Paper Info
Title
A high efficiency, soft switching DC-DC converter with adaptive current-ripple control for portable applications
Abstract
A novel control scheme for improving the power efficiency of low-voltage dc-dc converters for battery-powered, portable applications is presented. In such applications, light-load efficiency is crucial for extending battery life, since mobile devices operate in stand-by mode for most of the time. The proposed technique adaptively reduces the inductor current ripple with decreasing load current while soft switching the converter to also reduce switching losses, thereby significantly improving light-load efficiency and therefore extending the operation life of battery-powered devices. A load-dependent, mode-hopping strategy is employed to maintain high efficiency over a wide load range. Hysteretic (sliding-mode) control with user programmable hysteresis is implemented to adaptively regulate the current ripple and therefore optimize conduction and switching losses. Experimental results show that for a 1-A, 5- to 1.8-V buck regulator, the proposed technique achieved 5% power efficiency improvement (from 72% to 77%) at 100 mA of load current and a 1.5% improvement (from 84% to 85.5%) at 300 mA, which constitute light-load efficiency improvements, when compared to the best reported, state-of-the-art techniques. As a result, the battery life in a typical digital signal processing microprocessor application is improved by 7%, which demonstrates the effectiveness of the proposed solution.
Year
DOI
Venue
2006
10.1109/TCSII.2005.859572
IEEE Trans. on Circuits and Systems
Keywords
Field
DocType
mobile devices,efficiency,switching regulator,1 a,adaptive current-ripple control,buck regulator,battery life,dc-dc power convertors,battery-powered devices,inductor current ripple,300 ma,microprocessor,user programmable hysteresis,low-power electronics,low-voltage converters,switching losses,soft switching,electric current control,adaptive control,hysteretic control,5 to 1.8 v,secondary cells,100 ma,dc–dc converter,sliding-mode control,buck converter,variable structure systems,digital signal processing,dc-dc converter,sliding mode control,power efficiency,hysteresis,inductors,low voltage,mobile device,low power electronics
Electrical efficiency,Control theory,Inductor,Electronic engineering,Converters,Adaptive control,Ripple,Battery (electricity),Buck converter,Mathematics,Low-power electronics
Journal
Volume
Issue
ISSN
53
4
1549-7747
Citations 
PageRank 
References 
24
4.48
0
Authors
2
Name
Order
Citations
PageRank
Siyuan Zhou1497.27
G. A. Rincon-Mora26415.02