Design procedure for wireless power transfer system with inductive coupling-coil optimizations using PSO

Abstract

This paper presents a design procedure for wireless power transfer (WPT) systems based on the class-E2 dc-dc converter, taking into account inductive coupling-coil optimizations. The WPT system model is formulated as an equivalent circuit model by expressing the inductive coupled part as a transformer with low-coupling coefficient and equivalent resistances of primary and secondary coils. By using the circuit model, the dc-to-dc efficiency can be obtained analytically. The dc-to-dc efficiency, which is a cost function for optimization, is expressed as functions of physical parameters, such as coil size, wire type, and number of turns. The particle swarm optimization (PSO) is applied for reduction of the computational complexity compared with previous design method [1] and maximization of the cost function in this paper. Experimental results showed the validity and the usefulness of the proposed design procedure.