Steady-State Stability of Current-Mode Active-Clamp ZVS DC-DC Converters

Lakshminarasamma, N and Masihuzzaman, Md and Ramanarayanan, V (2011) Steady-State Stability of Current-Mode Active-Clamp ZVS DC-DC Converters. In: IEEE Transactions on Power Electronics, 26 (5). pp. 1295-1304.

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Abstract

Active-clamp dc-dc converters are pulsewidth-modulated converters having two switches featuring zero-voltage switching at frequencies beyond 100 kHz. Generalized equivalent circuits valid for steady-state and dynamic performance have been proposed for the family of active-clamp converters. The active-clamp converter is analyzed for its dynamic behavior under current control in this paper. The steady-state stability analysis is presented. On account of the lossless damping inherent in the active-clamp converters, it appears that the stability region in the current-controlled active-clamp converters get extended for duty ratios, a little greater than 0.5 unlike in conventional hard-switched converters. The conventional graphical approach fails to assess the stability of current-controlled active-clamp converters, due to the coupling between the filter inductor current and resonant inductor current. An analysis that takes into account the presence of the resonant elements is presented to establish the condition for stability. This method correctly predicts the stability of the current-controlled active-clamp converters. A simple expression for the maximum duty cycle for subharmonic-free operation is obtained. The results are verified experimentally.

Item Type:	Journal Article
Publication:	IEEE Transactions on Power Electronics
Publisher:	IEEE
Additional Information:	Copyright 2009 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.
Keywords:	Active-clamp converter;current-programmed control;equivalent circuit model;stability;subharmonic oscillations; zero-voltage switching (ZVS)
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	25 Oct 2011 10:01
Last Modified:	25 Oct 2011 10:01
URI:	http://eprints.iisc.ac.in/id/eprint/41669

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