本論文為研製主僕式準諧振返馳式轉換器，採用通用IC L6561做電路控制並可精簡外部的控制電路。
L6561為峰值電流模式控制[1]，電流模式控制具有快速響應之特性，其誤差放大器的輸出電壓亦可用於調整各相轉換器之輸出電流，使各相轉換器達到均流的目的。此種控制方式不僅簡單，更可使各相轉換器間達到良好的分流率[2]。由變壓器之激磁電感與開關之寄生電容所產生的諧振行為，利用波谷控制法，可以使功率開關具有柔切的特性，能使轉換器的效率有效的提昇。
主僕式準諧振返馳式轉換器的操作原理與設計考量，均在本論文中予以詳細分析及討論，實驗結果證明了此電路的可行性。

This thesis aims to study and design a master-slave quasi-resonant Flyback converter. A commercial control IC L6561 is used to implement and simplify the control circuit. The L6561 IC is a peak current mode controller with fast transient response features. The error amplifier built-in the control IC can be used for adjusting the corresponding phase current to achieve current sharing functionality. The proposed control method is not only simple, but also can achieve well current sharing between phase modules. The resonant behavior between the transformer magnetizing inductor and switch parasitic capacitor is utilized to implement a valley control. Soft-switching on power switches can be achieved and the conversion efficiency can be then significantly improved. The operation principles and design considerations for the proposed master-slave quasi-resonant Flyback converter are analyzed and discussed in detail. Experiment results of a laboratory prototype are shown to verify the feasibility.

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