Rosen-Type壓電變壓器之設計分析研究

Design and Analysis of Rosen-Type Piezoelectric Transformer

林惠雅(Hui-Ya Lin)

指導教授 ： 丁鏞

中原大學/工學院/光機電及資電控產業研發碩士專班/碩士(2007年)

https://doi.org/10.6840/cycu200700097

摘要

摘 要
壓電陶瓷變壓器是近年來迅速發展起來的新一代小型高性能電源變壓器，與傳統繞線式變壓器相比，兩者在結構、製造材料、升壓原理上是截然不同的。壓電陶瓷變壓器具有小尺寸、高轉換效率、高升壓輸出等突出的優點，目前廣泛運用在液晶顯示器背光光源冷陰極管的驅動器，並已在實用中獲得了很好的效果。
在各式各樣的壓電變壓器中，最常用的是Rosen type型式。本文重點於討論Rosen type壓電變壓器之結構尺寸比與升壓增益值的關係，利用有限模擬軟體ANSYS模擬分析，取得輸出電壓值、最小位移點、應力值及諧振頻率下之三維振動模態，及各能量分布探討。由模擬結果顯示壓電變壓器升壓於諧振頻率上，是以全波諧振頻率下的電壓增益值為最高；而無外加負載的情況下，隨著長寬比(lL/lW)與長高比(lL/lh)之遞增，其電壓增益值隨之遞增，且結構長度越長，諧振頻率值越低且電壓輸出越高，但至某ㄧ程度後會趨於緩和；當壓電變壓器兩邊之換能端長度略大於致動端，其輸出電壓值會略高於兩邊尺寸相等。

關鍵字

背光光源冷陰極管驅動器 ； 壓電變壓器

並列摘要

Abstract
The recently developed piezoelectric ceramic transformer has the advantage of high power transmission efficiency produced in a small-scale structure. Compared with traditional magnetic transformer, they have completely different structure and made materials, and principle of voltage step-up ratio. In general, the piezoelectric ceramic transformer is of the advantages of small size, high conversion efficiency, high voltage step-up ratio, etc. It is widely used for the Cold Cathode Fluorescent Lamp source driver and is already obtained satisfactory performance in practical applications.
In those different kinds of piezoelectric transformers, the most popular one is the Rosen type. In this article, the focus is on the structure (dimension) and its effect to the voltage step-up ratio for a Rosen-type piezoelectric transformer. Finite element simulation software ANSYS is used. Through the simulations results of output voltage, minimum displacement, stress value, three-dimensional modal analysis, and energy distribution, it concludes that the highest voltage step-up ratio operated with full wave resonance frequency; under no-load condition, the voltage step-up ratio increases as the ratio of length to width and the ratio of length to height increases; the voltage output increases for the resonant frequency becomes lower while the length increases, but the increasing degree becomes very small when the length increases to a level; the output voltage is a little bit higher for the length of the generator section is longer than the length of the driver section as compared to the equal length of the driver section and the generator section.

並列關鍵字

cold cathode fluorescent lamp source driver ； piezoelectric transformer

參考文獻

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