Micro piezoelectric wind-energy harvester based on the mechanism of wind-induced vibration

A micro piezoelectric wind-energy harvester is put forward based on the mechanism of wind-induced vibration, which would transfer the wind energy to the electricity. The device comprises a cavity and a piezo-film vibration sensor. A slender cylinder is attached at the free tip of piezoelectric film vibration beam, inducing the beam to vibrate because of the principle of vortex-induced vibration. Apart from the vortex-induced vibration, other types of wind-induced vibration also contribute to the vibration of piezoelectric film. The size of device is 30 mm×16 mm×14 mm, and under the condition of 7 m/s wind speed with 1.8 MΩ resistance, the power is 0.84 μW. Meanwhile, the efficiency can be raised by increasing the number of piezoelectric film vibration beam.