臺灣博碩士論文加值系統

本文所提出之具全負載零電壓切換範圍之全橋相移同步倍流直流-直流轉換器，於二次側倍流整流二極體以同步整流技術取代，只需使用簡單之邏輯電路作為同步整流驅動訊號，不須外加複雜之輔助電路，即可實現全負載零電壓切換範圍以及同步整流之優點，此可減低電磁干擾並提升轉換器效率。本文依據轉換器操作於重載至極輕載之模式分為正-連續導通模式、正-臨界導通模式、負-連續導通模式與負-臨界導通模式。藉由理論分析此四種操作模式，探討全橋主開關於全負載下與各元件參數之關係。最後以一輸入電壓為200V，輸出電壓為12V，輸出功率為250W之轉換器，驗證本文所提之具全負載零電壓切換範圍之全橋相移同步倍流直流-直流轉換器之四種操作模式分析之正確性與可行性。

This paper proposed a phase-shifted full-bridge converter with synchronous current-doubler rectifier DC-DC for full-load range zero-voltage-switching (ZVS), the proposed converter only uses synchronous rectifier to replace rectifier diodes in the secondary side of the phase-shifted full-bridge with current-doubler rectifier, and just adopted a simple logic circuit to derive the signal for driving the synchronous rectifier and do not need to add the complicated auxiliary circuit, can achieve the advantages of both the synchronous rectifier and full-load range zero-voltage-switching (ZVS), can reduce electromagnetic interference (EMI) and increase efficiency of the converter. The operation mode of the converter based on full load to extremely light load is divided into positive continuous conduction mode (PCCM), positive boundary conduction mode (PBCM), negative continuous conduction mode (NCCM), and negative boundary conduction mode (NBCM). According to the analysis of the four modes of operation theoretical, the relationship between the major switches of the full-bridge for full-load range and each circuit component parameters of the converter are discussed.
Finally, a prototype of full-load range ZVS phase-shifted full-bridge with synchronous current-doubler rectifier DC-DC converter with an input voltage of 200V, output voltage of 12V, and output power of 250W is developed to verify the correctness and feasibility of this analysis of the four operation modes.

摘要 i
Abstract ii
致　　謝 iii
表目錄 vii
圖目錄 viii
第一章 緒論 1
1.1 研究動機與目的 1
1.2 論文大綱 3
第二章 零電壓切換全橋相移轉換器 4
2.1 外加輔助電路擴展落後臂開關零電壓切換範圍 4
2.1.1 一次側落後臂開關外加輔助耦合電感電路 4
2.1.2 一次側落後臂開關外加輔助開關電路 5
2.1.3 使用兩個高頻隔離變壓器串聯 6
2.1.4 二次側外加飽和電感電路 7
2.1.5 一次側外加輔助電感與輔助電容電路 8
2.2 使用同步整流取代整流二極體 9
2.2.1 自激式同步整流驅動模式 9
2.2.2 外激式同步整流驅動模式 10
第三章 全橋相移同步倍流轉換器分析 12
3.1 全橋相移式零電壓切換倍流轉換器[42] 12
3.2 全橋相移同步倍流轉換器電路分析 14
3.3 PCCM模式 16
3.4 PBCM模式 28
3.5 NCCM模式 40
3.6 NBCM模式 52
第四章 全橋相移同步倍流零電壓切換探討分析 63
4.1 怠滯時間分析 63
4.2 落後臂功率開關零電壓切換分析 64
4.3 最佳之元件參數設計分析 64
4.3.1 區域穩態時間分析 64
4.3.2 匝數比設計 65
4.3.3 濾波電感設計分析 65
4.3.4 諧振電感設計分析 67
4.3.5 容許之怠滯時間設計分析 68
4.3.6 輸出濾波電容設計分析 69
4.4 PBCM臨界值設計分析 69
第五章 電路參數設計 70
5.1 電路設計 70
5.2 曲線圖 72
第六章 實驗結果 74
6.1 控制方式 75
6.1.1 驅動訊號 75
6.1.2 脈波相移調變控制 75
6.2 實驗波形 77
6.2.1 PCCM模式 77
6.2.2 PBCM模式 79
6.2.3 NCCM模式 81
6.2.4 NBCM模式 83
6.2.5 使用整流二極體之落後臂開關零電壓切換臨界 85
6.3 系統效率 87
第七章 結論與未來研究方向 88
7.1 結論 88
7.2 未來研究方向 88
參考文獻 89

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