Faculty Publications
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Item A Negative Embedded Differential Mode ?-Source Inverter with Reduced Switching Spikes(Institute of Electrical and Electronics Engineers Inc., 2020) Reddivari, R.; Jena, D.Magnetically coupled impedance source networks (MCIS) are capable of producing higher voltage gains at the expense of high switching voltage spikes due to the presence of leakage inductance. These voltage spikes decorate the converter efficiency and life expectancy of switches. Therefore, to reduce the voltage spikes, a negative embedded differential mode gamma source inverter (NEDM ${{\Gamma }}$ ZSI) is presented in this brief. The proposed inverter can achieve higher voltage gains with reduced switching voltage spikes and low capacitor voltage stresses compared to other MCIS networks. Also, the proposed inverter draws continuous input current from the dc mains, having a common ground, and uses the minimum number of component in a circuit. The operating principle of the proposed NEDM ${{\Gamma }}$ ZSI is analyzed in electrical and magnetic domains. The ability of the proposed impedance network, in terms of voltage spike suppression has been verified experimentally using DC-DC converter configuration. Finally, the performance of a NEDM ${{\Gamma }}$ ZSI is validated with simulation and experimental verification using a single-phase inverter configuration. © 2004-2012 IEEE.Item A cost-effective single-phase semi flipped gamma type magnetically coupled impedance source inverters(John Wiley and Sons Ltd, 2021) Gautham, T.N.; Reddivari, R.; Jena, D.This paper presents a new two winding coupled inductor architecture for a semi magnetically coupled impedance source (SMCIS) inverter by connecting the coupled inductor windings in flipped gamma fashion. The proposed topology is derived from the conventional MCIS inverters. It can produce sinusoidal output voltage/current without using any shoot-through operation and output LC filter, which improves the system reliability. Further, a doubly grounded feature, no start-up inrush current, reduced component count, low input current ripple, continuous output currents, and small leakage currents are the major advantages of the proposed inverter. However, the proposed semi flipped gamma MCIS inverters still suffer from limited output voltage gain problem. The voltage-boosting feature is added to the proposed inverter by connecting two converter modules in differential boost configuration through the embedded structure. The voltage-boosting ability is the major advantage of this differential boost embedded configuration. It has flexibility in choosing a wide range of duty cycle operation from zero to one (whereas, the duty cycle was limited to 0.666 in case of semi-Z-source inverter [ZSI]). The modes of operation, design procedure, and feature comparisons of proposed inverters are discussed in this paper. Finally, the effectiveness of proposed inverters is validated through simulation and experimental results in terms of component count, voltage gain, and feature comparison. © 2020 John Wiley & Sons, Ltd.Item Semi-λ Type Single Phase Differential Boost Inverter With High Voltage Gain(Institute of Electrical and Electronics Engineers Inc., 2023) Gautham, T.N.; Reddivari, R.; Jena, D.The conventional differential boost inverters have limited voltage gain due to the inductor's parasitic resistance, which limits the output voltage ranges as the duty cycle approaches unity and causes a narrow input voltage range. Moreover, it is also vulnerable to shoot-through problems and a dc-offset problem that leads to high voltage stress across capacitors. The proposed two winding magnetically coupled semi Γ-type structures produce high voltage boosting with decreasing turns ratio (1 < K < 2). The modified PWM scheme is implemented to operate the proposed inverter to overcome the dc-offset problem in output capacitors, which further reduces the voltage stress on the system. Furthermore, provides step-up sinusoidal output voltage/current without LC-filter, dead time, and shoot-through operation. The designed prototype is analyzed for Silicon and silicon carbide (SiC) switch using PSIM thermal module. The features of the proposed inverter are comprehensively compared with state-of-the-art topologies. Finally, the simulation and experimental findings verify the proposed topology. © 2004-2012 IEEE.Item A Novel Cubic Boost Converter With Continuous Source Current for PV Applications(Institute of Electrical and Electronics Engineers Inc., 2024) Srinivas, B.; P, P.; Nagendrappa, H.; Balasubramanian, B.A converter with high voltage gain is generally necessary for interfacing the photovoltaic (PV) systems with grid. However, more semiconductor components are needed to obtain a higher voltage gain, which results in increased losses. This brief proposes a novel non-isolated cubic boost (NNICB) DC-DC converter for high-voltage PV applications with a wide voltage gain at a lower duty ratio. Compared to traditional high-gain DC-DC converter, the NNICB converter counters the drawbacks of increased component count and high voltage stress. The NNICB DC-DC converter has a continuous source current for PV applications with low-voltage stress across the diodes and switches. A detailed steady-state analysis of the NNICB topology is carried out for the ideal and non-ideal models, and their corresponding voltage gain equations are computed. Furthermore, the analysis is performed using MATLAB/Simulink and is validated using a 230 W laboratory prototype. The experimental results show that the efficiency of the proposed NNICB topology is 94.42% with a voltage gain of 10.5 at 45% duty ratio. This proves the superior performance of the proposed novel converter in comparison with the existing topologies. © 2004-2012 IEEE.Item Single-Switch Continuous Current High-Gain DC-DC Converter with Common Ground for Vehicular Applications(Institute of Electrical and Electronics Engineers Inc., 2025) Shetty, S.; Prahllada, A.M.; Vinatha Urundady, U.Efficient power conversion is essential for integrating fuel cells into hybrid vehicles, where high voltage gain, minimal switching devices, high efficiency, and low input current ripple are critical for performance. This paper presents a high-gain quadratic boost DC-DC converter tailored for fuel cell hybrid vehicles, utilizing a switched inductor-capacitor technique with a clamping circuit to reduce voltage stress while maintaining a common ground structure. The converter’s operation, component design, and controller development are analyzed in detail, with comparisons to existing high-gain topologies. A 400V, 200W prototype was constructed and tested under varying supply and load conditions, achieving a maximum efficiency of 93.5% with a gain of 13.33 at 58% of rated power. To validate its performance, a 20% step change in the input voltage was tested, demonstrating a robust transient response. This aligns with practical fuel cell systems, where reactant partial pressure regulation typically keeps input voltage variations within 20%. Experimental results confirm the converter’s scalability for fuel cell vehicle applications, underscoring its potential to advance sustainable automotive technologies. © 2013 IEEE.Item High-Gain Nonisolated DC–DC Converter with Zero Input Current Ripple for Fuel Cell Electric Vehicles(Institute of Electrical and Electronics Engineers Inc., 2025) Shetty, S.; Mishra, S.; Vinatha Urundady, U.This paper presents a novel single-switch, common-ground high-gain DC–DC converter for vehicular applications, integrating a Current Mirror Ripple Cancellation Circuit (CMRCC) to achieve a continuous input current with negligible ripple. The proposed power stage incorporates one switched inductor–capacitor (SLC) cell and one switched capacitor (SC) cell, along with a clamping circuit to reduce voltage stress on the switching device, thereby enhancing efficiency and reliability. This configuration delivers high voltage gain while maintaining control simplicity through a single-switch design and minimizing electromagnetic interference via the common-ground structure. A comprehensive theoretical analysis is provided, covering voltage gain, efficiency, component stress, and open-loop stability. A 48 V/400 V, 350 W laboratory prototype was developed to validate the proposed design under dynamic load and source variations, achieving a peak efficiency of 94.4%, an input current ripple below 1%, and a transient deviation of less than 10% under 30% load and 20% source step changes. These results confirm that the proposed integrated approach offers a compact, high-performance, and application-ready solution for electric vehicle powertrains and renewable energy systems. © 2015 IEEE.Item 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.