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Co-optimization of a piezoelectric energy harvesting system for broadband operation

Author(s)
Radhakrishna, Ujwal; Lang, J. H.
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Creative Commons Attribution 3.0 unported license https://creativecommons.org/licenses/by/3.0/
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Abstract
The goal of this research is to increase the bandwidth (BW) over which substantial energy can be harvested using a piezoelectric energy harvester (PEH). The key innovation is the use of bias-flip (BF) electronics at the output of a PEH having a large electromechanical coupling coefficient κe2. For a PEH with large κe2, the open-circuit resonance frequency f oc is substantially larger than the short-circuit resonance frequency f sc. Over the intervening range, the reactive part of the conjugate matched load impedance is small, and can be approximated using BF electronics in which the BF voltage is sufficiently small and the BF losses are small. This results in a large BW over which substantial energy can be harvested. Experimental results using a commercially available PEH are presented to demonstrate this concept. Design guidelines are provided for achieving PEHs having increased κe2.
Date issued
2019-11
URI
https://hdl.handle.net/1721.1/125730
Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of Electronics
Journal
Journal of Physics: Conference Series
Publisher
IOP Publishing
Citation
Zhao. S. et al. “Co-optimization of a piezoelectric energy harvesting system for broadband operation,” Journal of Physics: Conference Series, vol. 1407, 2019, 012010 © 2019 The Author(s)
Version: Final published version
ISSN
1742-6596
1742-6588

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