Physics-Based Equivalent Circuit for Coupled Windings with Significant Fringing
The equivalent circuit is shown in Fig. 1 with two winding resistors and two core loss resistors on each side. Rwp and Rws model the winding loss from coupling even if no net current is going through the winding. The core loss resistors are determined by core-loss calculation sub-circuit that dynamically predicts the core loss in the time domain.
Compared to the conventional equivalent circuit for coupled windings, the model herein is capable of predicting the winding loss when the phase shift between the primary and secondary currents is swept from 0 to 360 degrees.