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研究生:黃昭明
研究生(外文):Chao-ming Huang
論文名稱:應用變壓器一次側串聯之多管冷陰極螢光燈均流電路
論文名稱(外文):A Balance Circuit Employing Transformers with Serial Primary Windings for Multiple Cold Cathode Fluorescent Lamps
指導教授:莫清賢莫清賢引用關係
指導教授(外文):Chin-Sien Moo
學位類別:碩士
校院名稱:國立中山大學
系所名稱:電機工程學系研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2007
畢業學年度:95
語文別:中文
論文頁數:65
中文關鍵詞:液晶顯示器背光模組冷陰極螢光燈均流電路
外文關鍵詞:cold cathode fluorescent lamp (CCFL)back-light moduleliquid crystal displaybalance scheme
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中、大型液晶顯示器背光模組一般採用多管冷陰極螢光燈設計,為達到均勻的輸出光源,多會外加均流電路以達成各燈管電流均流的目的。本文採用半橋式換流器的電路架構,驅動繞組匝數比相同的多組升壓式變壓器,變壓器的一次側繞組以串聯方式相互連接,二次側繞組則分別獨立驅動冷陰極螢光燈管。因變壓器一次側串聯,使各組變壓器一次側流過相同電流,進一步將使得各組變壓器二次側電流趨於一致,達成各燈管電流均流的結果。
本文製作完成多管冷陰極螢光燈驅動電路,並實際驅動由8支U 型燈管所組成的32吋背光模組。藉由軟體模擬及實驗結果證實本文電路的均流效果,即使在低燈管電流時,仍能維持均流操作。
For a back-light module with multiple cold cathode fluorescent lamps (CCFLs) in mid-size or large size liquid crystal displays, a balance scheme must be included to have approximately equal currents among the lamps and hence to output equal brightness. In this thesis, a half-bridge inverter is adopted to drive multiple step-up transformers with the same turn ratio, in which the primary windings of the transformers are connected in series whereas the second windings drive CCFLs in parallel. Due to the series connection of the transformer sets, the current going through the primary windings is identical, so that the lamp currents from second windings tend to be equal.
A driver circuit with the proposed scheme is designed for 8 U-type cold cathode fluorescent lamps in a 32-inch backlight module. The simulation and experimental results demonstrate the effectiveness of the balance scheme, even for the lamps operating at low current.
中文摘要 I
英文摘要 II
目錄 III
圖表目錄 V
第一章 簡介 1
1-1研究動機 1
1-2論文大綱 3
第二章 冷陰極螢光燈特性及驅動電路 4
2-1冷陰極螢光燈特性 4
2-1-1冷陰極螢光燈發光原理 4
2-1-2冷陰極螢光燈驅動電路穩定性 5
2-2冷陰極螢光燈驅動電路及均流架構 7
2-2-1冷陰極螢光燈驅動電路 7
2-2-2多管冷陰極螢光燈驅動架構 10
2-2-3多管冷陰極螢光燈均流架構 11
第三章 應用變壓器一次側串聯之多管冷陰極螢光燈均流電路 16
3-1電路架構及等效模型 16
3-1-1變壓器一次側串聯均流電路架構 16
3-1-2變壓器一次側串聯等效電路模型 18
3-2電路參數設計 20
3-2-1等效電路推導 20
3-2-2電路均流原理 23
3-2-3電路參數估測 25
3-2-4電路特性分析 27
3-3背光模組之洩漏效應及等效模型 29
第四章 實驗量測與結果 34
4-1電路模擬及實際量測 34
4-2燈管均流效果及誤差 43
4-2-1操作頻率範圍 43
4-2-2燈管電流分佈及總電流誤差 45
第五章 結論與未來研究方向 50
參考文獻 52
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