共查询到18条相似文献,搜索用时 156 毫秒
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压电陶瓷变压器是一种新型的压电换能器件,它在结构与特性上和传统的线绕铁芯电磁变压器有很大的区别,本文对压电陶瓷变压器(多层)的发展历史、主要制造工艺、工作原理及应用技术作简要的讨论。 相似文献
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LCD背照光用压电陶瓷变换器 总被引:2,自引:0,他引:2
早在五十年代,为了产生高压曾研究与开发出压电变压器,但未能实用化而中断下来。最近,彩色笔记本电脑市场发展迅猛,以往的电磁变压器很难适应小型、轻便和高效率要求,压电变压器作为产生高压的小型器件再度受到重视。本文仅就液晶显示器LCD背照光用压电变压器,介绍一种3次Rosen Type的压电变压器。 相似文献
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压电变压器的研究进展 总被引:5,自引:0,他引:5
压电变压器是一种很有发展前景的固体电子器件,有高转换效率、高能量密度、结构简单、体积小、无电磁噪声及不可燃烧等特点。介绍了压电变压器的结构、工作原理、制造方法,综述了国内外压电变压器陶瓷材料、结构设计、理论模型和应用研究的进展情况,并对压电变压器未来的发展趋势作了展望。 相似文献
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液晶显示器背光源驱动优化的探讨 总被引:13,自引:11,他引:2
探讨了液晶显示器背光源驱动的优化,分析了冷阴极荧光灯的特性和对驱动的要求。介绍了压电陶瓷变压器,并对LCD背光源中的电磁变压器和压电陶瓷变压器的差异做了比较。最后讨论了在LCD背光源中用压电陶瓷变压器替代传统电磁变压器的可行性。 相似文献
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与传统的电磁变压器相比,压电变压器具有高升压、无电磁污染等特点。由于压电变压器的工作原理复杂,除了Rosen型压电变压器,对于其他压电变压器的理论研究较少。对一种驱动部分以及发电部分都是横场模式的横横式压电变压器进行了理论研究。从Mosen等效电路出发,利用泰勒展开,建立了能反映压电变压器实际工作情况的集总式等效电路图;并在此基础上,给出了一种只用机械品质因数Qm、电学品质因数Qe及机电耦合系数k三个量来表征变压器电学性能的方法。由于Qm、Qe、k的测量方法早已标准化,尺寸、负载对变压器的影响可归结为Qe对电学性能的函数,因此有望简化设计过程。 相似文献
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介绍雷达CRT显示器压电陶瓷变压器高压电源的基本结构和工作原理;从压电陶瓷变压器基本特性入手,分析压电陶瓷变压器高压电源的环境适应性及电磁兼容性,表明它能满足雷达可靠性要求. 相似文献
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压电陶瓷变压器是一种新型固态电子元器件,它具有结构及工艺制作简单、体积小、重量轻、无电磁噪声、无电磁绕阻、不可燃性、不怕短路、完整性好等优点。压电陶瓷变压器可提高整机的可靠性,适应当前电子产品小型化、轻型化的发展需要,在冷阴极荧光灯、霓虹灯管、激光管和x光管中得到了广泛的应用。 相似文献
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条形弯曲振动压电变压器电路模型及特性研究 总被引:1,自引:0,他引:1
本文所研究的压电变压器工作在弯曲振动模式下.较之现有的压电变压器而言,这种器件能够以较小的几何尺寸实现低频率的振动,文中应用能量法对该压电变压器进行了理论分析和推导,并得出其等效电路模型.文中还进行了样品的制作和测试工作,测试结果与理论结果基本一致. 相似文献
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近年来,由于笔记本、个人计算机市场的不断扩大,导致以往采用电磁变压器的背景灯小型化、薄型化以及高效率化等相当困难,而目前对此类的需求却日益增加,同时,由于压电元器件材料的高功率特性的改善,致使可作为小型高压生成元件的压电变压器重新受到重视.本文主要针对压电陶瓷变压器在开关电源逆变器上的应用进行阐述. 相似文献
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In this paper, a new complementary gate driver for power metal-oxide semiconductor field-effect transistors and insulated gate bipolar transistors is presented based on the use of a piezoelectric transformer (PT). This type of transformer has a high integration capability. Its design is based on a multilayer structure working in the second thickness resonance mode. A new design method has been used based on an analytical Mason model in order to optimize the efficiency, the available power at the transformer secondary ends, and the total volume. This design method takes into account mechanical losses and heating of the piezoelectric material; it can be extended to predict the characteristics of the PT: gain, transmitted power, efficiency, and heating of piezoelectric materials according to load resistance. A prototype of a PT rated for an inverter-leg gate driver was fabricated and tested experimentally. All calculated characteristics have been confirmed by measurements. Satisfactory results have been obtained in driving a 10-A/300-V/10-kHz chopper. Moreover, a study has been carried out about the propagation of common mode currents between the top-switch and the bottom-switch of the inverter leg throughout the driver in order to avoid cross-talking failures. 相似文献
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多层压电变压器具有体积小,质量轻,效率高等特点,具有许多重要的应用领域。本文首次采用目前国内外最先进的激光光纤测振仪测量了多层压电变压器的谐振特性和振动位移情况,为多层压电变压器的设计和研究提供了一种非常有效的测试技术。 相似文献
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Magnetic cores have been used in transformers for over a century. In this paper, the authors present a fundamental concept of using “coreless” printed-circuit-board (PCB) transformers. With the aid of a high-frequency equivalent circuit, the use and basic characteristics of coreless PCB transformers are described. Optimal operating conditions for minimum input power requirement and maximum efficiency operations are identified. Coreless PCB transformers have the advantages of low costs, very high power density, no limitation due to magnetic cores, no magnetic loss and ease of manufacturing. They have the potential to be developed in microcircuits. A printed planar PCB transformer with a diameter of about 1.0 cm and power capability of 19 W has been successfully tested. The power density of the PCB transformer demonstrated in this paper is 24 W/cm2. The maximum efficiency can be greater than 90%. The analysis has been confirmed with experiments. Coreless printed transformers have great potential in applications in which stringent height and space requirements have to be met 相似文献