Design and Implementation of Quasi Z-source Converter Based Battery Charger for Electric Vehicles

An electric vehicle consists of large rechargeable battery pack as main source of energy. Conventional iron core transformers based battery chargers makes the charger bulky and inefficient. Electric vehicle chargers must be light weight, efficient with high power density. In this paper, an electric vehicle charger for lithium ion batteries is designed and studied, which is suitable for light electric vehicles. The proposed charger comprises quasi Z- source fed phase shift full bridge converter. In this two stage dc-dc conversion, the quasi Z- source is implemented for power factor correction and to reduce harmonic distortion wherein, phase shift full bridge converter converts high DC voltage to lower one required to charge the battery with high efficiency. To analyse the charger performance, MATLAB simulation is carried out. The experimental result obtained from proposed charger has exhibited the charger efficiency of 90%, unity power factor and low (3.53%) harmonic distortion.