A new core loss model for rectangular AC voltages

For most power converters, the voltage waveforms on the inductors or transformers are rectangular or composed of rectangular shapes. The waveform will have an impact on the value of the core loss. An accurate model is required in order to predict the core loss under such excitations and assist the design trade-offs. The most popular core loss models now are the modified Steinmetz equation (MSE), and the improved generalized Steinmetz equation (iGSE). However, the measurement data shows these models don't give accurate prediction under certain waveforms. A new model named rectangular extension of Steinmetz equation (RESE) is proposed to improve the accuracy for the core loss under rectangular AC voltages by employing a parameter γ, which is strongly related to material and frequency. Several ferrite materials are characterized and modeled with this new parameter for rectangular voltage excitation.

[1]  T. Durbaum,et al.  Calculating core losses in transformers for arbitrary magnetizing currents a comparison of different approaches , 1996, PESC Record. 27th Annual IEEE Power Electronics Specialists Conference.

[2]  John H. Harris,et al.  Testing Core Loss for Rectangular Waveforms February 7 , 2010 , 2010 .

[3]  A. Van den Bossche,et al.  Measurement and loss model of ferrites with non-sinusoidal waveforms , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[4]  Alfred Rufer,et al.  Global Loss Evaluation Methods for Nonsinusoidally Fed Medium-Frequency Power Transformers , 2009, IEEE Transactions on Industrial Electronics.

[5]  D.Y. Chen,et al.  High-frequency core loss characteristics of amorphous magnetic alloy , 1981, Proceedings of the IEEE.

[6]  D.Y. Chen,et al.  Comparisons of high frequency magnetic core losses under two different driving conditions: A sinusoidal voltage and a square-wave voltage , 1978, 1978 IEEE Power Electronics Specialists Conference.

[7]  D.M. Van de Sype,et al.  Ferrite Loss Measurement and Models in Half Bridge and Full Bridge Waveforms , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[8]  Fred C. Lee,et al.  New Core Loss Measurement Method for High-Frequency Magnetic Materials , 2010, IEEE Transactions on Power Electronics.

[9]  Charles R. Sullivan,et al.  Accurate prediction of ferrite core loss with nonsinusoidal waveforms using only Steinmetz parameters , 2002, 2002 IEEE Workshop on Computers in Power Electronics, 2002. Proceedings..

[10]  R. D. De Doncker,et al.  Calculation of losses in ferro- and ferrimagnetic materials based on the modified Steinmetz equation , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[11]  W. Shen.  Design of High-density Transformers for High-frequency High-power Converters , 2006 .

[12]  J. W. Kolar,et al.  Improved Core-Loss Calculation for Magnetic Components Employed in Power Electronic Systems , 2012, IEEE Transactions on Power Electronics.

[13]  Fred C. Lee,et al.  A high frequency core loss measurement method for arbitrary excitations , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[14]  C.R. Sullivan,et al.  Improved calculation of core loss with nonsinusoidal waveforms , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).