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21.4 A >78%-efficient light harvester over 100-to-100klux with reconfigurable PV-cell network and MPPT circuit

Inhee Lee, Wootaek Lim, Alan Teran, Jamie Phillips, Dennis Sylvester, David Blaauw
2016 2016 IEEE International Solid-State Circuits Conference (ISSCC)  
This paper presents a fully integrated light harvester that maintains >78% efficiency from 100lux to 100klux when charging a 1.5-to-2.5V battery with a 7.8mm 2 PV-cell network.  ...  Also, the PV-cell network configuration is dynamically updated to adjust to varying light intensity and battery voltage conditions using a compact maximum-power-point tracking (MPPT) circuit.  ...  The harvester enables charging of a 1.5V battery from as little as 7lux and maintains harvesting efficiency of >78% from 100lux to 100k lux and across a 1.5-to-2.5V battery voltage.  ... 
doi:10.1109/isscc.2016.7418061 pmid:27546942 pmcid:PMC4989850 dblp:conf/isscc/LeeLTPSB16 fatcat:6ia633z5yjdwpcajj26pzqnqwi

A 43%@0.1V efficiency self-sustaining solar energy harvester in indoor lighting

Deng-Bang Yu, Xin-Ning Liu, Jing Chen
2019 Journal of Physics, Conference Series  
This paper presents a self-sustaining solar energy harvester (EH) based on 130nm process, which consists of a low voltage cold start (CS) circuit and a high efficiency boost charger.  ...  The proposed boost charger utilizes a dual voltage technique for reducing the power dissipation of the internal circuit. The efficiency of the boost charger ranges from 43% at to 65% at .  ...  Acknowledgments This work is supported by National Science and Technology Major Project of China (Grant No. 2017X01030101).  ... 
doi:10.1088/1742-6596/1311/1/012053 fatcat:hxdvx5cerjhtvcgjqktrp23tsa