Understand the role of inductors and the functions and uses of inductors
Inductor (inductor) is used to provide inductance of the device, with a variety of coil winding insulation wire called inductance. Its main role is to stop circulating DC resistance and high-frequency low pass, that is to say the high frequency signal through the induction coil will encounter great resistance, through the difficult and the present low frequency signal through it when resistance is relatively small, low frequency signal can be easily through it. The DC resistance of the inductor is almost zero.
1, according to the classification of the nature of the magnetic conductor: air core coil, ferrite coil, iron core coil, copper core coil.
2, according to the nature of the work: antenna coil, coil, choke coil, notch, deflection coil.
3, according to the classification of single coil winding structure, multilayer coil, honeycomb coil. High frequency chip ceramic inductor
4, according to the classification of inductance: fixed inductance coil, variable inductance coil.
5, according to the structure characteristics of magnetic core coil, variable inductor, color code inductance coil, magnetic core coil etc..
In addition, according to the working frequency and the size of the current, divided into high frequency inductors, power inductors, etc..
Basic use of inductor
1, the role of the inductor is mainly through DC, AC resistance, the main circuit in the filter, oscillation, delay, trapping and other functions. The inductance coil has negative effects on the AC current, block size inductance XL ohms. The relationship between it and the inductance L and the frequency of F PI was XL=2 fL, the inductor can be divided into low frequency and high frequency choke coil choke coil. Tuning and frequency: inductor in parallel with the capacitor formed LC tuning circuit. The natural oscillation frequency of the F0 circuit and AC signal frequency is equal to F, and the capacitance loop inductance are equal, so the electromagnetic energy in the inductor and capacitor oscillating circuit, the resonance phenomenon of LC. When the resonant circuit inductance and capacitance equivalent and reverse current circuit, the total inductance current minimum, maximum amount (f= "F0" LC, AC signal) resonant circuit has frequency selection function, can be AC signal of a certain frequency of the selected F.
2, inductor and filter signal, filtering noise, stable current and suppress electromagnetic interference and so on. In the electronic device, often see some ring, the ring and the connecting cable constitute an inductor (cable in magnetic ring around a few times, it is the inductance coil) interference components commonly used in electronic circuits, high frequency noise has good shielding effect, so it is called absorption ring, usually use iron ferrite material, also called ferrite (referred to as ring). Rings have different resistance characteristics at different frequencies. Impedance at low frequency is very small, when the signal frequency is increased after the magnetic impedance change sharply.