Parametric studies on the harvested energy of piezoelectric switching techniques

Abstract

Piezoelectric energy harvesting techniques have experienced increasing research effortduring the last few years. Possible applications including wireless, fully autonomouselectronic devices, such as sensors, have attracted great interest. The key aspect ofharvesting techniques is the amount of converted and stored energy, because the energysource and the conversion rate is limited. In particular, switching techniques offer manyparameters that can be optimized. It is therefore crucial to examine the influence of theseparameters in a precise manner.This paper addresses an accurate analytical modeling approach, facilitating the calculationof standard-DC and parallel SSHI-DC energy harvesting circuits. In particular the influenceof the frequency ratio between the excitation and the electrical resonance of the switchingLR-branch, and the voltage gaps across the rectifier diodes are studied in detail.Additionally a comparison with the SSDI damping network is performed. Therelationship between energy harvesting and damping is indicated in this paper.