Efficiency of Energy Conversion for a Piezoelectric Power Harvesting System
Resource
Journal of Micromechanics and Microengineering 16: 2429-2438
Journal
Journal of Micromechanics and Microengineering 16
Pages
2429-2438
Date Issued
2006
Date
2006
Author(s)
Abstract
This paper studies the energy conversion efficiency for a rectified piezoelectric power harvester. An analytical model is proposed, and an expression of efficiency is derived under steady-state operation. In addition, the relationship among the conversion efficiency, electrically induced damping and ac–dc power output is established explicitly. It is shown that the optimization criteria are different depending on the relative strength of the coupling. For the weak electromechanical coupling system, the optimal power transfer is attained when the efficiency and induced damping achieve their maximum values. This result is consistent with that observed in the recent literature. However, a new finding shows that they are not simultaneously maximized in the strongly coupled electromechanical system. 1.
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