臺灣博碩士論文加值系統

本論文目標為研製一適用於電致發光顯示器(Electroluminescent Display，ELD)之驅動電源，其主電路架構為昇壓型功率因數修正器及半橋變頻器兩級串接，以提供ELD所需的交流電源。架構中之控制信號部分以8051微處理器來實現，可以有效控制輸出交流頻率，進而改變ELD所發出的亮度。輔助電源採用返馳式電路，分別供給8051微處理器及IR2110使用，方便整體電路直接以市電運作。本論文亦提出一亮度回授電路，由於ELD的亮度會隨輸出交流電壓的頻率及振幅而有所改變，根據此特性，亮度回授電路可以自動調整輸出頻率，以維持固定的ELD發光亮度。經實測證明，本論文所實作之電源系統的確可以驅動ELD發光，並達到調光功能。

A power supply suitable for the electroluminescent display (ELD) is studied and implemented in this thesis. The main power circuit consists of a front-stage boost power factor corrector (PFC) and a post-stage half-bridge inverter to provide an output AC voltage with tunable frequencies. The controller is implemented using the 8051 microprocessor, which can effectively control the output frequency and thus change the brightness of the ELD. A multi-output flyback converter is adopted as the auxiliary power supply for driving the 8051 microprocessor and other IC’s. Also a brightness-feedback control circuit is proposed in this thesis. Because the brightness of the ELD changes with the frequency of the output AC voltage, the presented brightness-feedback circuit can adjust the output frequency to stabilize the brightness of the ELD at a specified level. Experimental results show that the implemented power supply is capable of driving the ELD and achieving the dimming function.

中文摘要 I
英文摘要 II
誌謝 III
目錄 IV
圖表索引 VI
符號索引 X

第一章、 緒論 1
1-1 研究動機 1
1-2 研究目的 2
1-3 內容大綱 2
第二章、 ELD 4
2-1 ELD簡介 4
2-2 AC薄膜ELD 7
2-3 AC薄膜ELD之其他特性 13
第三章、 ELD驅動電源基本架構 17
3-1 基本架構 17
3-2 半橋式驅動電源控制訊號之製作 18
3-3 倍壓整流器與半橋變頻器 22
第四章、 開迴路ELD特性測試 27
4-1 前言 27
4-2 直流電壓對亮度的影響 27
4-3 頻率對亮度的影響 29
4-4 盲時與電容對亮度的影響 31
4-5 輸出負載電流突波抑制 33
第五章、 亮度回授 36
5-1 亮度回授電路設計考量 36
5-2 VCO電壓控制振盪電路 36
5-3 亮度回授的基本架構 39
5-4 亮度回授實測結果 44
第六章、 ELD驅動電源設計 57
6-1 設計考量 57
6-2 PFC穩壓回授 58
6-3 閘極驅動電源設計 59
6-4 半橋式變頻器 62
6-5 輔助電源 64
6-6 輸出濾波電感設計 69
6-7 實測結果 70
第七章、 結論與建議 75
7-1 結論 75
7-2 未來研究方向建議 76
參考文獻 77

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