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A transient core loss calculation algorithm for soft magnetic composite material

In order to investigate the feasibility of dynamic loss minimization for DC-to-DC converters by control methods, transient core loss analysis for soft magnetic composite material is presented in this paper. A practical calculation model based on equivalent elliptical loop (EEL) model is developed to obtain the transient losses, and the algorithm is modified to adapt to non-sinusoidal waveforms by checking inflection points of the magnetic flux trajectory. With this model, time domain information of trajectories can be calculated automatically. And because of the simplicity of this model, it is easy to apply the calculation to finite element analysis. In experiments, a 200 Hz sinusoidal wave and also the 200 Hz wave combined with a single odd harmonic (3rd, 5th, ...49th) are applied to a ring core made of one-percent SiFe alloy powder and used to evaluate and document accuracy.