Abstract:
This paper presents a fast and accurate phase variable model of flyback switching converters.
A modified dynamic circuit model of high frequency transformer, capable of including the
effect of all types of core loss, is adopted. The dynamic differential inductances of the
transformer are obtained based on nonlinear finite element magnetic field analysis. The
developed phase variable model is implemented in Matlab/Simulink through variable
inductance and variable core loss equivalent resistance to account for the winding current and
voltage dependence. With this model, anomalous loss and natural output curve of flyback
switching converters are investigated. This model has been applied to analyze an existing
flyback converter and simulation results prove its practical merit and high effectiveness.
