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In this paper, an improved power quality converter derived from Cuk converter is proposed for the electric vehicle battery charging under universal-input voltage operation. The proposed converter offers high voltage gain, low voltage stress across the switch, lower conduction losses and reverse recovery losses during low input voltage condition. It yields improvement in efficiency at the low input supply voltage over the single-switch converters such as buck-boost, fly-back, SEPIC, and Cuk topologies and two-switch buck-boost cascaded converters. The proposed converter is designed to operate in a continuous conduction mode. The modeling and simulation of converter are carried out in the Simulink environment of MATLAB software. The developed simulink model is validated by a prototype model of same specification using Xilinx made Spartan3 processor under MATLAB environment in real time. To investigate the performance of the converter in terms of power quality indices like THD, input PF of source voltage and source current are evaluated under constant voltage and constant current modes of battery charging, for wide range of supply voltage variations. The performance of the converter is tested both in steady state and transient conditions.

This paper presents a concept of smart charging station using bidirectional half bridge converter for an electric vehicle. This battery charging station is useful for charging applications along with harmonics and reactive power compensation in a distribution system. A filter which is adaptive to the supply voltage frequency is used for the estimation of the 50 Hz component of load current. Due to additional features of vehicle charger, associated with the power quality improvement, there will be a drastic reduction in the current drawn from utility to meet the same load demand. The charging station presented in this paper is termed as smart with several function. The proposed smart charger is able to improve power quality of residential loads or other loads, not only during charging/discharging of the vehicle battery, but also in the absence of the vehicle. The Simulink model is developed with MATLAB software and its simulation results are presented. The level of current distortion during charging and and discharging mode is recorded 1.6 % and 2.4 % respectively with unity supply power factor during experiments. The performance of converter is evaluated during charging modes both in constant current (CC) and constant voltage (CV) modes.

Due to the growing demand for energy sets concern for the researchers to emphasize power generation through non-conventional sources because of their advantages over conventional source. This leads towards the intense research work carried out on fuel cells. Fuel cells have the ability of supplying electricity in the situation where the scope of conventional or other non-conventional power generating option is difficult to implement. The other advantages are transportability, flexibility, suitability and environment friendly operation. The particular advantage of transportability is well utilized in distributed power applications such as on board power supplies. This paper focuses on a low power converter energized by a fuel cell. It gives an overview of modelling of fuel cell and flyback converter with its different topologies that can be used in sensor application. Here different topologies of flyback converter are taken into consideration and out of these different topologies, the highest efficiency topology is chosen to supply power to the sensors and thereby its performance is tested. This converter is compared with the conventional method of supplying power to the sensor board and their performance is observed in terms of efficiency and other parameters. The simulation results are discussed and the performance is validated through experimental results.

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