Abstract
We present an omnidirectional energy harvester with lowest resonance mode at 14.85 Hz. The geometry is designed as a spiral shaped, 500 μm thick PZT lateral bimorph to achieve a low resonance frequency while minimizing the area required. The resonance modes and frequencies of the energy harvester are investigated with COMSOL eigenfrequency study. The resonance modes of translation in x, y, z, and rotation around x, y, and z have resonance frequencies at 23.4, 22.9, 14.9, 34.0, 33.6, and 25.5 Hz, respectively. Multiple resonance modes widen bandwidth and enable harvesting energy from all directions. The energy harvester is mounted inside a 3D printed package that can be worn on a human wrist. The design of the package mimics the approximate size of a typical smartwatch, and the motion from walking is along the most sensitive axes of the harvester. It produces an output of 900 mV peak-to-peak for an optimum load of 1.8 megaohms and provided 0.45 microwatts. The output voltage is high enough to charge a battery through commercial diodes.
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