臺灣博碩士論文加值系統

本篇論文介紹返馳式轉換器之兩種不同型式的柔性切換電路。此兩種不同型式的柔性切換，分別為主動箝制型返馳式轉換器與可變頻率型返馳式轉換器。主動箝制型返馳式轉換器共需要用到兩個功率電晶體切換開關及外加漏感與隔離變壓器等。而可變頻率型返馳式轉換器則不需要以上的外加元件。相同的是兩者都是用諧振的方式來達到柔性切換的目的。本文除詳述系統電路中各部份之電路原理外，更利用電腦模擬軟體PSpice及Matlab 來加以驗證。

This thesis introduces two types of soft-switching circuits and applied to flyback converter. These two different types of the soft-switching are active clamp flyback converter and variable frequency flyback converter. The active clamp flyback converter needs two switching power transistors, external leakage inductance and isolating transformer. The variable frequency flyback converter does not need the former external components. Both of them use resonant circuits to achieve the soft-switching. This thesis not only describes the system circuit principle but also verifies the theory by PSpice and Matlab software.

中文摘要 ----------------------------------------------------- I
英文摘要 ---------------------------------------------------- II誌謝 ------------------------------------------------------- III目錄 -------------------------------------------------------- IV圖目錄 ------------------------------------------------------- V符號檢索 --------------------------------------------------- VII
一、 緒論-----------------------------------------------------1 1-1 研究背景與動機-------------------------------------------1
1-2 內容簡介------------------------------------------------- 2二、 返馳式轉換器--------------------------------------------- 3
2-1 隔離返馳式轉換器------------------------------------------3
2-2 返馳式轉換器交換電晶體------------------------------------5
2-3 返馳式轉換器變壓器─扼流圈-------------------------------6 2-4 返馳式轉換器的變壓器─扼流圈設計-------------------------8 2-5 高頻用的變壓器的設計------------------------------------- 13
三、 主動箝制型返馳式轉換器的操作原理與特性------------- 15
3-1 主動箝制型返馳式轉換器的操作原理與特性----------------- 15
3-2 主動箝制型返馳式電路之特性---------------------------- 17
3-3 主動箝制型返馳式轉換器之基本電路架構--------------- 17
3-4 電路說明與公式推導--------------------------------- 18
3-5 電路模擬---------------------------------------------- 37
3-6 主動箝制型返馳式轉換器之連續電流模式----------------- 39
四、 IC電路模擬(UCC3580)與應用模擬-------------------- 42
4-1 IC模擬------------------------------------------------- 42
4-2 整體電路模擬-------------------------------------- 49
4-3 模擬暫態下之情形-------------------------------------- 53
4-4 輸出15伏特之模擬------------------------------------- 58
4-5 模擬結果討論------------------------------------------- 64五、 返馳式轉換器之可變頻率柔性切換---------------------- 65
5-1 可變頻率柔性切換之原理------------------------------ 65
5-2 電路模擬------------------------------------------- 68
六、 結論------------------------------------------------- 75
參考文獻 ---------------------------------------------------- 76

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