Model derivation and dynamic analysis of the SPS compensated wireless power transfer system

The dynamic model of the series-parallel-series (SPS) compensated resonant inductive power transfer (IPT) system is derived. It has been shown that the aforementioned compensation is suitable for electric vehicles (EV) on-road charging due to its high-misalignment tolerance between coils. This work does not restrict its analysis to small signals, i.e., linear approximations of functions. Furthermore, the final expressions can be easily adapted to the series-series (SS) and parallel-series (PS) configurations, for these are particular cases of the SPS compensation. Experimental tests on a 500 W prototype validate the proposed equations.