傳統相移全橋轉換器的整體轉換效率雖較傳統全橋轉換器高，但仍存在一些如能量循環損失、二次側導通率損失以及輕載時效率欠佳等電路上的缺點。為提昇相移全橋轉換器之整體效率，其損失估算與探討更顯重要。傳統相移全橋轉換器損失估算大部分針對電路滿載時的狀況做評估，於輕載時其損失估算方法精確度較差，因此本論文針對損失估算部分來修正，尤其於輕載時的損失估算，本文提出疊代估算方法以降低損失估測誤差，使估算的結果可以更接近實際值。
傳統相移全橋轉換器使用固定的諧振電感，其無法同時滿足輕重載效率皆提升的需求，藉由本文所提出之損失估算方法可得到在不同負載下的所需之最佳諧振電感感值，故本文設計一具可變諧振電感之相移全橋轉換器，其針對負載變動可自動調整三種不同感值。利用此可變諧振電感可加大柔切範圍，在輸出電流較低時功率開關即可達成零電壓切換，而在重載時可降低導通損失，使不同負載下轉換效率皆能提高。本文實現一輸入電壓380V，輸出電壓48V且額定輸出功率480W的可變諧振電感相移全橋轉換器，實驗結果證明本文所提出之可變諧振電感可依負載變動自動調整切換，使其於重載或輕載之轉換效率皆能提高，於輕載時效率最多可提高2.58%，於重載時效率最多可提高1.33%。本文並模擬利用所設計之可變諧振電感相移全橋轉換器於電池充電時，不同殘電量(State of Charge, SOC)下所需之充電能量，其模擬結果顯示，透過所提出之方法約可減少1.35%的充電能量。

Although the overall conversion efficiency of conventional Phase-Shift Full-Bridge Converters (PSFBC) is higher than conventional full-bridge converters, there are some drawbacks on the conventional PSFBCs. The drawbacks might include energy circulation loss, duty cycle loss and low efficiency at light load etc. To improve the overall conversion efficiency of PSFBCs, it is important to effectively and accurately estimate the power loss of PSFBCs. Conventional power-loss estimation of PSFBCs can effectively calculate the power loss conducted at full load; however, it cannot accurately estimate the power loss at light load. Therefore, a new power-loss estimation of PSFBCs including an iterative procedure for power-loss estimation at light load is proposed in this paper to improve the accuracy of conventional power-loss estimation.
PSFBCs often work under a constant resonant inductor; however, this architecture cannot satisfy the improvement of conversion efficiency at light and full loads at the same time. By the proposed iterative power-loss estimation, the optimal resonant inductor under different load conditions can be obtained. Therefore, a variable resonance inductor which can be controlled automatically under different load conditions to improve the efficiency of PSFBCs is then designed in this thesis. Three inductor values are chosen for the proposed variable resonance inductor to increase the soft switching operation range. The Zero-Voltage Switching (ZVS) can be achieved at the light load and the conduction loss at the full load can also be reduced. Therefore, the overall conversion efficiency of the proposed PSFBC can be improved. A circuit prototype of the proposed PSFBC with specification of rated input voltage 380V, output voltage 48V and 480W is implemented in this thesis. Experimental results show that the proposed PSFBC can adjust the inductor values of variable resonance inductor automatically with respect to different load conditions. The conversion efficiency improvement, about 2.58% at the light load and 1.33% at the full load, can be achieved. The proposed PSFBC is also applied to the battery charger under different State of Charge (SOC). The simulated results show that the about 1.35% charging energy can be saved by the proposed PSFBC.

論文審定書 i
誌謝 ii
摘要 iii
Abstract iv
目錄 v
圖目錄 vii
表目錄 xi
第一章 緒論 1
1-1研究背景 1
1-2研究動機 4
1-3論文大綱 7
第二章 相移全橋轉換器簡介 8
2-1相移全橋轉換器 10
2-2相移全橋轉換器之電路動作模式 11
2-3相移全橋轉換器工作週期分析 21
第三章 相移全橋轉換器損失分析 25
3-1相移全橋轉換器切換損失推導 25
3-2相移全橋轉換器導通損失推導 33
3-3相移全橋轉換器損失公式修正 36
3-4可變諧振電感設計 40
第四章 電路設計與控制 45
4-1電路元件設計考量 45
4-1.1變壓器設計考量 45
4-1.2功率開關零電壓導通條件 50
4-1.3諧振電感設計考量 52
4-1.4輸出電感設計考量[15] 53
4-1.5輸出電容設計考量[15] 54
4-1.6功率開關元件選擇 55
4-2周邊電路設計 56
4-2.1隔離驅動電路 56
4-2.2取樣電路設計 56
4-2.3輔助電源設計 58
4-3控制晶片設計 58
4-3.1dsPIC33FJ16GS504數位訊號控制器與MPLAB簡介 59
4-3.2程式設計流程介紹 62
4-3.3 PI控制 64
第五章 實驗及分析結果 65
5-1相移全橋轉換器之測試電路規格 65
5-2實際波形量測 66
5-2.1相移控制訊號測試與基本波形量測 66
5-2.2諧振週期計算與量測 72
5-3效率比較 75
5-4 可變諧振電感控制 78
5-5充電模擬結果 79
5-5.1充電法介紹 79
5-5.2完整充電曲線模擬 81
5-5.3 隨機充電曲線模擬 84
第六章 結論與未來展望 90
6-1結論 90
6-2未來展望 90
參考文獻 92

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