• Title, Summary, Keyword: Multilayer piezoelectric transformer

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Electrical Properties of High Power Step Down Multilayer Piezoelectric Transformer using Low Temperature Sintering PMN-PNN-PZT Ceramics (저온소결 PMN-PNN-PZT 세라믹스를 이용한 고출력 강압용 적층 압전변압기의 전기적 특성)

  • Yoo, Ju-Hyun;Kim, Kook-Jin;Paik, Dong-Soo;Yoon, Hyun-Sang
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.20 no.4
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    • pp.332-336
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    • 2007
  • In this study, multilayer piezoelectric transformer was manufactured using the PMN-PNN-PZT ceramic and then the electrical characteristics were investigated according to the variations of frequency and load resistance. The voltage step-up ratio of multilayer piezoelectric transformer showed the maximum value at the vicinity of 75 kHz and increased according to the increase of load resistance. When the output impedance coincided with the load resistance, the multilayer piezoelectric transformer showed the temperature rise of less than $20^{\circ}C$ at the output power of 20 W. As the results, the multilayer piezoelectric transformer manufactured at low co-firing temperature of $940^{\circ}C$ using PMN-PNN-PZT ceramics could be stably driven as the step-down transformers.

Electrical Properties of Thickness-Vibration-Mode Multilayer Piezoelectric Transformer using Low Temperature Sintering (Pb,Ca,Sr,)(Ti,Mn,Sb)O3 Ceramics (저온소결 (Pb,Ca,Sr,)(Ti,Mn,Sb)O3 세라믹스를 이용한 두께진동모드 적층 압전 변압기의 전기적 특성)

  • Yoo, Ju-Hyun;Yoo, Kyung-Jin;Kim, Do-Hyung
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.20 no.11
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    • pp.948-952
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    • 2007
  • In this study, a low temperature sintering multilayer piezoelectric transformer for a DC-DC converter was manufactured using $(Pb,Ca,Sr,)(Ti,Mn,Sb)O_3$ ceramics. Its electrical properties were investigated according to the variation in frequency and load resistance. The voltage step-up ratio of the multilayer piezoelectric transformer showed a maximum value at a resonant frequency of input part and increased with an increase of load resistance. The efficiency of the multilayer piezoelectric transformer showed the highest value at a load resistance of 17 $\Omega$. The output power was increased with increasing input voltage. Temperature increase of the multilayer piezoelectric transformer was increased with the increase of output power. At the load resistance of 17 $\Omega$, the multilayer piezoelectric transformer showed the temperature rises of about $20^{\circ}C$ at the output power of 18 W, and stable driving characteristics.

Fabrication and electrical properties of Rosen-type multilayer piezoelectric transformer (Rosen type 적층형 압전변압기의 제작 및 전기적 특성)

  • Lee, Chang-Bae;Yoon, Jung-Rag;Lee, Kyung-Min;Woo, Byung-Chul
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.250-250
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    • 2007
  • In this paper, multilayer piezoelectric transformer for high power is presented. This piezoelectric transformer, with a multilayered construction in the thickness direction, was fabricated at the sintering temperature of $1055^{\circ}C$. The electrical properties of multilayer piezoelectric transformer as a function of Internal electrode structure, with same size, were investigated. Also, the multilayer piezoelectric transformer with different layer number of 5, 10, 15 layers, were investigated.

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The Electrical Properties of Multilayer Piezoelectric Transformer using PZN-PMN-PZT ceramics (PZN-PMN-PZT 세라믹스를 이용한 적층 압전변압기의 전기적 특성)

  • Kim, Kook-Jin;Lee, Chang-Bae;Yoo, Ju-Hyun;Paik, Dong-Soo;Yoon, Hyun-Sang
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.301-303
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    • 2006
  • In this study, multilayer piezoelectric transformer were manufactured using the PZN-PMN-PZT ceramic and then the electrical characteristics were investigated. The voltage step-up ratio of multilayer piezoelectric transformer showed the maximum value in the vicinity of 78.16kHz and increased according to the increase of load resistance. When the output impedance coincided with the load resistance, piezoelectric transformer showed the temperature increase of about $20^{\circ}C$ at the output power of 12W. The results, the multilayer transformer manufactured using the low temperature sintered PZN-PMN-PZT ceramics can be stably driven for step-up transformers.

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Design and FEM Analysis of Multilayer Piezoelectric Transformer for AC-adapter (AC-adapter를 위한 적층형 압전트랜스포머의 설계 및 유한요소해석)

  • 정현호
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.529-533
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    • 2000
  • This paper present a new sort of multilayer piezoelectric ceramic transformer for AC-adapt. This piezoelectric transformer operates n the second thickness extensional vibration mode. The output voltage of the multilayer piezoelectric transformer was simulated using ANSYS. As results, the maximum stress appeared at the two points where one is the middle of input and the other is middle of output side in Second thickness extensional vibration mode. And output voltage was inversely decreased by increasing number of output layers.

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The Electrical Properties of Thickness Vibration Mode Multilayer Piezoelectric Transformer using (PbCaSr)(TiMnSb)$O_3$ Ceramics ((PbCaSr)(TiMnSb)$O_3$ 세라믹스를 이용한 두께진동모드 적층 압전 변압기의 전기적 특성)

  • Yoo, Kyung-Jin;Yoo, Ju-Hyun;Jeong, Yeong-Ho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.196-197
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    • 2006
  • In this study, low temperature sintering multilayer piezoelectric transformer for DC-DC converter were manufactured using (PbCaSr)Ti(MnSb)$O_3$ ceramics and thin their electrical properties were investigated according to the vanation of frequency and load resistance. The voltage step-up ratio of multilayer piezoelectric transformer showed the maximum value m the vicinity of 1.3MHz and increased according to the increase of load resistance. When the output impedance coincided with the load resistance, the piezoelectric transformer showed the temperature rise of about $21^{\circ}C$ under the output power of 6W.

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Modeling and Investigation of Multilayer Piezoelectric Transformer with a Central Hole for Heat Dissipation

  • Thang, Vo Viet;Kim, In-Sung;Jeong, Soon-Jong;Kim, Min-Soo;Song, Jae-Sung
    • Journal of Electrical Engineering and Technology
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    • v.6 no.5
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    • pp.671-676
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    • 2011
  • A multilayer square-type piezoelectric transformer with a hole at the center was investigated in this paper. Temperature distribution at the center was improved by using this construction, therefore increasing input voltage and output power. This model was simulated and investigated successfully by applying a finite element method (FEM) in ATILA software. An optimized structure was then fabricated, examined, and compared to the simulation results. Electrical characteristics, including output voltage and output power, were measured at different load resistances. The temperature distribution was also monitored using an infrared camera. The piezoelectric transformer operated at first radial vibration mode and a frequency area of 70 kHz. The 16 W output power was achieved in a three-layer transformer with 96% efficiency and $20^{\circ}C$ temperature rise from room temperature under 115 V driving voltage, 100 ${\Omega}$ matching load, $28{\times}28{\times}1.8mm$ size, and 2 mm hole diameter. With these square-type multilayer piezoelectric transformers, the temperature was concentrated around the hole and lower than in piezoelectric transformers without a hole.

The Effect of Piezoelectric Properties on the Output Properties of Step-down Multilayer Piezoelectric Transformer (압전특성이 강압용 적층 압전변압기의 출력특성에 미치는 영향)

  • Kim, Kook-Jin;Yoo, Ju-Hyun;Paik, Dong-Soo;Yoon, Hyun-Sang
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.225-227
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    • 2006
  • Multilayer step down piezoelectric transformers were manufactured using PZN-PMN-PZT and PMN-PNN-PZT ceramics respectively. Sintering temperature of the ceramics was $940^{\circ}C$. And then. their electrical properties were investigated according to the variations of frequency and load resistance. The voltage step-up ratio of multilayer piezoelectric transformer showed the maximum values in the vicinity of 69 and 71kHz, respectively. At the load resistance of $100{\Omega}$, the piezoelectric transformers showed the temperature rises of about 21 and $18^{\circ}C$ at the output power of 15W and 18W, respectively. At the transformer with high effective electromechanical coupling factor($k_{eff}$), lower temperature increase was appeared.

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Electrical Properties of Multilayer Piezoelectric Transformer using PMN-PZN-PZT Ceramics (PMN-PZN-PZT 세라믹스를 이용한 적층형 압전변압기의 전기적 특성)

  • Lee, Chang-Bae;Yoo, Ju-Hyun;Paik, Dong-Soo;Kang, Jin-Kyu;Cho, Hong-Hee;Lee, Sung-Ill
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.19 no.7
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    • pp.655-661
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    • 2006
  • Dielectric and piezoelectric properties of PMN-PZT ceramics with a high mechanical quality factor$(Q_m)$ and a low temperature sintering temperature were investigated as a function of PZN substitution in order to develop multilayer piezoelectric transformer for AC-DC converter. Multilayer piezoelectric transformers were subsequently manufactured using the PMN-PZN-PZT ceramic offering the optimal behavior and then the electrical performance were invetigated. At the sintering temperature of $940^{\circ}C$, density, electromechanical coupling factor$(k_p)$, mechanical qualify factor$(Q_m)$ and dielectric constant$(\varepsilon_r)$ of 8 mol% PZN substituted specimen were $7.73g/cm^3$, 0.524, 1573 and 1455, respectively. The PZN substitution caused a increase in the dielectric constant and the electromechnical coupling factor. The voltage step-up ratio of multilayer piezoelectric transformer showed the maximum value at near the resonant frequency of 76.55 kHz and increased according to the increase of load resistance. The multilayer piezoelectric transformer with the output impedance coincided with the load resistance showed the temperature increase of less than $20^{\circ}C$ at the output power of 10 W. Based on the results, the manufactured multilayer transformer using the low temperature sintered PMN-PZN-PZT ceramics can be stably driven for both step-up and down transformers.

Characteristics of A Multilayer Piezoelectric Transformer Using PAN-PZT Ceramics (PAN-PZT계 세라믹스를 이용한 적층형압전변압기의 특성)

  • 박타리;이동균;최지원;신용덕;김현재;고태국;윤석진
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.143-146
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    • 2002
  • The characteristics of a multilayer piezoelectric transformer were investigated using 0.05Pb(A $l_{0.5}$N $b_{0.5}$) $O_3$-0.95Pb(Z $r_{0.52}$ $Ti_{0.48}$) $O_3$+0.9wt%N $b_2$ $O_{5}$+0.5wt%Mn $O_2$+0.04wt% $V_2$ $O_{5}$ ceramics. The multilayer piezoelectric trans formers were developed for voltage step-up. The multilayer ceramic technology was applied in piezoelectric transformer. The electrical characteristics of the piezoelectric transformer (33x8.5x1mm) has the efficiency of above 85%, step-up ratio of 70 under the 130 kΩ load, and driving frequency of 93.5kHz, respectively.ctively.y.y.

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