Title: A modified non-dissipative LC snubber circuit for MOSFET based fly-back converters

Authors: Debashis Chatterjee, A.K. Ganguli, R. Chakrabarti, S.S. Bharatkar

Addresses: Electrical Engineering Department, Jadavapur University, Kolkata-700032, India. ' Electrical Engineering Department, Jadavapur University, Kolkata-700032, India. ' Electrical Engineering Department, Jadavapur University, Kolkata-700032, India. ' Electrical Engineering Department, Govt. Polytechnic, Yavatmal, Maharashtra State, India

Abstract: High frequency converters with different switching topologies are now being widely used over a wide range of applications, which mainly includes different types of power supplies. Snubber circuit design for high frequency-switched converters using MOSFET as a power device assumes different dimension as regards the minimisation of the power dissipation in the snubber resistance. This paper shows a different mode of operation to reduce the clamp voltage across the device used in fly-back type converter. The LC snubber circuit is almost lossless and of energy regenerative type. A reduced clamp voltage is required not only for device protection, but also to reduce the cross regulation effect in multiple output converters. Simulations and experimental results validate the concept.

Keywords: non-dissipative snubber; fly-back converters; resonant frequency; LC clamp; clamp voltage; simulation; MOSFET; high frequency converters; switching topologies; snubber circuit design.

DOI: 10.1504/IJPELEC.2010.029493

International Journal of Power Electronics, 2010 Vol.2 No.1, pp.1 - 15

Received: 30 Apr 2008
Accepted: 24 Nov 2008

Published online: 30 Nov 2009 *

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