(1).Magnetic ring inductance is a kind of electronic component, its main function is to convert electromagnetic induction. A simpler inductance can be a wire, which can be used as an antenna. Converting electrical energy into electromagnetic waves, the more complicated thing is the hollow line diagram, which can be used in frequency selection loops and RF transmission circuits. There are also common mode inductors that can be used to resist interference.
(2).Since the use of ferrite beads in the circuit can increase the high frequency loss without introducing DC loss, and it is small in size and easy to install on the lead or wire of the interval, the suppression effect of the noise signal above 1MHz is very obvious, so it can be used It is used for decoupling, filtering and parasitic oscillation suppression of high-frequency circuits.
(3).In the high frequency band, the impedance of the magnetic ring inductance is mainly composed of resistance components. As the frequency increases, the magnetic permeability of the magnetic core decreases, resulting in a decrease in the inductance of the inductance and a decrease in the inductive reactance component. The loss increases and the resistive component increases, resulting in an increase in the total impedance. When the high-frequency signal passes through the ferrite, the inductive electromagnetic interference is absorbed and converted into heat energy to be consumed. In the low frequency band, the impedance is mainly composed of the inductive reactance of the inductor. At low frequencies, R is very small, and the magnetic permeability of the magnetic core is high, so the inductance is large, the inductance L plays a major role, and the electromagnetic interference is reflected and suppressed, and this When the core loss is small, the whole device is a low-loss, high-quality factor Q-characteristic inductor, which is easy to cause resonance, so the phenomenon of increased interference after the use of ferrite beads may occur at low frequency.
