Finding possibilities of detailed and very accurate modeling of high frequency converter

Abstract

This paper deals with simulation model of the LLC resonant converter with frequency of 300kHz. The results of the simulation analysis are compared with results obtained from measurement on the real physical sample of proposed converter. The simulation model consists of three fundamental parts: rectangle impulses generator, resonant circuit with high-frequency transformer and the output rectifier. Coupling between the primary and secondary side is simulated using nonlinear model of magnetic core, which is done with use of Jiles-Atherton model. This model implements all of the important properties of real, nonlinear magnetic cores: first magnetizing curve, magnetizing saturation, coercitive field strength and the hysteresis loss. This is completed with the self-parasitic capacitance of the primary winding, secondary winding and capacitances between the turns.