High-efficiency slope compensator (HSC) with input-independent load condition identification in current mode DC/DC buck converters

Wei Jen Lai*, Chi Lin Chen, Yu Chiao Hsieh, Ke-Horng Chen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

A high-efficiency slope compensator (HSC) is presented to achieve power reduction in current-mode control and provide input-independent load condition identification for mode switch in hybrid PWM/PFM system. That is, according to load condition, an adaptive mode transition can be decided by the HSC circuit and not varied by the variation of input voltage. Therefore, for a hybrid PWM/PFM system, the power conversion efficiency can be kept high over a wide load range. Besides, the pulse-ramp slope compensation technique prevents the current-mode DC-DC converter from having the sub-harmonic oscillation problem and reduces power dissipation of the slope compensator. Simulation results show that the mode transition is accurately decided at the optimum point without being affected by the variation of input voltage. The power conversion efficiency is improved about 5% in PWM/PFM transition region.

Original languageEnglish
Title of host publication2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009
Pages2897-2900
Number of pages4
DOIs
StatePublished - 28 Dec 2009
Event2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009 - San Jose, CA, United States
Duration: 20 Sep 200924 Sep 2009

Publication series

Name2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009

Conference

Conference2009 IEEE Energy Conversion Congress and Exposition, ECCE 2009
CountryUnited States
CitySan Jose, CA
Period20/09/0924/09/09

Keywords

  • Adaptive mode transition
  • Current-mode buck converter
  • Hybrid mode system
  • Slope compensation

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