An Assessment of Coupled Inductor Modeling for a Multi-output Flyback Converter

In this paper, simulation results for a five-winding coupled inductor in a multi-output flyback converter are compared with experimental results. The simulations were usually aborted due to numerical convergence problems. This has been overcome by rearranging the elements of the equivalent circuit of the coupled inductor so as to place every inductance in series with a resistance. Discrepancies between the simulation and experiment have been categorized as follows: (i) coupling factors significantly influence the shapes of the secondary current waveforms and steepness of the slope after a switch transition; (ii) the representations of winding and core losses affect only the losses and not the shapes of the waveforms; (iii) the magnetizing inductance determines whether the converter operates in the continuous or discontinuous current mode

[1]  D. Jiles,et al.  Theory of ferromagnetic hysteresis (invited) , 1984 .

[2]  Jose A. Cobos,et al.  Axisymmetric modeling of 3D magnetic components , 1999, APEC '99. Fourteenth Annual Applied Power Electronics Conference and Exposition. 1999 Conference Proceedings (Cat. No.99CH36285).

[3]  Yo Sakaki,et al.  Physical meaning of equivalent loss resistance of magnetic cores , 1990 .

[4]  Robert W. Erickson,et al.  A comparison of the ladder and full-order magnetic models , 2001, 2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230).

[5]  J. D. Lavers,et al.  An accuracy assessment of 2-D vs. 3-D finite element models for ferrite core, sheet wound transformers , 2002, APEC. Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.02CH37335).

[6]  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..

[7]  Oscar Garcia,et al.  Model of the capacitive effects in magnetic components , 1995, Proceedings of PESC '95 - Power Electronics Specialist Conference.

[8]  D. Jiles,et al.  Theory of ferromagnetic hysteresis , 1986 .

[9]  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.