Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
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Micro Power Generation of a PMN-PZT Triple-morph Cantilever for Electric Harvesting Devices

Kim, In-Sung;Joo, Hyeon-Kyu;Jeong, Soon-Jong;Kim, Min-Soo;Song, Jae-Sung

  • Published : 20100100
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Abstract

A piezoelectric cantilever was manufactured using a PMN-PZT thick film for an electric harvesting device. In order to find better properties, we manufactured the piezoelectric cantilever in two forms (bi-morph and triple-morph); then, the bi-morph cantilever and the triple-morph cantilever were compared as to electric micro power. The generation characteristics were investigated at various frequencies, load resistances, and masses. The output power of the bi-morph piezoelectric cantilever showed a maximum value at 0.25 g mass at 197 Hz, and the triple-morph piezoelectric cantilever showed a maximum at 0.25 g mass at 154 Hz. The piezoelectric cantilever output voltage increased with the increasing load resistance, and the output power quality was investigated by changing the load resistance, the mass, and the frequency. The bi-morph piezoelectric cantilever's output power at 33 k$\Omega$, 0.25 g, and 197 Hz was 0.23 mW at 2.75 Vrms, and the average micro power from the triple-morph piezoelectric cantilever was 0.432 mW at 6.57 Vrms and 154 Hz.

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