Title page for etd-0721109-103203


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URN etd-0721109-103203
Author Li-yang Hsiao
Author's Email Address No Public.
Statistics This thesis had been viewed 5570 times. Download 7853 times.
Department Electrical Engineering
Year 2008
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Single-Stage PFC Flyback Converter with Low Output Voltage Ripple
Date of Defense 2009-06-29
Page Count 64
Keyword
  • Power factor corrector (PFC)
  • Voltage ripple
  • Power factor
  • Fly-back converter
  • Abstract An auxiliary winding with an associated capacitor is added on the
    single-stage power factor corrector (PFC) based on fly-back conversion to
    reduce the ripple on the dc output voltage. The associated capacitor takes
    out partial energy at every switching cycle from the fly-back conversion
    and releases the stored energy to the load at the valley of the rectified line
    voltage. The negative effect of such an approach is that the converter does
    not draw a current from the AC line at the lower voltage near zero
    crossing, leading to deterioration in the power factor.
    This thesis analyzes how an auxiliary winding affects the voltage of
    the associated capacitor, which in turn changes the cut-in angle of the
    input current and thus the power factor of the AC source. To facilitate the
    implementation, the fly-back converter is operated at the boundary
    conduction mode (BCM). A design example is given for the 24 V, 48 W
    load, based on the derived equations. The laboratory circuit is built and
    tested to verify the computer simulations and analytical predictions. The
    experimental results confirm the circuit analyses on the converter
    performances.
    Advisory Committee
  • Hong-Chan Chang - chair
  • Ching-Ran Lee - co-chair
  • Ching-Tsai Pan - co-chair
  • Chih-Chiang Hua - co-chair
  • Chin-Sien Moo - advisor
  • Files
  • etd-0721109-103203.pdf
  • indicate access worldwide
    Date of Submission 2009-07-21

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