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Hyeonkyu Joo,김인성,Jaesung Song,정순종,Minsoo Kim 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.1
The influences of the sintering temperature on the microstructures, piezoelectric, and dielectric properties of PNN-PMN-PZT ceramics and on the method for fabricating of high-power Rosen-type piezoelectric transformers were investigated. The basic composition of piezoelectric ceramics was ternary 0.01Pb(Ni1/3Nb2/3)O3 - 0.08Pb(Mn1/3Nb2/3)O3 - 0.91Pb(Zr0.505Ti0.495)O3 (abbreviated as PNN-PMN-PZT). The density and the microstructures, dielectric and piezoelectric properties as functions of the sintering temperature were investigated. The results indicated that the optimized properties of the ceramics were obtained at a sintering temperature of 1200 ℃: d33 = 273 pC/N,Kp = 0.60, Qm = 1585,∈r = 1454, density = 7.917 g/cm3 and tan∂ = 0.0064. Piezoelectric transformers were manufactured using the PNN-PMN-PZT ceramics. The voltage step-up ratio of the piezoelectric transformers showed maximum values near 81 kHz and increased with increasing load resistance. The piezoelectric transformers sintered at 1200 ℃also showed favorable characteristics with a higher step-up ratio and a lower temperature rise of 3.2 ℃at an output power of 5 W.
Sr이 치환된 Rosen 타입 압전변압기의 전기적 특성
주현규(Hyeonkyu Joo),김인성(Insung Kim),정순종(Soonjong Jeong),김민수(Minsoo Kim),송재성(Jaesung Song),이대수(Daesoo Lee),전소현(Sohyeon Jeon) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Recently, piezoelectric transformer is applied to wide fields. Multi layer piezoelectric transformer has the advantage of high step up ratio, high electromechanical coupling coefficient(Kp) and high mechanical quality factor(Qm), however it shows the peeling-phenomenon of electrode, and high price due to high sintering temperature. Therefore this study focus on the method for fabrication of high power rosen type piezoelectric transformers.
Micro Power Generation of a PMN-PZT Triple-morph Cantilever for Electric Harvesting Devices
김인성,Hyeonkyu Joo,정순종,Minsoo Kim,Jaesung Song 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.1
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 , 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.
3-1 타입 트리모프 캔틸레버의 마이크로발전 응용기술 개발
김인성(Insung Kim),주현규(Hyeonkyu Joo),정순종(Soonjong Jeong),김민수(Minsoo Kim),송재성(Jaesung Song),전소현(Sohyeon Jeon) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
With recent advanced in portable electric devices, wireless sensor, MEMS and bio-Mechanics device, the new typed power supply, not conventional battery but self-powered energy source is needed. Particularly, the system that harvests from their environments are interests for use in self powered devices. For very low powered devices, environmental energy may be enough to use power source. Therefore, in other to made piezoelectric energy harvesting device. The made 31type triple-morph cantilever was resulted from the conditions of 100㏀, 0.25g, 154㎐ respectively. The thick film was prepared at the condition of 6.57Vrms, and its power was 432.31㎼ and its thickness was 50㎛. And than, the fabricated piezoelectric cantilever was packaged for application.