| 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. |
