Performance improvement of flexible piezoelectric energy harvester for irregular human motion with energy extraction enhancement circuit

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Flexible piezoelectric energy harvesters (f-PEHs) have drawn attention for their potential use as power sources for wearable electronics. However, the amount of power harvested from conventional f-PEHs is still insufficient for achieving energy autonomy; hence, they are only used for limited applications. One of the effective approaches to enhancing the energy extraction from an f-PEH is to optimize the harvesting circuits. In this article, an energy extraction enhancement circuit (EEEC) using an f-PEH based on piezoelectric (PZT) material is reported to improve energy harvesting from irregular human movement of a joint or limb. The proposed EEEC is optimized for harvesting energy from random energy inputs with varying magnitudes and intervals, just like sporadic and irregular human movement. An f-PEH with a total thickness of 170 mu m is utilized, which provides sufficient flexibility for attachment on clothes or human skin. By minimizing the capacitive load experienced by the PZT material during deformation, the EEEC maximizes the output voltage and increases the amount of extracted energy with low static power consumption (1.15 nW). Compared with a conventional full bridge rectifier (FBR)-based harvesting circuit, energy extraction is enhanced up to 495%.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2019-04
Language
English
Article Type
Article
Citation

NANO ENERGY, v.58, pp.211 - 219

ISSN
2211-2855
DOI
10.1016/j.nanoen.2019.01.049
URI
http://hdl.handle.net/10203/253944
Appears in Collection
RIMS Journal PapersME-Journal Papers(저널논문)MS-Journal Papers(저널논문)
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