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First, the occasion of the application of inductor.
Attention should be paid to moist and drying, concave and convex ambient temperature, high-frequency or low-frequency environment, rational inductance or impedance characteristics, etc.
Second, the frequency characteristics of inductors.
At low frequency, the inductor usually has the characteristics of inductance, which only plays the role of energy storage and high frequency filtering.
But at high frequency, its impedance characteristic is very obvious. There is a phenomenon of energy consumption and heat, and the rational effect is reduced by one level. The high frequency characteristics of different inductors are different.
The inductance of ferrite material is explained below:
The ferrite material is Fe-mg alloy or Fe-Ni alloy, which has high magnetic conductivity, so the capacitance between the inductor coils and windings is the smallest under the condition of high frequency and high resistance. Ferrite materials are usually used at high frequency, because they are mainly inductive at low frequency, making the on-line loss very small. In the case of high frequency, they mainly show the reactance characteristic ratio and change with the frequency. In practical application, ferrite materials are used as high frequency attenuators in RF circuits. In practice, ferrite is better equivalent to the parallel connection of resistance and inductor. the resistance is short-circuited by inductor at low frequency and the inductance impedance becomes so high at high frequency that the current passes through the resistance. Ferrite is a consuming device on which high-frequency energy is converted into thermal energy, which is determined by its resistance characteristics.