More general definition of energy factor and its application in isolated converters

Zhanghai Shi, Ka Wai Eric Cheng, Siu Lau Ho, Wei Xu

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)

Abstract

Energy factor proposed as a goodness factor for dc system is reviewed in this paper. More general definitions of energy storage and energy factor are presented based on the analysis of energy process. By these new definitions, energy factor and energy storage can be extended into ac system. They can be used to compare the performance of different topologies of dc converters. The investigation of transformer's energy storage indicates that transformer has important influence to the characteristics of whole circuit. It depends on the way that transformer operates. If the transformer run as inductor (like Flyback converter), then it will improve the energy factor of the whole converter. But if the transformer run as a real transformer, then it will increase the non-active power consumption and make the energy factor worse. Simulation results explain BuckBoost and Flyback converter absorb the same amount of non-active power from front-end power supply. But the latter has better inner characteristics. Both input and inner characteristics of Buck converter are better than those of its isolated version which is Forward converter.
Original languageEnglish
Title of host publication2009 3rd International Conference on Power Electronics Systems and Applications, PESA 2009
Publication statusPublished - 4 Nov 2009
Event2009 3rd International Conference on Power Electronics Systems and Applications, PESA 2009 - Hong Kong, Hong Kong
Duration: 20 May 200922 May 2009

Conference

Conference2009 3rd International Conference on Power Electronics Systems and Applications, PESA 2009
CountryHong Kong
CityHong Kong
Period20/05/0922/05/09

Keywords

  • Energy factor
  • Energy storage
  • Flyback converter
  • Forward converter

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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