A New Modelling Technique for Inductive Power Transfer (IPT) Systems

Loosely coupled IPT systems generally employ compensation networks to reduce reactive power drawn from the supply. Various compensation strategies exist, including four fundamental types with differing characteristics. These must be analyzed and evaluated during IPT system design stages to allow for the best selection according to the IPT application. For this purpose, existing approaches are inelegant and cumbersome. Therefore, a new modelling technique is proposed that allows each of the four fundamental forms of IPT compensation to be analyzed through the very simple manipulation of key circuit parameters. The proposed technique is verified through comparison to IPT system circuit simulation results in the time domain. Its utility is demonstrated through its ability to give IPT system sensitivity analysis under a range of coupling conditions and voltage ratio conditions.