- 學位論文
發光二極驅動器研製
Implementation of Light Emitting Diode Drive Circuit with Buck-Boost Converter
摘要
因全球能源短缺，各國紛紛致力於節能，而LED是照明中的省能裝置之一。LED產品與一般照明比較其價格仍舊過高，本論文乃提出以簡單方法驅動LED，俾使其相關產品價格降低。 本論文主要探討具有昇壓與降壓之昇降壓轉換器，使用LED規格之順向偏壓為3.1~4.3V、順向電流為0.7A。本論文提出驅動6個串聯之3W白光LED，單一LED額定電壓4V、電流0.6A，分別操作於降昇壓之連續模式與不連續模式，並以Isspice輔助軟體模擬出結果加以比較。 因LED使用時其內阻會隨著溫度而改變，乃以閉迴路電壓控制模式驅動LED。本論文首先完成電路架構及工作模式，並以狀態空間平均法導出穩壓控制器之最短穩壓時間所需轉移函數，並使用MATLAB加以模擬。最後，由實驗結果證明所提方法確實可行並可將輸出電壓控制於24V。
並列摘要
Since the global energy shortages, countries are committed to saving energy. The LED is one of the equipment for energy conservation. Because of the higher cost of the LED product, which compared with the general lightings, this dissertation proposes the driver of LED by the simple way, so as to lower the LED product price. The Buck-Boost converter would be study in this thesis. The specification of LED used which the voltage is 3.1~4.3V, the current is 0.7A. The circuit proposed would be drove on the load which constructed with 6 series white light LED in 3W/pc. It would be operated in 4V and 0.6A for each LED. And it would be operated with continue- and discontinue-mode of Buck-Boost individually. These results simulated by the Isspice software to be compared. Because of the various resistance of LED by the temperature, the closed-loop controller of voltage would be used in the circuit proposed. The circuit scheme and operation mode would be done first in this thesis. To make use of the state-space averaging method to export the shortest time required of the stabilizer, and be simulated by the MATLAB. Finally, it is feasible from the experimental results, and is available at the output voltage controlled 24V.