Abstract
Piezoelectric Energy Harvester (PEH) is a promising technology for harvesting energy from low frequency ambient vibrations. To generate the power from these low-frequency signals, PEH device must adapt its attributes according to respective applied input frequency range or has a wide operational frequency band. This paper presents, an experimental study of PEH providing two different modes of operation. The first working mode is a result of beams resonant frequency which is auto-tunable due to moving Centre of Gravity (CoG). The second mode of operation is mainly due to cylinders rotational and vibration motion creating impact on beams surface as well as on walls of proof mass. The device provides dual band nature for applied frequency range. The maximum power transfer is studied by varying the resistive load experimentally and FEM simulation is also carried out for the same. First working mode provides frequency band of 21–35Hz generating average power (r.m.s.) of \(6\upmu \hbox {W}\) with the optimal load of \(5\hbox {M}\Omega\). Second working mode has a frequency band of 45–60 Hz with an average harvested power (r.m.s.) of \(7.75\upmu \hbox {W}\) with \(2\hbox {M}\Omega\) optimal load. The maximum harvested output power (r.m.s.) is \(13.18\upmu \hbox {W}\). The effect of acceleration is studied for both working modes of the device. The frequency tuning range for the device is obtained as 46.96% for the provided band.
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Chandwani, J., Somkuwar, R. & Deshmukh, R. Multi-band piezoelectric vibration energy harvester for low-frequency applications. Microsyst Technol 25, 3867–3877 (2019). https://doi.org/10.1007/s00542-019-04321-6
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DOI: https://doi.org/10.1007/s00542-019-04321-6