這篇論文主要是在講述單階功因修正(Single-Stage Power Factor Correction)在發光二極體照明燈具應用上的實現。事實上,此電路的關鍵構想與概念是來自於功率因數(Power Factor)的定義, 也就是說電流必須一直跟隨著電壓。在經過本論文一些建議的設計公式及簡單的電路結構設計之後PF值是可以被預期和適當地被設定的。詳細的操作原理,演算法以及實驗的結果都將提供出來。 而實驗的結果是依實際燈具規格24V 700mA LED down light所量身設計後的實驗數據。最後的實驗結果功因值高達0.980,已滿足美國聯邦政府能源部能源之星" ENERGY STAR "固態照明(SSL)標準規範中商業應用功因必須大於0.9的規定。諧波含量亦符合歐盟所要求的IEC61000-3-2諧波含量標準。
This thesis mainly presents an implementation of a single-stage Power Factor Correction (PFC) scheme for the low power LED light application. As mater of fact, the circuit key idea is from the definition of power factor, that is the input current must follow the voltage all the time. The PF value is predicted and set properly by the proposed design equations and circuit architecture. Detail operation principles, algorithms, and experimental results are offered, and the experimental results based on 24V 700mA LED down light prototype schematic are also provided. The final PF value reaches as high as 0.980 which already satisfied the "ENERGY STAR": PF>0.9 for commercial application. In addition, the current harmonics were passed in IEC61000-3-2, too.