Digital primary-side sensing and PFC control of a flyback converter

Chih Wei Lin*, Ying-Yu Tzou

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

Primary-side sensing (PSS) technique can be used for the output voltage or current regulation of a flyback converter by employing an auxiliary winding for the indirect detection of output voltage and conduction period of the output rectifier diode. However, errors in the estimation of output voltage or current may be induced by the voltage drop of the secondary diode, secondary leakage inductance, secondary winding resistance, and measurement error due to limited bandwidth of the sensing circuits. In this paper, a sampling instant modulation technique is developed to reduce the sensing error in primary-side sensing of flyback converters. This new PSS sampling technique is then implemented for the power factor correction (PFC) of a flyback converter. A multi-mode control strategy can improve sampling accuracy at the zero-crossing of the rectified input voltage. Experimental results are shown to verify the feasibility of PSS technique realized with digital control technique.

Original languageEnglish
Title of host publicationIEEE Energy Conversion Congress and Exposition
Subtitle of host publicationEnergy Conversion Innovation for a Clean Energy Future, ECCE 2011, Proceedings
Pages2603-2608
Number of pages6
DOIs
StatePublished - 28 Nov 2011
Event3rd Annual IEEE Energy Conversion Congress and Exposition, ECCE 2011 - Phoenix, AZ, United States
Duration: 17 Sep 201122 Sep 2011

Publication series

NameIEEE Energy Conversion Congress and Exposition: Energy Conversion Innovation for a Clean Energy Future, ECCE 2011, Proceedings

Conference

Conference3rd Annual IEEE Energy Conversion Congress and Exposition, ECCE 2011
CountryUnited States
CityPhoenix, AZ
Period17/09/1122/09/11

Keywords

  • digital control
  • flyback converter
  • PFC
  • Primary-side sensing

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