Connection Configurations to Increase Operational Range and Output Power of Piezoelectric MEMS Vibration Energy Harvesters
Affiliation
University of Cambridge; University of ChesterPublication Date
2016-09-06
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Among the various methods of extracting energy harvested by a piezoelectric vibration energy harvester, full-bridge rectifiers (FBR) are widely employed due to its simplicity and stability. However, its efficiency and operational range are limited due to a threshold voltage that the open-circuit voltage generated from the piezoelectric transducer (PT) must attain prior to any energy extraction. This voltage linearly depends on the output voltage of the FBR and the forward voltage drop of diodes and the nature of the interface can significantly limit the amount of extracted energy under low excitation levels. In this paper, a passive scheme is proposed to split the electrode of a micromachined PT into multiple (n) equal regions, which are electrically connected in series. The power output from such a series connected MEMS PT allows for the generated voltage to readily overcome the threshold set by the FBR. Theoretical calculations have been performed in this paper to assess the performance for different series stages (n values) and the theory has been experimentally validated. The results show that a PT with more series stages (high n values) improves the efficiency of energy extraction relative to the case with fewer series-connected stages under weak excitation levels.Citation
Du, S., Chen, S., Jia, Y., Arroyo, E. & Seshia, A. (2016). Connection configurations to increase operational range and output power of piezoelectric MEMS vibration energy harvesters. Journal of Physics Conference Series, 773(1).Publisher
IOP PublishingAdditional Links
http://iopscience.iop.org/article/10.1088/1742-6596/773/1/012063Type
ArticleLanguage
enDescription
This document is the Accepted Manuscript version of a published work that appeared in final form in Journal of Physics: Conference Series. To access the final edited and published work see http://dx.doi.org/10.1088/1742-6596/773/1/012063ISSN
1742-6588EISSN
1742-6596ae974a485f413a2113503eed53cd6c53
10.1088/1742-6596/773/1/012063
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Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by/4.0/