本文提出具有低輸入電流漣波之返馳式電路(FYRR)。籍由箝位電容以及變壓器的漏感可以達成輸入電流漣波的降低。而應用崁入式的帶拒濾波器可以再更進一步的降低諧波成分。因此，脈波式輸入電流所造成的電磁干擾可以被降低。本文提出另一個雙開關低輸入電流漣波之返馳式電路(2SFYRR)，此電路應用高電壓開關單元提升轉換器的效率。除了電路工作原理之介紹，並以輸入範圍40-60V和5V/20A輸出，開關的切換頻率為150 kHz的電路規格進行實驗。

Flyback converter with current ripple reduction (FYRR) is proposed and investigated in this thesis. The input current ripple reduction is achieved by utilizing the clamp capacitor and the leakage inductances of the transformer. Therefore, the EMI noise caused by the pulsating input current waveform can be reduced.
Moreover, the EMI noise level can be further reduced by utilizing the clamp capacitor and the leakage inductance of the transformer as an embedded notch filter.
To further improve the efficiency of the FYRR by utilizing a high-voltage switch cell, two-switch flyback converter with current ripple reduction (2SFYRR) is also proposed and investigated in this thesis.
To demonstrate their feasibility, the operation principles as well as the experimental results with 150 kHz, 40-60V input and 5V/20A output are described in this thesis.

[1] Patel, H.K, “Voltage transient spikes suppression in flyback converter using dissipative voltage snubbers,” Industrial Electronics and Applications, IEEE ICIEA '08, June 2008, pp. 897 – 901
[2] A. Hren, H. Korelic, M. Milanovic, ‘‘RC-RCD clamp circuit for ringing losses reduction in a flyback converter,’’ IEEE Transactions on Circuits and Systems II: Express Briefs, Vol. 53, Issue 5, pp. 369-373, May 2006.
[3] Maxim Integrated Products. (2001, November 12). Snubber Circuits Suppress Voltage Transient Spikes in Multiple Output DC-DC Flyback Converter Power Supplies (Application note 848) [Online].
Available: http://www.maxim-ic.com/appnotes.cfm/appnote_number/848
[4] K. Yoshida, T. Ishii, and N. Nagagata, ‘‘Zero voltage switching approach for flyback converter,’’ Telecommunications Energy Conference, INTELEC '92, October 1992, pp. 324-329.
[5] R. Watson, F. C. Lee, and G. C. Hua, “Utilization of an active-clamp circuit to achieve soft switching in flyback converters,” IEEE Transactions on Power Electronic, vol. 11, no. 1, pp. 162-169, January 1996.
[6] B. R. Lin, H. K. Chiang, K. C. Chen and D. Wang, “Analysis, Design and Implementation of An Active Clamp Flyback Converter,” Power Electronics and Drives Systems, IEEE PEDS '05, Vol. 1, 2005, pp. 424-429.
[7] G. Spiazzi, L. Rossetto, and P. Mattavelli, ‘‘Design optimization of soft-switched insulated DC/DC converters with active voltage clamp,’’ Industry Applications Conference, IEEE IAS '96, October 1996, pp. 1169-1176.
[8] D. Dalal, “Design considerations for active clamp and reset technique,” Unitrode Power Supply Design Seminar, SEM-1200, pp. A4-1-A4-23.
[9] 鄭玉南，「返馳式轉換器緩振電路研究」，碩士論文，國立台灣科技大學，台北 (2004)。
[10] Ching-Shan Leu, Improved forward topologies for DC-DC applications with built-in input filter, Ph.D. dissertation, Department of Electrical Engineering, Blacksburg, Virginia, January 24, 2006.
[11] Ching-Shan Leu and Wei-Lun Chen, “A novel two-switch forward configuration for wide input-voltage range applications RCD-clamped forward converter with ripple reduction (RCDFRR),” Electronics Specialists Conference, IEEE PESC '08, June 2008, pp. 2278 - 2283.
[12] Ching-Shan Leu and Junn-Bin Hwang, “A built-in-input filter forward converter,” Power Electronics Specialists Conference, IEEE PESC '94, vol.2, June 1994, pp. 917-921.
[13] Ching-Shan Leu, and Junn-Bin Hwang, “Built-in input filter forward converter,” U.S. Patent, 5523936 (1996).
[14] 黃信諭，「具有同步整流之低輸入電流漣波雙開關RCD箝位型順向式轉換器」，碩士論文，國立台灣科技大學，台北 (2008)。
[15] 劉政佳，「低輸入電流漣波之主動箝位型順向式轉換器」，碩士論文，國立台灣科技大學，台北 (2009)。
[16] SIMetrix Technologies Ltd. (2009, April 2). SIMPLIS reference manual (Version 5.6) [Online].
Available: http://www.simetrix.co.uk/Files/manuals/5.6/SIMPLIS_Reference.pdf
[17] SIMetrix Technologies Ltd. (2009, April 2). Users manual (Version 5.6) [Online].
Available: http://www.simetrix.co.uk/Files/manuals/5.6/UsersManual.pdf
[18] Ching-Shan Leu ,and Ting-Yu Chou,” Two-Switch Forward Topologies with Various Reset Schemes”, The First International Conference on Advanced Motor Drive, Power Electronics, and Emerging Technology, 2008, A2-3-1.
[19] Ching-Shan Leu, “Low Voltage Stress Power Converter,” U.S. Patent, 7515439 (2009).
[20] 周庭宇，「雙開關順向式轉換器去磁機制之研製」，碩士論文，國立台灣科技大學，台北 (2009)。
[21] Cooper, D.L., “Standardization of specifications for distributed power converter modules,” Applied Power Electronics Conference and Exposition, IEEE APEC Conf. Rec., Vol. 2, March 1996, pp. 997 - 1003.
[22] N. Mohan, T. M. Undeland, and W. P. Robbins, Power Electronics: Converters, Applications, and Design, 3rd Ed, John Wiley & Sons, Inc, 2003.
[23] Abraham I. Pressman, Switching Power Supply Design, 2/e, The McGraw-Hill Companies, Inc. International Editions 1999.
[24] R.W. Erickson, D. Maksimovic, Fundamentals of Power Electronics, 2nd Ed, Kluwer Academic Publishers, 2001.
[25] Christophe P. Basso, Switch-Mode Power Supplies, McGraw-Hill Companies, 2008.
[26] Colonel WM. T. McLyman, Transformer and Inductor Design Handbook, 3rd ed. Idyllwild, California, USA: Kg Magnetics Inc., 2004.
[27] 梁適安，交換式電源供給器之理論與實務設計，全華科技圖書股份有限公司，2006。
[28] EPARC，電力電子學綜論，全華科技圖書股份有限公司， 2007。