Table of Contents
Smart Materials Research
Volume 2013, Article ID 410567, 7 pages
http://dx.doi.org/10.1155/2013/410567
Research Article

Power Consideration in a Piezoelectric Generator

1Laboratoire d’Electrotechnique et d’Electronique de Puissance, 59000 Villeneuve d’Ascq, France
2University Lille 1, avenue Paul Langevin, 59000 Villeneuve d’Ascq, France
3Department of Electrical & Computer Engineering, University of Toronto, Toronto, ON, Canada M5S 3G4
4Arts et Métiers Paris Tech, Boulevard Louis XIV, 59000 Lille, France

Received 24 June 2013; Accepted 11 August 2013

Academic Editor: Chris Bowen

Copyright © 2013 Rémi Tardiveau et al. 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.

Abstract

A piezoelectric generator converts mechanical energy into electricity and is used in energy harvesting devices. In this paper, synchronisation conditions in regard to the excitation vibration are studied. We show that a phase shift of ninety degrees between the vibration excitation and the bender’s displacement provides the maximum power from the mechanical excitation. However, the piezoelectric material is prone to power losses; hence the bender’s displacement amplitude is optimised in order to increase the amount of power which is converted into electricity. In the paper, we use active energy harvesting to control the power flow, and all the results are achieved at a frequency of 200 Hz which is well below the generator’s resonant frequency.