The role of inductors was described in previous articles. So, what kinds of inductors are there?
Many classification methods of inductors can be divided into fixed inductors and variable inductors according to the inductance form. According to magnetic permeability properties, it is divided into a hollow coil, a ferrite coil, an iron coil, and a copper coil. The winding structure is divided into the single-layer coil, multi-layer coil, and honeycomb coil... This paper mainly introduces several common inductors.
1. Chip winding power inductor
It is generally composed of coils and magnetic cores, which filter and oscillate the circuit. It is characterized by a wide range of inductance, high precision inductance, low loss, simple production process, and low cost, but its disadvantage is that it is limited in further miniaturization.
2. Integrated forming inductor
Integrated molded inductors, also known as molded inductors, are made by burying the winding body into the metal magnetic powder. Compared with winding power inductors, it has a better magnetic shielding effect, strong anti-electromagnetic interference and strong saturation ability.
3. Laminated inductors
Therefore, the name thinks meaning, laminated inductors are many layers stacked together, but this layer refers to the ferrite layer. Laminated inductors, small size, a very high degree of standardization, very suitable for large-scale automated machine production.
4. Ferrite bead filter
The full name is ferrite magnetic bead filter, which has a remarkable effect in high-frequency filtering and has been widely used because of its low cost. At present, it includes a variety of packaging forms such as hollow magnetic beads, through-core magnetic beads, and patch magnetic beads.
5. I-inductor
I-inductors are generally composed of a magnetic core, wire winding, and other materials, their basic structure is similar to the winding power inductor, plug-in I-inductors can be designed into large current inductors because of their large volume and large winding space, so it has certain advantages in high-power product applications.
6. Hollow inductors
The hollow inductor is mainly used for signal processing and is used for resonance, receiving, and transmitting. Air can be used in high-frequency circuits, so some products that are not too demanding are still in use.
7. Rod inductors
The bar inductor is the enhanced version of the hollow inductor, the inductance value is proportional to the permeability, the magnetic material into the hollow coil, the inductance value, the Q value, etc., will be greatly improved.
8. Color ring inductor
Color ring inductors are improved products of rod inductors, mainly plug-in products, mainly used for signal processing. The price is very low, and many low-end electronic products still use color ring inductors.
9. Ring inductors
The toroidal inductor is mainly composed of the toroidal magnetic core, and coil device, is the most ideal inductor, a closed magnetic circuit, EMI performance is good, and easy to calculate and design, but its shortcomings needs manual winding.
10. Skeleton inductors
Common EE, UU structure, its essence is a common mode inductor, compared with the ring inductor, it has a higher degree of automation.
11. Flatline inductors
The improved product of the ring inductor can be automatically wound, the flat line has a large cross-sectional area and can ensure the passage of a large current, which can replace the ring inductor to a certain extent.
12. Transformer
Transformers can be counted as special inductors and are often used to switch power supplies. In addition, in the power topology, PFC inductors and LR inductors are commonly used, and some of the data is also regarded as a transformer, and its essence is an inductor.
