Non-linear thermal model of planar transformers

In the paper the non-linear thermal model of the planar transformer is proposed. The form of the worked out model is presented. This model makes possible calculation of waveforms of temperatures of the core and every winding when the power of the well-known waveforms is dissipated in them. The usefulness of the model is verified experimentally for the selected planar transformer, and the obtained results of calculations are compared with the results of calculations performed with the use of the linear model and with the results of measurements.