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Design and characterization of piezoelectric transformers for high power applications.

机译：大功率应用的压电变压器的设计和特性。

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摘要

A piezoelectric transformer (PT) is an electro-mechanical device that transfers electrical energy through a mechanical vibration at its resonance frequency.; To improve the piezoelectric transformers in term of high density of transfer power, two types of piezoelectric transformers, a laminated piezoelectric transformer and an unipoled disk piezoelectric transformer, with radial extensional vibration mode were studied. For the laminated piezoelectric transformer, its structure consists of uniform-poled piezoelectric ceramic plates at the input and output parts with an insulation layer between them. This type of transformer provides more high power density, simple structure, isolation between input and output terminals, and multiple output voltage levels, since the output voltage depends on the thickness ratio between individual layer in the input and output parts. For the unipoled disk piezoelectric transformer, a hard piezoelectric material, which was poled only along the thickness direction, was used. The input and output electrodes were concentrically placed in the top surface of the ceramic. The input electrode was the external electrode ring and the output electrode was the internal center dot.; This proposed research is aimed to develop a good understanding of the piezoelectric transformer designs and their related properties. The equivalent circuit and finite element modeling analysis were initially performed to analyze the piezoelectric transformer behaviors. Various characteristics, such as, voltage step-up ratio, efficiency, temperature rise, and output power were experimentally investigated. Some examples of the transformer applications provide.; We found that Stycast® 1264 is a promising bonding material to improve transformer characteristics of the laminated piezoelectric transformer in terms of mechanical quality factor, and that the bonding layer thickness provides significant change in its properties, efficiency and output power. Size and shape of the piezoelectric element also affect the transformer's performance. It showed that the power capability of piezoelectric transformer can be increased when the disk-shape and bigger size of piezoelectric elements are used. From this study, the maximum output powers of 10 and 36 W were obtained for 23.8 and 45.0 mm diameter piezoelectric transformers with the same total thickness, respectively. These laminated transformers exhibit approximately three times higher power density than a rectangular Rosen-type piezoelectric transformer with a similar volume. (Abstract shortened by UMI.)
机译：压电变压器（PT）是一种机电装置，通过机械振动以其共振频率传递电能。为了改善压电变压器的高传递功率密度，研究了两种类型的压电变压器，即层压压电变压器和单极盘压电变压器，它们具有径向扩展振动模式。对于叠层式压电变压器，其结构由在输入和输出部分具有均一绝缘层的均匀极化压电陶瓷板组成。这种类型的变压器提供更高的功率密度，简单的结构，输入和输出端子之间的隔离以及多个输出电压电平，因为输出电压取决于输入和输出部分中各个层之间的厚度比。对于单极盘式压电变压器，使用仅沿厚度方向极化的硬质压电材料。输入和输出电极同心放置在陶瓷的顶面。输入电极是外部电极环，输出电极是内部中心点。这项拟议的研究旨在增进对压电变压器设计及其相关特性的理解。最初进行了等效电路和有限元建模分析，以分析压电变压器的行为。实验研究了各种特性，例如升压比，效率，温升和输出功率。提供了一些变压器应用示例。我们发现，Stycast ® 1264是一种有前途的粘结材料，可以改善层压压电变压器的变压器特性（根据机械品质因数），并且粘结层的厚度可显着改变其性能，效率和输出功率功率。压电元件的尺寸和形状也会影响变压器的性能。结果表明，采用圆盘状和较大尺寸的压电元件可以提高压电变压器的功率能力。根据这项研究，对于总厚度相同的23.8和45.0 mm直径的压电变压器，分别获得10 W和36 W的最大输出功率。这些叠层变压器的功率密度大约是具有类似体积的矩形Rosen型压电变压器的三倍。 （摘要由UMI缩短。）

著录项

  • 作者

    Laoratanakul, Pitak.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Engineering Materials Science.; Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 200 p.
  • 总页数 200
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;无线电电子学、电信技术;
  • 关键词

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