How much do you know about button magnetic rings and flat magne
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Ningbo Tengxiao Magnetic Industry Co., Ltd. is a professional supplier of magnetic products and magnetic equipment, specializing in the production of high-quality bulk magnetic hooks, magnetic badges, magnetic office supplies and other magnetic equipment, as well as custom industrial magnets.
Flat magnetic rings are used for various sizes of cables, filter cables, audio cables, video cables, communication network cables, etc. The flat magnetic ring has different impedance characteristics at different frequencies. Generally, the impedance is very small at low frequencies, and the impedance rises sharply at high frequencies.
The higher the signal frequency, the easier it is for the magnetic field to radiate out. Generally, the cable is not shielded. For example, the CAN bus I use now. These cables become perfect antennas. This antenna continuously receives surrounding high-frequency signals. The superposition of signals changes the actual signal to be transmitted.
The flat magnetic ring can pass useful signals well while suppressing high-frequency interference signals. In the high-frequency (greater than 10MHz) magnetic ring, the inductive reactance remains small, and the impedance is large, so that when the energy of the high-frequency signal passes through the magnetic material, it is converted into heat and emitted, thereby hindering the passage of the high-frequency signal and suppressing The interference of high-frequency signals.
Usually the best suppression frequency range is related to the ferrite suppression component. Generally, the higher the magnetic permeability, the lower the suppression frequency. The larger the ferrite volume, the better the suppression effect. When the volume is constant, the length and the thin are shorter than the The coarse suppression effect is good, the smaller the internal strength, the better the suppression effect.
Advantages of buckle magnetic ring:
1. It is very convenient to use, just put it on the cable that needs filtering.
2. It does not need to be grounded like other filtering methods, so there is no special requirement for structure design and wiring harness.
3. When used as a common mode choke, it will not cause signal distortion, which is very valuable for wires that transmit high-frequency signals. The biggest difference between the button magnetic ring and the ordinary ferrite is that it has a large loss. The inductor made with this button magnetic ring has a characteristic closer to the resistance.
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