Comparing different approaches for the numerical identification of R, L parameters of HF multi-winding transformers

In this paper, mathematically rigorous R, L circuits of high frequency multi-winding transformers are numerically extracted. Two procedures based on the Finite Element Method (FEM) are investigated. In the first one, a Cholesky decomposition is applied to the resistance and inductance matrices of the device, which are obtained using a FE model. The second approach employs the FEM as a virtual laboratory in order to perform numerically open and short-circuit tests on the transformer. The two methods are compared regarding the overall computational burden and the obtained lumped parameters, for 2D and 3D models.