臺灣博碩士論文加值系統

本論文提出一應用於自激式Royer換流器之混合式調光控制器(Hybrid Dimming Controller)，該控制器包含了具同步控制的時滯調節式脈波寬度調變控制器(Dead-Time-Modulated Pulse-Width-Modulation Controller，DTM-PWM)及軟切換脈衝調變控制電路(Soft-Burst Circuit)。本文中為了降低寄生電容所造成之漏電流影響，將傳統二次側(Secondary Side)回授改採由一次側(Primary Side)回授，使架構中的冷陰極螢光燈管與系統地端完全隔離；並採用了時滯調節式脈波寬度調變控制器，以提昇系統整體效率、降低開關頻率和諧振頻率不同所產生之諧波干擾，同時為了增加調光範圍及消除舊式脈衝調光(Burst Dimming)在每一個週期起動時所造成的燈管電流及電壓突波，另採用了一軟切換脈衝調變技術來做為調光控制。本文除了詳細說明所提之電路架構其各元件值之設計考量及設計方式外，並實際設計出一換流器，然後進行其特性規格之量測，其實驗結果和理論推導十分相符。

This thesis proposes a hybrid dimming controller for self-oscillation Royer inverter. The hybrid dimming controller is composed of a dead-time-modulated pulse-width-modulation (DTM-PWM) controller and a soft-burst circuit. To reduce leakage current resulted from parasitic capacitance in the lamp, we utilize floating lamp structure with primary-side dimming control in this study. In order to increase the overall system efficiency and reduce EMI resulted from the difference between buck drives frequency and Royer resonant frequency we use the dead-time-modulated pulse-width-modulation controller. Besides, a soft-burst technique is adopted for eliminating the ignition current and voltage spike during dimming process. Comprehensive analysis and design considerations are discussed in detail in this thesis. An inverter is actually designed according to this thesis, which indicates that experimental results are close to the theoretical prediction.

中文摘要………………………………………………………… Ⅰ
英文摘要………………………………………………………… Ⅱ
目錄…………………………………………………………… Ⅲ
圖表索引………………………………………………………… Ⅴ

第一章 緒論……………………………………………………… 1
1.1 研究背景與動機……………………………………… 1
1.2 研究目的………………………………………………… 1
1.2 內容大綱………………………………………………… 2

第二章 冷陰極螢光燈之物理特性與應用………………………. 4
2.1 背光用光源的種類……………………………………… 4
2.2 螢光燈發光原理與構造………………………………… 7
2.3 冷陰極螢光燈之特性…………………………………… 9
2.4 冷陰極螢光燈的設計要點……………………………… 15
2.5 冷陰極螢光燈於液晶顯示之背光光源應用…………… 16

第三章 冷陰極螢光燈驅動電路架構……………………………. 20
3.1冷陰極螢光燈驅動電路節介……………….…….…...… 20
3.2自激式Royer換流器原理……………………………….. 21
3.3調光與控制……………………………………………….. 31

第四章 混合調光控制原理………………………………………. 40
4.1 同步信號取樣策略…..………………………………….. 42
4.2 時滯調節鋸齒波之產生…..…………………………….. 42
4.3 混合調變控制信號之產生…..………………………….. 43
4.4 混合調變控制器工作狀態分析…………………………. 46

第五章 設計考量與設計實例……………………………………. 52
5.1 Royer換流器之設計考量…….………………………… 52
5.2 Royer換流器之設計實例……………………………… 60

第六章 實驗量測與分析…………………………………………. 65
6.1 Royer換流器波形量測與分析…………….…………… 65
6.2 時滯調節式脈波寬度調變控制器波形量測與分析…… 66
6.3 混合調變控制器波形量測與分析……………………… 67
6.4 輸出效率整理與分析……………………………………. 74
6.5 實作電路…………………………………………………. 75

第七章 結論與未來研究方向……………………………………. 77
7.1 結論……………………………………………………… 77
7.2 未來研究方向建議……………………………………… 78

參考文獻………………………………………………………… 79

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