CN219457307U

CN219457307U - Ferrite inductance structure

Info

Publication number: CN219457307U
Application number: CN202320429402.8U
Authority: CN
Inventors: 王春; 全东飞; 徐晖; 陈也也; 张保清; 许帅莲; 吴依琳; 谭颖慧
Original assignee: Dongdianhua Electronics Zhuhai Co ltd
Current assignee: Dongdianhua Electronics Zhuhai Co ltd
Priority date: 2023-03-07
Filing date: 2023-03-07
Publication date: 2023-08-01
Anticipated expiration: 2033-03-07

Abstract

The utility model relates to the technical field of inductors, in particular to a ferrite inductor structure, wherein a magnetic core is provided with air gaps with different depths, and when a direct current magnetic field is superposed, a part with small air gap depth and a part with large air gap depth are saturated in sequence, so that the direct current superposition characteristic shows soft saturation; meanwhile, the original one-section air gap is divided into a plurality of sections to form a gradient air gap, the outward bulge degree of magnetic force lines at the edge of the air gap is gradually reduced, the degree of magnetic force lines cutting copper wires is gradually reduced, copper loss caused by magnetic force lines cutting a magnetic core is reduced, and the magnetic core loss is reduced.

Description

Ferrite inductance structure

Technical Field

The utility model relates to the technical field of inductors, in particular to a ferrite inductor structure.

Background

Ferrite is known to have high resistivity, high initial permeability, low remanence, low coercivity, low loss, and low cost. However, since Bs of ferrite are low, dc superposition characteristics are poor. The saturation state is reached earlier under the same direct current superimposed magnetic field strength. This limits the specific application of the material in certain applications. The dc superposition characteristics of the material are affected by Bs, and the air gap structure also affects the dc superposition characteristics of the material. Therefore, optimizing the air gap structure of the ferrite is a relatively efficient way if the dc superposition characteristics of the material are to be further improved.

The traditional ferrite is always open with an air gap parallel to the center pillar, and the depth air gap can improve the direct current superposition characteristic of the material to a certain extent, but can increase the leakage inductance of the material and weaken the inductance value of the material and other electromagnetic characteristics.

Disclosure of Invention

To achieve the above object, the present utility model provides a ferrite inductor structure, comprising:

the magnetic core is provided with at least one first part, the first part is provided with air gaps with different depths, the bulge degree of magnetic force lines at the edge of the air gaps is gradually reduced, and the degree of magnetic force lines cutting copper wires can be gradually reduced;

a bobbin covering the core; and

A winding wound around the armature outside the first portion.

In some possible implementations, the magnetic core is made of a material that is one or a combination of manganese-zinc ferrite, nickel-zinc ferrite, or magnesium-zinc ferrite.

In some possible implementations, the magnetic core has a center leg and at least one side leg, and the air gap is disposed on the center leg or side leg.

In some possible implementations, the magnetic core includes an upper yoke and a lower yoke, the upper yoke and the lower yoke each having the center leg and the side leg disposed thereon, the center leg or side leg on the upper yoke corresponding to the center leg or side leg on the lower yoke and forming the air gap at a mating surface.

In some possible implementations, the air gap is right triangle in shape, and an air gap surface in the air gap is a slope.

In some possible implementations, the air gap surface is inclined at an angle of 0 to 60 °.

In some possible implementations, the air gap is triangular in shape with a hypotenuse that is arcuate, and the air gap face of the air gap is arcuate.

In some possible implementations, the winding is composed of a wire and an insulating film coating the wire.

In some possible implementations, the wire is a copper wire, an aluminum wire, a silver wire, or an iron wire.

In some possible implementations, the insulating film is formed by coating the wire with an insulating varnish containing polyester-based, polyurethane-based, and polyimide-based materials.

Compared with the prior art, the utility model has the beneficial effects that: the ferrite inductance structure is designed with the air gaps with different depths, the original air gap is divided into a plurality of sections to form the gradient air gap, the outward bulge degree of magnetic force lines at the edge of the air gap is gradually reduced, the degree of cutting copper lines by the magnetic force lines is gradually reduced, copper loss caused by cutting magnetic cores by the magnetic force lines is greatly reduced, and the magnetic core loss is reduced. When the direct current magnetic field is superimposed, the part with small air gap depth and the part with large air gap depth are saturated in sequence, so that the direct current superposition characteristic shows soft saturation.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic three-dimensional structure of a ferrite inductor structure according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of a portion of a ferrite inductor structure according to an embodiment of the present utility model;

fig. 3 is a schematic diagram of a part of a ferrite inductor structure according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of a magnetic core according to an embodiment of the present utility model.

Reference numerals:

a magnetic core 10, an air gap 11, a middle column 12, a side column 13, an upper yoke piece 14 and a lower yoke piece 15;

a skeleton 20;

windings 30.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.

Referring to fig. 1 to 4, a ferrite inductance structure includes a magnetic core 10, a skeleton 20 and a winding 30, wherein the magnetic core 10 has at least one first portion, an air gap 11 with different depths is disposed on the first portion, and the degree of swelling of magnetic lines of force at the edge of the air gap 11 is gradually reduced, so that the degree of cutting of copper lines by the magnetic lines of force is gradually reduced; the framework 20 is covered outside the magnetic core 10; a winding 30 is wound around the armature 20 outside the first portion. The shape of the core 10 in the present application may be EE-shaped, EC-shaped, EQ-shaped, ER-shaped, PQ-shaped, or the like, and is not limited to the above. In fact, the ferrite inductor structure is designed with the air gaps 11 with different depths, the original air gap 11 is divided into a plurality of sections to form the gradient air gap 11, the outward bulge degree of magnetic force lines at the edges of the air gap 11 is reduced, copper loss generated by cutting the magnetic core 10 by the magnetic force lines is reduced, and the loss of the magnetic core 10 is reduced. When the dc magnetic field is superimposed, the portion of the air gap 11 having a small depth and the portion of the air gap 11 having a large depth are saturated in order, and thus the dc superimposed characteristic exhibits soft saturation.

In some possible implementations, the magnetic core 10 is made of one or more materials selected from manganese-zinc ferrite, nickel-zinc ferrite and magnesium-zinc ferrite, and the ferrite has high magnetic permeability and low magnetic core loss, which is especially beneficial to manufacturing large inductance. However, ferrite has low saturation magnetic flux density, is easy to magnetically saturate under high current, and other components of the switching power supply can be burnt out when the magnetic core 10 is saturated, so that the saturation capacity of the material can be improved to a certain extent by adopting the design of the application.

In some possible implementations, referring to fig. 1 to 3, since the shape of the magnetic core 10 may be EE-shaped, EC-shaped, EQ-shaped, ER-shaped, and PQ-shaped, the present application describes in detail, for convenience of description, the core 10 has a center leg 12 and at least one side leg 13, and the air gap 11 is disposed on the center leg 12 or the side leg 13. In practice, the design of the air gap 11 is selected according to the requirement, and the air gap 11 is designed on the center post 12 for convenience of description. In fact, the first part in this application may be the center pillar 12 or the side pillar 13.

In some embodiments, the magnetic core 10 includes an upper yoke 14 and a lower yoke 15, the middle leg 12 and the side leg 13 are disposed on the upper yoke 14 and the lower yoke 15, and the middle leg 12 or the side leg 13 on the upper yoke 14 corresponds to the middle leg 12 or the side leg 13 on the lower yoke 15 and forms the air gap 11 at a mating surface. The above-mentioned air gap 11 is designed on the center pillar 12 by way of example in the present application, and in practice, the cross section of the air gap 11 may be linear or nonlinear, as long as it can be multi-stepped. In practice, in the present application, an air gap 11 may be provided on either the center leg 12 or the side leg 13, with the size of the air gap 11 being designed according to the size of the winding 30.

Referring to fig. 3, in one embodiment of the present application, the shape of the air gap 11 is a right triangle, and the air gap surface in the air gap 11 is a slope, so that the cross section of the air gap 11 is linearly distributed, and thus the degree of outward bulge of the magnetic force lines at the edge of the air gap 11 is reduced. In this embodiment, the whole air gap 11 is in a linear design, so that direct current superposition is facilitated, copper loss caused by cutting of magnetic cores by magnetic lines is greatly reduced, and magnetic core loss is reduced.

In the above-described modification, the inclination angle of the air gap 11 surface is 0 to 60 ° in order to reduce the degree of outward bulge of the magnetic lines.

Referring to fig. 4, in a modified embodiment, the air gap 11 is triangular with a hypotenuse being arc-shaped, and the air gap surface of the air gap 11 is arc-shaped. The arc-shaped design of the air gap 11 means that the depth of the air gap increases in a nonlinear manner, and the air gap 11 can be understood as a combination of air gap 11 segments with different depths. In some embodiments, the arcuate design may be an elliptical arc with a ratio of the minor axis to the major axis of the elliptical arc greater than 1, the minor axis being perpendicular to the mating surface of the core 10 and the major axis being parallel to the mating surface of the core 10.

In some possible implementations, the winding 30 is composed of a wire and an insulating film coating the wire. Wherein the windings 30 are wound around the backbone 20, in this case designed on the center post 12; the lead is copper wire, aluminum wire, silver wire or iron wire; and the insulating film is formed by coating insulating paint containing polyester, polyurethane and polyimide materials on the outside of the wire.

The foregoing is merely illustrative of specific embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any changes or substitutions within the technical scope of the present utility model should be covered by the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. A ferrite inductor structure, comprising:

the magnetic core (10) is provided with at least one first part, the first part is provided with air gaps (11) with different depths, the degree of swelling of magnetic force lines at the edge of the air gaps (11) is gradually reduced, and the degree of cutting the copper wires by the magnetic force lines can be gradually reduced;

-a skeleton (20) covering the outside of the core (10); and

A winding (30) wound around the armature (20) outside the first portion.

2. A ferrite inductance structure according to claim 1, characterized in that the magnetic core (10) is made of a material of one or a combination of several of manganese-zinc ferrite, nickel-zinc ferrite or magnesium-zinc ferrite.

3. A ferrite inductance structure according to claim 1, characterized in that the core (10) has a center leg (12) and at least one side leg (13), the air gap (11) being provided on the center leg (12) or side leg (13).

4. A ferrite inductance structure according to claim 3, wherein the magnetic core (10) comprises an upper yoke (14) and a lower yoke (15), the upper yoke (14) and the lower yoke (15) are provided with the center pillar (12) and the side pillar (13), and the center pillar (12) or the side pillar (13) on the upper yoke (14) corresponds to the center pillar (12) or the side pillar (13) on the lower yoke (15) and forms the air gap (11) at the mating surface.

5. A ferrite inductor structure according to claim 1 or 3, characterized in that the air gap (11) has a right triangle shape, and the air gap surface in the air gap (11) is a slope.

6. A ferrite inductance structure according to claim 5, characterized in that the angle of inclination of the air gap (11) face is 0-60 °.

7. A ferrite inductance structure according to claim 1 or 3, wherein the air gap (11) has a triangular shape with a sloping side being an arc shape, and the air gap surface of the air gap (11) is an arc surface.

8. A ferrite inductance structure according to claim 1, wherein the winding (30) is constituted by a wire and an insulating film coating the wire.

9. The ferrite inductor structure of claim 8, wherein the conductive wire is copper wire, aluminum wire, silver wire, or iron wire.

10. The ferrite inductance structure according to claim 8, wherein the insulating film is formed by coating an insulating paint containing polyester-based, polyurethane-based and polyimide-based materials outside the wire.