CN210606850U

CN210606850U - Surface-mounted inductor with composite structure

Info

Publication number: CN210606850U
Application number: CN201921922234.6U
Authority: CN
Inventors: 庄仲郑; 王丹娜
Original assignee: Shantou Xinji Electronic Technology Co Ltd
Current assignee: Shantou Xinji Electronic Technology Co Ltd
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2020-05-22
Anticipated expiration: 2029-11-08

Abstract

The utility model relates to a composite construction's surface mounting inductor has built-in coil, center pillar to and two sets of clamp plate main parts, center pillar density is higher than clamp plate main part density, and the clamp plate main part is platelike, and clamp plate main part center is equipped with runway type hole site, and structural distribution during shaping does, and built-in coil below is arranged in respectively to two sets of clamp plate main parts, and the center pillar passes built-in coil center and upper and lower both ends correspond with the hole site of clamp plate main part respectively and peg graft, make two clamp plate main parts accomplish the parcel to built-in coil through the mould pressfitting, and integrated into one piece is the body. The utility model discloses an inductor of making, the body coverage is good, and there is almost no magnetic leakage flux, can furthest increase coil size, improves Lsat and reduces the Rdc, combines the shape of the independent center pillar of high density and clamp plate main part, can increase magnetic permeability, reduces the damage to the clamp plate main part, reduces the size of inductor.

Description

Surface-mounted inductor with composite structure

Technical Field

The utility model belongs to the technical field of at manufacturing surface mounting inductor, in particular to composite construction's surface mounting inductor.

Background

At present, a sealing material made of magnetic powder and resin has been widely used in the industry to form a coil surface-mount inductor, and this field emphasizes the Isat value of direct current superimposed current and the Rdc value of DC resistance, and the higher the Isat value, the lower the Rdc value is required, and therefore, on the premise of a small size, it is required to increase the size of a built-in coil while reducing leakage flux.

As in the patent literature: japanese patent No. 4714779 discloses a manufacturing method using an E-type tablet in which a coil formed by winding a copper wire is placed on an E-type flat plate, and both end portions of the coil are placed outside the outer wall of the flat plate, and then the coil and the flat plate are placed in a molding die so as to be sandwiched between the inner walls of the molding die, and a green body is formed by resin molding or powder molding. Although the coil position can be ensured to be centered in this way, the formed E-shaped flat plate needs to maintain the wrapping property and durability, so the outer wall thickness of the E-shaped flat plate needs to be at least 0.1 to 0.15mm or even larger, and if the size of the surface mount inductor is smaller, the fact that the outer wall of the E-shaped flat plate cannot be reduced is not negligible, so that the built-in coil can only be reduced, and the Rdc value cannot be reduced;

as another example, patent document: japanese patent No. 6060116 discloses a manufacturing method using a flat sheet, which uses a flat sheet type instead of an E-shaped flat sheet to increase the size of a built-in coil, but this method cannot fix the position of the coil when molding in a mold, and the resulting blank is not balanced in left and right directions, and the coil is exposed and generates more leakage flux, and the final product cannot achieve the best uniformity.

Disclosure of Invention

An object of the utility model is to prior art current situation, provide a composite construction's surface mounting inductor, under the less prerequisite of size, the body that forms has almost no magnetic leakage flux, and center pillar density is bigger, can improve electric characteristic ability, improves L value and Q value, improves Isat and Rdc value.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a composite construction's surface mounting inductor, has built-in coil, center pillar to and two sets of clamp plate main parts, center pillar density is higher than clamp plate main part density, and the clamp plate main part is platelike, and clamp plate main part center is equipped with runway type hole site and corresponds and supply the center pillar to peg graft, and structural distribution during shaping does, and built-in coil upper and lower side is arranged in respectively to two sets of clamp plate main parts, and the center pillar passes built-in coil center and upper and lower both ends correspond the grafting with the hole site of clamp plate main part respectively, and the parcel to built-in coil is accomplished to two clamp plate main parts.

Furthermore, the hole site of the pressure plate main body is a through hole or a counter bore.

Furthermore, the two side edges perpendicular to the main body of the pressure plate are provided with angular bulges.

Preferably, the density of the center pillar is more than one time higher than that of the platen body.

Further, the length between the side surface of the outer diameter of the built-in coil and the outer surface of the side of the blank body is less than 0.15 mm.

The utility model discloses a manufacturing method of composite construction's surface mounting inductor specifically includes following step:

(1) pre-rolling the built-in coil;

(2) mixing magnetic powder with thermosetting resin, preforming into two groups of completely same pressing plate main bodies, wherein the center of each pressing plate main body is provided with a runway-shaped through hole or a counter bore, and the edges of two sides vertical to the pressing plate main bodies are provided with horn-shaped bulges;

(3) mixing magnetic powder with thermosetting resin, and performing to form a central column of a columnar body, wherein the density of the central column is more than one time of that of the main body of the pressing plate, or the central column is formed by directly sintering a magnetic material, or the central column is made of other metal materials;

(4) in a forming die, two groups of pressing plate main bodies are respectively placed right above and right below a built-in coil, a middle column penetrates through the center of the built-in coil, the upper end and the lower end of the middle column are correspondingly inserted into hole positions of the pressing plate main bodies respectively, two poles of the built-in coil need to exceed the range of two end parts of the pressing plate main bodies respectively, and then the two groups of pressing plate main bodies and the built-in coil are integrally formed into a blank body by adopting pressurization or heating;

(5) after the two poles of the built-in coil are exposed outside the blank body after molding, and after insulators of the two poles are removed, external electrodes are formed at two ends of the blank body.

The utility model has the advantages that: adopt the coil that the coiling copper line formed and the sealing material that contains magnetic material and resin, and the independent center pillar of high density, integrated into one piece has the sealed blank of coil for the centre, because the independent center pillar of high density has increased the magnetic permeability, and the coil obtains the location of center pillar, can maximize the size that increases the coil and ensure the intermediate position of coil in the magnetism parcel, the magnetic powder at the clamp plate main part flows under thermosetting resin's drive, realize the parcel to the coil, can make coil side external diameter and the blank side outer wall thickness minimizing that forms, magnetic leakage flux has been reduced, the area that has increased built-in coil accounts for than, be fit for the production of small-size inductor, its manufacturing cost is lower.

Description of the drawings:

FIG. 1 is a structural distribution diagram of the present invention in an implementation state;

fig. 2 is a position distribution diagram of the middle press plate main body and the built-in coil of the present invention.

The specific implementation mode is as follows:

referring to fig. 1 and 2, which are schematic structural views of a preferred embodiment of the present invention, the present invention is a surface mount inductor with a composite structure, which has a built-in coil 1, a center pillar 11, and two sets of pressing plate bodies 2, wherein the density of the center pillar 11 is higher than that of the pressing plate bodies 2, and preferably, the density of the center pillar 11 is higher than that of the pressing plate bodies 2 by more than one time. By the high-density center pillars 11 being independently provided, magnetic permeability can be improved, and electrical characteristics can be improved while reducing the overall external dimensions of the inductor.

The concrete structure does, and clamp plate main part 2 is platelike, and clamp plate main part 2 center is equipped with runway type hole site 3, and clamp plate main part 2's hole site 3 is through-hole or counter bore, and center pillar 11 can be circular or quasi-circular, and the center of built-in coil 1 can be passed to the center pillar both ends promptly to can agree with hole site 3 can, preferably center pillar 11 shape and hole site 3 match, equally be the runway type.

The structure distribution during the molding is that two groups of pressing plate main bodies 2 are respectively arranged above and below the built-in coil 1, the central column 11 penetrates through the center of the built-in coil 1, the upper end and the lower end of the central column are respectively correspondingly inserted with the hole positions 3 of the pressing plate main bodies 2, the two pressing plate main bodies 2 are pressed by a die to wrap the built-in coil 1, and the blank is integrally molded.

In order to make the pressing plate main body 2 more wrappable to the built-in coil 1 in the process of integrating, an angular protrusion 21 may be provided on both side edges perpendicular to the pressing plate main body 2. During specific implementation, the horn-shaped protrusions 21 of the upper and lower pressing plate main bodies 2 need to be opposite, the built-in coil 1 is arranged between the two pressing plate main bodies 2, two side faces, not containing electrodes, of the built-in coil 1 need to correspond to two sides, provided with the horn-shaped protrusions 21, of the pressing plate main bodies 2, and the end parts of two poles of the built-in coil 1 should exceed the two end parts of the pressing plate main bodies 2, so that the two poles of the coil can be located outside a blank body after the.

Isat and Rdc are preferable if the built-in coil 1 is as large as possible, so that the outer diameter of the coil can be kept small from the inner dimension of the mold, and as a small-sized inductor, the outer diameter of the side surface of the built-in coil and the length of the outer surface of the side surface of the green body are less than 0.15 mm.

The thermosetting resin may be a hot air epoxy resin having a temperature resistance level of 220 c, and by molding with the resin, the protrusions corresponding to the press-fit surfaces on the side surfaces of the coil flow between the side surfaces of the coil and the inner wall of the mold, and even if the coil is enlarged, a molded body in which the entire coil is covered with the resin can be formed.

(1) pre-rolling the built-in coil;

Of course, the above illustration is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, so all equivalent changes made in the principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A surface mount inductor of composite construction characterized by: the novel steel wire pressing plate is provided with a built-in coil, a middle column and two groups of pressing plate main bodies, wherein the density of the middle column is higher than that of the pressing plate main bodies, the pressing plate main bodies are plate-shaped, a runner type hole position is arranged in the center of each pressing plate main body and corresponds to the middle column to be inserted, the two groups of pressing plate main bodies are structurally distributed during forming, the upper side and the lower side of the built-in coil are respectively arranged in the two groups of pressing plate main bodies, the middle column penetrates through the center of the built-in coil, the upper end and the lower end.

2. A composite structure surface mount inductor according to claim 1, wherein: the hole site of clamp plate main part is through-hole or counter bore.

3. A composite structure surface mount inductor according to claim 1, wherein: the two side edges vertical to the main body of the pressure plate are provided with angular bulges.

4. A surface mount inductor of composite construction as claimed in claim 1, 2 or 3, wherein: the density of the center pillar is more than one time higher than that of the main body of the pressing plate.

5. A surface mount inductor of composite construction as claimed in claim 1, 2 or 3, wherein: the length between the side surface of the external diameter of the built-in coil and the external surface of the side of the blank body is less than 0.15 mm.