Modelling the power losses in the ferromagnetic materials

Abstract

In this paper, the problem of describing power losses in ferromagnetic materials is considered. The limitations of Steinmetz formula are shown and a new analytical description of losses in a considered material is proposed. The correctness of the developed description is demonstrated experimentally by comparing the results of calculation with the catalogue characteristics for different ferromagnetic materials.

Influence of Power Losses in the Inductor Core on Characteristics of Selected DC–DC Converters

“…The results given in Reference [20] showed that differences between values of power dissipated in the inductor core computed with the use of the models described in References [13,23] and the catalog data reached as high as 60%. In contrast, the results of computations performed with the use of the core model described in Reference [3] adequately fit the catalog data. In practice, this means that the use of classical models to describe power losses in the core, given in References [13,23] makes it impossible to obtain correctly computed values of power losses.…”

“…In practice, this means that the use of classical models to describe power losses in the core, given in References [13,23] makes it impossible to obtain correctly computed values of power losses. Differences between the values obtained with the authors' model given in Reference [3] and the considered literature models are largest at high values of temperature, frequency of the control signal, and input voltage [20]. In turn, the results given in Reference [12] showed that, in order to compute power losses of the inductor core included in the boost converter, it is essential to take into account the shape of the waveform of magnetic flux density and the influence of temperature and frequency on the properties of magnetic materials.…”

“…In addition, the use of the classical Steinmetz model [23] to compute power losses in magnetic materials is justified in the range of low frequency not exceeding 25 kHz [12]. For frequency values higher than 25 kHz, power losses in the magnetic material per unit volume increase by up to 15% [3,12].…”

“…Direct current (DC)-DC converters, which are used, e.g., in switch mode power supplies and semiconductor devices, also contain magnetic elements used to store electrical energy [1]. In recent years, more and more papers focused on modeling power losses in magnetic elements and on examining the influence of power losses in these elements on the characteristics of electronic equipment [1][2][3][4][5][6][7][8][9][10][11][12].…”

“…Reference [12] presented a method of modeling power losses in the core of the inductor, which is a component of the boost converter. The results of computations using the various models described, among others [13,16,17,19], were compared to the results obtained using the authors' model given in Reference [3], which took into account the influence of temperature, frequency, and the shape of magnetic flux density on the properties of magnetic materials and power losses in the ferromagnetic core of an inductor.…”