Browse > Article
http://dx.doi.org/10.6113/TKPE.2017.22.2.140

A Study on the Soft-Switching Forward-Flyback Converter Using Auxiliary Inductor and Auxiliary Diode  

Lee, A-Ra (School of Electrical Eng., Kookmin University)
Park, Jun-Woo (School of Electrical Eng., Kookmin University)
Hong, Sung-Soo (KPEC, School of Electrical Eng., Kookmin University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.22, no.2, 2017 , pp. 140-149 More about this Journal
Abstract
This study proposes a new type of active-clamp forward-flyback converter with two transformers that operate in forward and flyback modes during on and off times, respectively, instead of not using an output inductor. The main switch can be turned on with zero-voltage switching (ZVS) using the leakage inductance of the transformer and the output capacitor of the main switch. The leakage inductance should be increased to ZVS. However, the ringing between the leakage inductance of the transformer and the parasitic output capacitance of the secondary side rectifier switches results in a serious voltage spike. A forward-flyback converter employing auxiliary inductor and auxiliary diode is proposed to overcome the problem. The operational principles are analyzed in detail and validated through experiments with a 385 V-to-53 V/37 A prototype.
Keywords
Forward-flyback converter; High efficiency; Soft switching; Two transformer; ZVS;
Citations & Related Records
연도 인용수 순위
  • Reference
1 R. J. Wai, C. Y. Lin, R. Y. Duan, and Y. R. Chang, "High-efficiency DC-DC converter with high voltage gain and reduced switch stress," IEEE Transactions on Industrial Electronics, Vol. 54, No. 1, pp. 354-364, Feb. 2007.   DOI
2 G. Hua, C. S. Leu, and F. C. Lee, "Novel zero-voltage transition PWM converters," IEEE Transactions on Power Electronics, Vol. 9, No. 2, pp. 213-219, Mar. 1994.   DOI
3 T, Zhang, P. C. Sen, and Y. F. Liu, "A novel zero voltage switched(ZVS) buck converter using coupled inductor," Proc. Canadian Conf. Electrical and Computer Engineering, Vol. 1, pp. 357-362, May 2011.
4 H. L. Do, "Zero-voltage-switching synchronous buck converter with a coupled inductor," IEEE Transactions on Industrial Electronics, Vol. 58, No. 8, pp. 3440-3447, Aug. 2011.   DOI
5 J. A. Sabate, V. Vlatkovic, R. B. Ridely, F. C. Lee, and B. H. Cho, "Design considerations for high-voltage high power full-bridge zero-voltage-switched PWM converter," Proc. IEEE APEC'90(IEEE Catalog No. CH2853-0/90/0000-0265), pp. 275-284, 1990.
6 P. K. Jain, W. Kang, H. Soin, and Y. Xi, "Analysis and design considerations of a load and line independent zero voltage switching full bridge DC/DC converter topology," IEEE Transactions on Power Electronics, Vol. 17, No. 5, pp. 649-657, Sep. 2002.
7 L. H. Mweene, C. A. Wright, and M. F. Schlecht, "A 1kW 500kHz front-end converter for a distrbuted power supply system," IEEE Transactions on Power Electronics, Vol. 6, No. 3, pp. 398-407, Jul. 1991.   DOI
8 I. Cohe, D. Hills, and N. Y, "Pulse width modulated DC/DC converter with reduced ripple current stress and zero voltage switching capability," U.S Patent 5291382 A.
9 Y. H. Kang, B. C. Choi, and W. S. Lim, "Analysis and design of a forward-flyback converter employing two transformers," PESC (Power Electronics Specialists Converence), Vol. 1, pp. 357-362, Jun. 2001.
10 Y. Xi, P. K. Jain, G. Joos, and H. Jin, "A zero voltage switching forward converter topology," Proc. Telecommunications Energy Conf., pp. 116-123, Oct. 1997.
11 Y. K. Lo and J. Y. Lin, "Active-clamping ZVS flyback converter employing two transformers," IEEE Transactions on Power Electronics, Vol. 22, No. 6, pp. 2416-2423, Nov. 2007.   DOI
12 Y. Y. Wen, H. Mao, and I. Batarseh, "DC bias analysis and small signal forward-flyback dc-dc converter with a current doubler rectifier," APEC 2005, Vol. 3, pp. 1531-1536, 2005.
13 B. R. Lin, H. K. Chiang, and C. C. Chen, "Analysis of a zero-voltage switching converter with two transformers," IEEE Transactions on Circuits and Systems II, Vol. 53, No. 10, pp. 1088-1092, Oct. 2006.   DOI
14 H. K. Yoon, E. S. Choi, S. K. Han, G. W. Moon, and M. J. Youn, " Zero-voltage and zero-current switching two transformer full-bridge converter using the output voltage doubler," IPEMC (Power Electronics andd Motion Control Conference) , Vol. 2, pp. 1-5, Aug. 2006.
15 H. K. Yoon, S. K. Han, J. S. Park, G. W. Moon, and M. J. Youn, "Zero-voltage switching two-transformer full-bridge PWM converter with lossless diode-clamp rectifier for PDP sustain power module," IEEE Transactions on Power Electronics, Vol. 21, No. 5, pp. 1243-1252, Sep. 2006.   DOI
16 J. A. Cobos, "RCD clamp PWM forward converter with self driven synchronous rectification," IECON (Industrial Electronics, Control, and Instrumentation), Vol. 2, pp. 1336-1341, Nov. 1993.
17 Hren, Alenka, J. Korelic, and M. Milanovic, "RC-RCD clamp circuit for ringing losses reduction in a flyback converter," IEEE Transactions on Circuits and Systems II, Vol. 53, No. 5, pp. 369-373, May 2006.   DOI