LCL/CLC Resonant Rectifier-Based Inductive Power Transfer Systems With Integrated Coil Structure and Inherent CC and CV Battery-Charging Profile

Inductive power transfer (IPT) systems with inherent constant current (CC) and constant voltage (CV) battery-charging profiles have the merits of not requiring wireless communication, detection circuits, and control circuits. However, existing IPT systems with inherent CC and CV battery-charging profiles require a large number of components or suffer from backflow current, thereby resulting in a bulky and inefficient system. To solve such problems, this article proposes LCL/CLC resonant rectifier-based IPT systems with inherent CC and CV battery-charging profiles. The backflow current is eliminated in the proposed rectifiers. A unified analysis method is proposed to analyze LCL/CLC resonant rectifier-based IPT systems. Two LCL/CLC resonant rectifier-based IPT systems with minimum component counts are derived, which maintain near zero phase angle (ZPA) and zero voltage switching (ZVS) operation. The voltage–ampere rating and switching loss are reduced. Two inductors of the LCL network are integrated into the loosely coupled transformer to make the system more compact and to reduce the corresponding cost and volume. There is no compensation inductor or extra rectifier on the receiver side. As a result, the required installation space for the charging equipment can be reduced. A prototype of the LCL resonant rectifier-based IPT system is implemented to validate the analysis. The maximum efficiency of 92.43% is achieved.