Abstract
This article presents the modified Preisach model of hysteresis for a 3-phase medium frequency transformer in a 100 kW dual active bridge converter. The transformer magnetic core is assembled out of ferrite I-cores, which results in multiple parasitic air gaps. For this transformer, the hysteresis loops were measured and parameters of the Preisach model were determined. The Preisach distribution function is approximated with a two-dimensional Gauss function series and the feedback function is a 3rd-degree polynomial. The optimized identification of Preisach distribution function parameters was prepared. Two sets of parameters were determined based on the analysis of major and minor hysteresis loop. The developed model is used to analyze the transformer core power loss. A new set of Steinmetz equation parameters for multi air gap ferrite core MFT is proposed.
Highlights
THE medium frequency transformer (MFT) is one of the key components of the isolated dc-dc converters
The Preisach distribution function is approximated with a two-dimensional Gauss function series and the feedback function is a 3rd-degree polynomial
The modified Preisach model of hysteresis accurately represents magnetic hysteresis loops in the multi air gap medium frequency transformers composed of type “I” ferrite cores
Summary
THE medium frequency transformer (MFT) is one of the key components of the isolated dc-dc converters. The precise MFT design and modeling should consider a time-dependent model of the magnetic hysteresis. The Jiles-Atherton model is based on the magnetization reversible and irreversible components. It can be used in the analysis of hysteresis phenomena in several physical domains [37]–[39]. The feedback Preisach model (FPM) allows removing the congruency property. This PM modification has been selected and it is further developed in this article. In [50], [51] the Preisach model was implemented in a circuit simulation of an isolated dc-dc converter with a single-phase transformer
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