One is for the coil to simply increase the magnetic induction

1. One is for the coil to simply increase the magnetic induction. Since the material is a ferromagnetic material, the magnetic permeability is high, which can significantly increase the magnetic flux in the coil.

 

2. Another kind of magnetic ring is a commonly used anti-interference component in electronic circuits, which has a good inhibitory effect on high frequency noise. Such magnetic rings have different impedance characteristics at different frequencies, and generally have a low impedance at low frequencies, and the impedance of the magnetic ring rises sharply as the signal frequency increases. Everyone knows that the higher the signal frequency, the easier it is to radiate out (to buy a high-quality computer case is also to reduce electromagnetic leakage), and the general signal lines are not shielded, then these signal lines become a good antenna , receiving various messy high-frequency signals in the surrounding environment, and these signals are superimposed on the originally transmitted signals, and even change the useful signals originally transmitted. Then, under the action of the magnetic ring, the normally useful signal can pass well, and the high-frequency interference signal can be well suppressed, and the cost is low. Therefore, it is not surprising that everyone is looking at the plastic ring type integrated magnetic ring on the display signal line, USB cable, and even the high-end keyboard and mouse.

 

3. Magnetic core: A ferromagnetic material with a high magnetic permeability, which can significantly enhance the magnetic induction of the inductor and increase the magnetic flux density (magnetic flux) of the magnetic circuit of the electromagnetic coil. Ferrite cores are used in coils and transformers of various electronic devices to enhance magnetic induction or to improve power conversion efficiency.