本論文主要介紹現今類比以及數位控制實現返馳式之一次感測高功因修正電路，其中又以具功因修正之固定導通控制法具有架構簡單以及低成本的特性，因此為本論文所採取方式。
而本論文也針對具功因修正之固定導通控制法使用在返馳式架構會有功因修正不佳的問題，因此藉由偵測輸入電壓搭配簡單加法器將THD改善。另外，此系統在輸入瞬時低壓以及空/輕載的情況下會有一次側無法感測及系統切換頻率過大的問題，因此利用限頻機制來避免此問題。
最後，本論文為一個混合訊號系統，利用FPGA開發版Altera DE1完成數位Verilog實現，並搭配類比外掛元件DAC800 類比數位轉換器、uA741 運算放大器、AD7822 數位類比轉換器以及LMV762 比較器完成閉迴路系統控制。
此系統的輸入電壓操作範圍為90-264Vac，輸出電壓為36V，滿載輸出功率36W，THD最佳為3.925%，PF最佳為0.9991，轉換效率最高為84.2%

This paper proposed a power factor correction(PFC). A Variable On-Time Control and Primary Side Sensing(PSS) for a critical conduction mode isolate Flyback power factor correction is used in this paper. A Variable On-Time Control have low Total Harmonic Distortion(THD) and high Power Factor(PF) compared to traditional Constant On time Control. In additional to that, the PSS can sense output voltage by auxiliary wind without using additional optocoupler. The specification is applied to an input voltage 90~264Vac, Output power 36W, Output voltage 36V. Finally, this paper give the experimental result for verification whole system by Field-Programmable Gate Array(FPGA). The experimental result shows the THD is less than 10% and Power Factor is higher than 0.95.

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