The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Fontes de alimentação inversoras de baixo perfil são cada vez mais necessárias para sistemas de retroiluminação de telas de cristal líquido (LCDs). Muita atenção tem sido dada à aplicação de transformadores piezoelétricos (TPs) a tais fontes de alimentação. Para miniaturizar ainda mais os inversores PT, os TP precisam ter uma taxa de aumento de tensão suficientemente alta, o que pode ser alcançado por um TP multicamadas. Primeiro, este artigo descreve um método para simular tal desempenho usando um modelo de circuito equivalente constante distribuído. Os resultados da simulação para um TP multicamadas operado no modo de vibração longitudinal de terceira ordem mostram que a resistência dos eletrodos internos causa o fator de perda dominante. Em seguida, foi fabricado um inversor de potência incorporando o PT multicamadas. Este inversor de potência pode ser operado em uma ampla faixa de tensão CC de entrada de 7 a 20 V. Em relação a um circuito de acionamento de inversor convencional, quando a faixa de tensão CC de entrada foi estendida, a eficiência do inversor diminuiu notavelmente. Por esse motivo, desenvolvemos um novo circuito inversor, que é equipado com um circuito de controle automático da tensão de acionamento para manter a tensão de acionamento para o TP em um valor constante. Como resultado, o inversor de potência fabricado exibiu mais de 90% de eficiência geral e potência de saída de 3.5 W, o que é suficiente para iluminar um LCD colorido de 12.1 polegadas. A eficiência máxima de luminância em uma placa de transmissão de luz da luz de fundo chegava a 30 cd/m2/C.
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Mitsuru YAMAMOTO, Yasuhei SHIMADA, Yasuhiro SASAKI, Takeshi INOUE, Kentaro NAKAMURA, Sadayuki UEHA, "A Multilayered Piezoelectric Transformer Operating in the Third Order Longitudinal Mode and Its Application for an Inverter" in IEICE TRANSACTIONS on Electronics,
vol. E85-C, no. 10, pp. 1824-1832, October 2002, doi: .
Abstract: Low-profile inverter power supplies are increasingly required for backlight systems of liquid crystal displays (LCDs). A great deal of attention has been focused on the application of piezoelectric transformers (PTs) to such power supplies. To miniaturize PT inverters still further, PTs need to have sufficient high voltage-step-up-ratio, which can be achieved by a multilayered PT. First, this paper describes a method for simulating such performance using a distributed constant equivalent circuit model. The results of the simulation for a multilayered PT operated in the third order longitudinal vibration mode show that the resistance of internal electrodes causes the dominant loss factor. Next, a power inverter incorporating the multilayered PT was fabricated. This power inverter can be operated over a wide input DC voltage range from 7-20 V. Regarding a conventional inverter drive circuit, when input DC voltage range was extended, the inverter efficiency remarkably decreased. For the reason, we developed a new inverter circuit, which is equipped with an automatic drive voltage control circuit to maintain the drive voltage to the PT at a constant value. As a result, the fabricated power inverter exhibited more than 90% overall efficiency and 3.5 W output power, which is enough to light up a 12.1-inch color LCD. The maximum luminance efficiency on a light transmission plate of the backlight was as high as 30 cd/m2/W.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e85-c_10_1824/_p
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@ARTICLE{e85-c_10_1824,
author={Mitsuru YAMAMOTO, Yasuhei SHIMADA, Yasuhiro SASAKI, Takeshi INOUE, Kentaro NAKAMURA, Sadayuki UEHA, },
journal={IEICE TRANSACTIONS on Electronics},
title={A Multilayered Piezoelectric Transformer Operating in the Third Order Longitudinal Mode and Its Application for an Inverter},
year={2002},
volume={E85-C},
number={10},
pages={1824-1832},
abstract={Low-profile inverter power supplies are increasingly required for backlight systems of liquid crystal displays (LCDs). A great deal of attention has been focused on the application of piezoelectric transformers (PTs) to such power supplies. To miniaturize PT inverters still further, PTs need to have sufficient high voltage-step-up-ratio, which can be achieved by a multilayered PT. First, this paper describes a method for simulating such performance using a distributed constant equivalent circuit model. The results of the simulation for a multilayered PT operated in the third order longitudinal vibration mode show that the resistance of internal electrodes causes the dominant loss factor. Next, a power inverter incorporating the multilayered PT was fabricated. This power inverter can be operated over a wide input DC voltage range from 7-20 V. Regarding a conventional inverter drive circuit, when input DC voltage range was extended, the inverter efficiency remarkably decreased. For the reason, we developed a new inverter circuit, which is equipped with an automatic drive voltage control circuit to maintain the drive voltage to the PT at a constant value. As a result, the fabricated power inverter exhibited more than 90% overall efficiency and 3.5 W output power, which is enough to light up a 12.1-inch color LCD. The maximum luminance efficiency on a light transmission plate of the backlight was as high as 30 cd/m2/W.},
keywords={},
doi={},
ISSN={},
month={October},}
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TY - JOUR
TI - A Multilayered Piezoelectric Transformer Operating in the Third Order Longitudinal Mode and Its Application for an Inverter
T2 - IEICE TRANSACTIONS on Electronics
SP - 1824
EP - 1832
AU - Mitsuru YAMAMOTO
AU - Yasuhei SHIMADA
AU - Yasuhiro SASAKI
AU - Takeshi INOUE
AU - Kentaro NAKAMURA
AU - Sadayuki UEHA
PY - 2002
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E85-C
IS - 10
JA - IEICE TRANSACTIONS on Electronics
Y1 - October 2002
AB - Low-profile inverter power supplies are increasingly required for backlight systems of liquid crystal displays (LCDs). A great deal of attention has been focused on the application of piezoelectric transformers (PTs) to such power supplies. To miniaturize PT inverters still further, PTs need to have sufficient high voltage-step-up-ratio, which can be achieved by a multilayered PT. First, this paper describes a method for simulating such performance using a distributed constant equivalent circuit model. The results of the simulation for a multilayered PT operated in the third order longitudinal vibration mode show that the resistance of internal electrodes causes the dominant loss factor. Next, a power inverter incorporating the multilayered PT was fabricated. This power inverter can be operated over a wide input DC voltage range from 7-20 V. Regarding a conventional inverter drive circuit, when input DC voltage range was extended, the inverter efficiency remarkably decreased. For the reason, we developed a new inverter circuit, which is equipped with an automatic drive voltage control circuit to maintain the drive voltage to the PT at a constant value. As a result, the fabricated power inverter exhibited more than 90% overall efficiency and 3.5 W output power, which is enough to light up a 12.1-inch color LCD. The maximum luminance efficiency on a light transmission plate of the backlight was as high as 30 cd/m2/W.
ER -