On Board Chargers in ev Applications using Buck-Boost Converters

This article suggested a two stage battery charger with interleaved bridgeless buck-boost based power factor correction (PFC) AC-DC converter at the stage one. The converter front end enhances power factor by the input current shaping with the dc line voltage. The back end provides the battery charged via a half bridge LLC Converter. This on-board charger(OBC) achieves a power factor of almost unity throughout the wide variety of input voltages.additionally,input current and for AC-DC conversion, voltage sensors are not necessary because of the conduction mode of discontinuous inductor current(DICM),further lowering the total coast and improving the converters dependability. Most low voltage(LV) systems are practically compatibility with OBC approach charges for batteries .the design formulas and comprehensive steady-state additionally, an examination of the suggested charger is provided. Lastly the validity is shown by simulation and hardware for this OBC, of a 1KW laboratory prototype yields an peak efficiency and input current THD as low.