本文之主要目標是運用TMS320LF2407數位訊號處理器作為控制核心，研製一「電流饋入式全橋高壓轉換器」，將高匝比變壓器的漏感及雜散電容整合至電路之共振槽，降低雜散元件產生之突波造成電路損壞，並使全橋功率開關達到零電流切換。本文首先探討各類全橋轉換器之特性，並分析「電流饋入式全橋高壓轉換器」之動作原理。最後完成輸入電壓400 V，輸出電壓4 kV，輸出功率800 W之電流饋入式全橋高壓轉換器，其滿載效率為88.1 %。

In this thesis, a current-fed full-bridge high-voltage converter that
uses a TMS320LF2407 digital signal processor (DSP) controller is
studied and implemented. The leakage inductance and parasitic
capacitance of the high-turns-ratio transformer are integrated as the
resonant tank of the current-fed full-bridge topology to prevent the circuit
from being damaged by spikes generated from these parasitic components.
The resonant technique is utilized to achieve zero-current switching (ZCS)
operation on the full-bridge switches. The characteristics of the various
full-bridge topologies are discussed, and the operation principles of the
current-fed full-bridge high-voltage converter are analyzed. Finally, a
current-fed full-bridge high-voltage converter with a 400V input and a
4kV/800W output is implemented. Experimental results show that
efficiency of the high-voltage converter is 88.1% at the full-load
condition.

[1] M. Ilic, L. Laskai, J. L. Reynolds, and R. Encallaz, “An isolated high-voltage DC-to-DC converter with fast turn-off capability for X-ray tube gridding,” IEEE Trans. on Industry Applications, Vol.38, no. 4, pp. 1139-1146, July-Aug. 2002.
[2] R. Gules and I. Barbi, “Isolated DC-DC power converters with high-output voltage for TWTA telecommunication satellite applications,” in Proc. IEEE APEC'01, 2001, pp. 296-302.
[3] M. A. Perez, C. Blanco, M. Rico, and F. F. Linera, “A new topology for high voltage, high frequency transformers,” in Proc. IEEE APEC'95, 1995, pp. 554-559.
[4] Q. Jinrong, A. Khan, and I. Batarseh, “Turn-off switching loss model and analysis of IGBT under different switching operation modes,” in Proc. IEEE IECON’95, 1995, pp. 240-245.
[5] K. Wang, F. C. Lee, G. Hua, and D. Borojevic, “A comparative study of switching losses of IGBTs under hard switching, zero voltage switching and zero current switching,” in Proc. IEEE PESC'94, 1994, pp. 1196-1204.
[6] C. Y. Inaba, Y. Konishi, and M. Nakaoka, “High frequency transformer-assisted passive soft switching PWM DC-DC converter with energy recovery for compact auxiliary power supply in rolling stock transportation,” in Proc. IEEE IAS'03, 2003, pp. 1906-1911.
[7] Abraham I. Pressman, Switching Power Supply Design, 2/E McGraw-Hill Co. New York, 1999.
[8] S. D. Johnson, A. F. Witulski, and R. W. Erickson, “Comparison of resonant topologies in high-voltage DC applications,” IEEE Trans. on Aerospace and Electronic Systems, Vol. 24, no. 3, pp. 263-274, May 1998.
[9] J. Sun, H. Konishi, Y. Ogino, E. Chu, and M. Nakaoka, “Series resonant high-voltage PFM DC-DC converter with voltage multiplier based a two-step frequency switching control for medical-use X ray power generator,” in Proc. IEEE IPEMC’00, 2000, pp. 596-601.
[10] R. L. Steigerwald, “A comparison of half-bridge resonant converter topologies,” IEEE Trans. on Power Electronics, Vol. 3, no. 2, pp. 174-182, Apr. 1988.
[11] J. A. Martin-Ramos, J. Diaz, A. M. Pernia, M. J. Prieto, and F. F. Linera, “A large-signal model for the PRC-LCC resonant topology with a capacitor as output filter,” in Proc. IEEE CIEP’02, 2002, pp. 55-60.
[12] E. X. Yang, F. C. Lee, and M. M. Jovanovic, “Small-signal modeling of LCC resonant converter,” in Proc. IEEE PESC’92, 1992, pp. 941-948.
[13] 李文凱，「電流饋入推挽式轉換器之研製」，國立成功大學碩士論文，中華民國九十五年。
[14] B. C. Hyun, W. S. Kim, J. H. Lee, and Bo. H. Cho, “A Current driven Half-Bridge ZCS with asymmterical PWM operation,” in Proc. IEEE PESC'06, 2006, pp. 1-5.
[15] R. Y. Chen, R. L. Lin, T. J. Liang, J. F. Chen, and K. C. Tseng, “Current-fed full-bridge boost converter with zero current switching for high voltage applications,” in Proc. IEEE IAS’05, 2005, pp. 2000-2006.
[16] C. Iannello, S. Luo, and I. Batarseh, “Full bridge ZCS PWM converter for high-voltage high-power applications,” IEEE Trans. on Aerospace and Electronic Systems, Vol. 38, no. 2, pp. 515-525, Apr. 2002.
[17] C. Iannello, S. Luo, and I. Batarseh, “A full bridge ZCS PWM converter for high voltage and high power applications,” in Proc. IEEE PESC'00, 2000, pp. 1064-1071.
[18] X. Zhu, D. Xu, G. Shen, D. Xi, K. Mino, and H. Umida, “Current-fed DC/DC converter with reverse block IGBT for fuel cell distributing power system,” in Proc. IEEE IAS’05, 2005, pp. 2043-2048.
[19] H. Hino, T. Hatakeyama, and M. Nakaoka, “Resonant PWM inverter linked DC-DC convertor using parasitic impedances of high-voltage transformer and its applications to X-ray generator,” in Proc. IEEE PESC'88, 1998, pp. 1212-1219.
[20] 楊文賢，「500V 250W 全橋相移式升壓型軟性切換DC-DC轉換器之設計及實作」，中原大學碩士論文，中華民國九十三年。
[21] H. Y. Lu, J. G. Zhu, V. S. Ramsden, and S. Y. R. Hui, “Measurement and modeling of stray capacitances in high frequency transformers,” in Proc. IEEE PESC'99, 1999, pp. 763-768.
[22] D. Wu, TMS320LF2407A DSP模擬板-VP2407AEVM, Value Provider, Inc., Nov. 27, 2003.
[23] TMS320LF/LC240Xa DSP Controllers Reference Guide, Texas Instruments, Inc., Dec. 2001.
[24] 李隆財、吳金勇，「TMS320C240原理與實習」，匯高出版社。
[25] 王信雄，「切換式電源的磁性元件：原理、設計與應用」，國立清華大學先進電源科技中心訓練課程，中華民國九十三年。