A Novel Phase-Shedding Control Scheme for Improved Light Load Efficiency of Multiphase Interleaved DC–DC Converters

Author

Jen-Ta Su ; Chih-Wen Liu

Author_Institution

Ind. Stand. Server, Hewlett-Packard Co., Taipei, Taiwan

Volume

28

Issue

10

fYear

2013

fDate

Oct. 2013

Firstpage

4742

Lastpage

4752

Abstract

In this paper, a novel phase-shedding control scheme for multiphase interleaved dc-dc converters is proposed to improve the light load efficiency. The proposed phase-shedding scheme is based upon power efficiency estimation with a numerically constructed lookup table and a phase configuration selector to automatically determine the load current point of phase shedding for the minimization of the power loss during the light load condition. The proposed scheme is verified on a three-phase-interleaved dc-dc synchronous buck converter with a 12 V input and 1.2 V, 60 A output. Experimental results are presented to demonstrate the effectiveness of the proposed scheme.

Keywords

DC-DC power convertors; phase control; current 60 A; light load efficiency improvement; lookup table; multiphase interleaved dc-dc converters; phase configuration selector; phase-shedding control scheme; power efficiency estimation; power loss; three-phase-synchronous buck converter; voltage 1.2 V; voltage 12 V; Inductors; Logic gates; Power MOSFET; Switches; Table lookup; Temperature measurement; DC–DC converters; light load efficiency; lookup table; phase configuration selector; phase shedding;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2012.2233220

Filename

6377309