Optimization of Planar Inductor for Class-E2 Based WPT Systems

This paper optimizes the planar inductor used in Class-E
²
based wireless power transfer (WPT). Different constructions of the planar inductor will change parameters of inductor, such as core loss and copper loss. Four types of connection methods of the planar inductor are proposed and being analyzed to get the loss-minimum one. At the same time, a Litz-wire inductor is set as a control group. In the experiment, the Class-E
²
based on the WPT system with push-pull Class-E rectifier and inverter is set up and compares the performance of it with planar inductors and Litz-wire inductor mentioned before. By using the planar inductor with the proposed interleaved arrangement, the efficiency of the Class-E
²
based WPT system reaches 86.4% at the output of 48V, 203W.