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김정훈(Jeong Hun Kim),황성주(Sung Joo Hwang),안정환(Jung Hwan Ahn),홍성광(Seong Kwang Hong),김선중(Sun Jung Kim),송예원(Yewon song),성태현(Tae Hyun Sung) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
Nowadays, enhancement of output power of piezoelectric energy harvesting is actively conducted. We study strain of piezoelectric energy harvester induced by magnets. We supply constant input using a function generator and a vibration exciter. Under a constant mechanical vibration input, we match impedance between piezoelectric material and the load resistor. Thereafter we measure electrical output of piezoelectric cantilever beam. We measure the resonance frequency and the output voltage of an open circuit while the distance between the magnets changes; 2, 5, 8, 10, 15 mm. As the distance between the magnets decreases it shows a higher resonance frequency and output voltage. In the case of an open circuit and vibration frequency of 71 Hz, output voltage was measured 16.6 Voc. Load impedance was matched at 17 kΩ, in such conditions the output voltage and power were measured to be 10.9 Vrms and 6.98 mW.