What are the function roles of magnetic toroidal coil inductors?

Inductor is mainly filtering, oscillation, delay, trap, image saying: “pass DC, block AC”. And magnetic beads are mainly to suppress electrical radiation interference, high-frequency noise and spike interference, absorption of ultra-high frequency signals, often used in PCB, DC/DC modules, high-frequency switches, switching audio amplifiers, data lines, power lines, signal lines, etc.. So what exactly is the difference between inductors and magnetic beads?

1, magnetic ring inductor magnetic beads and inductors with different frequency characteristics, in the low frequency band, the inductance of the beads become larger, wirewound inductor resistance becomes smaller, the inductance of the beads play a role, can be regarded as a low loss, high Q inductor; in the high frequency band, the inductance of the beads become smaller, the resistance becomes larger, resulting in an increase in total impedance, can be regarded as a resistance to high-frequency devices.

2, the size of the magnetic ring inductor bead selection depends entirely on the need to absorb the frequency of interference waves and the strength. Based on the main parameters: impedance (unit is Ω), DC resistance (unit is mΩ) and rated current (unit is mA) when the frequency is 100MHz.

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