傳統交換式電源轉換器在開關切換過程期間使用硬性切換方式控制主動功率開關，結果導致開關損耗、功率開關損壞以及效率降低。相對的，LLC半橋諧振轉換器設計在諧振頻率下動作，致使儲存在諧振元件上能量得以最佳化利用。在這個共振頻率時，諧振電容電壓與諧振電感電流自然地以最小損耗進行振盪，進而實現主動開關的零電壓切換（ZVS）和零電流切換（ZCS）條件。在典型的LLC半橋諧振轉換器中，使用變頻來調整輸出電壓的控制方法將會本質上地導致軟切特性的遺失。因此，本研究項目提出一種方法，通過調整功率開關之間的相移，在固定頻的操作下完成輸出電壓的調整。由於切換頻率固定在第一諧振頻率點上，所以兩種柔性切換特性得以保持，進而降低損耗與提升轉換器效率。
本論文提出一具寬輸出電壓範圍之交錯式半橋相移LLC諧振轉換器。本轉換器以交錯式半橋LLC諧振電路為主架構，二次側使用混合式全橋整流器進行整流。當LLC諧振轉換器的開關頻率操作在第一個共振頻率時，功率開關可以透過零電壓開關實現軟切換，然而整流二極管則可以實現零電流切換。因此，由於開關損耗的減少，轉換器的效率得到提高。此外，電路的二次側使用混合式全橋整流器，進而降低二次側共用的整流二極體電壓應力與導通損耗。最後所研究電源轉換器使用UC3879作為系統控制核心，完成額定1KW雛型電路。當輸入電壓為400V時，轉換器的主動開關以固定頻率和固定責任周期的模式運作，並且透過調整主動開關驅動信號之間的相移量，實現寬廣的250-450V輸出電壓範圍。實驗結果顯示，交錯式半橋相移LLC諧振轉換器在輸出電壓250V時的轉換效率最高可達93.50%，在輸出電壓450V時的轉換效率最高可達94.01%。

The conventional switched-mode power converter often used a technique that hard switching to control the active switch during the switching process, and resulting in switching losses, switch damage, and decreased efficiency. In contrast, the LLC half-bridge resonant converter is designed to operate at the resonant frequency allows for optimal utilization of the energy stored in the resonant components. At this frequency, the voltage crosses the resonant capacitor, and the current through the resonant inductor naturally oscillate with minimal loss, enabling zero-voltage switching (ZVS) and zero-current switching (ZCS) condition for the active switch. In a typical LLC half-bridge resonant converter, the control method of adjusting the output voltage using variable frequency does inherently result in the loss of soft-switching feature. Therefore, the research topic proposes a method to achieve output voltage regulation under fixed-frequency operation by adjusting the phase-shift between power switches. Since the operating frequency is fixed at the first resonant frequency point, both soft-switching characteristics are maintained, leading to reduced losses and increased efficiency.
This thesis proposes an interleaved half-bridge phase-shifted LLC resonant converter with a wide output voltage range. The converter is based on an interleaved half-bridge LLC resonant circuit, which utilizes a hybrid full-bridge rectifier on the secondary side for rectification. When the switching frequency of the LLC resonant converter operates at the first resonant frequency, the power switch can achieve soft switching through zero-voltage switching, and the rectifier diode can achieve zero-current switching. As a result, the converter's efficiency is improved due to the reduction of switching losses. In addition, a hybrid full-bridge rectifier is used on the secondary side of the circuit, which reduces the voltage stress and conduction losses of the rectifier diodes shared among the secondary side. The final studied power converter employs UC3879 as the system control core to complete the rated 1-KW prototype circuit. When the input voltage to the converter is 400V, the active switch operates in fixed frequency and fixed duty cycle mode, and the wide output voltage range of 250-450V is achieved by adjusting the phase shift between the drive signals of the active switch. The experimental results show that the interleaved half-bridge phase-shifted LLC resonant converter achieves a maximum conversion efficiency of 93.50% at an output voltage of 250V and a maximum conversion efficiency of 94.01% at an output voltage of 450V.

摘要......i
Abstract......ii
誌謝......iv
目錄......v
表目錄......vii
圖目錄......viii
第一章 緒論......1
1.1研究動機及目的......1
1.2文獻回顧......2
1.3全文內編排方式......4
第二章 交錯式半橋LLC諧振轉換器介紹與分析......5
2.1交錯式半橋LLC諧振轉換器介紹......5
2.2硬性切換及柔性切換......5
2.3電路動作原理分析......7
2.4電壓增益特性分析......14
第三章 電路參數設計及周邊電路應用設計......20
3.1轉換器參數設計及元件挑選......20
3.2周邊輔助電路設計......24
第四章 電路控制與電路模擬分析......25
4.1系統架構介紹......25
4.2類比IC控制設計......26
4.3電路模擬與分析......28
第五章 實驗結果分析......46
5.1轉換器元件參數與量測儀器使用......46
5.2交錯式半橋LLC諧振轉換器量測波形......47
5.3效率分析......85
5.4損耗分析......90
第六章 結論與未來展望......97
6.1結論......97
6.2未來展望......97
參考文獻......98
附錄一......100
Extended Abstract......101
Abstract......101
1. Introduction......103
2. Interleaved Half-Bridge Phase-Shifted LLC Resonant Converter......103
3. Parameter Design and Determine......104
4. Experimental Results......105
5. Conclusions......107
6. References......107

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