What are the applications of inductance magnetic ring?
Source：Release time：2019-08-20
A circular and to absorb and filter, motor, in addition to should choose high permeability of a conductive material, they presented to the high frequency component in a circuit resistance is about ten to several hundred, so its role in the high impedance circuit is not obvious, on the contrary, in a low impedance circuit (such as power distribution, power supply or rf circuit) in use will be very effective.
Second, the motor magnetic ring at high frequencies (> 10 MHZ), impedance remains very small, and the impedance is large, makes the energy of the high frequency signal through the magnetic materials, converted to heat, from hindered the high frequency signal through, suppress the high frequency signal interference, usually the best inhibiting frequency range associated with ferrite suppression components, generally the higher the permeability, restrain the lower the frequency, the ferrite volume, the greater the inhibition effect is better, a certain volume, long and thin than inhibition of short and thick strength inside the effect is good, the less inhibition effect.
Three, electrical impedance characteristics of circular and annular core under different frequencies have different, generally low frequency impedance is very small, the high frequency impedance rise sharply, the higher the signal frequency, magnetic field, the easier the radiation, generally there is no shielding signal lines, now I am using CAN bus, for example, the signal is perfect antenna, the antenna continuously receives the high frequency signal, around these signals for transmission of signal superposition changed, magnetic ring CAN be very good through the useful signal, inhibit the interference of high frequency signal at the same time.
Four circular and suppress common mode interference signal, motor, magnetic ring can be signal (the roots difference signal lines) or the power cord (plus or minus) through at the same time, in order to increase the effect, can be in the circular symmetrical around in circles, increase the inductance, enhance the absorption effect of the common mode signal, but has no effect on poor touch signal, components shall be installed near the interference sources, the input and output circuit, should be close to the import and export of shielding box.
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