Evaluation of the Output Load Effect on a Piezoelectric Energy Harvester
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This paper presents the study of a vibration energy harvesting system using piezoelectric generator coupled to a cantilever beam when subjected to output loads with different electrical characteristics. The proposed analysis is based on the system frequency response under two scenarios at the output of the piezoelectric energy harvester: a purely resistive load and a full-wave rectifier before the load. A prototype capable of varying the amplitude and frequency of the input mechanical stimulus was constructed in order to evaluate the energy harvester. Then system identification techniques were employed to determine how the resonance frequency and output power are affected by the load. Experimental results showed that depending on the load there is significant change on the operating point at which the maximum power transfer occurs.
KeywordsEnergy harvesting Frequency response Output load Piezoelectricity
We would like to thanks CAPES and FAPERGS for the research support - PqG \(2110-2551/13-0\). J.V. Flores was supported by CNPq (Brazil) under grants 43979/2014-6 and 305886/2015-0.
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