Faculty Publications
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Publications by NITK Faculty
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Item Ripple Current Reduction of Double-Gain SEPIC Converter Using Coupled Inductor(Institute of Electrical and Electronics Engineers Inc., 2022) Diwakar Naik, M.D.; Vinatha Urundady, U.In this paper Input current ripple reduction technique of a Double-Gain SEPIC (DGSEPIC) converter using Coupled Inductor (CI) is proposed. This converter can provide buck-boost non-inverting output voltage by maintaining continuous input current. The voltage gain of this converter is twice that of a conventional SEPIC converter, so this converter is capable of providing a wide range of output voltage variations by changing the converter's duty cycle. The input ripple current of the converter is reduced using CI, which eliminates the use of a high-rating filter circuit at the input side of the converter. This converter needs a single switch and a few additional inductors and capacitors to obtain twice the voltage gain. Since the converter has only one switch, the complexity of the controller design is less. A PI (Proportional and Integral) controller with Pulse Width Modulation (PWM) technique is used to control the gate pulses of the converter. The simulation of the converter is done using MATLAB/Simulink software, and the results of the Double gain SEPIC converter with CI are presented. © 2022 IEEE.Item A Novel Dual-Input Single-Output High-Gain DC-DC Converter for Interfacing Fuel Cell with High-Way Charging Station Applications(Institute of Electrical and Electronics Engineers Inc., 2025) Diwakar Naik, M.D.; Vinatha Urundady, U.This article presents a novel dual-input single-output high-gain dc-dc converter designed specifically for interfacing fuel cells (FCs) with high-way charging station applications. The converter boasts several notable features, including high output voltage gain achieved with only two switches, continuous input current, reduced switch stress, and the ability to provide a reliable continuous power supply. This article elucidates the two operating modes of the converter along with their corresponding switching states. In addition, it delves into the design and analysis of the proposed converter, covering various aspects, such as the development of a state-space model and the derivation of the small-signal transfer function to comprehend the dynamic behavior of the converter. Moreover, a suitable control strategy using the k-factor method has been devised to effectively regulate the output voltage and ensure stability, even in the face of input voltage fluctuations. To validate the effectiveness of both the proposed converter and controller, a 150-W prototype was meticulously constructed and experimentally verified in a laboratory setting. © 2024 IEEE.