Common-mode and differential-mode filtering integrally-formed magnetic core

Abstract

The utility model relates to the technical field of soft magnetic ferrite magnetic core production and manufacturing, and discloses a common-mode and differential-mode filtering integrally-formed magnetic core which comprises an outer frame magnetic core and a middle core magnetic column, the middle core magnetic column comprises an upper magnetic column and a lower magnetic column which are oppositely arranged, the ends, deviating from each other, of the upper magnetic column and the lower magnetic column are integrally formed with the outer frame magnetic core, and the outer frame magnetic core and the middle core magnetic column are integrally formed. And an air gap is formed between two opposite ends of the upper magnetic column and the lower magnetic column. According to the utility model, magnetic core production procedures can be simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of production and manufacturing of soft ferrite cores, in particular to a common-differential mode filtering integrated magnetic core. Background Art

[0002] Soft ferrite cores can be used in common-mode and differential-mode filter inductors. When the common-mode and differential-mode inductors can be integrated into a circuit, the overall volume of the device can be reduced. Existing common-mode and differential-mode filter cores are generally EE-type paired cores, which use two separate EE cores, grind the middle column to create an air gap, and then glue them together for use. The outer frame core is used as a common-mode inductor, and the middle column core is used as a differential-mode inductor. The disadvantage of the prior art is that the production process of the EE paired core requires an additional action of grinding the middle column core to create an air gap, and when winding the wire to make the inductor, the mating surfaces of the two cores need to be glued and cured, so that the magnetic circuit of the outer frame core is cut off, and there is a small amount of magnetic leakage, so the common-mode inductance and impedance cannot obtain very high values. In addition, the existing method of E-type magnetic core requires grinding the middle column magnetic core to obtain an air gap, and then EE matching is performed, and the mating surfaces need to be glued, assembled and cured. Since the two halves of the E-type magnetic core are produced and processed separately, the sizes have a certain discrete distribution, and there will be misaligned steps when they are matched. To reduce the error step difference, the E-type magnetic core also needs to be divided into size grades. In order to solve the defects of the existing technology, an integrally molded magnetic core is needed. Utility Model Content

[0003] The utility model aims to provide a common-differential mode filter integrally formed magnetic core, which has the effect of simplifying the production process of the magnetic core.

[0004] The above technical objectives of the utility model are achieved through the following technical solutions:

[0005] A common-differential mode filtering integrally formed magnetic core comprises an outer frame magnetic core and a middle core magnetic column, wherein the middle core magnetic column comprises an upper magnetic column and a lower magnetic column, the upper magnetic column and the lower magnetic column are arranged opposite to each other, the ends of the upper magnetic column and the lower magnetic column facing away from each other are integrally formed with the outer frame magnetic core, and an air gap is arranged between the opposite ends of the upper magnetic column and the lower magnetic column.

[0006] As a further configuration of the present invention, chamfers are provided at the end corners of the two opposite ends of the upper magnetic column and the lower magnetic column.

[0007] The beneficial effects of the utility model are:

[0008] The utility model adopts an integrated molding design. When designing the air gap in the middle, a large R angle is specially added to the end face of the middle column core. The corresponding core rod is designed to be I-shaped, which can be convenient for molding and pressing. The process of grinding the middle column air gap and the process of pairing and dispensing the cores can be eliminated. The tolerance mode inductance can be directly obtained by winding the left core and the right core. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0010] Figure 1 It is a schematic diagram of the overall structure of this embodiment;

[0011] Figure 2 Schematic diagram of the mold mentioned in this embodiment;

[0012] Figure 3 It is a schematic diagram of a single E-type magnetic core structure in the prior art;

[0013] Figure 4 This is a schematic diagram of the structure of the prior art EE type magnetic core after assembly;

[0014] In the figure, 1, outer frame magnetic core, 2, middle core magnetic column, 21, upper magnetic column, 22, lower magnetic column, 3, mold, 31, transition beam. DETAILED DESCRIPTION

[0015] The technical solution of the utility model will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] Example

[0017] A common-differential mode filtering integrated magnetic core comprises an outer frame magnetic core 1 and a center magnetic column 2. In the present embodiment, the outer frame magnetic core 1 is configured as a quadrilateral frame, and the left and right sides are a left magnetic core and a right magnetic core for winding. The center magnetic column is located inside the outer frame magnetic core 1. Specifically, the center magnetic column is located between the left magnetic core and the right magnetic core. The center magnetic column 2 comprises an upper magnetic column 21 and a lower magnetic column 22. The upper magnetic column 21 and the lower magnetic column 22 are arranged opposite to each other. The ends of the upper magnetic column 21 and the lower magnetic column 22 that are opposite to each other are integrally formed with the outer frame magnetic core 1, and an air gap is provided between the opposite ends of the upper magnetic column 21 and the lower magnetic column 22.

[0018] Furthermore, chamfers are provided at the end corners of the two opposite ends of the upper magnetic column 21 and the lower magnetic column 22. By designing a suitable chamfer, when the magnetic core is formed, the mold corresponding to the upper magnetic column 21 and the lower magnetic column 22 is designed to be I-shaped. Due to the large R angle design, the transition beam in the middle of the I-shaped core rod mold is strengthened, especially when the air gap size is very small, such as 1mm, the corresponding beam size is 1.18mm (the design shrinkage rate of the green and cooked blanks of the magnetic core molding is 1.18), this size is very small, if it is a right-angle design, the size and width of the upper magnetic column 21 and the lower magnetic column 22 are very large, then during the molding and pressing, the transition beam in the middle of the mold is easy to tear the transition beam during the extrusion or demolding process, so the design of the chamfer can greatly enhance the strength of the transition beam of the mold.

[0019] The common-differential mode filter inductor magnetic core of the present embodiment can be integrally formed, and the magnetic core product has a center column air gap after sintering. The common-differential mode inductor can be directly wound on the left magnetic core and the right magnetic core, without the need for center column air gap processing like the E-type magnetic core, and the magnetic core assembly does not require gluing of the mating surfaces.

Claims

1. A common and differential mode filter integrated magnetic core, characterized in that: The invention comprises an outer frame magnetic core (1) and a middle core magnetic column (2), wherein the middle core magnetic column (2) comprises an upper magnetic column (21) and a lower magnetic column (22), wherein the upper magnetic column (21) and the lower magnetic column (22) are arranged opposite to each other, and the ends of the upper magnetic column (21) and the lower magnetic column (22) which are separated from each other are integrally formed with the outer frame magnetic core (1), and an air gap is arranged between the opposite ends of the upper magnetic column (21) and the lower magnetic column (22).

2. The common-differential mode filter integrated magnetic core according to claim 1, characterized in that: Chamfers are provided at the end corners of the opposite ends of the upper magnetic column (21) and the lower magnetic column (22).

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