Faculty Publications

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Author: search.filters.author.Manjunath, K.Has files: No

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    Electric energy sources and storage device
    (Institution of Engineering and Technology, 2024) Kalpana, R.; Manjunath, K.; Chiliveri, V.R.; Kiran, R.
    [No abstract available]
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    A Modularized Two-Stage Active Cell Balancing Circuit for Series Connected Li-Ion Battery Packs
    (Institute of Electrical and Electronics Engineers Inc., 2022) Manjunath, K.; Kalpana, R.
    This paper addresses a modularized two-stage active cell balancing topology based on an improved buck-boost converter for a series connected Lithium-ion battery string. The proposed topology has a modular structure, each module consisting of three cells, two inductors, and four MOSFET switches. This technique provides module-to-module balancing in the first stage. Moreover, it can simultaneously target and balance two cells in a module in the second stage. Thus, significantly reduces the cell balancing time and increases the system performance with minimal components. The proposed topology has been theoretically analyzed and experimentally verified with a laboratory prototype. The proposed modularization technique is verified experimentally with two modules tested together in a battery string. © 2022 IEEE.
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    Active Cell Balancing Circuit using Switched inductor Buck-Boost Converter for Li-ion Battery Strings with Maximum Efficiency Operation
    (Institute of Electrical and Electronics Engineers Inc., 2023) Manjunath, K.; Kalpana, R.
    An active cell balancing circuit with maximum efficiency operation using switched-inductor buck-boost converter for series connected battery strings is presented in this paper. The proposed balancing circuit has advantage over conventional balancing circuit, which is the ability to balance non-adjacent cells also. Moreover, it simplifies control complexities by utilizing one pair of complementary PWM signals to balance all the cells within the battery module. To form a single module with three cells connected in series, the proposed balancing circuit requires only two inductors and four switches. The analysis, modes of operation and control strategy of the proposed circuit are described in detail. The energy transfer with the efficiency of 97.7% is achieved with proposed balancing circuit. To verify the proposed circuit, MATLAB/Simulink platform is utilized and a laboratory prototype is developed. © 2023 IEEE.
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    Two Stage Module Based Buck-Boost Converter for Cell Equalization of Series Connected Cells for Electric Vehicle Battery Pack Applications
    (Institute of Electrical and Electronics Engineers Inc., 2024) Nayak, A.K.; Kalpana, R.; Manjunath, K.
    In this paper, a two-stage module-based active cell balancing circuit using a buck-boost converter is proposed. In this technique cell balancing is performed by considering the State of Charge as a balancing criteria. Further to explore modified buck-boost converter topology with inductor and switches being used for balancing adjacent cells. An existing work of two stage module based cell equalization topology is referred. Such topology is aimed at increasing balancing speed by targeting two cells simultaneously. The topology uses fewer components than traditional balancing circuit. Proposed cell balancing is simulated by MATLAB/Simulink. The efficiency and time required for balancing is evaluated. An SOC based control is proposed instead of voltage based control in the proposed topology. Further the efficacy of such circuit in dynamic condition i.e. charging and discharging is evaluated through simulation. © 2024 IEEE.
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    A Two-Stage Module Based Cell-to-Cell Active Balancing Circuit for Series Connected Lithium-Ion Battery Packs
    (Institute of Electrical and Electronics Engineers Inc., 2023) Manjunath, K.; Kalpana, R.; Singh, B.; Kiran, R.
    This article addresses a two-stage module based cell-to-cell active equalization topology based on a modified buck-boost converter for series connected Lithium-ion battery packs. In the proposed topology, initially module based equalizing currents are controlled. Subsequently, cell-based equalizers are controlled in parallel within each battery module. The proposed topology significantly reduces the balancing time by transferring higher balancing current from a strong cell to the weakest cell in a module directly. With the proposed topology's modularized design, reduces voltage stress on long strings of switches, resulting in improved performance with fewer components. The operating principle, control strategy and design constraints are analyzed in detail. The MATLAB/Simulink platform is utilized to demonstrate the feasibility of the proposed technique for balancing the energy in series connected battery cells. To reduce the complexity of the control approach, the digital control is implemented using an FPGA control board. Further, a laboratory prototype is developed to show the feasibility and operability of the proposed topology. © 1986-2012 IEEE.
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    A Modularized Two-Stage Active Cell Balancing Topology With Reduced Balancing Time for Series Connected Li-Ion Battery String
    (Institute of Electrical and Electronics Engineers Inc., 2025) Manjunath, K.; Kalpana, R.; Singh, B.
    This paper introduces a modularized two-stage active cell balancing topology utilizing an improved buck-boost converter for a series-connected lithium-ion battery string. The proposed topology adopts a modular structure where each module comprises three cells, two inductors, and four MOSFET switches. The voltage monitoring circuit controls the switches to ensure each cell has same voltage by transferring charge from a source cell to target cell. This approach enables module-to-module balancing through a module equalizer while simultaneously targeting two cells within a module through a cell equalizer. Using modularization technique in the proposed topology, the balancing time is reduced significantly compared to cell equalization circuit. Moreover, using a combination of cell and module balancing, the balancing time is reduced effectively compared with performing cell balancing only under dynamic charging/discharging conditions. This methodology substantially reduces cell equalization time and enhances system performance with minimal components. Proposed topology is verified theoretically and experimentally with a five-module battery string under static and dynamic conditions. © 1972-2012 IEEE.