사다리꼴 PZT/Ag Laminate 외팔보 발전기의 압전 에너지 하베스팅 특성

The piezoelectric energy harvesting characteristics of a trapezoidal cantilever generator with lead zirconate titanate (PZT) laminate were investigated with various Ag inner electrodes. The piezoelectric mode of operation was a transverse mode by using a planar electrode pattern. The piezoelectric cantilever generator was fabricated using trapezoidal cofired-PZT/Ag laminates by five specimens of 2, 3, 4, 7, and 13 layers of Ag. As the number of Ag electrodes increased, impedance and output voltage at resonant frequency significantly decreased, and capacitance and output current showed an increasing tendency. A maximum output power density of 7.60 mW/cm3 was realized for the specimen with seven Ag layers in the optimal condition of acceleration (1.2 g) and resistive load (600 Ω), which corresponds to a normalized power factor of 5.28 mW/g2·cm3.