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Why magnetic ring inductance can resist electromagnetic interference, what is the principle?
Apr 30, 2017



Why magnetic ring inductance can resist electromagnetic interference, what is the principle?

Magnetic Ring Inductor.png


[Magnetic Ring Inductor] In the high frequency range, the impedance is mainly composed of resistance components. As the frequency increases, the magnetic permeability of the magnetic core decreases, resulting in a decrease in the inductance of the inductor and a decrease in the inductive reactance component, but this time The loss of the core increases, and the resistance component increases, resulting in an increase in the total impedance. When the high-frequency signal passes through the ferrite, the electromagnetic interference of the inductor is absorbed and converted into heat energy. In the low frequency range, the impedance is mainly composed of the inductive reactance of the inductor. At low frequencies, R is small, and the magnetic permeability of the magnetic core is high. Therefore, the inductance is large. The inductor L plays a major role and the electromagnetic interference is reflected and suppressed. When the core loss is small, the whole device is a low-loss, high-quality Q-inductance inductor. This type of inductor is likely to cause resonance. Therefore, in the low-frequency range, the phenomenon of interference enhancement using ferrite beads may occur.


The role of magnetic ring inductance


Inductance is mainly filtering, oscillation, delay, notch, image saying: "through the DC, blocking the exchange." The magnetic beads are mainly used to suppress electrical radiation interference, high-frequency noise and spike interference, and to absorb UHF signals. They are often used in PCBs, DC/DC modules, high-frequency switches, switch-type audio amplifiers, data lines, power lines, and signal lines. Wait. What is the difference between the inductor and magnetic beads?


 


1. The frequency characteristics of the magnetic ring inductor bead and the inductor are different. In the low frequency range, the inductance of the bead becomes larger, the resistance of the winding inductance becomes smaller, and the inductance of the bead functions, and it can be regarded as a low loss and high Q value. Inductors; In the high frequency range, the bead inductance becomes smaller and the resistance value becomes larger, resulting in an increase in total impedance, which can be regarded as a high-frequency blocking device.


 


2. The size of the magnetic ring inductor depends entirely on the frequency and strength of the interference wave to be absorbed. Based on the main parameters: the frequency at 100MHz impedance (unit is Ω), DC resistance (in mΩ) and rated current (in mA). Inductor selection will not be repeated here


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