抗干扰磁环（Anti-interference magnetic ring）.doc

抗干扰磁环（Anti-interference magnetic ring） Why do you set up an anti interference magnetic ring? In the case of computer motherboard, power supply, CPU, and IDE data lines are working in high frequency state, resulting in case there is spatial stray electromagnetic interference signal and the signal strength is large, outside the case several times to several times! Shielding measures did not take the ring USB line in this space, the USB antenna line became good, receiving the high frequency signal clutter in the surrounding environment, and these signals superimposed on the signal transmission of the original, and even change the original signal transmission, prone to problems. In order to improve the transmission speed and stability, and also to reduce the interference of other devices, such as the sound card, the electrostatic shielding layer is designed to transmit the data. The shield is made of a thin metal foil or a thin copper wire woven into a mesh, using the surface effect principle of the electrostatic field. That is, the data transmission line on the surface of bread on a layer of metal film, and the shielding layer and the chassis to ground, you can very good data line and space interference signal isolation! Absorption ring, also known as ferrite, commonly used in the separation when removing the ring, it is anti interference components commonly used in electronic circuit, have a good inhibitory effect for high frequency noise, the general use of ferrite materials (Mn-Zn). The magnetic ring has different impedance characteristics at different frequencies, and the impedance is very small at low frequencies. When the signal frequency increases, the impedance of the magnetic ring rises dramatically. It is very good to pass the normal and useful signal, and also can restrain the passing of the high frequency interference signal very well, and the cost is low. Ferrite anti interference core characteristics EMC is developed in recent years new cheap interference