Abstract:
This paper presents a generalized dynamic model for flyback
switching AC-DC converters. Comparing with the current
model in the published literatures, several important factors are
taken into account, including the anomalous loss in magnetic
cores, differential inductance and leakage inductance. In order
to obtain accurate parameters, nonlinear finite element analysis
method is used to calculate some key parameters of transformer:
differential inductance and leakage inductance. Furthermore, a
modified flyback transformer model is built. The systematic
method to build the hybrid model - system switching state based
on time sequence is also introduced. A simulation model in
MATLAB/Simulink, in which all three operational modes are
included, is built. The developed model is validated by
executing the model on an existing converter, and several
performances are obtained.
