本文提出新型可置換LED燈，可將現有燈具之T8/40W螢光燈管直接替換成LED燈管。此LED燈管包含頻率偵測電路、LED驅動電路和LED模組，可直接串接至市電、傳統式電磁安定器或預熱型電子式安定器，本文所提出驅動電路之優點為體積小、容易設計濾波器。藉由低通濾波器與比較器以判斷LED替代燈管的輸入電壓的頻率高低。當輸入為低頻時，將LED串接之開關S1截止，並利用返馳式轉換器的開關S2的高頻切換以調節LED的電流；當輸入為高頻時，此時返馳式轉換器的開關S2為截止狀態，利用LED串接之開關S1以線性調整LED電流。本論文首先說明所提替代燈管的動作原理，並設計重要的電路參數，再利用模擬軟體驗證所提電路可行性。最後，研製一22 W之LED驅動電路，使其可操作在市電輸入電壓90~264 VRSM，電磁式安定器及電子式安定器驅動。

In this thesis, a novel retrofit LED is proposed to replace the T8/40W fluorescent lamp. The proposed retrofit LED lamp contains a frequency sensing circuits, driving circuit and LED module, which is suitable for AC grid, electromagnetic ballast, and electronic ballast applications. The advantages of the proposed retrofit LED lamp are small size and easy to design. The frequency sensing circuits is constructed of a low-pass filter, peak detector circuit, and voltage comparator to clarify the input voltage frequency of the retrofit LED lamp. When the input voltage is low frequency, the switch S1 series connected with LED is turned off. The switch of flyback converter S2 is used to regulate LED current at high frequency switching. When the input voltage is high frequency, the switch of flyback converter S2 is turned off. The switch S1 series connected with LED is used to regulate LED current linearly. The operational principles of the proposed retrofit LED is analyzed and the key parameters of the proposed retrofit LED are designed. Then, the simulation software is used to verify the feasibility of the proposed retrofit LED lamp. Finally, a 22 W retrofit LED prototype is built in the laboratory for both ballasts and universal AC grid voltage applications.

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