Adaptive Window Control (AWC) Technique for Hysteresis DC–DC Buck Converters With Improved Light and Heavy Load Performance

Author

Huang, Han-Hsiang ; Chen, Chi-Lin ; Chen, Ke-Horng

Author_Institution

Dept. of Electr. & Control Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

Volume

24

Issue

6

fYear

2009

fDate

6/1/2009 12:00:00 AM

Firstpage

1607

Lastpage

1617

Abstract

This paper presents a new adaptive window control (AWC) technique to adjust the hysteresis window to reduce the output ripple at heavy loads and keep the switching frequency higher than the acoustic frequency at light loads. Therefore, the driving capability and the power conversion efficiency of the hysteresis converter are improved at heavy loads. Besides, a new class AB current sensing circuit is also proposed to provide fast and accurate current sensing signal for achieving fast hysteresis window adjustment. Experimental results show that the proposed AWC technique not only reduces the output ripple smaller than 12 mV when load current is 800 mA to improve the power conversion efficiency but also keeps the switching frequency higher than acoustic frequency at light loads to avoid undesired noise.

Keywords

DC-DC power convertors; adaptive control; electric current control; DC-DC buck converters; adaptive window control; class AB current sensing circuit; current 800 mA; hysteresis window; power conversion efficiency; Acoustic noise; Adaptive control; Buck converters; Circuits; Frequency conversion; Hysteresis; Lighting control; Power conversion; Programmable control; Switching frequency; Adaptive window control; hysteresis converter; output ripple;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2009.2014687

Filename

5109754