Faculty Publications
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Item DC-link current based position estimation and speed sensorless control of a BLDC motor used for electric vehicle applications(De Gruyter Open Ltd, 2021) Febin, F.D.; Jayan, J.; Srinivasan, M.K.; Prabhakaran, P.Sensors of any kind contribute to extra space and electronics when they are used in any application. Besides, the sensor noise also has the effect of altering the overall gain of the system. This is more prevalent in non-linear systems like motor control. In applications which have strict space constraints like Electric vehicles, the use of sensors must be optimized, which, in turn, gave rise to many sensorless state estimation strategies. This paper proposes a novel sensorless control technique for brushless direct current (BLDC) motor used in electric vehicle applications. The concept of sensorless control in BLDC Motor drive eliminates the hall-effect position sensor, thereby giving better performance and improves the robustness of the overall drive system. The main objective of this work is to estimate the position of the motor at standstill condition using stator saturation effect concerning the rotor, accelerate the motor from standstill so that enough back EMF is generated. This acceleration technique speeds up the motor to a stage where a self-actuating control mechanism is used to generate control signals with back EMF or line voltages. The motor can be started with a load, which is a significant constraint for electric vehicle application. The proposed method will avoid the reverse rotation of the motor. The proposed work is simulated in Matlab/Simulink software, and results obtained show that it works well under dynamic conditions of starting, acceleration and load switching. The hardware setup of the proposed work is developed using the TMS320F2812 DSP processor. Simulation and experimental results validate the effectiveness of the proposed work for electric vehicle application. © 2021 Walter de Gruyter GmbH, Berlin/Boston 2021.Item A Bidirectional Interleaved Totem Pole PFC-Based Integrated On-Board Charger for EV SRM Drive(Institute of Electrical and Electronics Engineers Inc., 2024) Faheem Ali, T.; Arun Dominic, A.D.; Prabhakaran, P.; Parameswaran, A.P.This paper presents an improved integrated on-board charger (IOBC) tailored for a 4-phase switched reluctance motor (SRM) drive. The proposed IOBC is non-isolated and utilizes the totem pole power factor correction (PFC) operation for reduced common-mode voltage. Furthermore, the proposed system accommodates bidirectional functions, ensuring versatility during charging mode. A non-isolated IOBC for SRM with reduced common-mode voltage and bidirectional capability has largely been ignored in the literature. The proposed system utilizes a modified Miller converter in the motoring mode and is easily reconfigured into a two-phase interleaved totem pole converter during charging modes without the need for any magnetic contactors. The proposed system features zero instantaneous torque (ZIT) at steady-state, ensuring minimal machine wear during charging modes. The proposed IOBC is controlled to ensure symmetric positive and negative grid currents for any given rotor position (during charging), thereby eliminating even harmonics and enhancing the power quality of grid current. The proposed system achieves charging power twice the motoring power with parallel-connected phase windings. Ansys electromagnetic transient simulation, MATLAB-based SRM drive simulations, experimental results, and comprehensive comparative analysis are presented to validate the various features and effectiveness of the proposed IOBC for SRM. © 2013 IEEE.Item An Integrated Onboard EV Charger With Wide Voltage Range Compatibility(Institute of Electrical and Electronics Engineers Inc., 2025) Kumar, V.; Prabhakaran, P.; Reddy, B.D.; Febin, J.L.F.Electric vehicles (EVs) typically employ separate onboard chargers and traction inverters for battery charging and motor operation, respectively. This paper proposes a bidirectional integrated onboard charger (BIOC) that utilizes a single power converter to perform both functions, thereby reducing cost, improving system compactness, and supporting fast charging. The proposed BIOC architecture is implemented using a totem-pole power factor correction (PFC) stage combined with an additional coupling unit. This configuration supports a wide range of battery voltages and is compatible with both AC and DC grid inputs. The BIOC incorporates active power decoupling (APD) to minimize voltage ripple at the battery terminals during high-voltage (HV) battery charging. Leakage current analysis of the totem-pole PFC stage confirms compliance with safety standards, and a detailed switch loss calculation procedure is presented. A comprehensive controller design is developed using State-Space Averaging (SSA) and Small Signal Modelling (SSM), followed by a K-factor method to ensure optimal performance across various operating modes. The proposed system is validated through simulations on a 2 kW Simulink model and experimental testing on a 400 W scaled-down prototype, demonstrating effective charging of an EV battery across a wide voltage range from both AC and DC grids. This work offers a unified, efficient, and cost-effective solution for integrated onboard EV charging. © 2013 IEEE.Item A Transformerless Bidirectional Active Switched Inductor-Based SEPIC High-Gain DC–DC Converter With Buck–Boost Capability(Institute of Electrical and Electronics Engineers Inc., 2025) Mandal, S.; Prabhakaran, P.; Dominic, D.A.; Parameswaran, A.P.The growing demand for efficient and compact power conversion systems in electric vehicles (EVs), renewable energy systems, DC microgrids, and both portable and stationary medical equipment has intensified research into non-isolated high-gain bidirectional DC-DC converters. Existing solutions often employ transformer-based topologies or coupled inductors, which introduce increased cost, size, and control complexity. This paper presents a novel transformerless bidirectional high-gain DC-DC converter based on a modified Single-Ended Primary Inductor Converter (SEPIC) architecture. The proposed topology incorporates an Active Switched Inductor (ASL) at the input stage to achieve a wide voltage conversion ratio while ensuring reduced voltage stress on the maximum power switches. A key feature of the converter is its ability to provide bidirectional buck–boost operation in both power flow directions, while maintaining a reduced component count and improved efficiency through synchronous rectification. The converter’s performance is thoroughly analyzed under both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). Furthermore, detailed small-signal modeling and closed-loop controller design are developed for both voltage-mode and current-mode control. A 200 W experimental prototype employing SiC MOSFETs is implemented to validate the theoretical analysis. Experimental results confirm the high efficiency, robust dynamic response, and practical feasibility of the proposed converter for next-generation power conversion applications. © 2013 IEEE.