傳統切換式電源轉換器研製之設計流程複雜，造成研發成本上的增加，且架構採取硬式切換方式，伴隨而來的是產生嚴重的電磁干擾與轉換效率低落等情形。本文原型電路以邊界導通模式升壓型功率因數修正器做為前級穩壓器，降低後級功率開關動態導通損失並減少諧波干擾，且實現零電流導通；後級準諧振返馳式轉換器具有電壓波谷切換特性，降低切換損耗和雜訊，同時保有傳統返馳式轉換器具有電路隔離、拓樸簡單、低成本等特性。
本論文結合實作與理論分析並提供步驟性的電路設計流程，藉由模擬軟體SIMetrix/SIMPLIS建置高擬真電源IC模組，並進行電路模擬且提供各項效率改善方案與分析，以利於使用者了解並設計本文電路架構，縮短系統設計時間；最後實作一90W具功率因數修正之準諧振返馳式交流/直流電源轉換器，其交流輸入電壓範圍90V至265V，最高功率因數達0.99，效率最高可達91.41%，最低待機損耗42mW，其效能符合各項新型節能法規。

In tradition, the designing procedures in developing switch-mode power supplies are complicated and it will cause higher costs. The hard switching mode topologies are also leading to a serious electromagnetic interference and low conversion efficiency. In this thesis, the prototype electrical circuit has an AC/DC pre-regulator which is a boost power factor correction and is operated at boundary conduction mode in the front-end. It can reduce DC/DC conduction loss of power switch, decrease harmonic interference, and accomplish zero current turn-on. There is a DC/DC Quasi-Resonant Flyback converter which owns a voltage valley-switching characteristic. By this characteristic, it can reduce switching loss and noise, and in the mean time, it still keeps the advantages of the conventional Flyback converter like electrical isolating, simple topology, low costs and other characteristics.
This thesis combines the implementation and the theoretical analysis and provides step by step in designing procedures of electrical circuit by simulated software of SIMetrix/SIMPLIS that establishes high simulation of power IC module. It offers the simulation of the circuit, the plan of improving efficiency and the system analysis. In other words, it helps users to comprehend this thesis about electrical circuit structures and designs. It will shorten the time of system designing. Finally, this thesis implemented an AC/DC converter rated at 90W with Quasi-Resonant Flyback Converters and Power Factor Correction, which has wide input voltage range between 90V to 265V, the 99% high power factor, the 91.41% high efficiency and the 42mW low power loss at standby mode. It also satisfied every new type of energy saving regulations.

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