The Characteristics and Application of Iron Powder Core

The iron powder core is a soft magnetic material made of ferromagnetic powder and insulating medium mixed and pressed. Because the ferromagnetic particles are very small (0.5-5 microns used at high frequencies) and are separated by non-magnetic electrical insulating film materials, on the one hand, the eddy current can be isolated, and the material is suitable for higher frequencies; on the other hand, due to the particles The gap effect between the materials causes the material to have low magnetic permeability and constant magnetic permeability; and because of the small particle size, skin phenomenon basically does not occur, and the magnetic permeability changes with frequency more stable. Mainly used for high frequency inductors. The magnetoelectric properties of the iron powder core mainly depend on the permeability of the powder material, the size and shape of the powder particles, their filling factor, the content of the insulating medium, the forming pressure and the heat treatment process.

The ability of EMI absorption magnetic ring/magnetic bead to absorb interference is characterized by its impedance characteristics. It presents a very low inductive impedance value in the low frequency band, and does not affect the transmission of useful signals on the data line or signal line. In the high frequency band, starting at about 10MHz, the impedance increases, its inductive reactance component remains small, but the resistive component increases rapidly, and the high frequency EMI interference energy is absorbed and dissipated in the form of heat energy.

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