本論文研製一數位式具初級側調節功能之準諧振返馳式轉換器，準諧振的控制方式改善了傳統返馳式轉換器功率開關操作在硬性切換的缺點，並且透過數位式的初級側調節回授功能，以初級側的信號偵測輸出負載狀況，達到定電流與定電壓控制，可以省去次級側回授電路元件，進而解決元件壽命與功耗問題。
在本論文中詳細分析了返馳式、準諧振返馳式的電路架構，再依其動作原理進行詳細的數位系統規劃，並說明以數位的方式實現初級側調節的功能，最後實作一台60 W、具初級側調節功能之準諧振返馳式轉換器，其最高效率可達到93.04 %。

This thesis implements a digital quasi-resonant (QR) flyback converter with primary side regulation (PSR) function. The QR control method improves the disadvantage of hard switching for the conventional flyback converter. Through the digital PSR feedback function, it is possible to detect the output load condition for constant current control and constant voltage control. The secondary side feedback elements can be eliminated, and thus to solve the problem of component life and power consumption.
In this thesis, circuit topologies of the flyback converter and its QR counterpart are analyzed in detail. According to the operating principles, the digital system planning is thoroughly executed. The PSR function is achieved by a digital controller. Finally, a 60-W QR flyback converter with PSR feature is implemented with its maximum efficiency up to 93.04%.

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