Improved LCL Resonant Network for Inductive Power Transfer System

Due to the constant resonant current and robust characteristic, the LCL resonant topology is widely used in the Inductive Power Transfer (IPT) system. The paper proposes an improved LCL resonant network utilizing a coupling structure between the resonant inductors in the T type network. A series of improved topologies are proposed and compared. A parameter design method is also proposed. This coupling structure will provide more freedom for adjusting the LCL network configuration either in the design stage or in the actual operation. Furthermore, it is helpful to reduce the high order harmonic components and switching losses. Experimental results verify the performance of the improved LCL network.