臺灣博碩士論文加值系統

本文之研究目的為探討以脈波驅動發光二極體，利用人眼視覺暫留現象之特徵以找出提升發光效能、減少功率損耗之最佳化脈波參數。
本研究是以改變不同之輸入功率、驅動頻率及負載週期等控制參數驅動發光二極體，先以感光二極體進行發光強度之實驗與測試，再以人眼進行實際觀察驗證。在實驗與測試過程中，藉由系統之數學模型建構與驗證，以簡化全參數測試過程、提升實驗效率，並藉由建立最佳化參數設定流程與發光效率試算公式，提供快速設定最佳化參數之方法。最後證實，以脈波驅動發光二極體之最佳化控制參數及輸入條件，是為以最大工作額定電流，並依實際使用之最小亮度需求及最大功率限制下，以最小之負載週期作為驅動條件設定。實驗結果證明，利用人眼視覺暫留現象以脈波驅動發光二極體，確實可以提升發光效能以達到減少功率損耗之目的。

This thesis investigates how to utilize persistence of vision in combination with pulsing power drive to improve the efficiency of light emitter diode (LED) by experimental as well as analytical approaches.

A series of experiments are first carried out to characterize the performances of LED and photodiode with various power input, frequency and duty cycle, followed by a comparison of photodiode and human eye observation. By analyzing the nonlinear response of system components and links between them, an analytical model is established and optimal pulsing parameters can be obtained. It is suggested that the optimal condition to efficiently drive a LED is to use maximum recommended operation current with minimum duty cycle while meeting the requirement of maximum intensity and minimum power requirement. From this study, it is concluded that pulsing power drive can substantially lower input power and improve the LED lighting efficiency.

考試合格證明 …………………………………………………… 2
中文摘要 ………………………………………………………… 3
英文摘要 ………………………………………………………… 4
誌謝 ……………………………………………………………… 5
目錄 ……………………………………………………………… 6
表目錄 …………………………………………………………… 9
圖目錄 …………………………………………………………… 10
符號表 …………………………………………………………… 13
第一章 緒論 …………………………………………………… 14
第二章 研究動機及背景………………………………………… 17
2.1 研究動機 ………………………………………………… 17
2.2 研究背景 ………………………………………………… 18
2.2.1 發光二極體 …………………………………………… 18
2.2.2 脈寬調變 ……………………………………………… 25
2.2.2 視覺暫留 ……………………………………………… 26
2.3 文獻回顧 ………………………………………………… 27
2.3.1 LED驅動電路 ………………………………………… 27
2.3.2以脈寬調變驅動發光二極體 ………………………… 29
2.3.3以脈波驅動發光二極體結合人眼視覺暫留 ………… 33
第三章 實驗方法與系統 ……………………………………… 34
3.1 實驗方法 ………………………………………………… 34
3.2 實驗系統 ………………………………………………… 38
第四章 實驗分析與討論 ….…………………………………… 39
4.1 實驗準備及確認 ………………………………………… 39
4.1.1 實驗電路架構 ………………………………………. 39
4.1.2 電壓-電流曲線 ………………………………………. 44
4.1.3 脈波輸入之負載週期與輸入功率 ……………………… 45
4.1.4 電流與發光強度 ………………………………………… 48
4.2 感光二極體暫態反應 ...………………………………… 51
4.2.1 暫態延遲反應曲線 ……………………………………… 51
4.2.2 延遲反應限制 …………………………………………… 56
4.2.3 暫態曲線之光強度控制參數 …………………………… 57
4.3 感光二極體之定量分析 ...……………………………… 62
4.3.1 固定功率下之實驗分析 ………………………………… 62
4.3.2 固定光強度下之實驗分析 ……………………………… 70
4.3.3 以不同LED進行比對 ………………………………….. 75
4.4以人眼實際觀測LED發光強度 …………………………… 76
4.4.1人眼實際觀察之直流與脈波亮度差異 ………………… 76
4.5 最佳化參數設定 ..………………………………………… 81
4.5.1 參數式試算法 …………………………………………… 81
4.5.2 最佳化參數設定流程 …………………………………… 84
第五章 結論與建議 ….....…………………………………… 87
5.1 結論 ………………………………………………………… 87
5.2 建議 ………………………………………………………… 90
參考文獻 ………………………………………………………… 91
自述 ……………………………………………………………… 94

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