自本世紀初，世界各國依據安全規開始範設定國家電磁相容性標準(Electromagnetic Compatibility Standard，簡稱EMC)，進行電子產品之電磁干擾測試(Electromagnetic Interference Tests，簡稱EMI），為使產品滿足測試規格，必須使用大量資源進行反覆修正與試驗；近年來隨著電腦科技的進步，電腦輔助工程分析與設計已是大勢所趨，本文提出以電腦模擬方法分析具雙級功率因數修正電路電源供應器之傳導性電磁干擾，先以商用電子電路模擬軟體針對電路建模，其前級是交流轉直流暨具功因修正電路，架構為傳統橋式整流加昇壓式轉換器，其後級為直流轉直流電壓轉換穩壓電路，架構為返馳式電壓轉換器；進而解析各電路元件對影響電磁干擾的重要參數，並對電路做合理的簡化以縮短電腦模擬時間，最後嘗試設計優化之緩振器及雜訊濾波器，進行電源電路雜訊及系統功率因數之各種影響原因之分析與探討，期能對業界設計類同架構之電源供應器提供設計分析之理論基礎。

Since the early days in this century, many countries in the world started establishing national standard of electromagnetic compatibility for conducting electromagnetic interference tests on electronic products. In order to comply with the EMC standards, numerous resources are used on repetitive modifications and experiments so that the electronic products can pass the tests. Recently, with the fast development of the computer technology, the use of computer aided engineering in design and analysis has become a major trend. In this study, computer simulations are adopted for analysis of conducted EMI on power supplies with two-stage power factor correction circuits. The models for the circuits in power supplies were established with the help of simulation tools; meanwhile, the pre-stage consists of AC/DC converters with structure in a diode bridge and a boost converter. Moreover, the post-stage consists of a DC/DC converter with voltage regulation circuits in flyback voltage conversion topology. And, crucial parameterization of EMI influences and simplification of circuit models are studied for saving simulation times. Finally, snubber circuit and EMI filter design have been evaluated for study of the effects on power signal noises and power factor enhancement. The goal is to provide a analytical foundation for similar type of power supplies in the industries.

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