Lossless DCR current sensing for multi-winding coupled inductors

Bradley Oraw; Raja Ayyanar

doi:10.1109/INTLEC.2008.4664023

Lossless DCR current sensing for multi-winding coupled inductors

Bradley Oraw, Raja Ayyanar

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Scopus citations

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 language	English (US)
Title of host publication	INTELEC 2008
Subtitle of host publication	30th Annual International Telecommunications Energy Conference
DOIs	https://doi.org/10.1109/INTLEC.2008.4664023
State	Published - Dec 30 2008
Event	30th Annual International Telecommunications Energy Conference, INTELEC 2008 - San Diego, CA, United States Duration: Sep 14 2008 → Sep 18 2008

Publication series

Name	INTELEC, International Telecommunications Energy Conference (Proceedings)

Other

Other	30th Annual International Telecommunications Energy Conference, INTELEC 2008
Country/Territory	United States
City	San Diego, CA
Period	9/14/08 → 9/18/08

ASJC Scopus subject areas

Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1109/INTLEC.2008.4664023

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), 30th Annual International Telecommunications Energy Conference, INTELEC 2008, San Diego, CA, United States, 9/14/08. https://doi.org/10.1109/INTLEC.2008.4664023

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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.",

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doi = "10.1109/INTLEC.2008.4664023",

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AB - 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.

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M3 - Conference contribution

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Lossless DCR current sensing for multi-winding coupled inductors

Abstract

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