Modulating functions for identification and modeling of ZVS class E2 resonant converters

Aim of the paper is to build mathematical models of class E² resonant DC/DC converters from input-output data. Among the various identification techniques, the modulating functions were chosen, due to their capability for revealing converter dynamics even in case of fast time constants. Each obtained model was tested around its working point: an accurate analysis was performed by varying both the number of pole-zeroes and the window width for identification. Extensive Spice simulations were run for an exhaustive and accurate evaluation of the models proposed. Preliminary results from experimental tests confirm the simulated ones. As a relevant conclusion, the modulating function method for identification and modelling reveals its effectiveness even in the critical case of resonant converters, where all traditional averaging techniques fail.