• Title/Summary/Keyword: Piezoelectric

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Electrical Characteristics of Step-down Piezoelectric Transformer (강압용 압전변압기의 전기적 특성)

  • 신훈범;유영한;안형근;한득영
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.07a
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    • pp.389-392
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    • 2001
  • In this paper, we have explained electrical characteristics of a step-down Rosen type piezoelectric transformer for AC-adapter. When the electric voltage is applied to the driving piezoelectric vibrator polarized in the longitudinal direction, then output voltage is generated at the generating piezoelectric vibrator polarized in the thickness direction due to the piezoelectric effects. Output voltage and current from a 11-layered and a 13-layered piezoelectric transformer were measured under the various conditions of loads and frequencies. We measured resonant frequency from impedance curve. It was shown from experiments that output voltage has increased and resonant frequency has changed according to various resistor loads. Output current has changed inversely proportional to resistances.

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Design and Manufacture of Step-down Piezoelectric Transformers Multi-layered by Ceramic Sheets (적층형 압전세라믹을 이용한 강압용 압전변압기의 설계 및 제조)

  • 정현호;이원재;김인성;송재성;박태곤
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.07a
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    • pp.680-683
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    • 2001
  • The output characteristics of step-down piezoelectric transformer is changed by a structure of layers. In this paper, we simulated output characteristics of multi-layer piezoelectric transformers with variation of output layers. Also, fabricated piezoelectric transformers were compared with simulated data. From simulated piezoelectric transformers, the output voltage decreased with increasing number of layers. From these results, piezoelectric transformers were made and the output electrical power of the transformers was measured at resonance frequency and at other frequency. The electrical power of transformers was measured on each transformer's resonance mode. However, measured value of 12-layed transformer's output power was smaller than that of 6-layered transformer's one. It is supposed that internal capacitance and reactance of the piezoelectric transformer's were effected in this result. Therefore we need to connect other road resistance and capacitance in output circuit, in order to increase electrical power of transformers.

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A study on characteristics of piezoelectric fan in PZN-PZ-PT ceramics (PZN-PZ-PT 세라믹스 압전팬의 특성에 관한 연구)

  • 최형욱;백동수;윤현상;이두희;김규수;박창엽
    • Electrical & Electronic Materials
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    • v.8 no.1
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    • pp.1-5
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    • 1995
  • In this study, a piezoelectric fan was fabricated using piezoelectric element of 0.13PZN-0.41PZ-0.46PT prepared by extruding method. The sizes of the piezoelectric element and the piezoelectric fan were adjust to utilize commercial ac source(100V, 6OHz). The size of the piezoelectric element was $0.26{\times}19.5{\times}45$mm and the resonant frequency and the electromechanical coupling coefficient were 31.26KHz, 31.58% respectively. The size of the piezoelectric fan was $0.62{\times}19.5{\times}78.5$mm and the maximum displacement was 40mm.

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Process and Electrical Characteristics of Step-down Piezoelectric Transformers (강압용 압전변압기 제작 및 전기적특성)

  • Kwon, Ju-Nam;Shin, Hoon-Bum;Han, Deuk-Young;Ahn, Hyung-Keun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.07b
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    • pp.595-598
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    • 2004
  • We have explained Process and electrical characteristics of a step-down Rosen type piezoelectric transformer for AC-adapter. When the electric voltage is applied to the driving piezoelectric vibrator notarized in the thickness direction, then output voltage is generated at the generating piezoelectric vibrator polarized in the thickness direction due to the piezoelectric effects. Output voltage and current from a single-layered piezoelectric transformer were measured under the various condition of loads and frequencies It was shown from experiments that output voltage has increased and resonance frequency has changed according to various resistor loads. Output current has decreased inversely proportional to the loads

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Piezoelectric and Electrical properties of KNN ceramics as a function of the Variation of Nb (Nb 변화에 따른 KNN 세라믹스의 압전 및 전기적 특성)

  • Lee, Kba-Soo;Yoo, Ju-Hyun;Kim, In-Sung;Song, Jae-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2010.06a
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    • pp.302-302
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    • 2010
  • The lead-free piezoelectric ceramics must have high piezoelectric properties and electrical properties for the applications of piezoelectric devices. Therefore, KNN ceramics were investigated as a function of the variation of Nb. The density was increased with the increase of Nb. The density was saturated above 0.8895 mol Nb. The maximum value of electromechanical coupling coefficient(kp) was obtained 0.428 at 0.8895mol Nb. This result can be attributed to the well sintered of specimens. Also, The maximum value of mechanical quality factor(Qm) showed 1554 at 0.8895mol Nb. Therefore, this composition can be used for application of piezoelectric device such as piezoelectric transformer and piezoelectric actuator.

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Trajectory of Resonant Displacement of Coupled Vibration Mode Piezoelectric Devices for AE Sensor Application (음향방출 센서 응용을 위한 결합진동 모드 압전소자의 공진 변위 궤적)

  • Jeong, Yeong-Ho;Shin, Sang-Hoon;Yoo, Ju-Hyun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.26 no.2
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    • pp.114-118
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    • 2013
  • In this study, coupled mode piezoelectric devices for AE sensor application with excellent displacement and piezoelectric characteristics were simulated using ATILA FEM program, and then fabricated. Displacements and electromechanical coupling factors of the piezoelectric devices were investigated. The simulation results showed that excellent displacement and electromechanical coupling factor were obtained when the ratio of diameter/thickness was 1.0. The piezoelectric device of ${\Phi}/T$= 1.0 exhibited the optimum values of fr= 406 kHz, displacement= $6.11{\times}10^{-8}[m]$, $k_{eff}$= 0.648. The results show that the coupled vibration mode piezoelectric device is a promising candidate for the application of AE sensor piezoelectric device.

Process Improvement of PCB Electric Circuit Pattern by Ink Drop Jetting Control and Characteristics Analysis of Industrial Inkjet Piezoelectric Print Head (산업용 잉크젯 압전프린트 헤드의 특성해석 및 잉크 망점제어에 의한 PCB 전기회로패턴 공정개선)

  • Youn, Shin-Yong
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.65 no.1
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    • pp.57-65
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    • 2016
  • This paper was analyzed the characteristics of piezoelectric inkjet print head using finite element method(FEM). It showed the bending node driving of piezoelectric and relation theory principle consider piezoelectric material characteristics and ink characteristics. From such result we were had the piezoelectric head design and manufacture. It got a this head characteristics through experiment, we confirmed that proper voltage control is possible to through ink drop control experiment of piezoelectric print head. This paper was obtained the suitable ink jetting characteristics that manufacture the control circuit and piezoelectric inkjet print head. This practice product was applied to improvement of PCB electric circuit pattern by etching resist ink that PCB manufactured to complex process over traditional 6 stages can be simpled to 1 stage by inkjet printing technology.

Finite Element Modeling for Free Vibration Control of Beam Structures using Piezoelectric Sensors and Actuators (압전감지기와 압전작동기를 이용한 보구조물의 자유진동제어에 대한 유한요소 모형화)

  • 송명관;한인선;김선훈;최창근
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2003.04a
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    • pp.269-278
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    • 2003
  • In this study, the method of the finite element modeling for free vibration control of beam-type smart structures with bonded plate-type piezoelectric sensors and actuators is proposed. Constitutive equations for the direct piezoelectric effect and converse piezoelectric effect of piezoelectric materials are considered. By using the variational principle, the equations of motion for the smart beam finite element are derived, The proposed 2-node beam finite element is an isoparametric element based on Timoshenko beam theory. Therefore, by analyzing beam-type smart structures with smart beam finite elements, it is possible to simulate the control of the structural behavior by applying voltages to piezoelectric actuators and monitoring of the structural behavior by sensing voltages of piezoelectric sensors. By using the smart beam finite element and constant-gain feed back control scheme, the formulation of the free vibration control for the beam structures with bonded plate-type piezoelectric sensors and actuators is proposed.

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Influence of Effective Piezoelectric Properties on Performance of Piezoelectric Accelerometer for Vibration Measurements (진동 측정용 압전형 가속도센서의 압전특성 효과)

  • 권정락
    • Journal of the Korean Ceramic Society
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    • v.32 no.8
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    • pp.945-949
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    • 1995
  • In order to investigate the performance of compression-type accelerometer on piezoelectric properties, PZT materials have been studied. The ring-shaped piezoelectric elements were prepared using commercial PZT powders by conventional ceramic process. Their estimated relative dielectric constant, piezoelectric charge constant (d33) and voltage constant (g33) values showed 390∼3400, (90∼593)×10-12 C/N and (19.5∼40.5)×10-3 V-m/N, respectively. The charge sensitivity of accelerometer is proportional to the piezoelectric charge constant value (d33) of PZT, but its voltage sensitivity is related with the piezoelectric voltage constant (g33). Since the mounted resonance frequency and sensitivity are dependent on the seismic mass as well as physical charateristics and size of PZT elements, the suitable considerations between two components are required for accelerometer's design.

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Finite Element Analysis of A Piezoelectric Actuator (압전 작동기 거동해석을 위한 유한요소 모사)

  • Lee, Heung-Shik;Cho, Chong-Du
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.1401-1406
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    • 2003
  • Mechanical behavior of a piezoelectric actuator is studied as a preceding research for the manufacturing of three-dimensional micro-structures. It is needed to examine the simulation of a piezoelectric actuator according to applied direction of voltage, by researching displacement characterization of piezoelectric material through piezoelectric theory. To this end, finite element modeling is employed to study the response of a piezoelectric material under the various input voltages. Where the actuator is simulated by use of ANSYS. To avoid direct contact piezoelectric material with working fluid, silicon, polymer, etc., the actuator is modeled with nickel fixed diaphragm.

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