本論文主旨係提出適用於高輸出電壓之電流饋入式零電流切換全橋轉換器小信號分析。傳統全橋轉換器因開關操作於硬切狀態下，造成開關元件切換之損失，導致轉換器整體效率降低。為減低開關元件之切換損失，本文採用結合相移及零電流切換技術之電流饋入式零電流切換全橋轉換器電路，以獲致高升壓轉換率，應用於高壓負載。
為分析零電流切換全橋轉換器之開迴路系統穩定度，據以設計電路之參數諸元。本文所提出之小信號分析係利用脈波寬度調變開關模型以建構小信號等效電路，據此推導電路小信號轉移函數，輔以數學軟體Mathcad繪出轉移函數之波德曲線。
最後，使用PSM1735增益相位分析儀以測量1kV輸出電壓之零電流切換全橋轉換器雛型電路開迴路系統波德圖，俾驗證本論文所推導之轉移函數。

This thesis presents the small-signal analysis of the full-bridge current-fed zero-current-switching (FB-CF-ZCS) for high voltage application. Due to hard-switching condition on the switches, operation of the conventional full-bridge converter involves high switching losses and low efficiency. Therefore, the phase-shifted and ZCS scheme is developed in order to reduce the losses on the switches. Consequently, the converter is suitable for high voltage application.
The modeling for FB-ZCS converter is presented. In order to derive the transfer functions for the prediction of the system characteristics, the corresponding equivalent circuit models can be developed by utilizing the pulse-width-modulation (PWM) switch models. Based on the built equivalent circuit models, the system transfer function will be derived to plot the system Bode diagrams by Mathcad.
Finally, the measurement station has been built by using the gain/phase analyzer, PSM1735, to validate the derived open-loop system transfer functions, in which the circuit specifications are output voltage 1kV.

參考文獻
[1] R. Y. Chen, T. J. Liang, J. F. Chen, R. L. Lin and K. C. Tseng, “Study and implementation of a current-fed full-bridge boost dc–dc converter with zero-current switching for high-voltage applications,” IEEE Trans. Ind. Appl., vol. 44, no. 4, pp. 1218-1226, Jul./Aug., 2008.
[2] J. F. Chen, R. Y. Chen and T. J. Liang, “Study and implementation of a single-stage current-fed boost PFC converter with ZCS for high voltage applications,” IEEE Trans. Power Electron., vol. 23, no. 1, pp. 379-386, Jan. 2008.
[3] H. Hino, T. Hatakeyama and M. Nakaoka, “Resonant PWM inverter linked DC-DC converter using parasitic impedances of high-voltage transformer and its applications to X-ray generator,” IEEE Power Electronics Specialists Conf., April 1988, vol. 2, pp. 1212-1219.
[4] 鄒應嶼，「交換式電源供應器設計」，國立交通大學電機與控制工程研究所訓練課程，民國94年。
[5] J. A. Sabate, V. Vlatkovic, R. B. Ridley, F. C. Lee and B. H. Cho, “Design considerations for high-voltage high-power full-bridge zero-voltage-switched PWM converter,” IEEE Appl. Power Electronics Specialists Conf. and Expo, March 1990, pp. 275-284.
[6] C. Iannello, S. Luo and I. Batarseh, “A full bridge ZCS PWM converter for high voltage and high power applications,” IEEE Power Electronics Specialists Conf., June 2000, vol. 2, pp. 1064-1071.
[7] J. Sun and H. Grotstollen, “Averaged modeling of switching power converters: reformulation and theoretical basis,” IEEE Power Electronics Specialists Conf., June 1992, vol. 2, pp. 1165-1172.
[8] X. Ruan and Y. Yan, “Soft-switching techniques for PWM full bridge converters,” IEEE Power Electronics Specialists Conf., June 2000, vol. 2, pp. 634-639.
[9] S. D. Johnson, A. F. Witulski and R. W. Erickson, “Comparison of resonant topologies in high voltage DC applications,” IEEE Trans. Aeros. and Electron. Sys., vol. 24, no. 3, pp.263-274, May 1988.
[10] S. Jacobson and R. A. Diperna, “Fixed frequency resonant converter for high voltage high density applications,” IEEE Power Electronics Specialists Conf., June 1993, pp. 357-363,.
[11] X. Zhu, D. Xu, H. Mino and K. Umida, “Current-fed phase shift controlled full bridge ZCS DC-DC converter with reverse block IGBT,” IEEE Appl. Power Electronics Specialists Conf. and Expo, March 2005, vol. 3, pp. 1605-1610.
[12] G. C. Hua and F. C. Lee , “Soft-switching techniques in PWM converters,” IECON. Conf. Ind. Electron., Cont. and Instrument., Nov. 1993, vol. 2 , pp. 637-643.
[13] K. H. Liu and F. C. Lee , “Zero-voltage switching technique in DC/DC converters,” IEEE Trans. Power Electron., vol. 5, no. 3 , pp.293-304, July 1990.
[14] M. M. Jovanovic, W. A. Tabisz and F. C. Lee , “Zero-voltage-switching technique in high-frequency off-line converters,” IEEE Appl. Power Electronics Specialists Conf. and Expo, Feb. 1988, vol. 2 , pp. 23-32.
[15] J. Abu-Qahouq and I. Batarseh, “Generalized analysis of soft-switching DC-DC converters,” IEEE Power Electronics Specialists Conf., June 2000, vol. 1, pp. 185-192.
[16] M. Nakaoka, S. Nagai, Y. J. Kim, Y. Ogino and Y. Murakami, “The state-of-the-art phase-shifted ZVS-PWM series and parallel resonant DC-DC power converters using internal parasitic circuit components and new digital control,” IEEE Power Electronics Specialists Conf., June. 1992, vol. 2, pp. 62-70.
[17] V. Garcia, M. Rico, J. Sebastian, M. M. Hernando and J. Uceda, “An optimized DC to DC converter topology for high voltage pulse-load applications,” IEEE Power Electronics Specialists Conf., June 1994, pp. 1413-1421.
[18] Y. J. Kim, M. Nakaoka, H. Takano and T. Hatakeyama, “Comparative performance evaluations of high voltage transformer parasitic parameter resonant inverter-linked high power DC-DC converter with phase-shifted PWM scheme,” IEEE Power Electronics Specialists Conf., June 1995, vol. 1, pp. 120-127.
[19] V. Vorperian, “Simplified analysis of PWM converters using model of PWM switch. part I : continuous conduction mode,” IEEE Trans. Aeros. and Electronic Sys., vol. 26, no. 3, pp. 490-496, May 1990.
[20] K. D. T. Ngo, “Alternate forms of the PWM switch models,” IEEE Trans. Aeros. and Electronic Sys., vol. 35, no 4, pp. 1283-1292, Oct. 1999.
[21] V. Vlatkovic, J. A. Sabate, R. B. Ridley, F. C. Lee and B. H. Cho, “Small-signal analysis of the phase-shifted PWM converter,” IEEE Trans. Power Electron., vol. 7, no. 1, pp.128-135, Jan. 1992.
[22] 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，民國93年。
[23] 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，民國93年。
[24] 梁適安，「交換式電源供給器之理論與實務」，全華科技圖書股份有限公司，中華民國90年。
[25] 林瑞禮，「電力電子特論」,國立成功大學電力電子學課程, 民國97年。