Faculty Publications
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Item Performance evaluation of multi-input converter-based battery charging system for electric vehicle applications(CRC Press, 2023) Kalpana, R.; Kiran, R.; Parthiban, P.This chapter address a dual-input half-bridge DC–DC converter with semi-active full-bridge rectifier at secondary. The proposed configuration is satisfactory to provide power supply to load and instantaneously charge the battery. The proposed configuration has three stages. It includes input variable sources; the isolation stage consists of two HFTs (High Frequency Transformer), and the rectifier stage consists of a semi-active full-bridge rectifier at secondary with a bidirectional buck boost converter for charging and discharging the battery. Complete steady-state analysis and design of the converter have been investigated. An FPGA-based controller was used to implement digital closed loop control in order to minimize the control strategy's complexity. A constant current/constant voltage (CC/CV) mode of control algorithm has been implemented for charging the battery in order to achieve higher efficiency and protection of the battery. The battery charging current is controlled by the output current control loop and has low output voltage ripple, which leads to high efficiency of the system. To confirm the feasibility of the proposed system, an experimental prototype has been developed. Extensive tests have been carried out under varying loads and different input voltage variations. Compared with standard systems, the proposed system has an improved capacity to utilize different sources of power. © 2023 selection and editorial matter, Dharavath Kishan, Ramani Kannan, B Dastagiri Reddy and Prajof Prabhakaran; individual chapters, the contributors.Item Electric energy sources and storage device(Institution of Engineering and Technology, 2024) Kalpana, R.; Manjunath, K.; Chiliveri, V.R.; Kiran, R.[No abstract available]Item Renewable energy sources fed dual input full-bridge DC-DC converter for battery charging applications(Institute of Electrical and Electronics Engineers Inc., 2017) Kalpana, R.; Kiran, R.This paper proposes FPGA based dual input converter (DIC) for battery charging applications of 3 kW. The proposed system gives an alternative way of fusing the sources of DC in the magnetic form, instead of combining in the DC electrical form, by the addition of magnetic flux that is produced in the transformer magnetic core that works on the principle of flux additivity. A detailed design and the operation of the proposed dual input full-bridge DC-DC converter has been completely evaluated and presented in this paper. A constant frequency phase shifted PWM switching strategy has been preferred for the generation of gate pulses using FPGA controller board. The simulation analysis of the proposed converter has been executed utilizing MATLAB Simulink environment. A prototype of 1.5 kW has been developed and hardware results are presented to validate the theoretical waveform of the proposed dual input full-bridge DC-DC converter. © 2017 IEEE.Item Design and development of current source fed full-bridge DC-DC converter for (60V/50A)telecom power supply(Institute of Electrical and Electronics Engineers Inc., 2018) Kalpana, R.; Kiran, R.This paper addresses a dual input converter (DIC) for telecom power system of 3 kW using digital control algorithm. The proposed system gives an alternative way of fusing the sources of DC in magnetic form, instead of combining in the DC electrical form, by the addition of magnetic flux that is produced in the transformer magnetic core, which works on the principle of flux additivity. A detailed design, operation and control strategy of the proposed dual input isolated full-bridge step down DC-DC converter has been completely evaluated and presented in this paper. A constant frequency phase shifted PWM switching strategy have been preferred for the generation of gate pulses using FPGA controller board. The simulation analysis of the proposed converter has been executed utilizing MATLAB Simulink environment. A prototype for the proposed converter of 1.5 kW has been developed and experimental results are presented to validate the theoretical waveform of the proposed converter. © 2017 IEEE.Item Low Frequency Ripple Charging of Li-Ion Battery using Bidirectional Zeta DC-DC Converter to Improve Charge Transfer Efficiency(Institute of Electrical and Electronics Engineers Inc., 2018) Goud, J.S.; Kalpana, R.; Kiran, R.; Singh, B.Li-ion batteries are the most popular rechargeable batteries in applications like consumer electronics and electric vehicles in comparison with other rechargeable battery chemistries due to its high specific energy and longer life cycle. The reliability and life of the battery power devices depends on state of charge (SOC) and the charging protocol used for charging the battery. In this paper, low frequency ripple current (LFRC) charging of Li-Ion battery using the Zeta bi-directional DC-DC converter is presented. Charging the battery at the optimal frequency with ripple current results in improved charge transfer efficiency, improved charging time and thereby improves the life of the battery. To realize the LFRC charging technique, Zeta bidirectional converter and mathematical model of 48V, 4Ah Li-Ion battery is designed and simulated in MATLAB/ Simulink platform. Moreover, an experimental prototype is developed to validate the LFRC charging technique. © 2018 IEEE.Item Design and Development of Modular Dual-Input DC/DC Step Down Converter for Telecom Power Supply(Institute of Electrical and Electronics Engineers Inc., 2018) Kiran, R.; Kalpana, R.An isolated voltage source fed modular dual-input DC/DC converter with battery storage system for telecom load application is proposed in this paper. The proposed system has two individual inputs with rectifiers that are connected in parallel at secondary circuit for achieving constant voltage across the load. The proposed system integrates two energy sources resulting in an advantage of having compact structure with less number of components. Complete design of the proposed converter with FPGA based digital control strategy have been presented in this paper. The proposed control scheme aids in achieving stable current sharing of load current. Simple structure, current sharing of load and self-load regulation makes the converter configuration innovative for synchronized power management in dual-input telecom load application. The simulation analysis of the proposed converter has been executed utilizing MATLAB Simulink environment. A laboratory prototype has been developed and tested for 1.1 kW power. Simulation and hardware results validates the robustness of the proposed system under variable load as well as input voltage variation. © 2018 IEEE.Item Non-Isolated Multi-Port High Gain Interleaved Boost DC-DC Converter for Base Transceiver Station Application(Institute of Electrical and Electronics Engineers Inc., 2022) Smieee, K.R.; Smieee, S.P.P.; Fieee, B.S.; Kiran, R.; Ramya, A.S.This paper addresses a multi-port interleaved boost converter for base transceiver station (BTS) load with photovoltaic (PV) as a source and battery as backup energy storage device. The converter is designed to control the power flow from PV, battery and BTS load, and to regulate BTS load for 48V. In this paper, different modes of operations of converter are studied which depends on the availability of power from source and the battery. Further, steady state analysis and average state space equations of the proposed converter have been analysed. Furthermore, small signal modelling of the converter is carried out for the proposed converter. The MATLAB/SIMULINK based analysis has been carried out to verify the proper operation of the converter. © 2022 IEEEItem Design and Development of Modular Dual-Input DC-DC Step-Up Converter for Telecom Power Supply(Institute of Electrical and Electronics Engineers Inc., 2021) Kiran, R.; Kalpana, R.A modified modular dual-input dc-dc step-up converter along with a battery charging/discharging bidirectional converter that is suitable for telecom load applications is proposed in this article. The proposed converter has two individual input modules with the three-leg semiactive rectifier connected in parallel at secondary side for achieving constant voltage across the load with reduced circulating power. This results in an advantage of having compact structure with reduced number of components. The proposed converter works under a zero-voltage switching condition, it has favorable advantage such as low switching losses and high efficiency of the system. The complete design and steady-state analysis of the proposed converter utilizing field programmable gate array (FPGA)-based digital control strategy have been investigated in this article. A scaled down laboratory prototype of 1 kW has been developed and the robustness of the proposed converter is validated by extensive test results under variable input voltage and load conditions. © 1972-2012 IEEE.Item An Isolated Dual-Input Half-Bridge DC-DC Boost Converter with Reduced Circulating Power between Input Ports; Convertisseur boosteur DC-DC isolé à double entrée et demi-point avec une puissance de circulation réduite entre les ports d'entrée(2022) Kiran, R.; Kalpana, R.This article addresses a dual-input half-bridge DC-DC converter for proper utilization of renewable energy sources (RESs). The proposed system includes two different variable sources to examine the power distribution in each module, two high-frequency transformers (HFTs), and a three-leg converter (TLC) at secondary. The TLC is connected in parallel structure to gain reduced circulating power between input modules. This results in obtaining a compact design with a minimum number of switches. Complete steady-state analysis and control strategy of the proposed system have been analyzed. Digital closed-loop control has been implemented using the field programmable gate array (FPGA) controller to minimize the complexity of the control strategy. A laboratory prototype has been developed to justify the feasible operation of the proposed converter. Extensive tests result demonstrates the enhanced performance of the proposed system in effective utilization of power from different sources to feed the telecom load. © 2022 IEEE.Item 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.