臺灣博碩士論文加值系統

為達到多顆發光二極體(Light Emitting Diode, LED)構成之平面光源的最佳化均勻照度，本論文量測單一LED照度分布，計算適當距離，設計最佳擺放位置，並實際製作一光源板驗證。
驅動電路採用半橋諧振電路，操作在電感性，達到零電壓導通，減少切換損失。LED藉由外加不同反光罩，可產生不同的高斯分布照度，並依照植物所能承受的照度變化，作為LED達到均勻的標準。利用Matlab模擬軟體，建立數學模型，將模型代入最佳化均勻照度公式，計算出最佳均勻照度距離，進行實例驗證。
本文分析驅動電路操作原理、推導方程式與參數設計流程，並實際製作一盞7-W紅光LED燈，考慮照度分布邊界，將實際量測之照度擴充為19顆LED，進行模擬，最後以19顆LED作為光源板擴充，加強驗證此配置方式可於大範圍內產生均勻光照。

This thesis proposes a design method of the plane light source formed by multiple light emitting diodes (LEDs) with luminance uniformity. The LEDs placed in a plane are connected in series and driven by a half-bridge series-loaded resonant inverter. To reduce switching losses, the power MOSFETs of the inverter are designed to be switched on at zero voltage.
The illumination with Gaussian distribution, which can be patterned with different shapes of the reflectors on LEDs, is modeled by the computer software Matlab based on the measured luminance of a single LED. According to the simulated results, the LEDs can be allocated at appropriate positions with optimal distance to obtain the uniform illumination for an LED plane.
A driving circuit is designed for a 7-W LED lamp, which is formed by 7 1-W LEDs in series. The measured illumination is extended to 19 LEDs to examine the uniform distribution of the LED lamp over a larger area.

論文審定書 i
誌謝 ii
摘要 iii
Abstract iv
目錄 v
圖表次vii
第一章 簡介 1
1-1 研究背景與動機1
1-2 論文大綱3
第二章 LED 諧振驅動電路4
2-1 諧振驅動電路 4
2-2 工作原理與模式 4
2-3 電路參數設計與推導6
2-4 驅動電路參數設計實例與量測9
第三章 LED 量測與照度分布建模 11
3-1 LED 特性11
3-2 LED 照度量測方式12
3-3 加反光罩單顆LED 測量16
3-4 照度分布建模 22
第四章 LED 配置 26
4-1 均勻化照度與距離26
4-2 實例驗證30
4-3 均勻照度LED 設計流程 36
第五章 結論與未來研究方向 38
5-1 結論與討論 38
5-2 未來研究方向 39
參考文獻 40

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