Electromagnetic and Temperature 3-D Fields for the Modular Transformers Heating Under High-Frequency Operation

Core losses in two different transformers under high-frequency (f=10 kHz) operation have been simulated using 3-D FEM modeling. For the first transformer, we assumed an amorphous core, while the ferrite core has been established for the second one. The equivalent electrical conductivity values have been assumed. The values of core losses were included into 3-D modeling of the temperature field. For both transformers, the temperature of the cores and windings was calculated versus the heating time. The calculation results have been compared with the ones from tests of our prototypes, and a good agreement has been obtained.