單級不連續電流模式升壓型功率因數修正轉換器,常被使用低功率照明應用上。然而升壓型轉換器輸入電感操作在不連續模式下,電源輸入電流能自動追隨輸入電壓,然而高的儲存電容電壓會產生功率開關上有高的電壓應力。本論文提出連續電流模式SEPIC功率因數修正轉換器用於驅動照明LED燈,本文SEPIC轉換器能夠達到高功率因數、高效率和LED燈電流的調整。本文也針對SEPIC功率因數修正轉換器操作原理和設計上的考慮,加以細節分析和探討。最後建立一部用於驅動照明LED燈之雛型進行測試,並驗證了所提出方法的可能性。
Single-stage boost-type DCM PFC converters are commonly used in low-power lighting applications. The peak source current can be shaped automatically to follow the source voltage as long as the boost inductor is operated in discontinuous conduction mode. However, high DC bus voltage may cause over voltage stresses on the switching devices. In this thesis, a CCM SEPIC PFC converter is studied for driving lighting LED lamps. High power factor, high efficiency, and LED current regulation can be achieved with the proposed SEPIC converter. The operating principles and design considerations for the proposed SEPIC PFC converter are analyzed and discussed in detail. A laboratory prototype has been built and tested to verify the feasibility of the proposed scheme.