具同步整流輸出之返馳式轉換器

Flyback Converter with Synchronous Rectification

江成忠(Cheng-Chung Chiang)

指導教授 ： 邱煌仁

中原大學/工學院/電機工程研究所/碩士(2006年)

https://doi.org/10.6840/cycu200600706

摘要

摘 要
返馳式轉換器架構由於不需要二次側輸出電感，在成本與體積上具有相對優勢，因此廣泛使用於低功率商業用途。然而，功率損耗大部分集中在二次側二極體整流器以及初級側功率開關上。因此，許多研究都期望能夠開發簡單的電路，有效降低這些功率損耗。本論文提出一種適用於低輸出電壓高輸出電流特性，具有同步整流輸出之返馳式轉換器。其二次側整流器和初級側開關的功率損耗，均能夠顯著地降低。在實現高功率密度特性同時，所研究架構具有簡單電路與低成本的優點。該電能轉換器之電路動作和設計準則，均已詳細地分析與討論。ㄧ部雛型電路之實驗波形，驗證了所提出方法的可行性。

關鍵字

返馳式轉換器 ； 同步整流 ； 功率密度 ； 主動箝位

並列摘要

Abstract
The Flyback converter topology is widely used for commercial low power applications. Its great attraction is that it has no secondary output inductors. The consequent savings in cost and volume is a significant advantage. However, a lot of the power losses are concentrated in secondary diode rectifiers, and primary switches. Research efforts should therefore be focused on the development of relatively simple topologies that can reduce these losses. In this thesis, a Flyback converter with synchronous rectification output is presented for low output voltage and high output current applications. The power losses in the secondary rectification stage and the primary switches can be significantly reduced. The presented architecture exhibits extreme simplicity and lower cost while providing high power density. The detailed operating principles and design criteria for the presented converter are described. Experimental results for a laboratory prototype are shown to verify the feasibility.
Keywords：Active Clamp, Flyback Converter, Synchronous Rectification, Power Density

並列關鍵字

Active Clamp ； Power Density ； Flyback Converter ； Synchronous Rectification

參考文獻

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