Core loss behavior in high frequency high power transformers—II: Arbitrary excitation
Journal article, 2012

High frequency high power transformers used in power electronic converters are frequently subjected to non-sinusoidal excitations. The main purpose of this paper is to study the effects of some general arbitrary waveforms on magnetic core loss in these transformers. First, using well-known empirical equations, general expressions were derived based on the parameters of the waveforms. Second, the impacts of different orders of voltage harmonics were investigated. Finally, capabilities of nanocrystalline and amorphous magnetic materials were compared. It is shown that the loss inside the core is highly sensitive to the rise time and duty cycle of trapezoidal and rectangular waveforms, respectively. Furthermore, although amorphous materials have higher saturation flux density, the total core loss inside the transformer designed using nanocrystalline material is considerably lower than the similar transformer with amorphous materials.

power transformers

transformer cores

finite element analysis


E. Agheb

Norwegian University of Science and Technology (NTNU)

Amin Bahmani

Chalmers, Energy and Environment, Electric Power Engineering

H. K. Høidalen

Norwegian University of Science and Technology (NTNU)

Torbjörn Thiringer

Chalmers, Energy and Environment, Electric Power Engineering

Journal of Renewable and Sustainable Energy

1941-7012 (ISSN)

Vol. 4 3 033113-

Areas of Advance


Subject Categories

Other Electrical Engineering, Electronic Engineering, Information Engineering



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