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Paper deals with investigation of two problems: frequency step changes, and step switching-off of the load of LCTLC resonant inverter. Since the changes of frequency in the range from fmin to fmax are desirable to be the input current of the LCTLC circuit not greater than nominal one, the load changes cause dangerous overvoltage spikes. Modelling, theoretical analysis and computer simulation are used for the solution of those phenomena. Simulation experiment results confirming theoretical assumptions are given in the paper. Keywords-dynamical state-space model; modelling and simulation; resonant converter; LCTLC inverter; voltage transfer characteri-stic; steady-state operation; transient phenomena.

Modelling of Dynamical Properties of a Resonant Converter under Step Frequence- and Loaded Converter Changes