A Fully-Integrated Switched-Capacitor DC-DC Converter for Indoor Photovoltaic Energy Harvesting

• Main Authors: Huang, Chao-Yi, 黃晁毅
• Other Authors: Chen, Po-Hung
• Format: Others
• Language: en_US
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/7wd623

碩士 === 國立交通大學 === 電子研究所 === 107 === This paper presents a 400-600 mV input, 900-1100 mV output fully-integrated switched-capacitor (SC) based step-up dc–dc converter with loading time extending (LTE) technique implemented in 0.18 μm CMOS technology for photovoltaic cell under indoor-light conditions. Indoor-light provides ultra-low input power which leads to ultra-low output power. Output voltage can be regulated to 1V under light-load conditions; however, there is only certain amount of time for the converter to operate above the voltage available for heavy-load output devices. The proposed LTE technique and cross-coupled based charge pumps (CCBCP) extend loading time (LT) under heavy load-current conditions. The proposed method automatically extends loading time without the need of additional capacitors or off-chip components. The experimental results show that the loading time of the proposed converter is enhanced by 50% at output load currents of 1mA. The proposed fully-integrated switched-capacitor based step-up dc–dc converter also provides 70.04% peak efficiency at output load currents of 1 μA and above 60% over the range of 0.5~2μA.