Faculty Publications

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Author: search.filters.author.Nagendrappa, N.Subject: search.filters.subject.Fixed frequency

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    A 10 kW ZVS integrated boost dual three-phase bridge DC–DC resonant converter for a linear generator-based wave-energy system: Design and simulation
    (MDPI AG indexing@mdpi.com, 2019) Nagendrappa, N.; Bhat, A.K.S.
    The design and performance analysis of a 10 kW three-phase DC–DC LCL-type resonant converter having a built-in boost function were carried out. This high-power converter is proposed for its application in grid-interfacing a linear generator (LG)-based wave-energy system. Fixed-frequency control is used, and the converter was designed to operate with a lagging power factor. It is shown that all switches turn on with zero-voltage switching (ZVS) for wide input voltage and load variations. This results in reduced switching losses and stresses, which is very important in large-power applications. The performance of the converter was studied through PSIM simulation software. Theoretical and simulation results are presented for comparison. Power-loss break-down analysis of the designed converter was carried out and the summary of results is presented. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.
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    Fixed-frequency modified gating signals controlled high-frequency isolated LCL-T DC-DC resonant power converter
    (Taylor and Francis Ltd., 2025) Reddy, V.B.; Ur Rehman, M.B.; Srinivas, B.; Nagendrappa, N.
    In this paper, a fixed-frequency modified gating signals controlled LCL-T type of resonant power converter is proposed. The converter is designed to operate in lagging power factor (pf) mode to ensure zero-voltage switching (ZVS) of the inverter switches. Steady-state analysis of the converter is carried out using the Fourier series approach by considering the effect of n-harmonics. A 300 W converter is designed, and its performance is studied using PSIM simulations. It is shown that all inverter switches turn-on with ZVS for entire loading conditions with the minimum input voltage, while only one switch loses ZVS when the input voltage is maximum. Also, a small change in pulse width is enough to regulate the output voltage for wide variations in the input voltage and the load. Power loss breakdown analysis is performed. The experimental prototype of the LCL-T resonant converter is built and tested to validate the theoretical and simulation results. The results have been compared and discussed. © 2024 Informa UK Limited, trading as Taylor & Francis Group.