傳統相移式全橋轉換器可透過開關驅動信號的相移控制使得電路開關達到零電壓切換(Zero-Voltage Switching, ZVS)，然其卻存在如一次側循環電流損失(Circulating Energy Loss)、二次側導通率損失(Duty Cycle Loss)、二次側振鈴現象(Parasitic Ringing)與輕載時落後臂不易達到零電壓切換等缺點，也因此傳統相移式全橋轉換器於輕載運轉時其效率不佳。而本論文實現一混合零電壓與零電流切換(Zero-Voltage and Zero-Current Switching, ZVZCS)之相移式全橋轉換器，其於電路之二次側加入一諧振輔助電路，以產生諧振電流，此諧振電流配合原開關脈波寬度調變(Pulse Width Modulation, PWM)驅動信號所產生之電流，可使相移式全橋轉換器之落後臂能達到零電流切換，領先臂達到零電壓切換，並能降低一次側循環電流損失、二次側導通損失與二次側振鈴現象。論文中針對所實現之混合ZVZCS相移式全橋轉換器之動作模式進行分析，並推導其電路參數。實驗結果中實現一480W的混合ZVZCS相移式全橋轉換器雛型，並與傳統式相移式全橋轉換器作效率比較，以驗證本文所提出之架構的可行性。

Conventional phase-shift full-bridge converter can achieve Zero-Voltage Switching (ZVS) at power switches by phase shift control of switches’ driving signal. However, the problems such as freewheeling circulating loss, duty cycle loss, parasitic ringing and hard to achieves ZVS in the lagging leg switches at light load still exist in the conventional phase-shift full-bridge converter. Thus the conventional phase-shift full-bridge converter can not be operated efficiently at light load. This thesis implements a hybrid Zero-Voltage and Zero Current Switching (ZVZCS) phase-shift full-bridge converter. An auxiliary resonant circuit is added to the secondary side of the conventional phase-shift full-bridge converter to generate resonant current. Based on the generated resonant current, the ZVS for leading-leg switches and ZCS for lagging-leg switches can be achieved without modifying the original switches’ driving Pulse Width Modulation (PWM) signals. The freewheeling circulating loss, duty cycle loss and parasitic ringing can therefore be reduced. The detailed operation modes and circuit parameters design for the proposed converter are analyzed in this thesis. A circuit prototype for the proposed ZVZCS phase-shift full-bridge converter with rated power 480W is implemented in this thesis. The performances between the conventional phase-shift full-bridge converter and the proposed ZVZCS phase-shift full-bridge converter are also investigated. Experimental results demonstrate the features of the proposed ZVZCS converter.

論文審定書 i
致謝 ii
摘要 iii
Abstract iv
目錄 v
圖目錄 viii
表目錄 xiii
第一章 緒論 1
1-1研究背景 1
1-2 研究動機 2
1-3 論文大綱 4
第二章 相移全橋轉換器簡介 6
2-1 相移式全橋轉換器 7
2-2相移式全橋轉換器之電路動作模式分析 8
2-3 相移式全橋轉換器的缺點 18
2-3.1 輕載時落後臂無法達到零電壓切換 18
2-3.2 二次側導通率損失 18
2-3.3 循環能量損失 21
2-3.4 二次側振鈴現象 22
2-4改良型相移式全橋轉換器 23
第三章 混合ZVZCS相移全橋轉換器 27
3-1電路架構分析 27
3-2電路操作原理分析 28
3-3混合ZVZCS轉換器優點[28] 41
3-3.1於輕載時落後臂開關可達到零電流切換 41
3-3.2可提高循環模式時之能量傳遞率 42
3-3.3 較小的循環電流損失與導通損失 44
3-4 怠滯時間對ZVZCS相移全橋轉換器之效率影響 45
第四章 電路設計與控制 47
4-1電路元件設計考量 47
4-1.1變壓器匝數比 47
4-1.2變壓器設計考量 48
4-1.2領先臂零電壓導通條件 51
4-1.3落後臂零電流切換條件 53
4-1.4輔助諧振電路設計考量 54
4-1.5整流二極體與諧振輔助二極體的設計考量 56
4-1.6輸出電感設計考量 56
4-1.7輸出電容設計考量 58
4-1.8功率開關元件選擇 59
4-2電路參數設計 59
變壓器設計實例 60
輔助諧振電路設計實例 61
輸出電感設計 62
輸出電容設計 62
4-3周邊電路設計 63
4-3.1隔離驅動電路 63
4-3.2輔助電源設計 64
4-3.3取樣電路設計 65
4-4控制晶片設計 66
4-4.1dsPIC33F16GS504數位訊號控制器與MPLAB簡介 67
4-4.2程式設計流程介紹 70
4-4.3 PI控制 72
第五章 實驗結果 76
5-1電路模擬 76
5-2實際量測 81
5-3缺點改良與效率比較 85
5-4輕載領先臂ZVS改善 89
第六章 結論與未來展望 93
6-1結論 93
6-2未來展望 94
參考文獻 95

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