Unified flyback switching-cell model including the leakage inductance effects for SPICE simulation

Abstract

A unified behavioral model based on the flyback transformer, including its leakage inductance, is presented in this paper. The proposed switched transformer model is applicable to simulate topology-independent converters under both continuous (CCM) and discontinuous (DCM) conduction modes. The model can be used in modeling more complicated converter topologies with nonidealities, such as leakage inductance and snubber networks. Simulation results using the proposed model show the over-looked effect of the transformer leakage inductance on the high frequency transfer function response of the flyback converter. The time domain simulation results show a good accuracy and significant reduction in the simulation time.