A Switched Capacitor Multiple Input Single Output Energy Harvester (Solar + Piezo) Achieving 74.6% Efficiency With Simultaneous MPPT

This paper presents an inductor-less switched capacitor based energy harvester, which can simultaneously harvest from 2 energy sources (Solar + Piezo). The proposed harvester employs maximum power point tracking algorithm, by changing the conversion ratios of the charge pumps for piezo and solar sou...

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Bibliographic Details
Published inIEEE transactions on circuits and systems. I, Regular papers Vol. 66; no. 12; pp. 4876 - 4887
Main Authors Devaraj, Abhishekh, Megahed, Mohamed, Liu, Yutao, Ramachandran, Ashwin, Anand, Tejasvi
Format Journal Article
LanguageEnglish
Published New York IEEE 01.12.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Algorithms
Capacitors
Charge pumps
CMOS
Energy conversion efficiency
Energy harvester
Energy harvesting
Inductors
Input impedance
Mathematical model
Maximum power point trackers
Maximum power tracking
MISO
MISO communication
MPPT
piezoelectric
solar
switched capacitor
Switches
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Summary:This paper presents an inductor-less switched capacitor based energy harvester, which can simultaneously harvest from 2 energy sources (Solar + Piezo). The proposed harvester employs maximum power point tracking algorithm, by changing the conversion ratios of the charge pumps for piezo and solar sources, and output voltage control by varying the switching frequency. The proposed MPPT algorithm can match the input impedance of two sources simultaneously. Implemented in 65nm CMOS, the proposed harvester can generate a fixed output between 1.8 and 2.5 V output while delivering 35 μW to 70 μW power with a peak power conversion efficiency of 74.6%.
ISSN:1549-8328
1558-0806
DOI:10.1109/TCSI.2019.2934985