A Highly-Efficient and Cost-Effective Reconfigurable IPT Topology for Constant-Current and Constant-Voltage Battery Charging

For a proper charging process in combination with inductive power transfer (IPT), the IPT topology has to meet the demand of both constant charging current (CC) or constant charging voltage (CV) for the battery within a wide range of loads that may be determined by the charging equipment. The proposed reconfigurable IPT topology can achieve load-independent CC and CV output by properly selecting an auxiliary capacitor and two single MOSFET switches without feedback control strategies or wireless communication links between the primary side and secondary side. The feasibility of the topology is verified by the output current and voltage stability of the prototype in CC/CV mode. During the whole charging process, the fluctuation amplitudes of charging current and charging voltage are both less than 2.4% with the overall system efficiency can maintain around 95%.