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Sensors 2015, 15(6), 12218-12241; doi:10.3390/s150612218

Microfabrication and Integration of a Sol-Gel PZT Folded Spring Energy Harvester

1
Department of Mechanical Engineering, University of Alberta, University of Alberta, Edmonton, AB T6G 2G8, Canada
2
Department of Electrical and Computer, University of Alberta, University of Alberta, Edmonton, AB T6G 2V4, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Yasufumi Enami
Received: 11 March 2015 / Accepted: 18 May 2015 / Published: 26 May 2015
(This article belongs to the Special Issue Sol-Gel Based Sensors and Devices)

Abstract

This paper presents the methodology and challenges experienced in the microfabrication, packaging, and integration of a fixed-fixed folded spring piezoelectric energy harvester. A variety of challenges were overcome in the fabrication of the energy harvesters, such as the diagnosis and rectification of sol-gel PZT film quality and adhesion issues. A packaging and integration methodology was developed to allow for the characterizing the harvesters under a base vibration. The conditioning circuitry developed allowed for a complete energy harvesting system, consisting a harvester, a voltage doubler, a voltage regulator and a NiMH battery. A feasibility study was undertaken with the designed conditioning circuitry to determine the effect of the input parameters on the overall performance of the circuit. It was found that the maximum efficiency does not correlate to the maximum charging current supplied to the battery. The efficiency and charging current must be balanced to achieve a high output and a reasonable output current. The development of the complete energy harvesting system allows for the direct integration of the energy harvesting technology into existing power management schemes for wireless sensing. View Full-Text
Keywords: PZT sol-gel; piezoelectric energy harvesting; conditioning circuitry; microfabrication; MEMS; packaging; integration; feasibility study PZT sol-gel; piezoelectric energy harvesting; conditioning circuitry; microfabrication; MEMS; packaging; integration; feasibility study
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lueke, J.; Badr, A.; Lou, E.; Moussa, W.A. Microfabrication and Integration of a Sol-Gel PZT Folded Spring Energy Harvester. Sensors 2015, 15, 12218-12241.

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