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A Unified Model for the ZVS DC-DC Converters with Active Clamp

Lakshminarasamma, N and Swaminathan, B and Ramanarayanan, V (2004) A Unified Model for the ZVS DC-DC Converters with Active Clamp. In: 2004 IEEE 35th Annual Power Electronics Specialists Conference. PESC 04, 20-25 June, Aachen,Germany, Vol.3, 2441 -2447.


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Active clamp DC-DC converters are recently introduced family of two switch pulse width modulated converters featuring zero-voltage switching. The topological structure of these converters in relation to their hard-switched PWM converters is highlighted. With proper designation of the circuit variables (throw voltage V and the pole current I), all these converters are seen to be governed by an identical set of equations. In this framework, these circuits exhibit 6 sub-periods per cycle with identical current waveform in the resonant inductor. With idealized switches, the steady-state performance is obtainable in an analytical form. This set of equations may be solved through a simple spreadsheet programme. The steady-state performance provides a design constraint on the normalized current. The conversion ratio of the converter is also readily available. A generalized equivalent circuit emerges for all these converters from this steady-state conversion ratio. It is interesting to note that this equivalent circuit provides a dynamic model as well. The circuit model proposed in this paper enables one to use the familiar state space averaged results of the standard PWM DC-to-DC converters (both steady-state and dynamic) for their ZVS active clamp counterparts.

Item Type: Conference Paper
Publisher: IEEE
Additional Information: ©1990 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 13 Dec 2005
Last Modified: 19 Sep 2010 04:22
URI: http://eprints.iisc.ac.in/id/eprint/4436

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