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論文名稱 Title |
具容錯功能之可調光LED燈驅動電路 A Dimmable LED Driver with Fault Tolerance |
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系所名稱 Department |
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畢業學年期 Year, semester |
語文別 Language |
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學位類別 Degree |
頁數 Number of pages |
64 |
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研究生 Author |
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指導教授 Advisor |
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召集委員 Convenor |
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口試委員 Advisory Committee |
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口試日期 Date of Exam |
2017-08-21 |
繳交日期 Date of Submission |
2017-09-06 |
關鍵字 Keywords |
升/降壓轉換器、車用照明、容錯、可調光發光二極體驅動電路、發光二極體 light-emitting diode (LED), step-up/down converter, vehicle lamp, fault tolerance, dimmable LED driver |
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統計 Statistics |
本論文已被瀏覽 5673 次,被下載 16 次 The thesis/dissertation has been browsed 5673 times, has been downloaded 16 times. |
中文摘要 |
本研究提出一個應用於車用照明具容錯功能之可調光發光二極體(Light-Emitting Diode, LED)驅動電路。電路架構結合降壓與升壓轉換器,藉由主動開關切換,可因應直流電源電壓變動與LED失效,操作於升壓或降壓模式;並可控制開關導通率,調節LED燈電流。論文首先分析電路升壓與降壓工作模式,推導電路設計方程式,經模擬驗證後,最後實際設計製作額定為16.5 W,由五顆LED串聯之車燈驅動電路。實驗結果證明,本文所提驅動電路具有寬範圍電壓與電流調變功能,可因應直流電源電壓在8 V到13.5 V之間變動;並於LED失效時,啟動容錯機制,切換操作模式,調節輸出電壓與電流。此升/降壓轉換器於輸出電壓越接近輸入電壓時效率越高,轉換效率最高為98.2 %;當輸入與輸出電壓差最大時,效率仍有78.8 %。 |
Abstract |
A dimmable light-emitting diode (LED) driver with fault tolerance for the vehicle lamp is proposed. The conversion circuit of the driver combines a step-down converter and a step-up converter to cope with the variation of the input voltage and to allow for the failure of some LEDs by interchanging the associated active power switches and regulating the duty-ratios. The operation of the proposed step-up/down converter is analyzed, and then the design equations are derived accordingly. With verified simulation results, a laboratory circuit is designed for a 16.5 W vehicle lamp with five LEDs in series, which is powered by a dc source with wide input and output voltage ranges. Experimental results have demonstrated that the LED driver can swap the step-up and step-down functions and adjust the lamp current properly for an input voltage range from 8 V to 13.5 V with the one to five LEDs in operation. A high efficiency can be achieved in the case that the difference between the input voltage and the output voltage is small. The highest efficiency can be as high as 98.2 %. On the contrary, the efficiency deteriorated but remained at 78.8 % in the worst case. |
目次 Table of Contents |
摘要 i Abstract ii 目錄 iii 第一章 緒論 1 1-1 研究背景與動機 1 1-2 論文大綱 4 第二章 LED特性與驅動電路介紹 5 2-1 LED特性 5 2-2 電力電子轉換器於LED驅動電路之應用 9 第三章 驅動電路架構與分析 11 3-1 電路架構 11 3-2 降壓模式工作階段 12 3-3 升壓模式工作階段 15 3-4 降壓模式電路分析與方程式推導 18 3-5 升壓模式電路分析與方程式推導 22 3-6 設計流程 27 3-7 控制電路 29 第四章 電路設計與量測分析 34 4-1 電路參數設計 34 4-2 電路波形量測 36 4-3 容錯機制暫態波形 38 4-4 電路效率 44 4-5 輸出電流漣波因數 47 第五章 結論與未來研究方向 49 5-1 結論 49 5-2 未來研究方向 50 參考文獻 51 |
參考文獻 References |
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