Faculty Publications
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Item Three-Leg DC-DC Converter for Efficient Inductive Power Transfer of Electric Vehicles for Wide-Range Battery Applications(Institute of Electrical and Electronics Engineers Inc., 2023) Vinod, M.; Kishan, D.; Dastagiri Reddy, B.D.The design of an inductive power transfer system for different electric vehicle (EV) models with widely varied battery pack voltages has been a challenging task. The majority of modern EV models are equipped with 400 or 800 V battery packs. To charge both batteries efficiently, an additional dc-dc converter on the receiver side is employed, which reduces the overall system efficiency and also increases the cost. This letter proposes a reduced switch count novel converter to charge distinct EV models without degrading the efficiency of the system. The proposed converter has two operating modes, a voltage doubler mode to charge an 800 V battery and a current doubler mode to charge a 400 V battery at the same power level. MATLAB/Simulink simulations have been carried out to verify the performance of the three-leg converter for both 400 and 800 V batteries at 7.2 kW. Furthermore, a laboratory prototype of the proposed converter for 500 W has been built using the silicon carbide (SiC) devices, and the results obtained are provided. © 1986-2012 IEEE.Item Efficient and cost-effective wireless CC/CV charging for electric vehicles: A bipolar duty cycle approach(Elsevier Ltd, 2024) Vinod, M.; Kishan, D.; Dastagiri Reddy, B.D.; Nagendrappa, N.Inductive Power Transfer (IPT) has gained significant popularity in recent times, particularly in electric vehicle (EV) battery charging applications. To achieve optimal battery charging, it is imperative to implement both constant current (CC) and constant voltage (CV) modes of operation. Traditionally, CC/CV modes are attained through conventional phase shift techniques, frequency modulation schemes, the use of active converters, and additional compensator circuits and coils. However, these conventional methods not only reduce system efficiency but also escalate overall costs and control complexity on the onboard side. This article proposes a novel bipolar duty cycle control strategy for a series–series resonant IPT system, aiming to achieve CC/CV modes of operation. The proposed control strategy increases the number of switches operated with zero voltage switching, compared to other fixed-frequency phase shift control strategies across a wide load range. Furthermore, the article provides a detailed procedure for implementing the voltage and current compensator. Additionally, it describes the construction of a one-kilowatt laboratory prototype using Sic devices, presenting the obtained results. The peak measured DC–DC efficiency of 93.8 % is achieved at a distance of 150 mm, and the efficiency has also been evaluated under misalignment conditions. © 2024 Elsevier LtdItem A dual full-bridge series-series resonant IPT system for ultra-wide-range electric vehicle battery applications(Springer Science and Business Media Deutschland GmbH, 2025) Vinod, M.; Kishan, D.The design of inductive charging systems presents a significant challenge for various electric vehicle models, each equipped with diverse battery packs ranging from 200 to 800 V. Typically, DC–DC converters, along with diode bridge rectifiers or controlled rectifiers, are employed to accommodate this wide battery voltage range. However, this conventional approach increases vehicle weight and introduces greater control intricacies. In response, this article proposes a wide-gain converter with two sets of coupled coils to charge batteries of different voltage ranges without compromising system efficiency. The proposed system operates in four modes: voltage doubler mode, current doubler mode, full-bridge mode, and half-bridge mode, which has high voltage gain, high current gain, medium voltage gain, and low voltage gain operations. The simulations have been performed using MATLAB-Simulink software to validate the efficacy of the dual full-bridge converter across various battery voltages (800 V, 400 V, and 200 V) and power levels. Furthermore, a laboratory prototype has been built with SiC devices to further validate the proposed converter. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.