A Hybrid Topology Wireless Power Transfer System with Constant Current or Constant Voltage Output for Battery Charging Application

In this paper, a wireless power transfer system based on hybrid compensation topology for the battery charging application is presented. The power circuit is composed of LCL-LCL topology and LCL-LC/CL topology. The double-LCL topology provides load independent current output and LCL-LC/CL compensation topology provides load independent voltage output for the process of the battery charging. The operating frequency of the transmitter converter is kept constant during the whole charging process. In addition, the output voltage of the transmitter converter is a full square wave and the phase shift angle is always zero. The variation of the charging mode from the Constant Current (CC) to Constant Voltage (CV) is performed using a switch at the receiver side and without a communication path between the transmitter and receiver. The circuit analysis and design considerations are discussed in this paper. The simulation results shows good coherence with the theoretical analysis.