臺灣博碩士論文加值系統

本文提出一個具低輸入電流漣波與開關電壓箝制之隔離型Zeta轉換器。本文利用一種無損耗緩衝電路以降低輸入電流漣波且達到開關電壓箝制功能。返馳式轉換器有輸出與輸入電流漣波大等缺點，而順向式轉換器雖具有較低輸出電流漣波，但需去磁電路以防止變壓器飽和。隔離型Zeta轉換器因輸出電流漣波低且無需去磁電路，但仍存在漏感所產生的電壓突波問題，因此本文利用一種無損耗緩衝電路解決此問題。此無損耗緩衝電路除了可降低輸入電流漣波之外，亦可降低二次側二極體的峰值電流。本文探討上述轉換器架構與緩衝電路，然後詳細分析本文所提電路動作原理，最後實際設計輸入電壓為140~170 V，輸出為12 V/10 A之電路雛型以驗證本文所提電路之可行性。

This thesis proposes an isolated zeta converter with low input current ripple and switch voltage clamping. The proposed circuit utilizes a type of the non-dissipative snubber to reduce input current ripple and clamp switch voltage. A conventional flyback converter has the high input current ripple and high output current ripple. Although a conventional forward converter has the low output current ripple, it needs the demagnetization circuit to prevent the saturation in the transformer. Thus, the thesis chooses an isolated zeta converter. Because the isolated zeta converter doesn’t require the demagnetization circuit. The isolated zeta converter also has the low output current ripple. But the isolated zeta converter still has the voltage spike from the resonant circuit which consists of the leakage inductor and parasitic capacitor Coss, so the thesis utilizes a type of the non-dissipative snubber to clamp the switch voltage. This non-dissipative snubber can reduce not only the input current ripple, but also the peak current of the secondary diode. The thesis discusses the above converter topologies and snubber circuits, and then the thesis detailedly analyzes the operating principle for the proposed circuit. Finally, the thesis implements the circuits with 140~170 V input and 12 V/10 A output. The results of the thesis prove that the proposed circuit is feasible.

目錄
致謝 I
摘要 II
Abstract III
目錄 IV
圖目錄 V
表目錄 IX
第一章 緒論 1
1.1 研究動機與目的 1
1.2文獻探討 2
1.3 論文大綱 3
第二章 轉換器架構與緩衝電路介紹 4
2.1轉換器架構介紹 4
2.1.1 返馳式轉換器 4
2.1.2 順向式轉換器 5
2.1.3 隔離型Zeta轉換器 7
2.2 緩衝電路介紹 8
2.2.1 RCD緩衝電路 8
2.2.2 無損耗LC緩衝電路 9
2.2.3 無損耗緩衝電路type 1 10
2.2.4無損耗緩衝電路type 2 11
2.3 本文所提電路簡介 12
第三章 具低輸入電流漣波與開關電壓箝制之隔離型Zeta轉換器 13
3.1 非隔離型與隔離型Zeta轉換器簡介 13
3.1.1 非隔離型Zeta轉換器 13
3.1.2 隔離型Zeta轉換器 14
3.2 本文所提電路增益式與動作分析 15
3.3本文衍生之電路 29
第四章 設計實例 30
4.1 本文所提電路設計流程 30
4.2 實驗量測波形與討論 43
4.2.1 本文所提電路實驗波形探討 43
4.2.2 比較與探討本文所提電路與RCD緩衝電路實驗波形 54
4.3實驗結果分析與討論 62
第五章 結論與未來展望 65
5.1結論 65
5.2未來展望 65
參考文獻 66

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