單一變壓器驅動多燈冷陰極螢光燈管電流平衡之研究｜國立臺灣科技大學博碩士論文系統

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研究生：	劉兆偉 Jhao-Wei Liou
論文名稱：	單一變壓器驅動多燈冷陰極螢光燈管電流平衡之研究 Research of the Current Balanced Techniques for Multi-CCFLs Driven by Single Transformer
指導教授：	蕭弘清 Horng-Ching Hsiao
口試委員:	王順源 Shun-Yuan Wang 周錦惠 Chin-Hui Chou 黃仲欽 Chung-Chien Huang
學位類別：	碩士 Master
系所名稱：	電資學院 - 電機工程系 Department of Electrical Engineering
論文出版年：	2007
畢業學年度：	95
語文別：	中文
論文頁數：	95
中文關鍵詞：	電流平衡、單一變壓器驅動多燈管、數位調光
外文關鍵詞：	current balanced, multi-CCFLs driven by single transformer, burst dimmy
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上一筆

近年來國內液晶顯示器蓬勃發展，背光模組亦漸受重視。在競爭激烈的市場中，如何做到高效能、省成本、燈管電流平衡，為各界所努力的共同目標。
本文使用TL-494做為驅動IC，並以推挽式轉全橋模式達到零電壓切換(ZVS)條件。不同於以往所採用的單一變壓器推動單一冷陰極螢光燈的方式；依據電磁感應特性，本研究採用單一變壓器推動多組冷陰極螢光燈，串聯在變壓器二次側的螢光燈管先各自串接一個平衡線圈，再串連成電流平衡模式，而達到平衡燈管電流的特性。
本架構經全文理論與實作結果，驗證了在不同的燈管雜散電容下，使原本不平衡的燈管電流，皆可達到均流目的，均流的效果也較單一變壓器驅動單燈管架構來的好。

Recently, the liquid crystal displays were developed rapidly and successfully in recent year, the relative backlight modules were paid attention and become an important key-part also. In the market competition, how to attain high performances in the lowest cost and let the current distribution among the cold cathode fluorescent lamps (CCFL) to be balanced in order to extent the life-span of the display are the common subject to all manufacturers.
An integrated circuit, TL-494, was adopted to design the drive circuit, and the zero voltage switching (ZVS) was reached by connecting push-pull output to the full-bridge module. Meanwhile, instead of the conventional individual driving circuit design technology, the multi-CCFLs are driven by a single transformer. The secondary windings were connected in series through the individual lamps which be connected a balance coil separately to complete the current balanced configuration.
The methodology and circuit configurations were implemented and tested according to the specifications and requirements of the commercial market considerations. The results shows that the unbalanced current distribution among the lamps had been improved evidently for various different stray capacitances of lamps, the overall performances are much better than the structure of single CCFL driven by single transformer.

中文摘要......................................................................................................I
英文摘要.....................................................................................................II
誌謝....................................................................................................III
目錄.....................................................................................................IV
圖表索引......................................................................................................V
第一章 緒論......................................................................................................1
1 背景概述......................................................................................................1
2 研究目的、方法…....................................................................................................3
3 本文研究結果達成之貢獻......................................................................................................4
4 內文簡介..............................................................................................4
第二章 冷陰極螢光燈特性、驅動電路及調光控制.......................................6
1 前言......................................................................................................6
2 冷陰極螢光燈之發光原理..................................................................6
3 冷陰極螢光燈之電氣特性..................................................................8
4  LCD架構說明..................................................................................21
5 本章結語............................................................................................35
 第三章 驅動電路及調光控制理論.......................................................36
1 前言....................................................................................................36
2 典型驅動電路之比較........................................................................36
2.1 Royer型式之冷陰極螢光燈驅動電路.......................................37
2.2 半橋型式之冷陰極螢光燈驅動電路.........................................38
2.3 全橋型式之冷陰極螢光燈驅動電路.........................................38
2.4 推挽型式之冷陰極螢光燈驅動電路.........................................39
2.5 諧振電路.....................................................................................39
3 冷陰極螢光燈調光控制....................................................................42
3.1 類比調光控制.............................................................................42
3.2 數位調光控制.............................................................................43
3.3 對燈和脈衡調光的嚴格控制.....................................................44
4 單通道控架構之比較........................................................................44
5 本章結語............................................................................................45
第四章 單一變壓器驅動多燈管驅動電路原理分析及設計.......................46
1 前言....................................................................................................46
2 冷陰極螢光燈驅動電路規格簡介及安規範說明............................46
3 全橋定頻冷陰極螢光燈驅動電路原理分析....................................48
4 全橋定頻冷陰極螢光燈驅動之諧振電路設計................................52
4.1 諧振電路輸入電壓諧波成份分析.............................................52
4.2 全橋定頻冷陰極螢光燈驅動電路達到ZVS條件....................54
4.3 諧振參數之設計.....................................................................69
4.4 平衡線圈之證明.........................................................................72
5 全橋定頻驅動冷陰極螢光燈之脈寬調變 IC簡介........................74
6 結語..................................................................................................78
第五章 電路模擬及實作結果之比對.........................................................79
1 前言.................................................................................................79
2 實作圖................................................................................................79
3 實作量測及性能比較之說明............................................................80
3.1 電流平衡之比對.........................................................................81
3.2 數位調光波形分析.....................................................................83
3.3 電流波形和輝度之關係............................................................96
3.4 單一變壓器驅動多燈及單一變壓器驅動單燈之比較..........88
第六章 結論及未來展望.............................................................................89
1 結論..................................................................................................89
2 未來展望..........................................................................................89
附錄................................................................................................................91
參考文獻.......................................................................................................93
作者簡介........................................................................................95

                                

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全文公開日期 2012/01/28 (校內網路)
全文公開日期本全文未授權公開 (校外網路)
全文公開日期本全文未授權公開 (國家圖書館：臺灣博碩士論文系統)

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