Energy Harvesting Devices Utilizing Resonance Vibration of Piezoelectric Buzzer

Abstract

A piezoelectric buzzer for energy harvesting was investigated. Although an external force was added to a buzzer, a lead zirconate titanate (PZT) unimorph in the buzzer, the ceramic disc diameter, thickness, and capacitance of which were respectively 14 mm, 0.2 mm, and 10 nF, generated resonance vibration. As a result, alternating voltages of around 30 V and a frequency of 5 kHz were observed. When the generated voltages were applied to a LED lamp, new devices such as a “night-view footwear” and a “piezo-walker” were developed. It was confirmed that the piezo-buzzer for energy harvesting utilizing resonance vibration is an effective tool for obtaining clean energy.