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How does a ferrite inductor work at high frequencies?
Jul 14, 2017


How does a ferrite inductor work at high frequencies?


At low frequencies, the inductor generally exhibits an inductive characteristic, which only functions to store energy and filter high frequencies. However, at high frequencies, its impedance characteristics are very obvious. There are energy consumption and heat, and the inductive effect is reduced. The high frequency characteristics of different inductors are different. Explain the inductance of the ferrite material:


The ferrite material is a ferro-magnesium alloy or an iron-nickel alloy. This material has a high magnetic permeability, and it can be the smallest capacitance generated by the high-frequency high-resistance between the coil windings of the inductor. Ferrite materials are typically used at high frequencies because their main path inductance characteristics at low frequencies make the losses on the line small. At high frequencies, they mainly exhibit a reactance characteristic ratio and change with frequency. In practical applications, ferrite materials are used as high frequency attenuators for RF circuits. Moreover, the ferrite is preferably equivalent to the parallel connection of the resistor and the inductor. The resistor at low frequency is short-circuited by the inductor, and the impedance of the inductor at a high frequency becomes so high that the current passes through the resistor. Ferrite is a consuming device in which high-frequency energy is converted into thermal energy, which is determined by its electrical resistance characteristics.


Among the materials constituting the ferrite inductor, the MnZn ferrite has a high initial permeability at a low frequency of about several hundred to more than 2000, but its magnetic loss is large at a high frequency. Nickel-zinc ferrite, although its initial permeability is low, has a small magnetic loss at high frequencies and can operate at higher frequencies. People use MnZn ferrite to have a large magnetic loss at a high frequency, make it cylindrical and penetrate a wire in the center, thus making a ferrite inductor. When the AC signal passes through this ferrite inductor, the signal can be easily passed when the frequency is low. However, when the frequency is high, the magnetic loss of the ferrite is large, and the high-frequency signal is consumed by the magnetic loss of the ferrite when passing through the ferrite inductor, or is absorbed by the ferrite. This is the ferrite inductor. Suppress the working mechanism of high frequency signals. (magnetic ring inductance)

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