Faculty Publications
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Item Recent advancements in switched capacitor-based multilevel inverters(River Publishers, 2025) Kumar, D.; Raushan, R.; Kumari, D.; Bhushan, R.This chapter comprehensively reviews recent advances in switched capacitorbased multilevel inverters (SCMLIs) within the realm of power electronics. It outlines the fundamental principles of multilevel inverters, underscoring the role of switched capacitors in achieving higher voltage levels and refined waveform quality. The chapter critically examines the challenges in switched capacitor-based multilevel inverter designs, emphasizing recent research on circuit topologies and modulation strategies, including aspects like voltage balancing. Moreover, it discusses the integration of SCMLIs in electric vehicles and renewable energy systems and highlights their potential to enhance efficiency, improve power quality, and seamlessly integrate with modern power grids. The chapter succinctly captures the forefront of SCMLI technology, offering insights into its transformative impact on ongoing innovation to address evolving challenges in inverter topologies. © 2025 River Publishers. All rights reserved.Item Five-Level Switched Capacitor Inverter for Photovoltaic Applications(Taylor and Francis Ltd., 2022) Singh, A.K.; Mandal, R.K.; Raushan, R.; Anand, R.This paper proposes a switched-capacitor based single-phase five-level inverter configuration that operates under boost operation and generates a voltage that is more than the DC source voltage. The proposed five-level inverter uses a capacitor and boots the output voltage. In this proposed inverter, capacitor gets charged in parallel while it discharges in series connections so that output voltage may attain higher magnitude than the DC source voltage. Sinusoidal Pulse Width Modulation-based techniques are considered to produce the required gate pulses for operating the switching devices of the inverter. The five-level switched-capacitor inverter is combined with the PV system via DC–DC boost converters to extract the maximum power using MPPT algorithm. To verify its capability, the PV-based system is further integrated to the utility grid. The operation and performance of the suggested switched-capacitor inverter coupled with the grid-connected PV system are also analyzed by developing its model in MATLAB/Simulink environment. © 2022 IETE.Item A New Single-Source Nine-Level Quadruple Boost Inverter (NQBI) for PV Application(Institute of Electrical and Electronics Engineers Inc., 2022) Singh, A.K.; Raushan, R.; Mandal, R.K.; Ahmad, M.W.Multi-level inverters (MLIs) with switched capacitors are becoming popular due to their utilization in AC high-voltage applications as well as in the field of renewable energy. To achieve the required magnitude of output voltage, the switched capacitor (SC) technique employs a lesser number of DC sources in accordance with the voltage across the capacitor. Designing an efficient high-gain MLI with fewer sources and switches needs a rigorous effort. This paper introduces a prototype of a nine-level quadruple boost inverter (NQBI) topology powered by one solar photo-voltaic source using fewer capacitors, switches, and diodes when compared to the other SC-MLIs topology. The suggested NQB inverter produces nine levels of voltage in its output by efficiently balancing the voltages of the two capacitors. The various SC-MLIs are compared in order to highlight the benefits and drawbacks of the proposed nine-level quadruple boost inverter (NQBI) topology. To validate the efficacy of the proposed solar photovoltaic based NQBI without grid connection, detailed experimental results are presented in a laboratory setting under various test conditions. © 2013 IEEE.Item A Single Source Quadruple Boost Nine-Level Switched-Capacitor Inverter with Reduced Components and Continuous Input Current(Institute of Electrical and Electronics Engineers Inc., 2024) Kumar, D.; Raushan, R.; Chakraborty, S.The multilevel inverter (MLI) serves as a pivotal class of power electronic converters, well-suited for high-power applications at medium voltage levels, ensuring superior power quality. While designing an MLI, there is a motif among the number of components, voltage stress on the semiconductor devices, and its voltage-boosting ability. A single source nine-level switched-capacitor based novel inverter with reduced components has been proposed in this paper. The proposed H-bridge based switched capacitor inverter topology employs nine switches, two capacitors, two diodes, and one DC source. The inverter has a quadruple voltage boost and the ability to draw continuous input current from the DC supply and self-voltage balance with a voltage ripple of less than 5%. A comprehensive study of performance parameters, design consideration, and loss analysis of the proposed inverter is also incorporated. A level-shifted pulse width modulation technique is implemented to operate the inverter for unity to 0.5 lagging load power factors and 1-0.2 modulation indices. The dynamic responses of the proposed switched capacitor inverter topology are obtained through MATLAB simulation for analysis and further validated by hardware prototype. © 2013 IEEE.Item A Novel Single Source Bridgeless Nine-Level Switched-Capacitor-Based Quadruple Boost Inverter With Reduced Voltage Stress(Institute of Electrical and Electronics Engineers Inc., 2024) Kumar, D.; Raushan, R.; Ahmad, M.W.; Dutta, S.The attractiveness of switched capacitor multilevel inverters (SCMLIs) stems from their ability to operate without transformers, providing voltage-boosting capabilities, inherent capacitors' voltage balancing ability, and reduced electromagnetic interference. Recent developments in SCMLI structures make it a compelling choice among various converters for diverse applications. The evolution of these topologies is primarily influenced by factors such as the number of output voltage levels, overall voltage gain, and the simultaneous reduction of component counts and stresses on devices. To address these issues further, a novel bridgeless common neutral switched capacitor multilevel inverter has been proposed in this article. The maximum voltage stress on the devices is just half of the peak output voltage, and the total standing voltage is also lower in this inverter. It has quadruple voltage gain and inherent voltage balancing of the switched capacitors. Additionally, it can operate under various loads and modulation indexes. Moreover, the proposed inverter's leakage current can be almost zero due to the presence of the common ground (CG) feature. The nearest level pulse width control technique has been implemented to operate the proposed inverter. Comparative analysis was carried out to show the advantages of the inverter. Further, a hardware prototype of the experimental setup has been developed, and results have been analyzed and discussed to strengthen the performance of the proposed inverter. © 2013 IEEE.Item A Reduced Component Count Self-Balance Quadruple Boost Seventeen-Level Switched Capacitor Inverter(Institute of Electrical and Electronics Engineers Inc., 2024) Ahmed, S.; Raushan, R.; Ahmad, M.W.A switched capacitor multilevel inverter (SCMLI) enables high-quality output voltage waveforms for various industrial and renewable energy applications. SCMLI uses a combination of capacitors and switches to generate multiple voltage levels from a single dc source, thereby reducing the overall cost and size of the system. This article proposes a novel configuration of a 17-level SCMLI. The proposed converter can boost four times the input voltage by exploiting the series-parallel connection of capacitors with the dc voltage source. With simple pulsewidth modulated (PWM) control, the capacitor voltages are inherently balanced under different loading conditions. Furthermore, for 11 switches, only seven independent switching signals are required. Loss analysis reveals that the proposed SCMLI has significantly reduced conduction losses, capacitor ripple voltage, voltage stress, and cost function (CF) when compared with other topologies available in the literature. Finally, the simulation results are obtained at different loads and modulation indexes. The results are experimentally validated with a scaled-down laboratory prototype. © 2024 Institute of Electrical and Electronics Engineers Inc.. All rights reserved.Item An Inductorless Triple Boost 13-Level Switched Capacitor Inverter with Reduced Ripple Current(Institute of Electrical and Electronics Engineers Inc., 2024) Ahmed, M.S.; Raushan, R.; Ahmad, M.W.Switched capacitor (SC) multilevel inverter (SCMLI) is a promising alternative to traditional voltage source inverters for industrial and renewable energy applications. In SCMLI, capacitors are used in a specific sequence during charging and discharging either in parallel or series with the source for level generation. During the charging period of the capacitor, a large ripple current is generated. This ripple may cause an increase in the peak current and ripple voltage of the capacitors. The reliability and life expectancy of the inverter can be severely affected by this ripple current of the capacitor. This article proposes an inductorless self-balance single-phase 13-level inverter with triple boosting capability. It aims to reduce the ripple current in both the source and capacitors by arranging the switching sequence in a particular fashion to implement a partial charging technique in the capacitors. Furthermore, it results in better efficiency and reduced current stress without the need for any source inductance or a complicated control algorithm. The performance of the proposed inverter is verified through its laboratory prototype under dynamic load conditions and varying modulation indexes. © 1986-2012 IEEE.Item A Reduced Capacitance H-9 Five-Level Switched Boost Capacitor Transformerless Inverter(Institute of Electrical and Electronics Engineers Inc., 2025) Ahmed, Md.S.; Raushan, R.; Ahmad, Md.W.Transformerless switched capacitor-based multi-level inverters are well-known for their applications in industrial and renewable energy systems. The primary features of a switched capacitor-based transformerless inverter should be minimizing leakage current for safety and minimizing ripple current for efficiency and reliability. This brief proposes a new single-stage, single-phase, five-level H-9-based transformerless inverter for standalone PV systems. This H-9 inverter, utilizes nine switches to produce the desired output voltage levels. It achieves boost functionalities by combining the switched capacitor (SC) unit with the switched boost (SB) unit in a single design. This topology effectively mitigates the leakage current by virtually grounding the load terminal through the filter capacitor. Furthermore, the ripple current of the capacitors in the switched-capacitor unit is minimized, and it is inherently balanced. To this end, the feasibility of utilizing the modulation technique for control is demonstrated, and the relevant results are experimentally validated using a laboratory prototype of the proposed converter. © 2004-2012 IEEE.