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http://dx.doi.org/10.3795/KSME-A.2015.39.5.499

On the Energy Conversion Efficiency of Piezoelectric Vibration Energy Harvesting Devices  

Kim, Jae Eun (School of Mechanical and Automotive Engineering, Catholic Univ. of Daegu)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.39, no.5, 2015 , pp. 499-505 More about this Journal
Abstract
To properly design and assess a piezoelectric vibration energy harvester, it is necessary to consider the application of an efficiency measure of energy conversion. The energy conversion efficiency is defined in this work as the ratio of the electrical output power to the mechanical input power for a piezoelectric vibration energy harvester with an impedance-matched load resistor. While previous research works employed the electrical output power for approximate impedance-matched load resistance, this work derives an efficiency measure considering optimally matched resistance. The modified efficiency measure is validated by comparing it with finite element analysis results for piezoelectric vibration energy harvesters with three different values of the electro-mechanical coupling coefficient. New findings on the characteristics of energy conversion and conversion efficiency are also provided for the two different impedance matching methods.
Keywords
Vibration; Energy Harvesting; Piezoelectricity; Conversion Efficiency; Impedance Matching; Electro-Mechanical Coupling Coefficient;
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Times Cited By KSCI : 4  (Citation Analysis)
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