Enhancement of power output by a new stress-applied mode on circular piezoelectric energy harvester

Abstract

A piezoelectric energy harvester for broadband rotational excitation using buckled beam AIP Advances 8, 015125 (2018) A new stress-applied mode is proposed on piezoelectric circular diaphragm energy harvester. Differing from the usual mode used in previous researches, the mass stick at the center of the diaphragm (PZT-51) is designed into an annular hollow shape. In this case, stress of the mass is applied along the edge of the copper sheet. A screw bonded with the undersurface of the diaphragm transfers force from the vibrator to the diaphragm. This device has a cylindrical shape and its volume is ∼7.9 cm 3 . With this new stress-applied mode, the piezoelectric energy harvester (with an optimal load of 18 kΩ, a mass of 30 g) could generate a maximum power output of ∼20.8 mW under 9.8 m·s -2 at its resonant frequency of ∼237 Hz. Meanwhile, the greater the hardness ratio between the ceramic and the copper sheet, the greater the advantages of the new structure. © 2018 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license

Design of Two-Stage Force Amplification Frame for Piezoelectric Energy Harvester

“…Piezoelectric material will convert these mechanical factors to electrical power [2]. Therefore, if the mechanical energy of human footsteps can be successfully converted into useful electrical energy, it will benefit energy conservation and reduce emissions [3]. Research on piezoelectric energy harvesting has been conducted extensively in various applications, including structural condition monitoring, implanted biomedical devices, rain energy harvesting, vibration-based harvesting, and other electronic devices [4]- [8].…”