An efficient approach for the numerical identification of R, L parameters of high frequency multiwinding transformers

In this paper, we derive equivalent circuits for high frequency multiwinding magnetic components from finite element (FE) computations. Lumped parameter models are first presented, based on previously published work. All parameters of these circuits can be interpreted as the results of open and short-circuit tests on the transformer. Based on this consideration, numerical procedures are then proposed to derive frequency-dependent lumped parameters from FE simulations. By using an adequate formulation, parameters are directly obtained from the FE model degrees of freedom, without performing any volume integration in post-processing, which can be source of numerical errors. In this contribution, attention is paid on the modeling of magnetic coupling using inductances, and dissipative effects (winding and core losses) using resistances. An analysis of the impact conductor eddy currents may have on the circuit parameters is moreover carried through.