Browsing by Author "Vignesh Kumar, V.V."

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    A Study on High-Frequency Transformer Design with Different Core Configurations for Flyback Converter Topology
    (Institute of Electrical and Electronics Engineers Inc., 2023) Vignesh Kumar, V.V.; P, P.; Vangapally, A.; Balasubramanian, B.
    The rapid advancements in the switched mode regulator technology necessitate an effective magnetic circuit for the converter topology. The design of magnetics plays a vital role in achieving the essential requirements of switching regulator circuits such as high-power density level, low thermal dissipation and high efficiency. Hence, this paper is focused on the high-frequency practical transformer design for flyback topology that is most widely used in the switched mode power supplies units. A case study is performed by employing different core configuration for high frequency flyback transformer which is the main contribution of this paper. The comparative performance analysis in terms of the dimensions, losses incurred and efficiency is reported for selecting the proper choice of core for the flyback topology. © 2023 IEEE.
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    Performance Analysis and Loss Estimation of an AC-DC PFC Topologies of an EV Charger
    (Institute of Electrical and Electronics Engineers Inc., 2023) Gupta, S.; Vignesh Kumar, V.V.
    The front-end AC-DC power factor correction (PFC) converter of an electric vehicle (EV) charger is essential to achieve the grid side power factor close to unity and maintain the input current total harmonic distortion (THD) within permissible limits. The other desirable attributes are high power density, high efficiency, and simple structure. However, several articles have discussed the different PFC topologies to achieve these qualities with the difference in the number of switching devices employed and conduction modes. So, this paper aims to present the design and performance comparison of four common PFC topologies. Further, the loss analysis using the datasheet parameters of switching devices and operational modes of the PFC converters have been discussed. The converters, namely, active boost PFC, interleaved-boost PFC, dual boost PFC and totem-pole PFC, have been designed for CCM operation with the output power/voltage of 3. 3kW/400V. Moreover, these topologies are simulated in MATLAB/ Simulink, and their performances in terms of the amount of THD in input current, output voltage regulation, and switching losses have been obtained. The analysis shows that the bridgeless totem-pole PFC converter shows superior performance among all four topologies taken for study due to a low number of switching devices in the current conduction path and reduced switching losses. © 2023 IEEE.
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    Performance Analysis of Multiphase Interleaved boost converter topologies for FCEV applications
    (Institute of Electrical and Electronics Engineers Inc., 2023) Garg, P.; Vignesh Kumar, V.V.; Kumar, S.
    This paper investigates the performance of multiphase interleaved boost converter topologies for fuel cell electric vehicle (FCEV) system. Fuel cells (FC) have a low voltage and high current characteristics. The output voltage of a fuel cell stack must be increased to approximately 400V ∼ 700V to be suitable for the motor drive system. Therefore, a DC/DC step-up converter is crucial for interfacing fuel cell stack with the DC bus of the vehicle.Owing to the volumetric constraints and other performance requirements, the FC connected DC/DC converter is expected to possess high power density, low weight, high efficiency and good thermal performance. Further, it is of paramount importance to maintain the output current ripple of FC for its enhanced life span. Interleaved boost converter (IBC) topologies are found to satisfy all these requirements of FCEV application. Hence in this paper, a performance comparison of few interleaved topologies appropriate for FCEV drive train is presented. It is observed that six phase IBC is superior to other two variants namely two phase and four phase IBC. The output voltage, input current and losses are analysed for all the three topologies. The design of the closed loop control algorithm is discussed lucidly. The results of extensive simulations carried out in MATLAB environment are presented. © 2023 IEEE.