目前大多數交流-直流電源轉換器多採用兩級串接架構方式，由一個功率因數修正器與直流-直流電壓轉換器組成，以達成高功率因數交流-直流電源轉換器。但因為採用兩級電路架構，在電路規劃與元件使用數量需求較高，效率提升也有限。
傳統平均電流控制法為了降低輸入電流失真故其輸出電壓迴路頻寬不宜過大，因此輸出電壓之漣波抑制效果並不理想，尤其是二次諧波頻率成分之漣波。本文以傳統平均電流控制為基礎，研製一組單級主動箝位返馳式功率因數轉換器，以雙迴路控制法改善上述缺點。電流環迴路控制使輸入電流追隨輸入電壓波形，用來達成高功率因數。輸出電壓環迴路以變頻方式讓輸出電壓穩壓，此方法可讓電壓環迴路不受頻寬限制，因此可提高電壓迴路頻寬，藉此降低輸出電壓漣波。
本文將以單級主動箝位返馳式功率因數轉換器為架構，介紹功率因數的控制方法以及主動箝位返馳式的動作原理，並完成一輸入交流電壓110Vac，輸出直流電壓48Vdc，輸出功率80W之電源轉換器，透過實際電路量測，驗證理論成果。

At present, most AC-DC converters adopt a two-stage serial connection architecture, which consists of a power factor corrector and a DC-DC voltage converter to achieve a high power factor AC-DC power converter. However, because of the two-stage circuit, there is a high demand for circuit planning and component usage, and efficiency improvement is limited.
In order to reduce the input current distortion, the traditional average current control method should not be too large in the output voltage loop bandwidth, so the chopping suppression effect of the output voltage is not ideal, especially the chopping of the second harmonic frequency component. Based on the traditional average current control, this paper develops a set of single-stage active clamp flyback power factor correction converters to improve the above shortcomings by the dual-loop control method. Current loop control allows the input current to follow the input voltage waveform for high power factor. The output voltage loop circuit regulates the output voltage by frequency conversion. This method can make the voltage loop loop not limited by the bandwidth, thus increasing the voltage loop bandwidth, thereby reducing the output voltage ripple.
In this thesis, the single-stage active clamp flyback power factor correction converter is used as the architecture to introduce the power factor correction control method and the active clamp flyback type operation principle, and complete an input voltage of 110Vac, output voltage of 48Vdc, and output power 80W power converter verifies the theoretical results through actual circuit measurement.

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