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Increasing the output from piezoelectric energy harvester using width-split method with verification

Authors
  • Sang, Chow Man1
  • Dayou, Jedol1
  • Liew, Willey Y. H.2
  • 1 Universiti Malaysia Sabah, Jalan UMS, Energy, Vibration and Sound Research Group (e-VIBS), School of Science and Technology, Kota Kinabalu, Sabah, 88400, Malaysia , Kota Kinabalu, Sabah (Malaysia)
  • 2 Universiti Malaysia Sabah, Jalan UMS, School of Engineering and Information Technology, Kota Kinabalu, Sabah, 88400, Malaysia , Kota Kinabalu, Sabah (Malaysia)
Type
Published Article
Journal
International Journal of Precision Engineering and Manufacturing
Publisher
Springer Berlin Heidelberg
Publication Date
Dec 04, 2013
Volume
14
Issue
12
Pages
2149–2155
Identifiers
DOI: 10.1007/s12541-013-0291-8
Source
Springer Nature
Keywords
License
Yellow

Abstract

This paper proposes a new scheme for piezoelectric energy harvesting maximization. The proposed enhancement relies on a new topology of splitting a specified dimension piezo composite bender into beams with smaller width and, therefore, higher quality factor (or Q factor). The increase of Q factor allows a much more effective energy conversion process. It is shown that the proposed method, based on single splitting, increases the harvested power by a factor of up to √6, and up to √7.62 for two even-splitting compared to with no splitting. The wideband operation is accomplished by using different resonating benders in such a way that individual benders are each tuned to a different resonance frequency. Taking the configuration of single even-splitting as an example, the power output of the prototype was 39 μW at 27.2 Hz with 8 Hz bandwidth under 2 mm peak-to-peak input displacement and 3 Hz variation in resonant frequency. This corresponds to more than 2 times of power output with no splitting as well as about 23% increase in bandwidth. Such power output is sufficient to power up electronics devices such as a “2 AA dry cells-powered” digital clock with the wider range operating frequency.

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