Research On The Vibration Energy Harvesting Circuits With Piezoelectric Cantilever Structure

Among all kinds of energy harvesting technologies, piezoelectric vibration energy is the mostpromising one. From the piezoelectric energy harvesting devices, the process and the principle of thesingle-stage energy harvesting circuits were analysed. In order to enhance power harvesting efficiency,the single-stage energy harvesting circuits were improved and simulated. In addition, a new techniqueof double-stage energy harvesting circuits are investigated in the dissertation. Finally, according to themultimodal vibration, this paper created a effective energy harvesting method, which were provedthrough experiment. The main works in this dissertation include:(1) Based on the results of modal analysis and the parameters of piezoelectric materials, the accurateelectrical model of piezoelectric generator was fixed, which can convert a complex relationshipbetween machine and electric to a single problems.(2) Combined the constitutive equation of piezoelectric materials with the theory of mechanicalvibration, the process and the principle of the four kinds of single-stage energy harvesting circuitswere analysed, in order to enhance power harvesting efficiency, the single-stage energy harvestingcircuits were improved and simulated.(3) As for a double-stage energy harvesting circuits: Double synchronized switch harvesting circuit,this paper analyzed its work process and confirm it is better than the single-stage energy harvestingcircuits. In order to achieve application, a new self-powered DSSH circuit was designed. As shown inthe experimental results, Self-powered DSSH circuit output power can be3.05times of standardcircuit and keep constant.(4) According to the multimodal vibration, a effective energy harvesting method was created in thisdissertation, which is confirmed through a LabVIEW-Data Acquisition Card experimental platform.At last, the self-powered DSSH circuit was tested at multimodal vibration situation, the resultsshowed that Self-powered DSSH circuit output power can be3.6times of standard circuit.