Adaptive Sense Current Control for DC-DC Boost Converters to Get Accurate Voltage

Robert Chen-Hao CHANG  Hou-Ming CHEN  Wang-Chuan CHENG  Chu-Hsiang CHIA  Pui-Sun LEI  Zong-Yui LIN 

Publication
IEICE TRANSACTIONS on Electronics  Vol.E92-C  No.8  pp.1066-1072
Publication Date: 2009/08/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
Keyword: 
adaptive sense current controller,  inductor current,  output ripple voltage,  power-conversion efficiency, 

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Summary: 
This study utilizes a new adaptive sense current controller to get an accurate power supply. The proposed controller effectively reduces output ripple voltage of converters operated over the load current range. This reduction is realized using an adaptive sense current circuit that automatically adjusts the inductor current according to operational conditions. The proposed boost converter is designed and fabricated with a standard TSMC 3.3/5 V 0.35-µm 2P4M CMOS technology. The experimental results show that the power-conversion efficiency of the proposed boost converter is 2-5% higher than that of the conventional converter with a current-limited circuit. The proposed circuit greatly reduces (i.e. by 76%) output ripple voltage compared with the conventional circuit at a 10 mA loading current.