本文提出一驅動白光發光二極體(Light-Emitting Diode, LED)之獨立型太陽能電能轉換電路。負載所需電力來源以太陽能電池為主，蓄電池為輔。在太陽能電池產生功率不足以供應負載需求時，由蓄電池放電補足負載功率；在太陽能電池產生功率充足時，可將供應負載後多餘的能量儲存到蓄電池，達到充分運用太陽能電池所產生能量的目的。
電能轉換電路由一個升壓轉換器及一個雙向轉換器組成。電路之運作根據不同的LED照明需求、日照強度變化與蓄電池狀態，區分為五個狀態。在各個狀態中，藉由脈波寬度調變(Pulse Width Modulation, PWM)調整各主動功率開關之導通率，達到太陽能電池、蓄電池與負載LED間功率調節。本文分析各狀態中各模式電路操作的原理，推導設計方程式，據以設計一由13顆高亮度白光LED串聯而成之15 W實驗電路，測試驗證理論分析與各項功能。實驗結果顯示，電能轉換電路可依照不同狀況，分別操作於各個狀態，效率均可達到88 %以上。

A stand-alone photovoltaic power conversion circuit is proposed for driving the white Light-Emitting Diode (LED) lamps in series, which is powered by a solar-cell panel with a subsidiary battery set. In the case that the generated power from the solar-cell panel is insufficient for the load, the battery set has to be discharged to complement the required load power. When adequate power is obtained from the solar-cell panel, the excess energy can be stored in the battery set, to make full use of the generated solar power.
The power conversion circuit consists of a boost conversion and a bidirectional conversion circuit. According to the load requirements under different sunlight intensities and battery status, the operation of the power conversion circuit is analyzed by five operation states to derive the design equations. The power coordination among the solar-cell panel, the battery set and the LED lamp is made by adjusting the duty-ratios of the corresponding active power switches. A laboratory circuit designed for a 15-W lamp with 13 LEDs connected in series is built and tested to verify the theoretical analyses and circuit functions. Experimental results have shown that the power conversion circuit can be effectively operated in each state under different conditions. The measured power conversion efficiency is always higher than 88 %.

摘要 i
Abstract ii
目錄 iii
圖目錄 v
表目錄 vii
第一章 緒論 1
1-1 研究背景 1
1-2 研究動機 2
1-3 論文大綱 4
第二章 太陽能電池與白光LED介紹 5
2-1 太陽能發電系統 5
2-2 太陽能電池簡介 7
2-3 蓄電池簡介 10
2-4 發光二極體 11
第三章 電路架構分析 14
3-1 電路架構 14
3-2 電路工作狀態 16
3-3 工作狀態分析 25
3-3-1 狀態I-蓄電池單獨供電 25
3-3-2 狀態II-太陽能電池與蓄電池同時供電 27
3-3-3 狀態III-太陽能電池供電並對蓄電池充電 32
3-3-4 狀態IV-太陽能電池單獨供電 35
3-4 功率調節 38
第四章 實例驗證 42
4-1 量測系統與電路參數 42
4-2 實驗量測 46
第五章 結論與未來研究方向 53
5-1 結論 53
5-2 未來研究方向 54
參考文獻 55

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