A Multilayered Piezoelectric Transformer Operating in the Third Order Longitudinal Mode and Its Application for an Inverter
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概要
- 論文の詳細を見る
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/m^2/W.
- 社団法人電子情報通信学会の論文
- 2002-10-01
著者
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山本 正樹
東北大学多元物質科学研究所
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Nakamura Kentaro
Precision And Intelligence Laboratory Tokyo Institute Of Technology
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Inoue T
Tohoku Univ. Sendai Jpn
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Sasaki Yasuhiro
Display Device Development Division Nec Corporation
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Inoue T
Advanced Discrete Semiconductor Technology Laboratory Corporated Research And Development Center Tos
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Inoue Tatsuya
Materials And Components Research Laboratory Components And Devices Research Center Matsushita Elect
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Inoue Tetsushi
Research Laboratory Of Resources Utilization Tokyo Institute Of Technology
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UEHA Sadayuki
Precision and Intelligence Laboratory, Tokyo Institute of Technology
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Yamamoto M
Ntt System Electronics Laboratories
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Yamamoto M
Ntt Electronics Technology Corporation
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Yamamoto Masafumi
Ntt System Electronics Laboratories
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Yamamoto Masafumi
Ntt Lsi Laboratories
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Sasaki Yasuhiro
Functional Devices And Material Laboratories Nec Corporation
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Sasaki Yasuhiro
Research And Development Group Nec Corporation
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YAMAMOTO Mitsuru
Functional Devices and Material Research, NEC Corporation, Precision and Intelligence Laboratory, To
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INOUE Takeshi
Functional Devices and Material Research, NEC Corporation
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Inoue Takahito
Electrotechnical Laboratory
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山本 正樹
京都大学医学部附属病院感染制御部
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Sasaki Y
Department Of Basic Science Ihinomaki Senshu University
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SHIMADA Yasuhei
Display Device Development Division, NEC Corporation
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Ueha Sadayuki
Precision And Intelligence Lab. Tokyo Inst. Of Technol.
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Nakamura Kentaro
Precision And Intelligence Lab. Tokyo Inst. Of Technol.
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Inoue T
Applied Laser Engineering Research Institute
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Yamamoto Mitsuru
Functional Materials Research Laboratories Nec Corporation:precision And Intelligence Laboratory Tok
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Yamamoto Mitsuru
Functional Devices and Material Laboratories, NEC, Corporation, 4-1-1 Miyamae-ku, Kawasaki 216-8555, Japan
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