Key EMI countermeasure component settings
date：2018-11-07 11:13:00
Key EMI countermeasure component settings
In terms of Ferrite Beads, the magnetic beads themselves have high resistivity and magnetic permeability, which can be equivalent to the series connection of resistance and inductance, but the actual resistance and inductance of Ferrite Beads will be generated with frequency. Changes, because Ferrite Beads has better high frequency filtering characteristics than general inductors. Ferrite Beads itself is a ferrite cubic lattice ferrimagnetic material, ferrite material can be iron-nickel alloy or iron-magnesium alloy, because this material has high frequency loss and high magnetic The conductivity is very useful for the design of electromagnetic interference prevention and control.
Ferrite material properties can also be used to improve the EMI problem of the board. Generally speaking, in the low frequency range, the impedance of the Ferrite Beads is composed of the impedance of the inductor. The resistance value of the low frequency state is quite low, and the magnetic core itself is magnetic. The conductivity is high, the inductance is large, and the electromagnetic interference is affected by the inductance response. In terms of high-frequency use segments, the impedance of Ferrite Beads is represented by the resistance characteristics. As the external frequency increases and the magnetic permeability of the core decreases, this causes the inductance of the Ferrite Beads to decrease, but at this time, the core loss will Increase (increased resistance), when the high-frequency signal is absorbed by the ferrite electromagnetic interference, it will be absorbed and converted into heat energy to escape energy.
As for Ferrite Beads ferrite suppression components can be widely used in PCB printed circuit boards, data lines, power lines, for example, by adding Ferrite Beads ferrite suppression components at the input end of the PCB circuit board power line, you can effectively filter out The high frequency interference of the block circuit, the ferrite magnetic ring and the magnetic beads can also be used to suppress the high frequency interference/surge interference of the signal line and the power line, and at the same time have the ability to absorb the electrostatic discharge pulse.
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