At an AC charging station, AC power in the grid is provided to this onboard charger, which converts it into DC power to recharge the battery. DC chargers provide higher power charging (which needs much larger AC-to-DC converters) by building the converter to the charging station rather than the vehicle https://cristianzwcfh.blogsidea.com/39294159/5-simple-techniques-for-cellphone-car-charger