本論文旨在研製一高升壓比直流-直流轉換器，可應用於需要高升壓比的場合。本電路採用正向串接的架構，優點在於電路架構簡單、元件數目少、控制方便等，且於責任週期操作於0.7的範圍內即可得到8倍以上的升壓比。本文首先將介紹此高升壓比直流-直流轉換器的操作模式，並分析其動作原理。最後，研製出一輸入電壓50 V、輸出電壓400 V、功率2000 W、效率90 % 的高升壓比直流-直流轉換器，並由實驗結果驗證理論分析之可行性。

In this thesis, a high step-up ratio boost converter is investigated and implemented. This circuit can be used in the situation requiring high step-up conversion ratio. It uses positive cascade structure to achieve the high step-up conversion ratio requirement. The advantages of the circuit include simple structure, small component count, and easiness to control …etc. Moreover, when duty cycle operates below 70%, the step-up conversion ratio can be more than 800%. This thesis will firstly introduce the operation mode of the high step-up ratio boost converter and analyze its operation theory. Finally, a 50 V input voltage, 400 V output voltage, 2000 W output power and a efficiency higher-than 90% efficiency high step-up ratio boost converter is designed and implemented to verify the feasibility of this high step-up ratio boost converter circuit.

[1]鄭詩程，光伏發電系統及控制的研究，合肥工業大學，博士學位論文，2005年。
[2]J. Wen, T. Jin, and K. Smedley, “A new interleaved isolated boost converter for high power applications,” 21st Annual IEEE Applied Power Electronics Conference and Exposition, vol. 24, no. 6, pp. 1506-1514, Jun. 2006.
[3]Z. Qun and F. C. Lee, “High-efficiency and high step-up DC/DC converters,” ICPE 7th International Conference on Power Electronics, vol. 3, no. 5, pp. 65-73, 2007.
[4]W. Li, X. Lv, Y. Deng, J. Liu, and X. He, “A review of non-isolated high step-up DC-DC converters in renewable energy applications,” 24th Annual IEEE Applied Power Electronics Conference and Exposition, vol. 67, no. 9, pp. 364-369, 2009.
[5]W. Li and X. He, “Review of nonisolated high-step-up DC-DC converters in photovoltaic grid-connected applications,” IEEE Transactions on Industrial Electronics, vol. 58, no.4, pp. 1239-1250, 2009.
[6]B. J. Won, “High boost converter using voltage multiplier,” 31st Annual Conference of IEEE Industrial Electronics Society, vol. 6, no. 4, pp. 61-68, 2005.
[7]W. Li, X. He, X. Du, and B. Wu, “ General derivation law of non-isolated high-step-up interleaved converters with built-in transformer,” IEEE Transactions on Industrial Electronics, vol. 59, no. 3, pp. 1650-1661, 2012.
[8]W. Li and X. He, “High step-up soft switching interleaved boost converters with cross-winding-coupled inductors and reduced auxiliary switch number,” IET Power Electronics, vol. 2, no. 2, pp. 125-133, 2009.
[9]D. D. Lu, D. K. Cheng, and W. Lee, “A single-switch continuous-conduction-mode boost converter with reduce reverse recovery and switching losses” IEEE Transactions on Industrial Electronics, vol. 50, no. 4, pp. 767-776, 2003.
[10]S. Du, Z. Chen, and L. Chang, “A novel soft-switching two-stage step-up DC/DC converter,” ICPE 7th International Conference on Power Electronics, vol. 10, no. 11, pp. 602-607, 2007.
[11]H. S. Chung, “Design and analysis of a switched-capacitor-based step-up DC/DC converter with continuous input current” IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, vol. 46, no. 6, pp. 722-730, 1999.
[12]G. Sridharan, “Transformerless DC/DC converter for production of high voltage,” Conference Record of the IEEE Industry Applications Society Annual Meeting, vol. 2, no. 1, pp. 1286-1288, 1991.
[13]F. L. Luo and H. Ye, “Positive output cascade boost converters”, IEE Proceedings - Electric Power Applications, vol. 151, note. 5, pp. 590-606, 2004.
[14]O. Lopez, R. Teodorescu, F. Freijedo, and D. G. Ju, “Eliminating ground current in a transformerless photovoltaic application” IEEE Power Engineering Society General Meeting, vol. 10, note. 11, pp. 1-5, 2007.
[15]S. M. Chen, T. J. Liang, L. S. Yang, and J. F. Chen, “A cascaded high step-up DC-DC converter with single switch for microsource applications,” IEEE Transactions on Power Electronics, vol. 26, note. 4, pp. 1146-1153, 2011.
[16]R. J. Wai and R. Y. Duan, “High step-up converter with coupled-inductor,” IEEE Transactions on Power Electronics, vol. 20, no. 5, pp. 1025-1035, 2005.
[17]B. Huang and A. Shahin, “High voltage ratio non-isolated DC-DC converter for fuel cell power,” IEEE Transactions on Power Electronics, vol. 31, no. 9, pp. 1277-1283, 2008.
[18]Y. He and F. L. Luo, “Analysis of Luo converters with voltage-lift circuit,” IEE Proceedings-Electric Power Applications, vol. 152, no. 5, pp. 1239-1252, 2005.
[19]F. L. Luo, “Negative output Luo converters with voltage lift technique,” IEE Proceedings-Electric Power Applications, vol. 146, no. 2, pp. 208-224, 1999.
[20]F. L. Luo and H. Ye, “Ultra-lift Luo-converter,” IEE Proceedings-Electric Power Applications, vol. 152, no. 1 pp. 81-86, 2004.
[21]Y. Jian, F. L. Luo, and M. Zhu, “Voltage-lift-type switched-inductor cells for enhancing DC-DC boost ability: principles and integrations in Luo converter,” IET Power Electronics, vol. 4, no. 1 pp. 131-142, 2011.
[22]F. L. Luo and H. Ye, “Switched capacitor four-quadrant DC/DC Luo-converter,” IAS Annual Meeting Conference Record of the 1999 IEEE Industry Applications Conference, vol. 3, no. 10, pp. 1653-1660 , 1999.
[23]F. L. Luo and H. Ye, “Positive output multiple-lift push-pull switched-capacitor Luo converters,” IEEE Transactions on Industrial Electronics, vol. 51, no. 3, pp. 594-602, 2004.
[24]F. L. Luo, “Positive output Luo converters: voltage lift technique,” IEE Proceedings-Electric Power Applications, vol. 146, no. 4, pp. 415-432, 1999.
[25]F. L. Luo, “Double-output Luo converters, an advanced voltage-lift technique,” IEE Proceedings-Electric Power Applications, vol. 147, no. 6, pp. 469-485, 2000.
[26]J. C. Caro, J. M. Ramirez, and P. M. Vite, “Novel DC-DC multilevel boost converter,” IEEE Power Electronics Specialists Conference, vol. 19, no. 1, p.2146-2151, 2008.
[27]J. C. Caro, J. M. Ramirez, and P. M. Vite, “A DC-DC multilevel boost converter,” IET Power Electronics, vol. 3, no. 1, pp. 129-137, 2010.
[28]R. W. Erickson and D. Maksimovic, “Fundamentals of power electronics,” Second Edition, USA：Secaucus, 2000.
[29]吳義利，切換式電源轉換器：原理與實用設計技術(實例設計導向)，初版，高雄：文笙書局，2012年。
[30]EPARC，電力電子學綜論，第二版，台北：全華圖書，2008年。
[31]Texas Instruments Inc, “TL494 pulse-width-modulation control circuits,” http://www.ti.com/lit/ds/symlink/tl494.pdf, accessed in Oct. 2015.
[32]Texas Instruments Inc, “Basic calculation of a boost converter's power stage,” http://www.ti.com/lit/an/slva372c/slva372c.pdf, accessed in Oct. 2015.
[33] CREE, “C3D20060,” http://www.wolfspeed.com//Creeets/C3D20
060D.pdf, accessed in Oct. 2015.
[34]CSC, “ Powder core ring core catalog,” http://www.mhw-intl.com/assets/CSC/CSC_Catalog.pdf, accessed in Oct. 2015.
[35]N. Mohan, “Power electronics and drives,” Year 2003 Edition, USA: MNPERE, 2003.