Design and Analysis of off-board PV-Grid Adjustable Charger for Electric Vehicle Battery

The electric vehicles (EVs) are emerging as general-purpose transportation, due to various shortcomings of traditional vehicles. The EVs will become ubiquitous only if its charging infrastructure is abundant and efficient. Typically, a module of Li-ion battery applied in EVs uses 4 – 6 cells. These modules are connected in series-parallel combination to obtain the threshold power output. The power for the charging battery is delivered by the PV – grid topology. The solar and grid circuit uses a boost converter to create a dc bus. As the system uses boost converter for both PV and grid circuit, therefore, charging profile can be adjusted by altering dc bus voltage. The battery used in different EVs has a different configuration. The charger for EVs should be adjustable, as the traditional charger with fixed output will not charge the battery efficiently and results in reduced battery life. Therefore, a charger providing a fixed output will not serve the public demand. Hence, an adjustable charger has been proposed in this paper. The voltage and current profile of the charger can be adjusted according to the requirements of the EV battery.