The magnetic ring is a circular magnet. Magnetic ring is a commonly used anti-interference element in electronic circuits, which has a good suppression effect on high-frequency noise.
It is a commonly used anti-interference element in electronic circuits and has a good suppression effect on high-frequency noise. It is generally made of ferrite material (Mn-Zn). The magnetic ring has different impedance characteristics at different frequencies. Generally, the impedance is very small at low frequencies. When the signal frequency increases, the impedance of the magnetic ring increases sharply. As we all know, the higher the signal frequency is, the easier it is to radiate (to buy a high-quality computer case is also to reduce electromagnetic leakage), and the general signal lines are not shielded, so these signal lines become a good antenna to receive all kinds of messy high-frequency signals in the surrounding environment, and these signals superimposed on the original transmission signals will even change the original transmission of useful signals. Then under the action of magnetic ring, the normal and useful signals can pass well, and the high-frequency interference signals can be well suppressed, and the cost is low. So it is not surprising that you can see the plastic lump-shaped integrated magnetic ring on the display signal line, USB connection line, and even high-end keyboard and mouse.