臺灣博碩士論文加值系統

本文主要的目的是以研製三相全橋式六步方波高頻切換之冷陰極燈管驅動器電路應用於液晶螢幕背光源為主。目前液晶顯示器已逐漸地淘汰傳統映像管螢幕，且照明能力的好壞決定液晶顯示器的優劣，所以良好的燈管驅動器是有其必要性的，目前的趨勢是朝向大尺寸的方向發展，為了維持背光源的均勻度與高亮度，多燈管的背光源是不可或缺的，因此所需的背光源驅動器數量亦隨之增加，負載冷陰極燈管由於具有高發光效率與低功率消耗特點，因此廣泛被使用在照明設備上。本架構負載部分使用Y接，驅動六支燈管為一組之電路架構，以降低多燈管之配置電線電路，此外，在三相平衡情況下中性電流驅近為零，亦可降低導線截面積，並利用調頻和調整導通週期的方式達到冷陰極管調光的功能。

In this paper, a high-frequency switching with three-phase full-bridge six-step inverters for Cold-Cathode Fluorescent Lamp (CCFL) drivers circuit applied in liquid crystal display (LCD) back-light is proposed. The Cathode-ray tube (CRT) gradually has been replaced by the traditional liquid crystal display (LCD) at present. The light will decide the quality of the LCD, it is important to have a good performance of the back-light drivers. In a large size LCD panel, multiple lamps are required to provide sufficient back lighting. Therefore, the quantity of the back light drivers will be increased for the necessary of multiple lamps. Since the load, CCFL have high optical efficiency and low power demanded, CCFL are widely used in illumination. A set of six CCFL connected by Y to reduce the neutral line of the multi-lamps circuit is proposed in this paper. When the three-phase drivers of the CCFL is in balance situation, the natural current is near zero, and the wire area will be decreased in a large panel. A dimming process is employed by frequency-modulation and control duty-cycle.

目次
中文摘要………………………………………………………………………………I
英文摘要……………………………………………………………………………II
誌謝…………………………………………………………………………………III
目次…………………………………………………………………………………IV
表目錄………………………………………………………………………………VI
圖目錄………………………………………………………………………………VI
第一章 緒論…………………………………………………………………………1
1.1 研究背景與目的……………………………………………………………1
1.2 論文架構……………………………………………………………………3
第二章 冷陰極燈管特性……………………………………………………………4
2.1 背光模組各組成元件功能簡介……………………………………………4
2.2 背光源種類…………………………………………………………………7
2.3 冷陰極燈管發光原理………………………………………………………8
2.4 冷陰極管的特點……………………………………………………………9
第三章 應用於液晶顯示器背光源的驅動架構…………………………………17
3.1 負載諧振網路分析………………………………………………………17
3.1.1 串聯諧振串聯負載網路(SRSL)……………………………………17
3.1.2 串聯諧振並聯負載網路(SRPL)……………………………………19
3.1.3 串聯諧振串並聯負載網路(SRSPL)………………………………20
3.1.4 三種諧振電路的比較………………………………………………22
3.2 電流饋入型推挽式電路架構……………………………………………22
3.2.1 他激式………………………………………………………………23
3.2.2自激式………………………………………………………………24
3.3 半橋串聯諧振轉換器架構………………………………………………25
3.4 全橋相位移轉換器架構…………………………………………………26
第四章 三相全橋式六步方波之高頻切換冷陰極燈管驅動架構…………………29
4.1 三相全橋式換流器………………………………………………………29
4.1.1 導通週期 …………………………………………………………31
4.1.2 怠滯時間……………………………………………………………36
4.1.3 調光方式……………………………………………………………38
4.2 變壓器連接方式分析……………………………………………………40
4.2.1 Y-Y-Y接法…………………………………………………………40
4.2.2 Y-Y-△接法…………………………………………………………41
4.2.3 Y-△-△接法…………………………………………………………43
4.2.4 Y-△-Y接法…………………………………………………………44
4.3 Is Spice模擬………………………………………………………………48
4.4 三相驅動器硬體製作……………………………………………………53
4.4.1柔性切換……………………………………………………………54
4.4.2 三相驅動器…………………………………………………………56
4.5 實測波形…………………………………………………………………62
4.5.1 硬體波形量測………………………………………………………63
4.5.2 硬體實體圖…………………………………………………………77
第五章 結論與未來研究方向……………………………………………………80
5.1 結論………………………………………………………………………80
5.2 未來研究方向……………………………………………………………81
參考文獻……………………………………………………………………………82

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