5.1 結論
本論文擬探討一種能夠不使用高電壓電解電容，不需要變壓器轉 能，高功率因子，並且能夠以定電流方式驅動 LED 的驅動方法，此方 法將儘可能積體化成單一晶片，以降低外接元件個數，可節省電子元 件所占的空間。考慮到樣品的可靠度問題，驅動電流採負溫度係數設 計，這種負溫度係數的設計可以避免樣品『熱燒毀』 (Thermal Run Away) 的現象發生。
實驗數據顯示高電壓低電流為主體的 LED 控制與驅動電路可大幅 提高功率因子在 95%以上，而輸入電壓與負載電流的關係與理論及模 擬結果相符，兩者關係有著輸入電源電壓 +/-20%，動電流變異為 -20%
/+10% ；此外輸入電壓與光亮度及輸入功率的變動率為 10%。
另外提供系統層面的安全性防護機制，如突波、過壓及雷極保護…
等等，確保系統能正常運作。
5.2 未來展望
若將照明系統應用模式將由 3 段 2 串改為 6 段 1 串，以下是利用 Hspice 所模擬的特性結果；驅動電流由 40mA 降為 20mA、功率因子約 為 96%(圖 5-1)、總諧波失真由 23.8%降為 11.5%(圖 5-2)。
圖 5-1. 驅動電壓與驅動電流關係圖
而能量轉換效率為 90.5%、光電功效為 104(lm/W)，其中發光二極 體之發光效率為 115(lm/W)。
圖 5-2. 總諧波失真模擬圖
A
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