Piezoelectric Vibration-Energy Acquisition System Based on Multimodal-Spread-Spectrum Theory
In this study,multimodal acquisition and bandwidth broadening are enhanced by employing multimo-dal spread spectrum theory to establish a versatile piezoelectric vibration-energy acquisition system.The system comprises two modules-an energy collector and a power-management circuit.The collector operates across four res-onant frequencies,thus ensuring efficient energy harvesting in low-frequency vibration settings.The power-manage-ment circuit converts AC power into stable DC power for charging energy-storage components.Following modal-harmony response analysis,an experimental platform is constructed for system testing.Experimental results indi-cate an operational frequency band of 16.1 to 27.8 Hz,with a peak output voltage of 33.75 V under a simple har-monic force and an acceleration of 6 m/s2.Upon impedance matching,the optimal resistance value is shown to be 200 kΩ,which results in an output power of 115.85 μW.
multimodalmulti directionalbroadbandpiezoelectricityvibration energy collection
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