A New Family of Soft Single Switched DC-DC Converters with Lossless Passive Snubber

  • Shabnam Nasr Esfahani Department of Electrical Engineering, Arak Branch, Islamic Azad University, Arak, Iran
  • Majid Delshad of Electrical Engineering, Isfahan(Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
  • Mohhamad Bagher Tavakoli Department of Electrical Engineering, Arak Branch, Islamic Azad University, Arak, Iran
Keywords: Lossless Passive Snapper, Zero Current Switching Condition (ZCS), Zero Voltage Switching Condition (ZVS), Electromagnetic Interference (EMI)


In this paper, a novel lossless snubber is introduced that provides ZVS conditions for both On and Off instant of converter switches. On one hand, the energy of the snubber is optimally transmitted to the output so that no significant losses are imposed on the converter. Since the converter diodes are switched off as ZCS, the reverse recovery problem is reduced. In this paper, the proposed snubber circuit is applied to a conventional boost converter and an 80W sample is constructed in the laboratory to prove the performance and theoretical analysis. Furthermore, in order to confirm the effectiveness of the proposed snubber on the reduction of Electromagnetic Interference (EMI), the EMI value of the boost converter with the proposed snubber has been compared with the conventional boost converter, which shows a decrease of 10dBμV.


[1] T.Mishima, M.Nakaoka,"A New Family of Soft Switching PWM Non-isolated DC-DC Converters with Active auxiliary Edge-Resonant Cell", IEEE Conferences, Power Electronics Conference (IPEC), pp. 2804 – 2809, 2010.
[2] A.K.Panda, S.Pattnaik and K. K. Mohapatra, "A Novel Soft-Switching Synchronous Buck Converter for Portable Applications", International Journal of Power Management Electronics, Article ID 862510, 2007.
[3] S. -Y. Tseng, Y. –J. Li and, Y. –J. Wu, "Buck Converter Associated with Active Clamp Flyback Converter for PV Power System", Green Power Evolution Applied Research Lab (G-PEARL), ICSET 2008.
[4] E.Adib and H. Farzanehfard, "New Zero Current Transition PWM Converters", in Proc. IEEE ICIT Conf., pp. 2131–2136, 2006.
[5] D.W. Hart, " Power Electronics", McGraw-Hill Companies Inc, New York, 4th edn ,2010.
[6] C.-J. Tseng and C.-L. Chen, "A Passive Lossless Snubber Cell for Nonisolated PWM DC/DC Converters", IEEE Transactions on Industrial Electronics, Vol.45 No.4, pp. 593-601, 1998.
[7] M.KHalilian,E.Adib andH.Farzanehfard,"Familiy of Single-switch Soft-switching Pulse-width Modulation DC-DC Converters with Reduced Switch Stress" , IET Power Electronics,Vol. 7, Iss. 8, pp. 2182–2189, 2014.
[8] M.Mohammadi, E.Adib and H.Farzanehfard," Passive Lossless Snubber for Double-Ended Flyback Converter", IET Power Electronics, Vol. 8, pp. 56 – 62, 2014.
[9] M.Mohammadi, E. Adib,"Reducing Turn Off Losses with a Passive Lossless Snubber for Boost Converter", Proc. 5th PEDSTC, Tehran, Iran, pp. 385–389, 2014.
[10] M.Mohammadi, E.Adib and M. R. Yazdani, "Family of Soft-Switching Single- Switch PWM Converters with Lossless Passive Snubber", IEEE Transactions on Industrial Electronics, Vol. 62, No. 6, pp. 3473-3481, 2015.
[11] N.Mohammadian, M.R.Yazdani," Half-bridge Flyback Converter with Lossless Passive Snubber and Interleaved Technique", IET Power Electronics, Vol. 11, pp.239-245, 2017.
[12] J.W.Kim, J.M.Choe and J.Sh.Jason Lai, "Nonisolated Single-Switch Two-Channel LED Driver with Simple Lossless Snubber and Low-Voltage Stress", IEEE Transactions on Power Electronics, Vol. 33, pp. 4306 – 4316, 2017.
[13] K.Soltanzadeh, M.R.Yousefi,"Analysis and Design of Two-switch Flyback Converter with Double Passive Lossless Snubber", IET Power Electronics(IET Journals & Magazines), Vol. 11, pp.1187 – 1194, 2018.
[14] S.W.Lee, H.L.Do," High Step-Up Coupled-Inductor Cascade Boost DC–DC Converter With Lossless Passive Snubber", IEEE Transactions on Industrial Electronics(IEEE Journals & Magazines), Vol. 65, pp.7753 – 7761, 2018.
[15] E.Gerami, M.Delshad, M.R.Amini and M.R.Yazdani," A New Family of Non-isolated PWM DC–DC Converter with Soft Switching ", IET Power Electronics(IET Journals & Magazines), Vol. 12, pp. 237 – 244, 2018.
[16] T. M. U. W. P. R. Ned Mohan, "Power Electronics: Converters, Applications, and Design", Michigan: John Wiley & Sons, 2003.
[17] C.R. Paul, "Introduction to Electromagnetic Compatibility", publisher: J.Wiley and Sons, 2th Edition, 2006.
[18] S. Wang, "Characterization and Cancellation of High-Frequency Parasitic for EMI Filters and Noise Separators in Power Electronics Applications", Ph.D Thesis, Virginia Tech, May 2005.
How to Cite
Nasr Esfahani, S., Delshad, M., & Tavakoli, M. (2020). A New Family of Soft Single Switched DC-DC Converters with Lossless Passive Snubber. Majlesi Journal of Electrical Engineering, 14(2), 51-59. Retrieved from http://mjee.iaumajlesi.ac.ir/index/index.php/ee/article/view/3587