Self-sustained oscillation series-parallel resonant converter with the high frequency effects: analysis, modeling, and design

A more simple but accurate representation of the series-parallel resonant converter working under the self-sustained oscillation mode with the effect of transformer leakage inductance is presented. The detailed analysis allows the description of the steady state characteristics and the design optimization also enables the accurate derivation of the small signal model in order to predict the dynamic performance successfully. The averaged state space technique is employed to extract the small signal model together with the time domain analysis only used to calculate the boundary values. As a result, the analysis enjoys the simplicity of the state space averaging technique and the accuracy of the time domain analysis. Analytical and simulation results coincide with the outcomes of the experimental work to validate the superiority of the proposed work.