Soft Switched Flyback Converter Using Active Lossless Snubber

Document Type : Research Article

Authors

1 Isfahan University Of Technology

2 Isfahan University of Technology

3 University of Alberta, Canada

Abstract

In this paper, a new active lossless snubber circuit is proposed, which provides a soft-switching condition for the traditional Pulse Width Modulation (PWM) fly-back converter. This active lossless snubber circuit creates Zero Voltage Switching (ZVS) condition for the main switch, while Zero Current Switching (ZCS) condition is achieved for the auxiliary switch. Moreover, based on the soft-switching condition, diode reverse recovery problem is omitted and leads to reduction of switching losses and increased efficiency. Additionally, the voltage stress of the auxiliary switch is clamped to the input voltage level which leads to its low capacitive turn ON loss. Furthermore, the presented active lossless snubber circuit provides soft-switching condition independent from load condition. The main and auxiliary switches do not need an isolated gate driver, since their source pins are connected to the input ground. In this manuscript, the different operating modes are explained in detail, and a comprehensive design procedure is presented. Furthermore, loss breakdown for converter elements is offered at full load. The simulation results of the proposed converter using PSPICE software are shown for 155V input, 24 V, 120 W output, and 100 kHz switching frequency to justify the theoretical analysis. The proposed converter has high efficiency of 94.08% at full load.

Keywords

Main Subjects


[1] M. J. Esfandani, M. Feizi, R. Beiranvand, CCM operation of a single stage boost-flyback converter with active-clamp for led driver applications, in: 2020 11th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC), IEEE, (2020), 1-6.
[2] C. Wang, C. Su, C. Yang, ZVS-PWM flyback converter with a simple auxiliary circuit, IEE Proceedings-Electric Power Applications, 153(1) (2006) 116-122.
[3] M. R. Yazdani, S. Rahmani, A new zero-current-transition two-switch flyback converter, in: 2014 5th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC), IEEE, (2014), 390-395.
[4] E. Adib, H. Farzanehfard, New zero voltage switching PWM flyback converter, in: 2010 5th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC), IEEE, (2010), 196-200.
[5] B. Aklaghi, H. Farzanehfard, Family of ZVT interleaved converters with low number of components, IEEE Transactions on Industrial Electronics, 65(11) (2018) 8565-8573.
[6] S. Khalili, N. Molavi, H. Farzanehfard, Soft-switched asymmetric interleaved WCCI high step-down converter with low voltage stress, IEEE Journal of Emerging and Selected Topics in Power Electronics, (2021).
[7] C. Wang, A novel ZCS-PWM flyback converter with a simple ZCS-PWM commutation cell, IEEE Transactions on Industrial Electronics, 55(2) (2008) 749-757.
 [8] S. Khalili, H. Farzanehfard, M. Esteki, High step-down DC-DC converter with low voltage stress and wide soft-switching range, IET Power Electronics, 13(14) (2020) 3001-3008.
[9] R. R. Khorasani, E. Adib, H. Farzanehfard, ZVT resonant core reset forward converter with a simple auxiliary circuit, IEEE Transactions on Industrial Electronics, 65(1) (2018) 242-250.
[10] C. Vartak, A. Abramovitz, K. Smedley, Analysis and design of energy regenerative snubber for transformer isolated converters, IEEE Transactions on Power Electronics, 29(11) (2014) 6030-6040.
[11] M. Mohamadi, M. Ordonez, Flyback lossless passive snubber, in 2015 IEEE Energy Conversion Congress and Exposition (ECCE), (2015) 5896-5901.
[12] K. Davoodi, J. Shokr elahi Moghani, S. Salehi Dobakhshari, A high efficient compact 4th order CLCL converter features to use constant current power supply, AUT journal of Electrical Engineering, 51(1) (2019) 63-70.
[13] R. T. H. Li, H. S. Chung, A passive lossless snubber cell with minimum stress and wide soft-switching range, IEEE Transactions on Power Electronics, 25(7) (2010) 1725-1738.
[14] K. Soltanzadeh, M. R. Yousefi, Analysis and design of two-switch flyback converter with double passive lossless snubber, IET Power Electronics, 11(7) (2018) 1187-1194.
[15] Y. Xi, P. Jain, G. Joos, Y. F. Liu, An improved zero voltage switching flyback converter topology, in: PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No. 98CH36196), IEEE, (1998) 923-929.
[16] E. Adib, H. Farzanehfard, Family of zero current zero voltage transition PWM converters, IET Power Electronics, 1(2) (2008) 214-223.
[17] CH. M. Wang, J. H. Su, CH. H. Yang, A novel ZCS-PWM flyback converter with a simple ZCS-PWM auxiliary circuit, in: 2005 International Conference on Power Electronics and Drives Systems, (2005) 805-810.
[18] J. G. Kassakian, M. F. Schlecht, G. C. Verghese, Principles of Power Electronics, (2000).