream DC-DC cell; duty-on time; input-current shaping scheme; line-current harmonic regulations; power 100 W; single-stage soft-switching AC-DC converter; switch current stress; universal line applications; voltage 20 V; AC–DC converter; input-current shaping (ICS); single stage; soft switching;
  • fLanguage
    English
  • Journal_Title
    Industrial Electronics, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0278-0046
  • Type

    jour

  • DOI
    10.1109/TIE.2008.2004392
  • Filename
    4608739