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Abstract
This paper reports a polymer-based piezoelectric vibration energy harvester using mechanical frequency up-conversion driven by collision with a flexible beam, targeting for low-frequency vibration (under 10 Hz). By driving the flexible beam with low-frequency, the beam periodically hits against the underlying impact-driven piezoelectric component and excites the free oscillation, i.e. frequency up-conversion. We verified the validity of the proposed method by FEM analysis and the proposed vibration energy harvester showed 32 μW at 9 Hz of excitation frequency.
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