Open Access Open Access  Restricted Access Subscription or Fee Access

Interleaved Flyback Converter with a Lossless Snubber

Se-Jin Kim(1), Hyun-Lark Do(2*)

(1) Seoul National University of Science and Technology, Korea, Republic of
(2) Seoul National University of Science and Technology, Korea, Republic of
(*) Corresponding author



In this paper, an interleaved flyback converter with a lossless snubber is presented. By freewheeling the energy stored in a snubber, the overall efficiency is improved. In addition, the proposed converter has small output current ripple due to its interleaving structure. Since the proposed converter operates in discontinuous-conduction mode (DCM), the output diodes turned off under zero-current-switching (ZCS) condition and their reverse-recovery problems are alleviated. In order to reduce the current ripple, interleaving operation scheme is adopted. The operational principle and a steady-state analysis of the proposed converter are provided in detail. In order to verify the theoretical analysis, experimental results based on a 90W prototype at a constant switching frequency of 100 kHz are presented.
Copyright © 2014 Praise Worthy Prize - All rights reserved.


Interleaved Converter; DC/DC Converter; Flyback Converter; Lossless Snubber

Full Text:



Y. K. Lo and J. Y. Lin, “Active-Clamping ZVS Flyback Converter Employing Two Transformers,” IEEE Trans. Power Electron., vol.22, no.6, pp.2416-2423, Nov.2007.

D. Wang, X. He, and J. Shi, “Design and Analysis of an Interleaved Flyback-Forward Boost Converter With the Current Autobalance Characteristic,” IEEE Trans. Power Electron., vol. 25, no. 2, pp. 489-498, Feb. 2010.

A. Abramovitz, T. Cheng, and K. Smedley, “Analysis and Design of Forward Converter With Energy Regenerative Snubber,” IEEE Trans. Power Electron., vol. 25, no. 3, pp. 667-676, Mar. 2010.

C. S. Liao and K. M. Smedley, “Design of High Efficiency Flyback Converter with Energy Regenerative Snubber,” in Proc. IEEE Appl. Power Electron. Conf., Austin, Texas, USA, Feb. 24-28, 2008, pp. 796-800.

R. T. H. Li, H. S. H. Chung, and A. K. T. Sung, “Passive Lossless Snubber for Boost PFC With Minimum Voltage and Current Stress,” IEEE Trans. Power Electron., vol. 25, no. 3, pp. 602-613, Mar. 2010.

R. T. H. Li, and H. S. Chung, “A Passive Lossless Snubber Cell With Minimum Stress and Wide Soft-Switching Range,” IEEE Trans. Power. Electron., vol. 25, no. 7, pp. 1725-1738, Jul. 2010.

Lin, B.-R., Cheng, P.-J., Interleaved bridgeless AC/DC converter with high power factor, (2012) International Review of Electrical Engineering (IREE), 7 (5), pp. 5257-5264.

Taheri, M., Milimonfared, J., Daryabak, M., Analysis, design and implementation of a new ZVS interleaved asymmetrical half-bridge converter using synchronous rectifier, (2010) International Review of Electrical Engineering (IREE), 5 (4), pp. 1381-1389.

Lin, B.R., Huang, S.C., High power factor interleaved buck AC/DC converter with boundary conduction mode, (2011) International Review of Electrical Engineering (IREE), 6 (5), pp. 2079-2087.

T. Qian and B. Lehman, “Coupled Input-Series and Output-Parallel Dual Interleaved Flyback Converter for High Input Voltage Application,” IEEE Trans. Power Electron., vol. 23, no.1, pp.88-95, Jan. 2008.

T. Jin, K. Zhang, K. Zhang, and K. Smedley, “A New Interleaved Series Input Parallel Output (ISIPO) Forward Converter With Inherent Demagnetizing Features,” IEEE Trans. Power Electron., vol.23, no.2, pp.888-895, Mar. 2008.


  • There are currently no refbacks.

Please send any question about this web site to
Copyright © 2005-2022 Praise Worthy Prize