Set the cause of anti-jamming magnetic ring:

Motherboard, CPU in the computer chassis, power supplies, and IDE cables are working in high frequency mode, there is plenty of space in the chassis are therefore spurious electromagnetic interfering signal, signal strength is also outside of the chassis number to dozens of times! Absorb the magnetic ring, also known as ferrite rings, used for detachable detachable magnetic ring, it is commonly used in electronic circuit anti-interference components, very good inhibitory effect of high frequency noise, the general use of ferrite material (Mn-Zn). Anti-jamming magnetic ring at different frequencies have different impedance characteristics, generally in low frequency impedance is small, when the signal frequency was increased anti-jamming magnetic loop impedance rise sharply. Normal useful signals well through, and could well inhibit high-frequency interference signals through, and low cost.

Ferrite is a cubic lattice structure of ferrous magnetic materials. Ferrite materials for iron or iron-nickel alloys of magnesium alloy and its manufacturing process and mechanical properties similar to the ceramics, the color is grey and black. Electromagnetic interference filter often used in category is ferrite magnetic core materials, many manufacturers offer exclusively for EMI Suppression ferrite materials. This material is characterized by a very large loss at high frequency, with very high permeability, he is the inductance of the coil winding capacitance in the case of high frequency resistance between minimum. For electromagnetic interference suppression using ferrite, the most important performance parameter μ for magnetic permeability and saturation flux density Bs. Magnetic permeability μ can be expressed as a complex number, real part inductors, the imaginary part represents the loss increases as the frequency increases. Therefore, its equivalent circuit for l and r series circuit composed of l and r is a function of frequency. When when the wire through the ferrite core, composed of inductive impedance in form as the frequency increases, but the mechanism is totally different at different frequencies.

Inhibition of different ferrite components have different optimum suppression of frequency range. Usually higher the permeability, inhibition of lower frequencies. In addition, the larger volume of ferrite, inhibited the better. When the volume is constant, long, thin good inhibitory effect than short and thick, inner diameter less inhibiting effect is also possible. But in the case of AC or DC bias current, saturate the Ferrites problems still exist, inhibiting element cross-section larger, less saturated, more bias can be large.

Anti-jamming magnetic core anti-jamming magnetic loop | | magnetic ring magnetic flux