Introduction to C-shaped iron core

Introduction to C-shaped iron core

The origin of the C-type name: it is obtained from a ring-shaped iron core or a square-shaped iron core after ancient treatment, because it looks like a C when cut into two, so it is called C-shaped core.

However, there are two reasons for the C-type cutting. One is due to the need for performance. In theory, the C-type core has several advantages compared with the closed-loop core. First of all, the magnetic permeability is constant in a relatively large range, and this magnetic permeability can still be adjusted. But the closed-loop iron core can't do it, and the instability of magnetic permeability will greatly affect the performance. The second is that the magnetic induction intensity of the C-type iron core is close to 0, which can provide a higher B in some cases, such as single-ended flyback converters. More practically, the reason for this cutting is for the convenience of installation. For example, the diameter of the winding wire is relatively thick, or it is for the convenience of installing the wire bag. If it is one reason, the requirements for the smoothness of the end surface can be appropriately relaxed, and if it is the second reason, the requirements for the smoothness of the section are higher, and the section smoothness treatment needs to be performed after cutting. In any case, the improvement of the surface finish is beneficial to EMI (electromagnetic interference) control.

In terms of materials, the current C-type core materials include FeSi, Ferrite, powder core, and amorphous (1K101, 1K107), etc. The C-type iron core currently produced by our company is made of amorphous material. Because of the amorphous C-shaped iron core, the user feels that the design is compact, high-efficiency high-frequency power transformers and high-frequency choke coils are possible, and the noise is low. These contribute to a compact design, high efficiency and low noise power supply.