傳統相移式全橋轉換器(PSFB)運用相移控制的方法來達到功率開關的零電壓切換，藉由穩定性高、構造簡單這幾個優點，因此已被廣泛的運用在高功率的場合，但轉換器存在以下缺點，如：落後臂零電壓切換的範圍限制、二次側振鈴現象、循環電流損失、佔空比損失等缺陷，造成工作在輕載時，轉換器效率不佳。為了改善上述缺點，本文提出了一混合相移式全橋轉換器，運用了共用開關的方式，來結合相移式全橋轉換器與半橋(HB)LLC諧振式轉換器，以確保落後臂在全負載下可以達到零電壓切換，相移式全橋轉換器與半橋LLC諧振式轉換器的輸出端為串聯，轉換器輸出電壓可透過調整相移角大小進行電壓調節。此外於全橋轉換器變壓器二次側加入額外的諧振電路，其優點如下：(1)在電路進入續流模式時，將一次側電流重置至零，減少了循環電流損失，提供落後臂開關達成零電流切換；(2)透過諧振電路的箝位，改善二次側振鈴現象；(3) 續流模式電路迴路的改善，提高能量傳遞的效率。文中將對所提出之混合相移式全橋轉換器動作流程進行分析，設計出適合的電路參數。最後研製出一1000W的混合相移式全橋轉換器實驗原型來驗證所推導出的動作流程、參數設計之可行性，由實驗結果可以得知在輸出功率為200W~1000W間，轉換器效率皆高於90%，並在輸出功率為720W時，最高效率可達96.24%。

The traditional phase-shifted full-bridge converter (PSFB) uses phase-shift control to achieve zero-voltage switching (ZVS) of the switch. It has been widely used in the high power conversion applications due to its high stability and simple structure. PSFB converter has following disadvantages, such as: the limited ZVS range of the lagging leg, secondary side ringing phenomenon, circulating current loss, duty cycle loss and other defects. The converter cannot be operated efficiently at light load condition. To overcome these shortcomings, this thesis proposes a hybrid phase-shift full-bridge converter which uses a shared switch to combine a PSFB converter with a half-bridge (HB) LLC resonant converter to ensure the switches in the lagging leg operating at fully ZVS condition. The output of the PSFB converter and the HB LLC resonant converter are connected in series and the converter output voltage can be adjusted by adjusting the phase shift angle. In addition, an auxiliary resonant circuit is used to the secondary side of the full-bridge converter. The advantages are summarized as follows: (1) During freewheeling period, the primary current is reset to zero, reducing the circulating current loss and the switches in the lagging leg can achieve zero-current switching (ZCS); (2) The secondary side ringing phenomenon is improved by the clamping of the resonant circuit; (3) The efficiency of energy transfer can be improved by the freewheeling period circuit loop. The proposed hybrid phase-shift full-bridge converter operation principle will be analyzed to design suitable circuit parameters. Finally, a 1000W hybrid phase-shift full-bridge converter experimental prototype was developed to verify the principle of operation and parameter design. The experimental results show that the efficiency can be above 90% when the output power range from 200 to 1000W. The maximum efficiency can achieve 96.24% at 720W condition.

摘要......i
Abstract......ii
誌謝......iii
目錄......iv
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 文獻探討......2
1.3 論文貢獻......3
1.4 論文大綱......4
第二章 柔性切換轉換器介紹......5
2.1 前言......5
2.2 硬性切換與柔性切換差異......5
2.3 零電壓切換相移式全橋轉換器......6
2.3.1 零電壓切換相移式全橋轉換器電路架構......6
2.3.2 零電壓切換相移式全橋轉換器動作流程分析......6
2.3.3 零電壓切換相移式全橋轉換器優缺點......10
2.4 零電壓零電流切換相移式全橋轉換器......11
2.4.1 零電壓零電流切換相移式全橋轉換器電路架構......11
2.4.2 零電壓零電流切換相移式全橋轉換器動作流程分析......12
2.4.3 零電壓零電流切換相移式全橋轉換器優點......21
2.4.4 零電壓零電流切換相移式全橋轉換器增益......21
2.5 半橋LLC諧振式轉換器......22
2.5.1 半橋LLC諧振式轉換器架構......22
2.5.2 諧振槽等效模型分析......23
2.5.3 半橋LLC諧振式轉換器諧振頻率......25
2.5.4 半橋LLC諧振式轉換器電壓增益......26
2.5.5 定頻控制模式......27
2.5.6 變頻控制模式......28
第三章 混合相移式全橋轉換器......29
3.1 前言......29
3.2 混合相移式全橋轉換器架構......29
3.3 混合相移式全橋轉換器工作階段分析......30
第四章 硬體電路設計......38
4.1 前言......38
4.2 混合相移式全橋轉換器規格......38
4.3 控制電路......39
4.3.1 混合相移式全橋轉換器控制IC介紹......39
4.3.2 光耦合驅動器......41
4.3.3 直流電源供應電路......41
4.4 混合相移式全橋轉換器設計......42
4.4.1 ZVZCS相移式全橋轉換器電路架構圖......42
4.4.2 ZVZCS相移式全橋轉換器高頻變壓器設計......43
4.4.3 ZVZCS相移式全橋轉換器變壓器漏感設計......43
4.4.4 ZVZCS相移式全橋轉換器諧振電容設計......45
4.4.5 ZVZCS相移式全橋轉換器諧振電感設計......46
4.4.6 ZVZCS相移式全橋轉換器輸出濾波電感設計......46
4.4.7 ZVZCS相移式全橋轉換器輸出電容設計......47
4.4.8 功率開關選擇......48
4.4.9 橋式整流二極體選擇......49
4.4.10 HB LLC諧振式轉換器電路架構圖......49
4.4.11 HB LLC諧振式轉換器高頻變壓器設計......49
4.4.12 HB LLC諧振式轉換器諧振槽設計......50
第五章 硬體電路模擬與實驗結果......53
5.1 前言......53
5.2 電路模擬......53
5.3 實驗波形量測......55
5.3.1 轉換器輸出功率320W......56
5.3.2 轉換器輸出功率400W......59
5.3.3 轉換器輸出功率600W......62
5.3.4 轉換器輸出功率800W......65
5.3.5 轉換器輸出功率1000W......68
5.4 轉換器效率......72
5.5 與傳統ZVS相移式全橋轉換器的比較......73
5.5.1 循環電流損失比較......73
5.5.2 落後臂軟切比較......74
5.5.3 PSFB變壓器二次側振鈴現象比較......75
5.5.4 續流迴路比較......76
5.5.5 領先臂ZVS迴路比較......77
5.5.6 佔空比損失比較......78
第六章 結論與未來展望......79
6.1 結論......79
6.2 未來展望......79
參考文獻......81
Extended Abstract......83

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