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Introduction to Ferrite Core

2024-11-09

The ferrite core is mainly composed of iron (Fe), manganese (Mn), and zinc (Zn) three metal elements, commonly known as Manganese zinc ferrite. Toroidal ferrite core because there is no air gap, and the cross-sectional area is consistent, so the magnetic effect is very high. Ferrite magnetic rings have a lot of specifications and sizes, depending on the material of the magnetic ring, can be selected, and different coatings can be used to simplify winding and improve breakdown voltage.

Introduction

Ferrite magnetic rings have a lot of specifications and sizes, depending on the material of the magnetic ring, can be selected, and different coatings can be used to simplify winding and improve breakdown voltage.

Ferrite cores are made of dense and homogeneous ceramic structure of non-metallic magnetic materials, low coercivity, also known as soft ferrite. It consists of oxide or carbonate compounds of iron oxide (Fe2O3) and one or several other metals (such as manganese, zinc, nickel, magnesium). Ferrite raw materials by pressing, after 1300 degrees C high temperature sintering, and finally by machine processing to meet the application requirements of the finished core, compared to other types of magnetic materials, ferrite has the advantage of high permeability, and in a wide range of frequency range with high resistance and eddy current loss and other advantages. These material properties make ferrite ideal for applications such as high-frequency transformers, broadband transformers, tunable inductors, and other high-frequency circuits from 10kHz to 50MHz.

2 Use

Coils wound on ferrite cores can be made into inductors or transformers, which are widely used in instrumentation, communication equipment and household appliances. Ferrite cores have many material grades and various geometric shapes, including cylindrical, I-shaped, hat-shaped, single-hole, double-hole, four-hole, U-shaped, can-shaped, E-shaped, EI-shaped, EC-shaped, RM-shaped, PQ-shaped and EP-shaped, as shown in the attached figure. Each shape of the core into a series, for the user to choose. The choice of ferrite core is very wide, according to different magnetic parameters, to choose different materials and shapes due to the low magnetic loss at high frequency, they are widely used in switch mode power supply (SMPS), radio frequency (RF) transformer and inductor. Ferrite cores of various shapes and sizes are used in high-frequency power and high-quality communications markets such as inductors, pulse transformers, high-frequency transformers, and noise filters. Ferrite is characterized by high permeability, good temperature characteristics, and low attenuation rate.

3 Specific data

An inductor formed by winding a coil around a ferrite core has a large inductance and a high Q value (quality factor) as compared with an air core coil of the same volume. For example, Gu - 22 × 13 can-shaped magnetic core, when it is used to make a 4mH inductor, only 43 turns of coil are required. If the can-shaped magnetic core is not used and the coil is changed to an air core, 600 turns of coil are required to make a 4mH inductor. It can be seen that after using the magnetic core, the volume of the inductor or transformer can be greatly reduced.

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