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
Des alimentations à onduleur discrètes sont de plus en plus requises pour les systèmes de rétroéclairage des écrans à cristaux liquides (LCD). Une grande attention a été portée à l'application de transformateurs piézoélectriques (PT) à de telles alimentations. Pour miniaturiser davantage les onduleurs PT, les PT doivent avoir un rapport d'augmentation de tension suffisamment élevé, ce qui peut être obtenu par un PT multicouche. Tout d’abord, cet article décrit une méthode permettant de simuler de telles performances à l’aide d’un modèle de circuit équivalent constant distribué. Les résultats de la simulation pour un PT multicouche fonctionnant en mode de vibration longitudinale du troisième ordre montrent que la résistance des électrodes internes provoque le facteur de perte dominant. Ensuite, un onduleur intégrant le PT multicouche a été fabriqué. Cet onduleur peut fonctionner sur une large plage de tension d'entrée CC de 7 à 20 V. Concernant un circuit de commande d'onduleur conventionnel, lorsque la plage de tension d'entrée CC a été étendue, l'efficacité de l'onduleur a remarquablement diminué. C'est pour cette raison que nous avons développé un nouveau circuit inverseur, équipé d'un circuit de contrôle automatique de la tension de commande pour maintenir la tension de commande du PT à une valeur constante. En conséquence, l’onduleur fabriqué présentait un rendement global de plus de 90 % et une puissance de sortie de 3.5 W, ce qui est suffisant pour éclairer un écran LCD couleur de 12.1 pouces. L'efficacité de luminance maximale sur une plaque de transmission de lumière du rétroéclairage atteignait 30 cd/m2/W.
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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},}
Copier
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 -