A low frequency MEMS energy harvester scavenging energy from magnetic field surrounding an AC current-carrying wire
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Published Version
Date
2016-11
Authors
Olszewski, Oskar Zbigniew
Houlihan, Ruth
Mathewson, Alan
Jackson, Nathan
Journal Title
Journal ISSN
Volume Title
Publisher
IOP Publishing
Published Version
Abstract
This paper reports on a low frequency piezoelectric energy harvester that scavenges energy from a wire carrying an AC current. The harvester is described, fabricated and characterized. The device consists of a silicon cantilever with integrated piezoelectric capacitor and proof-mass that incorporates a permanent magnet. When brought close to an AC current carrying wire, the magnet couples to the AC magnetic field from a wire, causing the cantilever to vibrate and generate power. The measured average power dissipated across an optimal resistive load was 1.5 μW. This was obtained by exciting the device into mechanical resonance using the electro-magnetic field from the 2 A source current. The measurements also reveal that the device has a nonlinear response that is due to a spring hardening mechanism.
Description
Keywords
Piezoelectric energy harvester , Energy scavenger , Mechanical resonance , AC current
Citation
Olszewski, O. Z., Houlihan, R., Mathewson, A., and Jackson, N. (2016) ‘A low frequency MEMS energy harvester scavenging energy from magnetic field surrounding an AC current-carrying wire’, Journal of Physics: Conference Series, 757, 012039 (6pp). doi: