本論文以應用於電動載具的直流充電樁作為研究目標，研製一台輸出電壓範圍從75 VDC到475 VDC、輸出電流範圍從0.5 A到25 A、最大輸出功率3.75 kW之全橋LLC諧振轉換器，透過調頻控制對電路進行降壓控制，在調頻控制無法降低至所需輸出電壓時，使用相移控制拓展輸出電壓的範圍，從而降低至所需輸出電壓，當一次側落後臂開關因相移過度時，導致開關無法達到零電壓切換時，透過本論文提出的預導通同步整流的時間控制，使開關達到零電壓切換，並在極輕載下以突衝模式控制使電路穩定動作。透過本文所提出的預導通同步整流控制，能使全橋LLC諧振轉換器在寬範圍調壓的同時，還保持一次側開關零電壓切換的特性，以減少開關切換時造成的損耗。本文將依序說明全橋LLC諧振轉換器於調頻控制、相移控制，及預導通時間控制下相關公式的推導及電路動作分析，並透過元件參數設計模擬電路的可行性，最終實作出一台最高效率96.8%的轉換器。

This thesis is based on DC charging piles applied to electric vehicle as research objective. It has developed an full bridge LLC resonant converter, output voltage range is from 75 VDC to 475 VDC, and output current ranges is from 0.5 to 25 A, and the maximum output power is 3.75 kW. The circuit step down voltage by frequency modulation con-trol. When the frequency modulation control cannot decrease to the de-sired output voltage, using phase shift control to expand the range of the output voltage, thereby step down voltage to desired output voltage. When the primary switches in lagging leg have excessive phase shift angle, the switches cannot achieve zero voltage switching. The switches achieve zero voltage switching through the addition of the synchronous rectification on-time advance control by this thesis. The circuit is stabi-lized by burst mode control in very light load. Synchronous rectification on-time advance control by this thesis can make the full bridge LLC resonance converter while operating in a wide range of voltage regula-tion, also have the characteristics of the zero voltage switching of the primary switches, achieve reduce power loss caused by switching. This thesis will explain derivation of related formulas and the circuit operation analysis of the full bridge LLC resonance converter in frequency modu-lation control, phase shift control, and on-time advance control. The feasibility of the simulate circuit is shown through the component pa-rameter design, and finally make a converter with maximum efficiency of 96.8%.

[1] 環境變遷研究中心 - 了解與量化人為全球暖化對東亞與台灣氣候與天氣的衝擊, https://www.rcec.sinica.edu.tw/
[2] A. A. Abdullah Al-Karakchi, G. Putrus and R. Das, “Smart EV charging profiles to extend battery life,” in Proc. International Universities Power Engineering Conference, 2017, pp. 1-4.
[3] Z. Xiaodi, S. Yunlian, Y. Junwei, and D. Qing, “The method of charging piles planning in parking lot,” in Proc. IEEE International Conference on Power System Technology, 2016, pp. 1-5.
[4] M. Li, Q. Chen, X. Ren, Y. Zhang, K. Jin, and B. Chen, “The in-tegrated LLC resonant converter using center-tapped transformer for on-board EV charger,” in Proc. IEEE Energy Conversion Congress and Exposition, 2015, pp. 6293-6298.
[5] Jih-Sheng Lai, Hidekazu Miwa, Wei-Han Lai, Nan-Hsiung Tseng, Chi-Seng Lee, Chin-Hone Lin, and Ya-Wen Shih, “A high-efficiency on-board charger utilitzing a hybrid LLC and phase-shift DC-DC converter,” in Proc. International Conference on Intelligent Green Building and Smart Grid, 2014, pp. 1-8.
[6] 吳義利，切換式電源轉換器，初版，高雄：文笙書局，2012年。
[7] 蔡富斌，具同步整流之數位控制半橋串聯諧振轉換器之研製，國立台灣科技大學電子工程系碩士論文，2012年。
[8] 李昀叡，使用寬能隙元件之多階諧振式雙向直流轉換器，國立台灣科技大學電子工程系碩士論文，2019年。
[9] S. De Simone, C. Adragna, C. Spini, and G. Gattavari, “De-sign-oriented steady-state analysis of LLC resonant converters based on FHA,” in Proc. International Symposium on Power Electronics, 2006, pp. 200-207.
[10] Z. Hu, L. Wang, Y. Qiu, Y. Liu, and P. C. Sen, “An Accurate Design Algorithm for LLC Resonant Converters-Part II,” IEEE Transac-tions on Power Electronics, vol. 31, no. 8, pp. 5448-5460, Aug. 2016.
[11] L. Shi, B. Liu, and S. Duan, “Burst-Mode and Phase-Shift Hybrid Control Method of LLC Converters for Wide Output Range Ap-plications,” IEEE Transactions on Industrial Electronics, vol. 67, no. 2, pp. 1013-1023, Feb. 2020.
[12] J. Kim, C. Kim, J. Kim, J. Lee, and G. Moon, “Analysis on Load-Adaptive Phase-Shift Control for High Efficiency Full-Bridge LLC Resonant Converter Under Light-Load Conditions,” IEEE Transactions on Power Electronics, vol. 31, no. 7, pp. 4942-4955, July 2016.
[13] A. K. S. Bhat, “Fixed-frequency PWM series-parallel resonant converter,” IEEE Transactions on Industry Applications, vol. 28, no. 5, pp. 1002-1009, Oct. 1992.
[14] B. Guo, Y. ZhangJ, J. Zhang, and J. Gao, “Hybrid Control Strategy of Phase-Shifted Full-Bridge LLC Converter Based on Digital Di-rect Phase-Shift Control,” Journal of Power Electronics, vol. 18, no. 3, pp. 802–816, May 2018.
[15] G. Liu, Y. Jang, M. M. Jovanović, and J. Q. Zhang, “Implementa-tion of a 3.3-kW DC–DC Converter for EV On-Board Charger Employing the Series-Resonant Converter With Re-duced-Frequency-Range Control,” IEEE Transactions on Power Electronics, vol. 32, no. 6, pp. 4168-4184, June 2017.
[16] Y. Jang, M. M. Jovanović, M. Kumar, J. M. Ruiz, R. Lu, and T. Wei, “Isolated, Bi-Directional DC-DC Converter for Fuel Cell Electric Vehicle Applications,” in Proc. IEEE Applied Power Electronics Conference and Exposition, 2019, pp. 1674-1681.
[17] B. Wang, X. Xin, S. Wu, H. Wu, and J. Ying, “Analysis and Im-plementation of LLC Burst Mode for Light Load Efficiency Im-provement,” in Proc. IEEE Applied Power Electronics Conference and Exposition, 2009, pp. 58-64.
[18] C. Fei, Q. Li, and F. C. Lee, “Digital Implementation of Light-Load Efficiency Improvement for High-Frequency LLC Converters With Simplified Optimal Trajectory Control,” IEEE Journal of Emerging and Selected Topics in Power Electronics, vol. 6, no. 4, pp. 1850-1859, Dec. 2018.
[19] Magnetics, POWDER CORES, 2020
[20] TDK, Ferrites and accessories E65/32/27 Core and acces-so-ries,2018.
[21] TDK, Mn-Zn Ferrite Material characteristics, 2021.