Browsing by Author "Vinusha, B."

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    A Non-Isolated Buck-Boost DC-DC Converter for On-Board Electric Vehicle Powertrain
    (Institute of Electrical and Electronics Engineers Inc., 2023) Vinusha, B.; Kalpana, R.; Kishan, D.
    In this paper, a non-isolated buck-boost DC-DC converter for on-board electric vehicle powertrain is proposed. It has a universal-input voltage capability for the requirement of power factor correction in electric vehicles. It can be operated in buck, boost, or pass-through modes to optimize performance depending on the operating conditions. It has advantages of lower switch voltage stresses, reduced size of the magnetics and lower inductor conduction losses in comparison to single-switch buck-boost converters or other two-switch buck-boost converters. The operation of the converter in buck and boost modes is discussed in detail, followed by necessary mathematical modelling. To validate the effectiveness of proposed converter, simulation studies are carried-out with the help of MATLAB-Simulink. © 2023 IEEE.
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    A Three-Phase Isolated Multilevel AC-DC Converter for Dual Electric Vehicle Battery Charging
    (Institute of Electrical and Electronics Engineers Inc., 2025) Vinusha, B.; Kalpana, R.; Kishan, D.
    In this paper, a two-stage electric vehicle (EV) architecture of an AC-DC converter is proposed for charging two batteries at a time. It consists of a three-phase multilevel boost PFC converter followed by a bidirectional dual-output DC-DC converter. Also, the DC-DC converter has a Zero voltage switching (ZVS) and isolated outputs. The two stages function independently, allowing the AC-DC stage to operate in continuous conduction mode (CCM) without affecting the duty cycle variation of the DC-DC stage. A suitable control technique is also proposed to improve total harmonic distortion (THD) and power factor, equal power sharing of two batteries. A detailed operating analysis of the proposed dual battery charger is discussed. The effectiveness of the proposed charger is validated by extensive test of laboratory prototype. © 1972-2012 IEEE.
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    A Two Switch Multiport Non-Isolated DC-DC Converter for On-Board EV Charging Application
    (Institute of Electrical and Electronics Engineers Inc., 2024) Vinusha, B.; Kishan, D.; Kalpana, R.
    This paper proposes multiport DC-DC converter for on-board charger (OBC) EV applications with simultaneous charging of high voltage (HV) battery and low voltage (LV) battery. The evolution of this converter involves replacing the switch found in a conventional step-up converter with a pair of series-connected switches. This arrangement allows for an additional switch node that generates a LV output. the proposed converter has benefits of high voltage gain for HV side, continuous input current, a reduced switching count, regulation of two battery voltages with two switches. Moreover, the inherent shoot-through protection enhances the converter's reliability. The proposed converter exhibits same working principle as that of conventional boost and buck converters. Consequently, the control system methodology remains consistent with that of separate converters, ensuring precise regulation of each output. The working principle, design analysis is discussed. To validate the theoretical analysis, detailed simulation results are presented. © 2024 IEEE.
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    An Integrated EV Battery Charger With Three-Level Boost PFC Converter and H5-Bridge Based Bidirectional DO-CLL Series Resonant Converter for Wide Battery Voltage Range
    (Institute of Electrical and Electronics Engineers Inc., 2025) Vinusha, B.; Kalpana, R.; Kishan, D.
    This article proposes an efficient two-stage ac–dc converter for off-board electric vehicle charging applications over a wide range of battery voltages. The proposed charger integrates a three-phase three-level boost power factor correction (TL-BPFC) converter with a bidirectional dual-output CLL (DO-CLL) series resonant converter. In the ac–dc conversion stage, three switches are controlled using a hysteresis technique to enhance input power quality. The second stage, responsible for dc–dc conversion, incorporates an H5-bridge on the primary side and a voltage doubler circuit on the secondary side, providing decoupled outputs through two high-frequency transformers (HFTs) connected to resonant tanks. This configuration allows flexible adjustment of the resonant tank inputs, which can operate in full-bridge (FB), half-bridge (HB), or inactive (IA) modes. This design provides a key advantage of a wide voltage range during forward and reverse operation using reconfigurable H5 bridge. Additionally, the switches in the DO-CLL achieve zero-voltage switching (ZVS) during turn-on, and the identical HFTs minimize the cross-coupling effect, to enhance the efficiency. A scaled-down laboratory prototype of the off-board EV charger is developed to provide two distinct outputs of 400 V and 200 V, achieving an overall efficiency of 97.6%. © 1982-2012 IEEE.
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    Analysis of Integrated on-Board Charger for 400 V and 800 V EV Battery Using Dual-Mode Three-Leg LLC Resonant Converter
    (Institute of Electrical and Electronics Engineers Inc., 2024) Vinusha, B.; Vinod, M.; Kishan, D.; Kalpana, R.
    Electric vehicle technology is rapidly advancing to achieve higher power density and cost-effectiveness. On-board chargers (OBC) are evolving to support new power ratings and battery technologies, focusing on higher power and voltage capabilities to enhance power density and reduce recharge times. This paper proposes a novel three-leg LLC (TL-LLC) resonant converter for an On-board EV charger, designed to charge different EV models efficiently. By adopting a variable DC-link voltage as input, the converter tracks a wide battery voltage range, ensuring optimal efficiency. It operates in two modes: voltage doubler for 800-V charger and current doubler for 400-V charger at 10 kW power rating. MATLAB/Simulink simulations verify the converter's performance for both battery types at 10 kW power level. © 2024 IEEE.
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    Design and Implementation of Dual-Mode LLC Resonant Converter for Charging 400 V and 800 V Onboard Plug-in Electric Vehicles
    (Institute of Electrical and Electronics Engineers Inc., 2025) Vinusha, B.; Kalpana, R.; Kishan, D.; Chub, A.
    Lithium-ion batteries used in electric vehicles (EVs) are generally rated at either 400 V or 800 V. Onboard chargers (OBCs) are evolving to support both voltage levels and high-power capabilities to enhance system efficiency. The plugin onboard EV chargers need to charge both voltage levels efficiently. Typically, this is achieved by regulating the output voltage through an additional DC-DC converter. However, this approach adds complexity to the circuit design. This article proposes a dual transformer based dual-mode LLC resonant (DM-LLCR) converter for charging 400 V and 800 V battery packs. The proposed converter can operate in voltage doubler mode to charge an 800 V battery or in current doubler mode to charge a 400 V battery. The proposed converter has a reduced switch count compared to the conventional dual transformerbased LLC resonant converter topologies. The operation of the proposed converter is validated in MATLAB/Simulink at a power rating of 10 kW. To further evaluate the feasibility of the proposed converter, a scaled-down 1 kW laboratory prototype was developed. The peak efficiency recorded is 96.4% for the voltage doubler mode and 96% for the current doubler mode. © 2025 IEEE.
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    Improved Power Quality of Single Phase On-Board Charger with Wide Voltage Conversion Range
    (Institute of Electrical and Electronics Engineers Inc., 2023) Vinusha, B.; Kalpana, R.; Kishan, D.
    For electric vehicle applications, there is a persistent need for on-board chargers that are dependable, effective, compact, and lightweight. In this paper, a non-isolated two-switch buck boost (TSBB) topology is presented for a single-phase on-board charger, which can offer significantly improved performance over single-switch buck-boost converters as SEPIC, CUK, or fly back topologies or other two-switch buck-boost converters. The advantage of this on-board charger is that it can perform high input power quality over a wide output voltage conversion range. This paper presents an analysis of the various modes of the converter and small signal analysis of the converter to design the controller. To validate the effectiveness of the converter simulations results are presented with the help of MATLAB-Simulink. © 2023 IEEE.