A Hybrid Compensation Topology with Constant Voltage and Constant Current for EV Bidirectional Wireless Charging

A constant current (CC) and constant voltage (CV) charging topology applied to the bidirectional wireless power transfer system for electric vehicles (EVs) is presented in this paper. It only needs to adjust the switching state of a relay to realize the CC output of inductor-capacitor-capacitor - inductor-capacitor-capacitor (LCC-LCC) and CV output of inductor-capacitor-capacitor-series (LCC-S) and series- inductor-capacitor-capacitor (S-LCC). Compared with the other topologies, redundant components are not required, and the switching frequency is fixed under the operating process. Under the misalignment condition, the CC and CV output can be regulated by applying the phase-shift control. The proposed reconfigurable topology can realize bidirectional CC and CV charging without communication between primary and secondary side. A 6-KW prototype is built in the laboratory to verify the effectiveness of the topology, and the maximum effective is 94%.