電源轉換器於許多電動機械的應用中如：馬達、發電機、風扇等在設計時皆有高於常規輸出瓦數之規格需求，通常設計規格會為兩倍至三倍的峰值功率下進行設計。基於磁性元件飽和曲線之特性，電源供應器容易因此因素而失去高功率密度之優點。因此本論文以步階式氣隙之鐵氧體磁芯進行設計與分析，並以Maxwell Analysis有限元素模擬分析軟體進行驗證，最終應用於前級之功率因數修正器之中，達成在保持原體積、效率、iTHD的條件下，將設計於最大功率1 kW之功率因數修正器提升至峰值功率2 kW。

Power converter are used in many electromechanical applications such as motors, generator, high-voltage pumps, etc. which output power is usually designed by the specifications of two or three times than its peak surge power. The engineer should take two to three times of the normal output wattage as peak surge power specification. Based on the saturation curve characteristics of the magnetic element, the power supply is likely to lose the advantage of high power density. This thesis uses stepped air-gap ferrite inductor as PFC choke. And analyze with Maxwell Analysis finite element simulation software for verification. Finally, the original volume, efficiency, and iTHD of the PFC are maintained. And the thesis was upgraded from the maximum power of 1kW to the surge power of 2kW.

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