Adjustable magnetic ring

Abstract

Embodiments of the present invention provide an adjustable magnetic ring. The adjustable magnetic ring includes a housing and a plurality of semi-magnetic cores disposed in the housing; the housing includes an upper portion and a lower portion; every two semi-magnetic cores are coupled to form a complete magnetic core, and the complete magnetic cores are arranged in the housing; one ends of the upper portion and the lower portion of the housing are hinged, and fasteners are arranged on the other ends of the upper portion and the lower portion; the upper portion and the lower portion are fastened together through the fasteners. The adjustable magnetic ring is adjustable in magnetic ring material, cross-sectional area, and length. The most effective magnetic ring for noise is determined according to the magnetic ring material, the cross-sectional area, and the length. The upper portion and the lower portion of the housing are hinged through plastic connection members, and the flexibilityof the housing is improved. The other ends of the upper portion and the lower portion of the housing are connected through the fasteners, the upper semi-magnetic ring and the lower semi-magnetic ringcan be lap-jointed well to form a whole body, and gaps between the upper and lower magnetic cores can be prevented.

Description

technical field [0001] The invention relates to the field of magnetic ring design. Background technique [0002] In order to suppress noise, ferromagnetic materials are widely used in EMC. When applied to EMC testing, all ferromagnetic materials have 3 properties: (1) saturation; (2) frequency response; (3) ability to concentrate magnetic flux. [0003] (1) Saturation: The current I flows through the coil, and the current generates a magnetic field strength H, which is proportional to the product NI of the number of coil turns and the current. In this way, a magnetic flux density B is generated in the magnetic field, and B is multiplied by the cross-sectional area of ​​the magnetic core to obtain the magnetic flux. When the current is small, the magnetic flux is large; as the current increases, the magnetic flux rate decreases. This is the phenomenon in which the flux rate of a ferromagnetic core decreases as the current increases, called saturation. [0004] (2) Ability...

AI Technical Summary

Problems solved by technology

[0006] During the radiation test, the frequency range of 30Mhz-300Mhz is mainly to consider the shielding and noise removal of the wire, and with the increase of the frequency and age of the wire, the internal line loss gradually decreases, which leads to its shielding and impurity removal performance. It is greatly weakened, and the fixed magnetic ring on the wire and the existing magnetic ring are limited by materials, parameters, cross-sectional area and materials, which cannot remove noise well, resulting in noise and wire coupling to form a radiation antenna, enhancing Electromagnetic radiation, causing the product to fail during the radiation test (Fail)

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