Design and Optimization of a Post-Regulated Inductive Power Transfer System with a Series-Series Compensation

This paper discusses the design and optimization of a series-series compensated Inductive Power Transfer System (IPTS) followed by a post-regulator consisting in a DC-DC Buck converter. A static model of the system is developed through a first harmonic approximation method, and a procedure for compensation capacitor selection is proposed. A sensitivity analysis of the IPTS performances is carried out with respect to the variations of the primary inverter switching frequency and phase-shift angle, to achieve the efficiency maximization while ensuring the system controllability. Experimental prototype is developed able to deliver up to 29 W output power at a 12 V output voltage, yielding a 91.7% maximum efficiency. The IPTS behavior under both stable and unstable conditions is finally tested, thus confirming the static model predictions.