A Quick Review of Non-isolated Bidirectional Converters as EV Chargers

The dc to dc power conversion is becoming widespread in modern power and energy systems. In particular, the electric vehicle charging requires dc-dc power conversion as indispensable part of the system. Furthermore, the renewable energy integrated charging systems use dc-dc power converters to interface with the existing grid. On top of that, with the advent of high-power dc chargers, the charging efficiency is largely dependent on the performance of the power converters. This paper presents a brief topological review of the non-isolated dc-dc converters focusing on their merits and demerits as an effort to evaluate the circuits as EV chargers. A characteristic comparison of the topologies is also presented relating to efficiency, reliability, step up & step- down ratio, voltage range of operation, input current ripple and output voltage ripple based on simulation results.