本論文研製可操作於連續導通與不連續導通之一次側控制單級返馳式轉換器，回授電路偵測輔助繞組上的電壓及開關上電流以估算輸出電壓及電流，此方法不需使用二次側的隔離回授元件，具體積小的優點。本論文所使用的演算法可應用於變壓器的磁化電感電流操作於連續導通與不連續導通模式，因此可適用於寬輸入範圍及寬輸出負載變化的應用。最後，本文透過數位控制方式達到功率因數修正，研製一單級返馳式轉換器，輸入電壓為90-264 Vrms，輸出電壓24 V，額定輸出功率為96 W。實驗結果顯示於全域輸入電壓的功率因數皆可達0.93以上，輸出電壓調整誤差與輸出電流調整誤差分別為6.25%與8%，最高效率為88.3%。

In this thesis, primary side regulation (PSR) technology for single-stage flyback converter in discontinuous conduction mode (DCM) and continuous conduction mode (CCM) operations is presented. In the presented primary-side control, the output voltage and current are estimated by sensing the auxiliary winding voltage and the power switch current without the secondary-side output feedback circuits. In this thesis, the algorithm used for PSR allows the magnetizing current to be operated in DCM and CCM. Therefore, the PSR flyback converter is suitable for wide input voltage range and wide output power range applications. Finally, the control algorithm is implemented with the digital control to achieve high power factor with 90-264 Vrms universal input voltage and 24 V/96 W output voltage and rated output power. Experimental results show the power factor is higher than 0.93 and the output voltage control accuracy and output current accuracy are within 6.25% and 8%, respectively under the universal input voltage range conditions. The highest system efficiency is 88.3%.

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