臺灣博碩士論文加值系統

本文利用微控制器與類比控制器，以混和式控制方式實現一可變輸出之移相全橋直流/直流轉換器。轉換器藉由外加諧振電感及兩個箝位二極體的方式，使功率開關達到零電壓切換，並降低責任週期損失、環路電流及開關電壓應力，在變壓器二次側使用同步整流技術降低導通損失，使整體電路效率提高。
本論文使用德州儀器公司的UCC28950類比控制器、瑞薩電子公司的RX-62T微控制器。以類比控制器實現脈波相移調變控制信號及二次側同步整流信號;微控制器輸出一可調變的參考電壓給予移相全橋類比控制器實現可變電壓輸出，藉此提供可程式控制輸出電壓，達到混和式控制，這能使電路能夠操作於高頻、減少元件體積及成本。
文中也將電路的動作原理、設計流程、零電壓切換的操作條件一一作說明。最後，透過實作一1120W的零電壓切換之移相全橋直流/直流轉換器，驗證設計結果是否正確。由實驗結果證明在規格內之輸入電壓及負載條件下，開關能達到零電壓切換；而在20%負載時效率大於80%，且於滿載時，效率也能達到96%，符合能源之星80Plus的綠色能源規範。

A mixed mode control full-bridge dc-dc converter with variable output function is presented on a microcontroller and an analog controller in this paper. The implemented converter achieves zero voltage switching and reduces duty cycle loss, circulating loss and the switching voltage stress by introducing a resonant inductance and clamping diodes. Moreover, the use of synchronous rectification in the secondary side of the transformer actually reduces the conduction loss, and the overall efficiency is improved.
The analog controller, Texas Instruments UCC28950, is adopted to implement phase shift pulse width modulation and synchronous rectification. The Renesas Electronic Microcontroller RX62T is used to perform a variable reference voltage which is sent to analog controller to control output variable voltage. They construct the mixed mode control system with programmable output voltage, so the system could operate on high frequency, and the system size also could be reduced.
This thesis describes the operating principle of the circuit, design procedure of entire circuit and zero voltage switching of operating conditions. And the experimental results show the proposed 1120W zero-voltage switching phase-shifted full-bridge dc-dc converters is workable, moreover, it prove that the power switch can achieve zero voltage switching in the specifications. The efficiency at 20% load is higher than 80% , and at full load, the efficiency can reach 96%. The results confirm that implemented converter actually conforms the standard of Energy Star.

中文摘要 i
ABSTRACT ii
致謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
符號說明 x
第1章 緒論 1
1.1 研究背景 1
1.2 研究動機 2
1.3 文獻回顧 2
1.4 系統架構 4
1.5 內容簡介 5
第2章 全橋式直流轉換器 7
2.1 傳統全橋式轉換器之架構與原理 7
2.1.1 傳統全橋式轉換器架構 7
2.1.2 傳統全橋式轉換器動作原理 8
2.2 變壓器二次側整流電路與同步整流技術 10
2.2.1 二次側整流架構 10
2.2.2 同步整流技術 11
2.3 柔性切換技術 12
2.4 移相式全橋轉換器之架構與原理 15
2.5 責任週期損失與有效責任週期分析 24
2.6 加入箝位二極體之移相全橋分析 26
2.7 小結 33
第3章 整體電路設計 34
3.1 移相全橋轉換器電路規格 34
3.2 主電路元件設計 36
3.2.1 變壓器設計 36
3.2.2 主功率開關選擇 41
3.2.3 同步整流功率開關選擇 42
3.2.4 諧振電感設計 43
3.2.5 輸出電感設計 45
3.2.6 輸出電容設計 46
3.3 混和式可變輸出調變方式 47
3.4 小結 48
第4章 實測結果與分析 49
4.1 功率開關切換信號與同步整流功率開關切換信號 49
4.2 諧振電感大小與零電壓切換負載範圍比較 52
4.2.1 零電壓切換的負載範圍: 52
4.2.2 責任週期損失(Duty loss): 57
4.2.3 整體效率比較: 59
4.3 移相全橋操作於不同電壓範圍之波形圖 60
4.4 同步整流與二極體整流實測結果比較 68
4.5 有無外加箝位二極體之責任週期損失比較 73
4.6 小結 75
第5章 結論與未來展望 76
5.1 結論 76
5.2 未來展望 76
參考文獻 78

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