Magnetic Ring Ferrite Core 40*24*16 Anti-interference Filter Winding Inductance Spray Green | Обустройство дома

Magnetic Ring Ferrite Core 40*24*16 Anti-interference Filter Winding Inductance Spray Green | Обустройство дома

Name：Ferrite ring

external diameter：40.0mminternal diameter：24.0mmheight：16.0mm

colour：green（Spraying insulating paint）

Company：individual

Remarks：The existing products are circular magnetic rings

Commodity type：Non magnet、Non ferromagnetic

Magnetic ring is also called ferrite magnetic ring，It is a common anti-interference component in electronic circuits，It has a good restraining effect on high frequency noise，Ferrite materials are generally used（Mn－Zn）Make。

Magnetic rings have different impedance characteristics at different frequencies，Generally, the impedance is very small at low frequency，When the signal frequency increases, the impedance of the magnetic ring increases sharply。

As you all know，Higher signal frequency，The easier it is to radiate（To buy high-quality computer case is also to reduce electromagnetic leakage），But the general signal line has no shielding layer，So these signal lines become veryGood antenna，Receive all kinds of high frequency signals in the surrounding environment，And these signals are superimposed on the original transmission signals，It will even change the original transmission of useful signals。So under the action of magnetic ring，Make normal and useful signals pass well，It can also restrain the passing of high-frequency interference signals，And it's cheap。

So we're on the display signal line，USBConnecting line，Even high-end keyboard、It's no surprise that the mouse looks like a plastic one-piece magnetic ring。

Selection of turns of magnetic ring

A common mode choke is formed by passing the whole cable through a ferrite magnetic ring，According to need，The cable can also be wound on the magnetic ring for several turns。The more turns there are.，The lower the frequency, the better the interference suppression effect，However, the noise with higher frequency is less restrained。In the actual project，The number of turns of the magnetic ring should be adjusted according to the frequency characteristics of the interference current。Usually when the frequency band of interference signal is wide，Two magnetic rings can be sleeved on the cable，Different turns of each magnetic ring，This can suppress both high-frequency interference and low-frequency interference。From the mechanism of common mode choke，The greater the impedance，The more obvious the interference suppression effect is。The impedance of the common mode choke comes from the common mode inductanceLcm=jwLcm，It's not hard to see from the formula，For a certain frequency of noise，The larger the inductance of the magnetic ring, the better。But this is not the case，Because there is parasitic capacitance on the actual magnetic ring，It exists in parallel with the inductance。When encountering high frequency interference signal，Capacitance reactance is small，Short circuit the inductance of the magnetic ring，Thus, the common mode choke will lose its function。

Reminder

One、Rings are sold by size，Companymm(millimeter），tolerance+、-0.5mmBetween。

Two、Dimensions according to product description on page，Don't just imagine buying，If you don't know, please consult customer service。

Three、The magnetic ring is fragile，Be careful when using，If you have any questions, please contact us。