Active Clamp Zero Voltage Switching Multiple Output Flyback Converter with Voltage Doubler

(*) Corresponding author

Authors' affiliations

DOI's assignment:
the author of the article can submit here a request for assignment of a DOI number to this resource!
Cost of the service: euros 10,00 (for a DOI)


This paper proposes a multi output zero voltage switching flyback converter topology with actively clamped switch and voltage doubler circuit. Flyback is the most popular topology for isolated power supply. It can provide multiple isolated outputs with a single switch and has lesser number of component counts. But it suffers from major drawback of high switch current stress high eddy current loss in the air-gap area, a large transformer core, and potential EMI problems. Now a day the latter is overcome by soft switching commutation techniques zero voltage switching (ZVS) or zero current switching (ZCS).But the device still suffers from excessive voltage stress. To triumph over these shortcomings an active clamp flyback converter is proposed. Here the  active clamped switch introduced is turned on at zero voltage, this action discharges energy from active clamp capacitor to transformer leakage inductance that is then used to discharge capacitor across the switch thus bringing down voltage across the switch to zero before turn on. The capacitor also acts as clamp that avoids excessive voltage ringing across the switches. The proposed converter has a voltage doubler rectifier in the secondary. So no dissipative RC snubber across the diode is needed and thus high efficiency, low noise output voltage can be realized. The operating principle and analysis of proposed converter are discussed in this paper in detail. The closed loop simulation with fuzzy logic controller is also presented and the analysis of the converter in terms of efficiency and regulation are analysed in detailed.
Copyright © 2013 Praise Worthy Prize - All rights reserved.


Active Clamp Flyback Converter; Voltage Doubler Rectifier; Zero Voltage Switching (ZVS)

Full Text:



Koji Yoshida, Takuya Ishil and Nobuyoshi Nagagata, “Zero Voltage Switching approach for flyback converter,” Telecommunications Energy Conference , pp.324-329, 1992.ù

Robert Watson, Guichao C Hua and Fred C Lee, “Characterization of active clamp flyback topology for power factor correction applications,” IEEE Trans. on Power Electron, Vol. 11(Issue 1) pp.191-198, January 1996.

Robert Watson, Fred.C.Lee and Guichao.C.Hua, “Utilization of an Active - clamp circuit to achieve soft switching in flyback converters”, PESC, vol.2, pp.909–916, June 1996.

Lee. Y.S and Lin. B.T, “Adding active clamping and soft switch- ing to boost flyback single-stage isolated power factor corrected power supplies”, IEEE Transactions on Power Electron ,vol.12 (Issue 6), pp.1017–1027, November 1997.

Hakoda.Y , Ninomiya.T, Shoyama.M, and Hashimoto.T, “Effect of clamp capacitor on the stability of active-clamp dc-dc converters,” Proc. IEEE Power Electronics Specialists Conf., Vol 1, pp.355–361, May 1998.

Bo-Tao Lin, Kam-Wah Siu, and Yim-Shu Lee, “Actively Clamped Zero Current-Switching Quasi-Resonant Converters using IGBT’s,” Proc. IEEE Trans. on Industrial Electronics,Vol. 46(Issue 1), pp.75–81, February 1999.

Lic.K, Choi.C.T and Kok.S.K, “Modelling of an active clamp discontinuous conduction mode flyback converter under variation of operating conditions,”Proceedings on IEEE Power Electronics and Drive Systems Conferences, vol.2, pp.730–733,1999.

Claudio Manoel C. Duarte and Ivo Barbi, “ An Improved Family of ZVS-PWM Active-Clamping DC-to-DC Converters,” IEEE Transactions On Power Electronics, Vol. 17(Issue 1), pp.1-7 , January 2002.

Alou.P, Garcia .O, Cobos J. A, Uceda .J, and Rascon. M, “Flyback with active clamp: a suitable topology for low power and very wide input voltage range applications,” Proc. IEEE Applied Power Electronics Conf., Vol. 1, pp.242–248, 2002.

Bor- Ren Lin, Huann- Keng, Chiang Kao-Cheng Chen, and David Wang, “Analysis, design and implementation of an active clamp flyback converter,” Power Electronics and Drives Systems, International Conference, PEDS, vol.1, pp.424 – 429, 2005.

Arulselvi .S,Deepa .K ,Uma. G, “Design,Analysis and control of a new multi –output flyback CF-ZVS-QRC”, Proceedigs of the IEEE International Conference on Industrial Technology, pp:413-418,2005.

B.R.Lin, C.E.Huang. K.Huang and D.Wang, “Design and implementation of zero-voltage switching flyback converter with synchronous rectifier,” IEEE Proceedings on Electrical Power Application, vol.153(Issue 3), pp.420-428, May 2006.

Woo Jin Lee, Chong Eun Kim, Gun Woo Moon and Sang Kyoo Han, “A new phase-shifted full-bridge converter with voltage

doubler type rectifier for high-efficiency PDP sustaining power module,” IEEE transactions on industrial electronics, vol.55

(Issue 6), pp.2450-2458, June 2008

Ki-Bum Park, Chong-Eun Kim, Gun-Woo Moon, and Myung-Joong Youn, “PWM Resonant Single-Switch Isolated Converter,” IEEE Transactions on power electronics, Vol. 24, (Issue 8), pp.1876-1886, August 2009.

Huang, C.-L., Lin, B.-R., Design and implementation of Active-Clamping flyback converter for PV-based LED lighting, (2009) International Review of Electrical Engineering (IREE), 4 (5), pp. 691-698.

Rahnamaee, A., Milimonfared, J., Malekian, K., Improvement in reliability and performance of a flyback power supply by implementing zero-voltage-switching, (2009) International Review of Electrical Engineering (IREE), 4 (5), pp. 699-705.

Brian King and David Strasser, “Incorporating Active-Clamp Technology to Maximize Efficiency in Flyback and Forward Designs,” Texas Instruments, SLUP 262, 2010.pp.1-23.

Shikha Singh, G. Bhuvaneswari and Bhim Singh, “Two stage dc-dc converter based multiple output switched mode power supplies,” in National Electrical Engineering Conference on Power and Energy Systems for Tomorrow, DTU, 2011.pp.1-5.

Ahmad Mousavi, Pritam Das and Gerry Moschopoulos, “A Comparative Study of a New ZCS DC–DC Full-Bridge Boost Converter with a ZVS Active-Clamp Converter,” IEEE Transcations on Power Electronics, vol. 27(Issue 3), pp.1347-1358, March 2012.

T.Deepti, Deepa.k, “Design and implemention of low drop out post regulator for multi output converter,” M.Tech Thesis, Amrita Viswa Vidhyapeetham, Bangalore, India, 2012.

Shikha Singh ,G. Bhuvaneswari and Bhim Singh, “Improved Power Quality Based Bridgeless Multiple Outputs Power Supply,” International Conference on Computer Communication and Informatics (ICCCI -2013),pp. 1-5, Jan 2013

Ned Mohan, “Power electronics, Converters Applications and Design,” Wiley Publications, 1995, Second Edition.

Abraham I. Pressman, “Switching Power Supply Design,” McGraw-Hill Publications, 1998, Second Edition.

L.Umanand, “Power electronics essentials and applications,” Wiley Publications, 2009, First Edition.


  • There are currently no refbacks.

Please send any question about this web site to
Copyright © 2005-2024 Praise Worthy Prize