Piezoelectric energy harvester converting strain energy into kinetic energy for extremely low frequency operation

Dae Sung Kwon; Hee Jin Ko; Min Ook Kim; Yongkeun Oh; Jaesam Sim; Kyounghoon Lee; Kyung Ho Cho; Jongbaeg Kim

doi:10.1063/1.4869130

Piezoelectric energy harvester converting strain energy into kinetic energy for extremely low frequency operation

Dae Sung Kwon, Hee Jin Ko, Min Ook Kim, Yongkeun Oh, Jaesam Sim, Kyounghoon Lee, Kyung Ho Cho, Jongbaeg Kim

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

In this study, we developed a flexible energy harvester that uses the frequency up-conversion mechanism. The harvester is composed of a flexible piezoelectric cantilever and substrate, and it can scavenge energy from deformation or strain by converting it into a mechanical vibration of the cantilever. We found experimentally that the output voltage of the harvester not affected by an input frequency as long as the strain was large enough, and there was no lower limit of the input frequency. The critical strain, i.e., the threshold radius of curvature of the harvester, could be modulated by adjusting magnetic force; therefore, it is possible to optimally apply the harvester to various deformation ranges. The maximum and average power density at 0.5 Hz of input frequency was measured to be 320 μW/cm² and 6.8 μW/cm² for a resistive load of 10 MΩ.

Original language	English
Article number	113904
Journal	Applied Physics Letters
Volume	104
Issue number	11
DOIs	https://doi.org/10.1063/1.4869130
Publication status	Published - 2014 Mar 17

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4869130

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title = "Piezoelectric energy harvester converting strain energy into kinetic energy for extremely low frequency operation",

abstract = "In this study, we developed a flexible energy harvester that uses the frequency up-conversion mechanism. The harvester is composed of a flexible piezoelectric cantilever and substrate, and it can scavenge energy from deformation or strain by converting it into a mechanical vibration of the cantilever. We found experimentally that the output voltage of the harvester not affected by an input frequency as long as the strain was large enough, and there was no lower limit of the input frequency. The critical strain, i.e., the threshold radius of curvature of the harvester, could be modulated by adjusting magnetic force; therefore, it is possible to optimally apply the harvester to various deformation ranges. The maximum and average power density at 0.5 Hz of input frequency was measured to be 320 μW/cm2 and 6.8 μW/cm2 for a resistive load of 10 MΩ.",

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AU - Kwon, Dae Sung

AU - Ko, Hee Jin

AU - Kim, Min Ook

AU - Oh, Yongkeun

AU - Sim, Jaesam

AU - Lee, Kyounghoon

AU - Cho, Kyung Ho

AU - Kim, Jongbaeg

PY - 2014/3/17

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