臺灣博碩士論文加值系統

LED較一般白熾燈泡具備省電、重量輕與壽命長等優點，非常符合可攜式產品各項需求之特性，相較於傳統CCFL背光源，白光LED更符合歐盟要求產品製造過程不含汞、鹵素與或鉛，在進行產品回收時不會破壞環境，故白光LED顯然成為未來最蓬勃發展之背光應用主流，由於目前移動式電子裝置因應終端應用需求，電力消耗量大增，故背光模組消耗功率已受到更嚴苛的要求。
本論文以直流對直流昇壓轉換電路為基礎，研製一高效率白光LED驅動器，並具備過電流、過電壓及低電壓保護，可應用於使用鋰電池做為電源電路之移動式電子裝置，實驗結果顯本論文之高效率昇壓型白光LED驅動器，其效率都保持在80%以上，符合電路預期之性能。

LEDs present many advantages over incandescent light sources including lower energy consumption, light weight, and longer lifetime, etc. It fits the requirements of portable products. And unlike CCFLs, LED-lit monitors contain no mercury, halogen or lead. That makes them safe for the environment when the time comes to recycle them. So the white LED has apparently become the mainstream of backlighting applications in the future. Because of the requirements of complex application, the power consumption is rising.

The more energy-saving backlight module is needed. In this thesis, a high performance boost mode DC-DC converter circuit with protection circuits of over-load, high voltage, and low voltage is developed for driving white LED. This circuit would be used in mobile electronic devices as power supply circuit of lithium batteries. From the experimental results, the performance of this circuit exceeds 80% which agrees with the expected requirement.

摘要 i
ABSTRACT ii
誌謝 iii
目錄 iv
圖目錄 vi
表目錄 ix
第一章 緒論 1
1.1 研究背景與目的 1
1.2 研究方法 4
1.3 論文大綱 5
第二章 白光LED介紹 6
2.1 前言 6
2.2 LED發光原理 8
2.3 LED失效模式 11
2.4 LED使用方式 13
2.5 白光LED種類 13
第三章 白光LED驅動電路 17
3.1前言 17
3.2 常用白光LED驅動方式 20
第四章 電路設計及實驗結果 23
4.1 前言 23
4.2 電路設計 23
第五章 結論與未來展望 45
5.1結論 45
5.2 未來展望 45
參考文獻 46

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