本文旨在研究兩級式電能轉換器之傳導性電磁干擾問題，前級是將交流電壓轉成直流電壓且具有功因修正之功能，其架構為傳統橋式整流加上昇壓式轉換器；後級再將直流電壓轉成負載所需之直流工作電壓，其架構為返馳式轉換器。基於電磁干擾防制規範的限制下，電磁干擾問題會延誤產品上市的時間，若在電路未完成以前就先掌握電路之電磁干擾問題，於事前先作分析及改善，即可省去重新設計電路或修改電路的麻煩，同時可以增加設計電路時的成本效益與時間效率。為了達到此目的，本論文提出一套有系統的分析及模擬的方法，於電源供應器設計之初，考慮實際量測之傳導性電磁干擾頻段為150kHz〜30MHz，依照各個元件在此頻段內的實際高頻特性，分別建立主動元件、被動元件及印刷電路板導線之高頻模型，結合電源傳輸阻抗穩定網路模型之後，將完成傳導性電磁干擾模擬系統，最後將模擬所得到的雜訊與實際量測的雜訊做比較，因此可以事先預測電磁干擾問題，對於節省解決電磁干擾問題之時間及成本將有很大的幫助。

The purpose of this thesis is to investigate conducted electromagnetic interference issues in two-stage converters. The pre-stage is for power factor correction from AC voltage to DC voltage and the structure is the circuit of conventional bridge rectification with a boost converter added. The post-stage circuit is functioned to transform from DC voltage to the rated DC voltage of load with the structure of flyback converter. According to electromagnetic interference regulations, the problematic electromagnetic interference may delay products reaching the market. If the electromagnetic interference problem analysis and improvement can be controlled before the circuits are done, it will definitely avoid unnecessary re-design or modifying circuits. Cost and time efficiency can both be improved. To reach this goal, this research proposes a systematic analysis and simulation method.
At the beginning design stage of switching mode power supplies, conducted electromagnetic interference frequency band leveled at 150kHz~30MHz is considered. According to the actual high-frequency characteristics for each component within the said frequency band, the high-frequency models for active components, passive components and the printed circuit board are established separately. The models are then combined with the line impedance stabilization network model, to accomplish the conducted electromagnetic interference simulation for the circuit system of two-stage converters. Finally, simulated and measured EMI noises are compared. Thus, the problematic electromagnetic interference can be predicted. This is very helpful to save time and cost caused by electromagnetic interference problems.

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