Lossless DCR current sensing for multi-winding coupled inductors

Bradley Oraw, Raja Ayyanar

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

Abstract

Lossless DCR current sensing is common in multiphase point of load converters. A multiphase buck with coupled inductors exhibits a larger steady state inductance than transient inductance. Since there are two distinct values of inductance, it unclear which value to use in the conventional DCR sensing scheme. A first assumption might be to use the transient inductance, so that closed loop stability is not compromised. The current slew will be measured accurately, but the measured ripple magnitude will be incorrect. Accurate measurements of both the ripple and the current slew of coupled inductors cannot be produced using conventional DCR sensing. This paper proposes a new DCR sensing scheme that resolves the inaccuracies of conventional sensing.

Original languageEnglish (US)
Title of host publicationINTELEC 2008
Subtitle of host publication30th Annual International Telecommunications Energy Conference
DOIs
StatePublished - Dec 30 2008
Event30th Annual International Telecommunications Energy Conference, INTELEC 2008 - San Diego, CA, United States
Duration: Sep 14 2008Sep 18 2008

Publication series

NameINTELEC, International Telecommunications Energy Conference (Proceedings)
ISSN (Print)0275-0473

Other

Other30th Annual International Telecommunications Energy Conference, INTELEC 2008
CountryUnited States
CitySan Diego, CA
Period9/14/089/18/08

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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  • Cite this

    Oraw, B., & Ayyanar, R. (2008). Lossless DCR current sensing for multi-winding coupled inductors. In INTELEC 2008: 30th Annual International Telecommunications Energy Conference [4664023] (INTELEC, International Telecommunications Energy Conference (Proceedings)). https://doi.org/10.1109/INTLEC.2008.4664023