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Characteristics and installation techniques of ferrite magnetic ring inductors
Jul 05, 2018

Characteristics and installation techniques of ferrite magnetic ring inductors

Ferrite anti-interference magnetic core is a popular and inexpensive interference suppression device in recent years. However, the same suppression element, the installation position is different, the suppression effect will be very different, then the ferrite magnetic ring inductance What are the skills of the installation?

  To understand the installation of ferrite magnetic loop inductors, the first thing to understand is the ferrite anti-interference core characteristics. Its function is equivalent to a low-pass filter, which better solves the problem of high-frequency interference suppression of power lines, signal lines and connectors, and has a series of advantages such as simple use, convenience, efficiency, and small space occupation. The body anti-jamming magnetic core to suppress electromagnetic interference (EMI) is an economical simple and effective method, and has been widely used in various military or civilian electronic devices such as computers.

coil filter common mode choke.jpg

  Ferrite is a kind of high-magnetic material that is infiltrated with other metal or magnesium, zinc, nickel and other metals at 2000 °C. In the low frequency range, the ferrite anti-interference core exhibits very low sensitivity. The impedance value does not affect the transmission of useful signals on the data line or signal line. In the high frequency band, starting from about 10MHz, the impedance increases, the inductive component remains small, and the resistive component increases rapidly. When high-frequency energy passes through the magnetic material, the resistive component converts these energies. Dissipated for heat energy consumption. This constitutes a low-pass filter that allows large attenuation of the high-frequency noise signal, while the impedance of the low-frequency useful signal is negligible and does not affect the normal operation of the circuit.

  Understand the characteristics, let us look at the installation of ferrite suppression components, generally installed in the I / O port interface, using a heat shrink tube to tighten the line.

  1. When suppressing high-frequency interference, nickel-zinc ferrite should be used; the frequency is 1MHZ-300MHZ, and the resistance of nickel-zinc ferrite is very large.

  2. When suppressing low-frequency interference, Mn-Zn ferrite should be used; the frequency is 1KHZ-10MHZ, and the resistance is below 150kΩ.

  3. Known magnetic cores can measure the amount of inductance around some lines, thus judging the magnetic permeability. The larger the frequency, the lower the frequency. The higher the magnetic permeability of the ferrite, the higher the impedance at low frequencies and the lower the impedance at high frequencies. The initial permeability μ of the nickel-zinc ferrite NXO material is relatively low about 10-2500, and the frequency of use is from 500 kHz to several hundred megahertz. High resistivity, high Curie temperature. The initial permeability of the MnZn ferrite MXO material is from about 400 to 10,000, and the frequency of use is from tens of Hz to several hundred kHz. Used when the upper limit frequency f1 is lower than 500 kHz-1 MHz. Above this frequency, NiZn (nickel zinc NXO) material must be used

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