Proceedings of the KIPE Conference (전력전자학회:학술대회논문집)

The Korean Institute of Power Electronics (전력전자학회)
권호 표지

A Novel Lossless Current Sensing Technique for Synchronous Buck Converter

동기 벅 컨버터의 새로운 무손실 전류 측정 기법

  • Kang, B.K. (Dept of Electrical & Electronic Engineering Gyeongsang National University) ;
  • Kim, M.H. (Dept of Electrical & Electronic Engineering Gyeongsang National University) ;
  • Lim, J.G. (Dept of Electrical & Electronic Engineering Gyeongsang National University) ;
  • Chung, S.K. (Dept of Electrical & Electronic Engineering Gyeongsang National University)
  • 강병극 (경상대학교 전기전자공학부) ;
  • 김무현 (경상대학교 전기전자공학부) ;
  • 임정규 (경상대학교 전기전자공학부) ;
  • 정세교 (경상대학교 전기전자공학부)
  • Published : 2008.06.30
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Abstract

A novel lossless current sensing technique for a synchronous buck converter is presented. The inductor DCR method is generally used as a low cost and lossless current sensing technique of DC/DC converters. It is however difficult to obtain the accurate current value for the conventional DCR method because the inductor resistance varies depending on the operating frequency. In order to overcome this problem, an improved current sensing technique is proposed, which has the separated DC and AC sensing circuits. The concept and operation of the proposed method are explained and the experimental results are provided to show its effectiveness.

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