Most applications of iron powder cores are substitutions of inductors made of ferrite cores. These applications include DC/DC converter output filter inductors and power factor correction inductors. In these applications you need the energy storage capability (proportional to $ B times H $; all quantities are magnitudes) of the inductor core. Ferrite cores have a high permeability so you need to introduce an air gap to reduce this permeability, thus increasing the magnetic field $H $ strength needed to magnetize the core to a flux density $ B $.

This air gap has a severe disadvantage: within the air gap the relative permeability is reduced to unity and this causes the flux to exit the core and enter the winding, leading to eddy current losses in the winding. The power loss density is concentrated around the air gap, so there is the risk of a hot spot. Iron powder cores do not need the additional air gap since it is integrated into the material and, in consequence, spread within the complete core volume.

Www.mag-inc.com CONTENTS GENERAL INFORMATION 1-1 Introduction 1-2 Applications 1-3 Core Identification 1-4 General Powder Core Information CORE. Transformers and inductors for SMPS power supplies: design principles, operation theory, flux density equations for various waveforms. Free design software. Ferrites are made from a powder and can therefore the ferrite cores used in inductors and other applications can be manufactured in a variety of shapes according to the requirements. Soft ferrites also have a high electrical resistance and therefore, when used in inductors and transformers eddy current losses are also low.

Jun 17, 2013. Keywords: 2D Finite Element Analysis; soft ferrite cores; nonlinear inductors. Ferrites are of great interest for power electronics due to their low power losses [1,2] and they form an essential part of inductors and transformers used in their main applications areas [3–5]. Therefore, it.

This reduces the eddy current losses in the winding and the remaining eddy current losses are distributed throughout the winding length. Furthermore, energy storage is limited by the saturation flux density. In ferrite this saturation flux density is about 400 mT and decreases with temperature. In iron powder cores saturation flux densities of more than 1 T can be utilized, depending on the material. As you mentioned Micrometals core: Micrometals, Inc. Offers an that can be used to design basic inductors including power loss calculations.

Phase I: Electricity Phase V: Advanced Phase V: Advanced: Continued. (1) (2) Phase II: Components: (3) (4) (5) (6) (7) Phase III: Workshop (8) (9) (10) (11) Phase IV: Active Ckts.

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