• Title, Summary, Keyword: 압전소자

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Development of Convergence LED Streetlight and Speed Bump Using Solar Cell and Piezoelectric Element (태양광과 압전소자를 이용한 융복합 LED 발광 과속방지턱 겸용 가로등 개발)

  • Nahm, Eui-Seok;Cho, Han-Jin
    • Journal of Digital Convergence
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    • v.14 no.5
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    • pp.325-331
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    • 2016
  • In driving at evening or night, we are not able to recognize the speed bump and so stop suddenly. It could result in accidents. And also, we have a restriction of street light installation in farm road because it could be harmful to the crops and driver could not recognize the walking people. It needs to develop the speed bump with light and streetlight to be non harmful to the crops. So, we develop both the speed bump and streetlight with LED which could be non harmful to the crops and be increased recognition of walking people in farm road. For LED lighting power, we use the solar cells, and piezoelectric elements. It has automatic on/off according to power saving rates without illumination sensor. Minimization of circuit elements and design of minimum resisters and low power LED was used for power saving in assuring 3-days.

Optical tunable wavelength add/drop multiplexer employing piezoactuated fiber Bragg gratings for WDM system (압전 소자형 광섬유 격자 소자를 이용한 파장 분할 다중화 시스템용 파장 가변형 광 분기/결합 장치)

  • Kim, Se-Yoon;lee, Sang-Bae;Choi, Sang-Sam;Chung, Joon;Jeong, Ji-Chai
    • Korean Journal of Optics and Photonics
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    • v.8 no.4
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    • pp.340-344
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    • 1997
  • We proposed and demonstrated a tunable wavelength optical add/drop multiplexer(OADM) employing piezoactuated fiber grating pairs and polarization beam splitters. We used piezostack act as a fiber stretcher, using the fact that the resonant wavelength of the grating can be controlled by the axial strain along the fiber grating. The polarization controlled configuration showed high stability because the reflected signals from the two identical gratings are dropped or added not by interference but by polarizations of the beams. We could add and drop not noly 1549.3nm signal channel(original gratings), but also 1550.1nm(tuned gratings) with PZT actuators and in both cases, we found that the rejection of adjacent channels was more than -26dB, and signal leakage at the gratings was less than -34dB.

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A study on the Electrical Characteristics of piezoelectric Ceramics Used In Ultrasonic Trasmitting Sensor by Ba Substitution (Ba 치환에 의한 초음파 송신기용 압전 소자의 전기적 특성에 관한 연구)

  • 조봉희;최창규;박창규;박상만
    • Electrical & Electronic Materials
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    • v.3 no.1
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    • pp.20-28
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    • 1990
  • Pb(Zr, Ti)O$_{3}$-Pb(Ni, Nb)O$_{3}$계 세라믹스에 Ba를 치완시켜 Ba치환량의 증가에 따른 유전율, 전기기계결합계수 및 압전 d정수의 변화를 고찰하였다. 또한 Ba치환에 따른 세라믹스 소자의 송신감도 특성을 조사하고 큐리온도 이동에 따른 온도안정성을 고려하여 초음파 송신기용 압전소자에 응용가능함을 보였다.

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Modeling and Experiment of Energy Harvester Using a Piezoelectric Element (압전소자를 이용한 에너지 하베스터 모델링 및 실험)

  • Cho, Sungwoo;An, Hyunsung;Kim, Young-Cheol;Lee, Hanmin;Seo, Jong Ho;Cha, Hanju
    • Proceedings of the KIPE Conference
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    • pp.227-228
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    • 2016
  • 본 논문에서는 압전소자를 이용한 에너지 하베스터의 전기적 모델링을 제안하였고 이를 시뮬레이션 및 실험을 통해 비교 분석하였다. 에너지 하베스터는 압전소자를 이용한 발전기, 풀브리지 정류기, 평활용 콘덴서, 부하로 구성된다. 본 논문에서는 에너지 하베스팅 방법으로 Standard AC 방법과 이에 풀브리지 정류기를 추가한 Standard DC 방법을 사용하였고 전기적 모델링, 시뮬레이션, 실험의 분석을 위해 압전 발전기를 RLC 등가모델로 구성하였다. 에너지 하베스터 실험장치를 구성하였으며, 두 가지의 전력변환 기법 각각 $73.7{\mu}W$, $69.3{\mu}W$를 하베스팅 하는 것을 확인하였다.

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능동형 진동 절연을 위한 압전 구동기의 보상기 설계

  • 문준희;박희재
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.198-198
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    • 2004
  • 압전 구동기는 여러 가지 적용에 있어서 높은 응답 속도와 큰 힘, 작은 크기 둥의 장점을 가지고 미세 구동에서 독보적인 위치를 차지하고 있다. 하지만, 히스테리시스, 크? 등의 압전 소자 자체의 비선형성과 이의 구동을 위한 증폭기 등의 한계로 압전 소자의 동적인 특성은 비교적 열악한 것으로 알려져 있다. 특히, 구동 속도가 빨라질 수록 히스테리시스 곡선의 모양이 달라게 되어 구동 궤적의 정확한 예측이 어려우며, 증폭기의 최대 발생 전류가 충분치 않을 경우 압전 구동기가 지령치를 따르지 못하게 된다.(중략)

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Piezoelectric Properties of Lead-Free $(Na_xK_{0.94-x}Li_{0.06})NbO_3$ Ceramics ($(Na_xK_{0.94-x}Li_{0.06})NbO_3$ 세라믹스의 압전 및 유전 특성)

  • Jeon, So-Hyun;Kim, Min-Soo;Park, Jeong-Joo;Jeong, Soon-Jong;Kim, In-Sung;Song, Jae-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.276-276
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    • 2007
  • As a candidate for lead-free piezoelectric materials, dense $(Na_xK_{0.94-x}Li_{0.06})NbO_3$ ceramics were developed by conventional sintering process. Sintering temperature was lowered by adding 1 mol% $Li_2O$ as a sintering aid. The electrical properties of $(Na_xK_{0.94-x}Li_{0.06})NbO_3$ ceramics were investigated as a function of Na/K ratio. When the sample sintered at $950^{\circ}C$ for 4 h with the compositions of morphotropic phase boundary, 0.47 < x < 0.51, electro-mechanical coupling factor ($k_p$) and piezoelectric coefficient ($d_{33}$) were found to reach the highest values of 0.42 and 190 pC/N, respectively. These excellent piezoelectric and electro-mechanical properties indicate that this system is potentially good candidate for lead-free material for a wide range of electro-mechanical transducer applications.

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Transparent and flexible nanogerator based on ZnO nanowires (산화아연 나노선 기반의 투명하고 유연한 나노발전소자)

  • Choi, Min-Yeol;Oh, Yeong-Hwan;Lee, Do-Kyeong;Kim, Sang-Woo;Kim, Sung-Jin
    • 한국신재생에너지학회:학술대회논문집
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    • pp.626-626
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    • 2009
  • 외부의 전기적인 에너지원 없이 기계적인 힘에 의해 구동되는 투명하고, 유연한 에너지 발생 압력센서를 제작하기 위하여 일차원 산화아연 나노선 기반의 압전소자를 제작하였다1). 산화아연 나노선은 유연한 플라스틱 기판에 습식화학 방법을 이용하여 성장시켰다. 이 방법은 간단한 공정과, 저온 성장공정, 대면적 성장, 대량생산이 가능한 방법이다. 산화아연 나노선의 끝 부분과의 접촉을 위한 상부 전극으로는 PdAu 와 ITO가 증착된 유연한 플라스틱 기판을 사용하였다. 90 % 이상의 높은 투과율을 가진 산화아연 나노선과 ITO 상부전극을 이용하여 투명하고 유연한 에너지 발생소자를 제작하였다. 이를 이용하여 외부에서 작용하는 힘,상부전극의 형상 및 일함수와 나노발전소자의 출력과의 상관관계를 조사하였다. 제작된 투명하고 유연한 나노발전소자의 경우 0.9 kgf에서 1A/$cm^2$ 의 전류가 발생한 것을 확인하였다.

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Design of a Vibration Energy Harvesting Circuit With MPPT Control (MPPT 제어 기능을 갖는 진동에너지 하베스팅 회로 설계)

  • Park, Joon-Ho;Yoon, Eun-Jung;Park, Jong-Tae;Yu, Chong-Gun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.15 no.11
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    • pp.2457-2464
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    • 2011
  • In this paper, a vibration energy harvesting circuit using a piezoelectric device is designed. MPPT(Maximum Power Point Tracking) control function is implemented using the electric power-voltage characteristic of a piezoelectric device to deliver the maximum power to load. The designed MPPT control circuit traces the maximum power point by periodically sampling the open circuit voltage of a full-wave rectifier circuit connected to the piezoelectric device output and delivers the maximum available power to load. The proposed vibration energy harvesting circuit is designed with $0.18{\mu}m$ CMOS process. Simulation results show that the maximum power efficiency of the designed circuit is 91%, and the chip area except pads is $700{\mu}m{\times}730{\mu}m$.

Reduction Method of Acoustic Vibrating Plate Using Piezo Electric Material (압전 소자를 이용한 음향 진동 박판에 대한 제어 기법)

  • Jung, Do-Hee;Park, Seen-Ok;Kim, Woo-Young;Lee, Sang-Kee
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.13 no.10
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    • pp.777-784
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    • 2003
  • Acoustic response control of a corner-pinned plate using piezoelectric wafers was studied, both theoretically and experimentally Three different sizes of aluminum alloy plates were used and available ball joints were employed to hold the plate at the four corners. The plate with the largest aspect ratio showed the largest and most clear responses to the acoustic excitation in the range of frequencies (0∼200 Hz), and sound pressure levels (80∼100 dB) as predicted. The reduction of the acoustic response of the plate by piezoelectric actuator was very significant, more than expected, but abatement of the sound transmission through the plate was only slightly altered by the piezoelectric actuator. This work is an original work extending earlier work with doors excited by acoustic fields. The important difference is the used of ball joints to simulate the joints.