How to distinguish shielded inductor and unshielded inductor?
I believe many people are confused about the comparison of shielded inductor and unshielded inductor. According to the difference of magnetic shielding performance, there are two different names of shielded inductor and unshielded inductor. Shielded inductor includes chip inductor and I-shaped inductor, and the same is true for unshielded inductor.
So how do we fast zone shielded inductor and unshielded inductor? What are the differences between them?
1. Distinguish between shielded inductor and unshielded inductor in appearance
The shielding inductor has a magnetic shielding structure outside, so the coil winding must be unshielded inductor from the appearance, and the coil winding cannot be seen from the appearance of the shielding inductor.
But there is one exception to note: the invisible coil is not necessarily the shielded inductor, but it may also be the I-shaped inductor with a thermally flexible sleeve.
Second, the magnetic circuit composition structure distinguishes shielded inductor and unshielded inductor
III. 1. The magnetic circuit structure of the shielded inductor is a closed magnetic circuit structure: the closed magnetic circuit structure is composed of magnetic materials with very small magnetic impedance, which means that the magnetic core is a toroidal core, which is a closed magnetic circuit structure.
4. The magnetic circuit structure of the unshielded inductor is an open magnetic circuit: since the magnetic circuit composition structure is exposed, it has a very obvious air gap, and its impedance is relatively large, which means that the magnetic core is U-shaped or EE-shaped core.
Five, three, distinguish shielded inductor and unshielded inductor in terms of performance
6. Due to the different magnetic shielding structures of shielded inductors and unshielded inductors, under the same inductor and operating current, the volume of the shielded inductors is larger than that of the unshielded inductors.
7. The unshielded inductor has the characteristics of high saturation magnetic rate, small size and low impedance. Mainly focused on plug-in inductors, part of the chip inductors GCD series (which will soon be replaced by shielded inductors), and rod inductors.
8. 3. The shielding inductor has the characteristics of high power, low resistance and high current. Mainly used in circuits that have high requirements for EMC, involving signal transmission, intelligent calculation, etc., such as mobile phones, computers, high-quality audio and so on.
