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Proceedings Paper

Rectifier-less piezoelectric micro power generator
Author(s): Arman Hajati; Sang-Gook Kim
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Paper Abstract

A novel thin film lead zirconate titanate Pb(Zr,Ti)O3 (PZT) MEMS energy harvesting device is designed and developed for powering autonomous wireless sensors. It is designed to harvest energy from parasitic vibrational energy sources and convert it to electrical energy via the piezoelectric effect. The new pie-shaped design for the harvester is about a size of a nickel and has a radical departure from previous design concepts. This design always generates positive tension on the PZT layer and then positive charge output throughout vibration cycles. It produces mono-polarity output charge without using any additional bridge rectifier circuitry, which will be a huge cost saving for commercial production of scaled-up products. Contrary to the high Q cantilever designs, the new design has a low Q, doubly anchored beam design, which provides a wide bandwidth of operational frequency. This will enable more robust power generation even if the frequency spectrum of the source vibration varies unexpectedly. Furthermore, the beam shape is optimized to achieve uniform strain throughout the PZT layer. To authors' knowledge, this is the first self-rectifying piezoelectric power generator at the MEMS-scale

Paper Details

Date Published: 18 April 2008
PDF: 11 pages
Proc. SPIE 6928, Active and Passive Smart Structures and Integrated Systems 2008, 69281T (18 April 2008); doi: 10.1117/12.775475
Show Author Affiliations
Arman Hajati, Massachusetts Institute of Technology (United States)
Sang-Gook Kim, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 6928:
Active and Passive Smart Structures and Integrated Systems 2008
Mehdi Ahmadian, Editor(s)

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