Title :
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
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;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2012.2233220
