臺灣博碩士論文加值系統

本論文主要研製一台具同步整流之數位交錯主動式箝位返馳式轉換器，基於主動式箝位的架構設計，將兩相交錯且同時使用一顆箝位電容，利用箝位電容回收漏感之能量，改良傳統返馳式轉換器主開關應力過高與緩衝器功率損耗之缺點，且此架構擁有全數開關零電壓切換之特性，降低因輸入高電壓應力與高切換頻率產生的切換損失與切換雜訊。再者，本論文所採用之交錯式控制可降低二次側開關傳導損耗與輸出電壓漣波，在電路架構中並使用二次側同步整流來減少開關傳導損失。
本論文對所研製的數位交錯主動式箝位返馳式轉換器之動作原理進行分析與討論，並實際完成輸入直流電壓為380V、輸出直流電壓為24V、切換頻率為150kHz且最大輸出功率為500W之主動式箝位返馳式轉換器。實作電路之控制器核心則是採用德州儀器公司所生產的數位訊號處理器TMS320F28035，經實測結果驗證所研製的數位交錯主動式箝位返馳式轉換器之滿載效率可達95%以上，在本論文中並配合模擬軟體PSIM進行波形驗證與整體電路損失分析。

The purpose of this thesis is to design and implement a digital-controlled and interleaved active-clamp flyback converter with synchronous rectification. Based on the design of active-clamp architecture, the two phases work with interleaved control and use a unique clamp capacitor which recovers the energy from leakage inductance to improve shortcomings such as high switch stress and snubber power loss in the traditional flyback converter. All switches have zero voltage switching (ZVS) characteristics in the implemented active-clamp flyback converter to reduce the switching loss and switching noise. The used interleaved control can reduce conduction loss on the transformer secondary side and output voltage ripple. The designed synchronous rectification is applied to reduce the conduction losses further.
The implemented flyback converter specifies the maximum power 500W, the input voltage 380V, the output voltage 24V and the operation frequency 150kHz. The used controller is DSP TMS320F28035 produced by Texas Instruments. It is verified that the efficiency reaches more than 95% at full load and the waveform and overall circuit loss analysis can be proved with the simulation software PSIM.

摘要 i
ABSTRACT ii
誌謝 iv
圖目錄 vii
表目錄 x
第一章 緒論 1
1.1 研究背景與動機 1
1.2 研究內容 3
1.3 論文大綱 4
第二章 柔性切換技術 5
2.1 硬式切換特性 5
2.2 柔性切換特性與諧振轉換器之分類 6
2.2.1 負載諧振轉換器 7
2.2.2 開關諧振轉換器 7
2.2.3 諧振直流鏈轉換器 7
2.2.4 高頻鏈整半週轉換器 8
第三章 交錯主動式箝位返馳式轉換器之分析 9
3.1 交錯主動式箝位返馳式轉換器動作分析 9
3.2 輸出同步整流技術 16
3.2.1 同步整流之控制訊號 16
3.2.2 同步整流技術之優點 18
3.3 交錯主動式箝位返馳式轉換器之小訊號分析 19
第四章 實驗系統設計 24
4.1 交錯主動式箝位返馳式轉換器之設計 25
4.1.1 一次側功率開關選用 25
4.1.2 二次側同步整流功率開關選用 25
4.1.3 變壓器設計與製作 26
4.1.4 交錯主動式箝位電路設計 29
4.1.5 輸出電容器設計 31
4.2 週邊硬體電路之設計與介紹 31
4.2.1 輸出電壓偵測電路 31
4.2.2 功率開關驅動電路 32
4.2.3 數位訊號處理器簡介 33
4.3 數位控制器之設計 34
4.3.1 補償器設計 35
4.3.2 Z轉換 39
4.4 程式設計流程 40
第五章 電路模擬與測試結果 43
5.1 實驗規格與實驗儀器介紹 43
5.2 電路模擬與實測波形驗證 44
5.3 效率測試數據 61
5.4 損失分析 63
第六章 結論與未來展望 66
6.1 結論 66
6.2 未來發展方向 67
參考文獻 68

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