Fractional Power Based Multi-Utility Fast Charger with V2Aux and V2V Capability

Abstract

A novel fractional power based multi-utility charger that enables high-efficiency fast charging, supplies EV auxiliaries (V2Aux mode), and can charge another EV (V2V mode) is proposed in this paper. During fast charging, the battery (load) is connected to the DC source such that only a part of power is processed through the converter, resulting in reduced current-voltage stresses, and higher efficiency. Further, when the charging source is disconnected, the battery appears as a source delivering power to the auxiliaries and the converter operates at semi-resonant frequency to meet auxiliary constant voltage demand. The same converter further enables V2V charging, by operating at resonant frequency to give constant current output. The flexibility of proposed charger to operate in all three modes without any additional component or complex control makes it a cost-effective solution. The converter operation and performance are discussed. The operation of converter is validated through a scaled down 650 W prototype. © 2024 IEEE.