Abstract
In this paper, a new thermal model of the inductor is proposed. This model takes into account self-heating in the core and in the winding, and mutual thermal couplings between the mentioned components of the inductor. The form of the elaborated thermal model is presented. In this model, the influence of power dissipated in the core and in the winding of the inductor on the efficiency of heat removal is taken into account. Correctness of the model is verified experimentally for inductors containing ferrite cores of different shapes and dimensions. The good agreement between the results of calculations and measurements is obtained. On the basis of the obtained findings, the influence of volume and the shape of the core on thermal resistances and thermal capacitances occurring in this model is discussed.
Highlights
Inductors are important components of switch-mode power converters
The aim of this paper is to examine influence of the size and the shape of the ferromagnetic core and power losses on parameters of a thermal model of the inductor
A compact nonlinear thermal model of the inductor was proposed. This model makes it possible to calculate values of temperature of the core and the winding of the inductor taking into account occurrence of self-heating in every mentioned component of the inductor and mutual thermal couplings between the core and the winding
Summary
Inductors are important components of switch-mode power converters. These components are used to store electrical energy [1,2,3,4,5]. Properties of these components depend on physical phenomena occurring in the winding and in the ferromagnetic core contained in the inductor [1,6,7,8,9,10]. The most frequently used material to construct inductor cores are ferrites produced as a result of dwighting powdered metal oxides. Ferrites are characterised by high hardness, high resistivity, and low losses of eddy currents [5,9,10,11,12,13,14]
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