Views: 6 Author: Site Editor Publish Time: 2022-12-07 Origin: Site
EMI ferrite core usage
Using ferrite core with line noise suppressors is an effective way to reduce the noise on power lines. Ferrites are magnetic materials that can be pressed into various（e diameter） shapes. They are used in the construction of EMI suppressors filters and common mode choke coils. Ferrites come in several forms, including ring-shaped, cylindrical hollow and plate-shaped, split clamps.
Typically, ferrites are made of metal-oxide ceramics that contain iron oxide(Fe₂O₃). These materials are highly permeable, and the permeability of the ceramic material supports the formation of a magnetic field when current flows through a conductor. The magnetic flux generated by the conductor is converted back into current energy by electromagnetic induction. In extreme cases, heat can be produced from the magnetic material, but it is usually only noticeable at low frequencies. In addition, the material has excellent insulation properties.
Typically, ferrite beads are used to suppress high frequency electronic noise in electronic circuits. They are primarily placed around the power-supply line and ground line pairs. They are also commonly used on external cabling and circuit boards. They work according to the principle of Faraday's Law, and they suppress high frequency signals in a narrow band. It is important to consider the frequency of the noise when selecting ferrite beads, as well as the heat dissipation that occurs. The number of loops used to create the desired impedance can affect the performance.
Depending on the application, ferrite cores may be used to attenuate any form of EMI emission. They can also be used for noise countermeasures in household appliances. They can be purchased in standard sizes, or customized for specific projects. They are also available in various materials, including Mn-Zn ferrite, which offers better lower-frequency characteristics.
A ferrite core line noise suppressor is made of a ferrite core, a magnetic material, and a conducting wire. The wire is wrapped around the ferrite core. The ferrite core is then enclosed in black plastic, which allows the conductor to be easily inserted. It snaps easily onto a cable, and is designed to reduce EMI on AC power lines.
Depending on the application, a ferrite core may be used to create a ferrite bead choke, a common mode choke coil, or an isolated high frequency circuit. The ferrite core is a metallic component that generates magnetic flux, absorbs high-frequency noise, and suppresses EMI emissions. It is also used to create a ferrite transformer. In addition, ferrite core wire can be used in building cables. The impedance of a ferrite bead, core or wire depends on the diameter of the conductor, the resistance of the conductor and the frequency. The impedance of the core or bead can be as low as 10-200 Ω at 25 MHz or as high as 50-300 O at 100 MHz.
Depending on the application, FERRITE CHOKES can be used to remove noise from a DC power supply or to eliminate interference from a household appliance. A ferrite bead can also be used to attenuate EMI on circuit boards.