Faculty Publications

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Publications by NITK Faculty

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Author: search.filters.author.Prabhakaran, P.Subject: search.filters.subject.High gain

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    A Novel Bidirectional Modified Zeta Converter With Wide Voltage Conversion Ratio
    (Institute of Electrical and Electronics Engineers Inc., 2025) Mandal, S.; Prabhakaran, P.
    High-gain, nonisolated bidirectional dc–dc converters (BDCs) play a vital role in interfacing energy storage systems with microgrids and electric vehicles (EVs). However, the existing converters often operate within a limited duty cycle range and involve high component counts and significant voltage stress for achieving desired voltage gain. This article presents a novel noncoupled high-gain BDC that efficiently operates in the boost mode for forward power flow and buck mode for reverse power flow. Based on a modified zeta converter topology, the proposed converter offers a simplified circuit structure and control strategy, requiring fewer components. It achieves wide voltage gain across an extended duty cycle range while minimizing voltage stress on most switches. A 200-W prototype has been developed and tested in the laboratory to validate the converter’s performance. To enhance efficiency, SiC MOSFETs are utilized, achieving a peak efficiency of 96%. Experimental results confirm the converter’s suitability for both open-loop and closed-loop configurations, highlighting its potential for diverse applications in energy storage systems and EVs. © 2013 IEEE All rights reserved.
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    A Transformerless Bidirectional Active Switched Inductor-Based SEPIC High-Gain DC–DC Converter With Buck–Boost Capability
    (Institute of Electrical and Electronics Engineers Inc., 2025) Mandal, S.; Prabhakaran, P.; Dominic, D.A.; Parameswaran, A.P.
    The growing demand for efficient and compact power conversion systems in electric vehicles (EVs), renewable energy systems, DC microgrids, and both portable and stationary medical equipment has intensified research into non-isolated high-gain bidirectional DC-DC converters. Existing solutions often employ transformer-based topologies or coupled inductors, which introduce increased cost, size, and control complexity. This paper presents a novel transformerless bidirectional high-gain DC-DC converter based on a modified Single-Ended Primary Inductor Converter (SEPIC) architecture. The proposed topology incorporates an Active Switched Inductor (ASL) at the input stage to achieve a wide voltage conversion ratio while ensuring reduced voltage stress on the maximum power switches. A key feature of the converter is its ability to provide bidirectional buck–boost operation in both power flow directions, while maintaining a reduced component count and improved efficiency through synchronous rectification. The converter’s performance is thoroughly analyzed under both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). Furthermore, detailed small-signal modeling and closed-loop controller design are developed for both voltage-mode and current-mode control. A 200 W experimental prototype employing SiC MOSFETs is implemented to validate the theoretical analysis. Experimental results confirm the high efficiency, robust dynamic response, and practical feasibility of the proposed converter for next-generation power conversion applications. © 2013 IEEE.