本研究提出一獨立型太陽能電池供電之發光二極體(Light Emitting Diode, LED)驅動電路。此驅動電路包含一雙向電力電子轉換器，依照不同天氣狀況，系統會適當地分配太陽能電池、蓄電池和LED三者間的功率。本文將此LED驅動電路應用於交通號誌燈與庭園燈，根據太陽能板與LED的電壓-電流特性曲線，規劃太陽能板和蓄電池容量與工作點，分析不同電路操作模式，並推導設計方程式。
交通號誌燈需24小時全時間運作。太陽能板於白晝光照強時，操作於最大功率點附近，直接供應LED，並將剩餘的能量儲存於蓄電池中，若是蓄電池電量可能不足以供給夜晚所需時，LED降載，讓蓄電池儲存更多能量；太陽能板產生功率不足時，則由蓄電池釋出能量，補足LED所需功率。庭園燈則夜晚點亮。太陽能電池電壓需於白天有光照時，先將能量經雙向轉換器儲存至蓄電池，之後再由蓄電池單獨對LED供電，也能夠因應使用者要求決定開關時段或是調光。
本文最後實際製作一驅動電路，驗證理論分析。經實驗證實，電路能夠依照不同狀態操作在不同的模式，有效地分配功率，且效率皆可達到88%以上。在太陽能板直接供應能量給LED時，最高效率可以達到97%。

The research proposes an LED driving circuit with stand-alone photovoltaic (PV) Power. A bi-directional converter is incorporated to adequately distribute powers among the solar-cell panel, the battery and the LED lamp according to the sunshine intensity, the battery state-of-charge as well as the load requirement. The proposed LED driving circuit is applied to two exemplar applications of the traffic light and the garden light. By matching the voltage-current (V-I) characteristic curves, the capacities of the solar-cell panel and the battery are specified to mostly operate the solar-cell panel around the maximum power point.
The traffic light needs to work 24 hours a day. During the daytime with strong sunshine, the solar-cell panel is operated near the maximum power point, providing the LED power and delivering the excess energy to the battery. If the battery might not have enough power to supply what LEDs need at night, then the load shedding and battery can have more power. However, the solar-cell panel doesn't have enough power to the load, the battery set would supply what the load required. The garden lights work at night. All the power from solar-cell panel needs to store in the battery with the bi-directional converter, providing LED power from battery. User also can decide whether turn the garden lights off or dimming.
To verify the theoretical analyses of the LED driving circuit, a laboratory system is set up for experimental tests. The tested results demonstrate that the system can perform the designated functions in accordance with different states. The measured efficiencies are always over 88%. The maximum efficiency is 97% when the solar-cell panel provides power to the LED strings.

論文審定書 i
誌謝 ii
摘要 iii
Abstract iv
目錄 v
圖目錄 ix
表目錄 x
第一章 緒論 1
1-1 研究動機與背景 1
1-2 論文架構 3
第二章 系統架構 4
2-1 驅動電路架構 4
2-2 太陽能電池 6
2-3 發光二極體 8
2-4 磷酸鋰鐵電池 9
2-5週邊硬體電路設計 10
第三章 交通號誌燈設計與實驗 14
3-1系統容量規劃 14
3-2電路工作狀態 19
3-3 工作模式分析 26
3-4 功率分配與電路參數設計 36
3-5實例驗證 39
第四章 庭園燈設計與實驗 46
4-1系統容量規劃 46
4-2電路工作狀態 48
4-3工作模式分析與功率分配 53
4-4實例驗證 57
第五章 結論與未來展望 62
5-1 結論 62
5-2未來研究方向 63
參考文獻 64

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