Experimental verification of light electric vehicle charger multiport topology

This paper describes a multiport topology based charging station for light electric vehicles, like electric-motor assisted bicycles (pedelec). The multiport topology allows energy flow control between the charging ports, alternative energy ports and the grid port. Every port can act bidirectionally, enabling easy integration of additional energy storages. Power flow regulation in a wide range with the multiport topology is not preferred due to high losses at phase shifts that exceed 40 deg. The topology is well suited for battery charging, as the required charging voltage change will be less than 30%. To evaluate the multiport topology in the proposed application, a low power 250 W prototype charging station was designed, built and tested.