Improved analytical modeling of conductive losses in gapped high-frequency inductors

An improved method to predict conductive losses in gapped high frequency inductors is presented and used for parametrization of an equivalent small signal circuit model. The method is based on the superposition of power losses resulting from the well known one-dimensional field calculation and losses due to eddy currents caused by the fringing field of airgaps determined from new analytical 2D-field calculations. Losses due to reactive currents in the windings caused by the self capacitance are also considered An accuracy improvement of at least 50% percent compared to the known methods is proved by measurements.

[1]  Werner Dietrich,et al.  Berechnung der Wirkverluste von Transformatorenwicklungen unter Berücksichtigung des tatsächlichen Streufeldverlaufes , 1961 .

[2]  Norbert Frohleke,et al.  Automated optimization of high frequency inductors , 1998, IECON '98. Proceedings of the 24th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.98CH36200).

[3]  P. L. Dowell,et al.  Effects of eddy currents in transformer windings , 1966 .

[4]  V. A. Niemela,et al.  Characterizing high-frequency effects in transformer windings-a guide to several significant articles , 1989, Proceedings, Fourth Annual IEEE Applied Power Electronics Conference and Exposition.

[5]  P. D. Evans,et al.  High frequency inductor design concepts , 1991, PESC '91 Record 22nd Annual IEEE Power Electronics Specialists Conference.

[6]  Marian K. Kazimierczuk,et al.  Minimum copper and core losses power inductor design , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[7]  Stephen D. Goad.  The theory and design of switched-mode power transformers for minimum conductor loss , 1985 .

[8]  Horst Grotstollen,et al.  Magnetic shielding applied to high-frequency inductors , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[9]  Jan Abraham Ferreira,et al.  Improved analytical modeling of conductive losses in magnetic components , 1994 .