This time I will introduce you to a representative noise countermeasure component. The first is a sheet-like ferrite bead, which is a product that processes a ferrite bead inductor into an SMD (surface-slice) shape.
<Ferrite bead is a component that passes a wire through a ferrite>
Fig. 1 is an appearance example of a lead type ferrite bead inductor. Its structure is very simple, and the wires run through the ferrite. Although not wound like a normal coil, when a current passes through the wire, magnetic induction occurs in the core, so the ferrite bead acts as an inductor. In addition, since the ferrite material has a large loss at a high frequency, the current in the high frequency can be filtered in the ferrite, so that noise can be effectively absorbed.
<Structure of Inductor Formed by Lamination of Chip Ferrite Beads>
The flaky ferrite bead is a product in which a ferrite core inductor is made into a patch type, and FIG. 2 is its most representative structure. A three-dimensional coil structure is realized by forming a conductor coil between the ferrite layers and performing calcination by integral processing.
In addition to the sheet shape, by processing the inside into a coil structure, a larger impedance value than a lead type magnetic bead inductor that passes only one wire is obtained. (In fact, there is also a sheet-like ferrite bead in which only a wire passes through this structure). This structure is basically the same as the chip laminated inductor, but differs from the inductor in that the ferrite material is more suitable for noise countermeasures. Fig. 3 is an example of impedance frequency characteristics of a sheet-like ferrite bead. It can be seen from the figure that, like the inductor, its impedance also increases with increasing frequency, and it can act as a low-frequency filter by connecting it in series. In the impedance value (Z) of the ordinary inductor, the reactance component (X) is mainly used, and the chip magnetic beads are mainly ferrite materials in the high frequency range, so the resistance component is mainly in the high frequency band ( R). Since the reactance component is not lost and the resistance component is lost, the chip magnetic ball has better performance of absorbing noise energy than the general inductor, and the noise suppression effect is also better.
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