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27 April 2007 A comparison between the standard and SSHI interfaces used in piezoelectric power harvesting
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This article provides an analysis for the performance evaluation of a piezoelectric power harvesting system using either the standard or SSHI electronic interfaces. Instead of using the un-coupled and in-phase assumptions, an analytic expression of harvested power is proposed for the SSHI circuit based on the improved analysis. It is shown that the behavior of an ideal SSHI system is similar to that of strongly coupled electromechanical system using the standard interface operated at the short circuit resonance. In addition, the performance evaluation of a SSHI circuit is classified according to the relative magnitudes of electromechanical coupling coefficient and the mechanical damping ratio. It is found that the best use of the SSHI harvesting circuit is for the system with the medium range of electromechanical coupling. The performance degradation due to the non-perfect voltage inversion is not pronounced in this case, and a new finding shows that the average harvesting power is much less sensitive in frequency compared to that using the standard interface.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Y. C. Shu and I. C. Lien "A comparison between the standard and SSHI interfaces used in piezoelectric power harvesting", Proc. SPIE 6525, Active and Passive Smart Structures and Integrated Systems 2007, 652509 (27 April 2007);

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