CN212934305U

CN212934305U - Common mode inductor

Info

Publication number: CN212934305U
Application number: CN202021248386.5U
Authority: CN
Inventors: 马国强; 翟振卫; 王先权; 苏相河; 覃宗爱; 张金锁; 王常辉; 易志福
Original assignee: Huizhou U&t Electronics Co ltd
Current assignee: Huizhou U&t Electronics Co ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-04-09
Anticipated expiration: 2030-06-30

Abstract

The utility model provides a common mode inductance, including magnet and winding external member, the through-hole has been seted up on the magnet, the winding external member includes stopper and a plurality of copper foil, be provided with spacing step on the stopper, the stopper holding is in the through-hole, and spacing step and magnet looks butt, each copper foil wears to establish the stopper respectively, in one of them copper foil, be provided with the kink on the both ends of copper foil respectively, each copper foil wears to establish in the through-hole, consequently, do not need the coiling, thereby can reduce the production degree of difficulty, each copper foil can share the magnet simultaneously, make per two copper foils can form a monomer common mode inductance, consequently can integrate a plurality of monomer common mode inductances and can not obviously increase the volume, and avoided the magnetic leakage problem that causes because of there being the clearance between the coil, thereby can strengthen the filtering effect.

Description

Common mode inductor

Technical Field

The utility model relates to a technical field of inductance especially relates to a common mode inductance.

Background

The common mode inductor is also called a common mode choke. Various high-frequency circuits, digital circuits and analog circuits are mixed in computers, servers and the like, and when the high-frequency circuits, a large number of high-frequency electromagnetic waves are generated to interfere with each other and are emitted outwards, so that electromagnetic radiation pollution is caused, normal work of other electronic equipment is influenced, and the high-frequency circuits, the digital circuits and the analog circuits are harmful to human bodies. The common mode inductance is essentially a bi-directional filter: on one hand, common mode electromagnetic interference on a signal line needs to be filtered, on the other hand, electromagnetic interference which is not emitted outwards needs to be restrained, and normal work of other electronic equipment under the same electromagnetic environment is prevented from being influenced, so that common mode inductance is commonly used for restraining various electromagnetic equipment with electromagnetic interference.

The structure of the current common mode inductor is usually that enameled wires are used for symmetrically winding coils with opposite directions and the same number of turns on a circular magnetic ring, however, the current common mode inductor has the following problems:

firstly, two coils in opposite directions need to be wound on a closed magnetic ring of the conventional common mode inductor, and particularly, because the common mode inductor is usually small in size and large in difficulty in winding the coils on the closed magnetic ring, a production mode of manual winding is often adopted, so that the conventional common mode inductor is large in production difficulty, time-consuming and labor-consuming;

secondly, in the conventional common mode inductor, only two coils are wound on one closed magnetic ring, namely, one closed circular ring can only form one common mode inductor, and the conventional common mode inductor integration method is to assemble a plurality of single common mode inductors in one shell, so that the conventional common mode inductor has poor integration effect, and is overlarge in integration volume and waste in installation space;

finally, in the conventional common mode inductor, because an unavoidable gap exists between the two coils, magnetic leakage is caused, and the filtering effect of the common mode inductor is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the weak point among the prior art, providing one kind and not needing the coiling to can reduce the production degree of difficulty, can integrate a plurality of monomer common mode inductance simultaneously and can reduce integrated volume, can strengthen the common mode inductance of filtering effect moreover.

The purpose of the utility model is realized through the following technical scheme:

a common mode inductor, comprising:

the magnet is provided with a through hole; and

the winding set comprises a limiting block and a plurality of copper foils, limiting steps are arranged on the limiting block, the limiting block is contained in the through hole and abutted against the magnet, the limiting block is respectively penetrated through by each copper foil, and bent parts are respectively arranged at two ends of each copper foil in one of the copper foils.

In one embodiment, a groove is formed in the position, close to the middle, of the limiting block.

In one embodiment, the limiting block is L-shaped.

In one embodiment, the distance between any two adjacent copper foils is equal.

In one embodiment, the magnet is a square magnet, and the through hole is a square through hole.

In one embodiment, the limiting block is a plastic limiting block.

In one embodiment, the copper foil is located at the center of the stopper.

In one embodiment, the outer side wall of the limiting block is tightly attached to the inner side wall of the through hole.

In one embodiment, the number of the copper foils is 2N, and N is a positive integer.

In one embodiment, the number of the copper foils is eight.

Compared with the prior art, the utility model discloses at least, following advantage has:

the utility model discloses a common mode inductance, including magnet and winding external member, the through-hole has been seted up on the magnet, the winding external member includes stopper and a plurality of copper foil, be provided with spacing step on the stopper, the stopper holding is in the through-hole, and spacing step and magnet looks butt, each copper foil wears to establish the stopper respectively, in one of them copper foil, be provided with the kink on the both ends of copper foil respectively, each copper foil wears to establish in the through-hole, consequently, do not need the coiling, thereby can reduce the production degree of difficulty, each copper foil can share the magnet simultaneously, make per two copper foils can form a monomer common mode inductance, consequently can integrate a plurality of monomer common mode inductances and can not obviously increase the volume, and avoided having the magnetic leakage problem that causes because of the clearance between the coil, thereby can strengthen the filtering effect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a common mode inductor according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the common mode inductor shown in FIG. 1;

fig. 3 is a schematic structural diagram of a winding set according to an embodiment of the present invention.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It is noted that as used herein, reference to an element being "connected" to another element also means that the element is "in communication" with the other element, and fluid can be in exchange communication between the two.

Referring to fig. 1, a common mode inductor 10 includes a magnet 100 and a winding set 200, the winding set 200 is used to penetrate the magnet 100, and two ends of the winding set 200 are used to connect to a circuit requiring filtering, thereby the magnet 100 is matched with the winding set 200 to realize the filtering function, the common mode inductor 10 of the utility model, the winding set 200 is directly arranged on the magnet 100, therefore, the winding coil is not needed, thereby reducing the production difficulty and simplifying the production, and meanwhile, the winding set 200 is provided with a plurality of copper sheets which share the magnet 100, i.e. a plurality of single common mode inductors are integrated, and the volume is smaller than the volume of the common mode inductor which is wound by the enameled wire, and in addition, because the coil filtering is not used, therefore, the problem of magnetic flux leakage caused by the gap between the coils is avoided, and the filtering effect is effectively enhanced.

Referring to fig. 1 and 2, a through hole 110 is formed in the magnet 100, the winding set 200 includes a limiting block 210 and a plurality of copper foils 220, a limiting step 211 is disposed on the limiting block 210, the limiting block 210 is accommodated in the through hole 110, the limiting step 211 abuts against the magnet 100, each copper foil 220 respectively penetrates through the limiting block 210, and in one of the copper foils 220, two ends of each copper foil 220 are respectively provided with a bending portion 221.

It should be noted that the magnet 100 is provided with a through hole 110, in one embodiment, the magnet 100 is a square magnet, the through hole 110 is a square through hole, and the stopper 210 is accommodated in the through hole 110, in one embodiment, the stopper 210 is also square, and the outer side wall of the stopper 210 is closely attached to the inner side wall of the through hole 110, so that the stopper 210 and the magnet 100 can be fixed together, and the looseness between the stopper 210 and the magnet 100 due to the existence of a gap is prevented, and further, the stopper 210 is provided with a stopper step 211, and when the stopper 210 is inserted into the through hole 110, and the limit block 210 is pushed to the end, the limit step 211 of the limit block 210 will abut against the position of the magnet 100, therefore, the limiting block 210 is clamped by the magnet 100, and it should be noted that at this time, the other end surface of the limiting block 210 far away from the limiting step 211 is flush with the side wall of the magnet 100; further, each copper foil 220 is respectively inserted through the limit block 210, specifically, each copper foil 220 is inserted through the limit step 211 arranged on the limit block 210, in an embodiment, the limit block 210 is a plastic limit block, each copper foil 220 and the limit block 210 are tightly fixed, specifically, the limit block 210 and each copper foil 220 are integrally injection-molded, so that the firmness between each copper foil 220 and the limit block 210 can be effectively increased; further, each copper foil 220 passes through the limiting block 210, and the limiting block 210 is accommodated in the through hole 110, so that each copper foil 220 passes through the through hole 110, that is, each copper foil 220 passes through the magnet 100, wherein each copper foil 220 corresponds to a winding, so that each two copper foils 220 can form a single common mode inductor, and a plurality of copper foils 220 can form a plurality of common mode inductors, that is, one magnet 100 is shared by a plurality of single common mode inductors, in an embodiment, the number of the copper foils 220 is 2N, N is a positive integer, for example, eight copper foils 220 are provided, that is, four single common mode inductors are integrated, so that an even number of copper foils 220 are provided to ensure that all the copper foils 220 can form a group of two, so that each group can form a plurality of single common mode inductors, the purpose of integrating a plurality of single common mode inductors is achieved, and conventional winding is avoided, therefore, the volume of the integrated common mode inductor 10 can be more compact, the assembly and production difficulty is reduced, and the problem of magnetic flux leakage caused by gaps among the windings is solved; further, copper foil 220 is also equivalent to the pin of integrated common mode inductor 10, and in one embodiment, the utility model discloses a common mode inductor 10 is for pasting formula common mode inductor 10, consequently sets up kink 221 respectively at the both ends of copper foil 220 for copper foil 220 both ends can be hugged closely and externally the circuit board is installed.

Referring to fig. 3, in one embodiment, a groove 212 is formed on the stopper 210 near the middle. It should be noted that, at the middle position department of stopper 210, and be located the bottom side of stopper 210, set up recess 212, it should be noted that each copper foil 220 can wear to establish recess 212, through set up recess 212 on stopper 210, can alleviate stopper 210's weight, thereby make the utility model discloses a common mode inductance 10 weight is littleer.

Referring again to fig. 2, in one embodiment, the stopper 210 is L-shaped. It should be noted that the limiting block 210 is provided with a limiting step 211, so that the side surface of the limiting block 210 is L-shaped, the copper foil 220 penetrates through the limiting step 211 because the copper foil 220 penetrates through the limiting block 210, and the position of the limiting step 211 is L-shaped, so that the copper foil 220 is also L-shaped at the position of the limiting step 211; further, in order to facilitate the insertion of the stopper 210 into the magnet 100, in an embodiment, the end of the copper foil 220 away from the stopper step 211 is kept in a vertical state before being inserted into the magnet 100, that is, before the stopper 210 is inserted into the through hole 110, the end of the copper foil 220 away from the stopper step 211 is not bent yet to form the bent portion 221, so as to facilitate the installation of the stopper 210 into the magnet 100, and in an embodiment, two bent portions 221 are provided at any end of the copper foil 220, so that the end of the copper foil 220 can be mounted on an external circuit board.

In an embodiment, the distance between any two adjacent copper foils 220 is equal, and therefore, each copper foil 220 is distributed in a row, which is beneficial to fixing each copper foil 220 and the limiting block 210 together, i.e. is beneficial to production and processing, and is more beautiful, and on the other hand, each copper foil 220 is distributed in a row, and each two copper foils 220 form a single common mode inductor, so that interference of each single common mode inductor can be avoided, and the filtering efficiency of each single common mode inductor can be improved.

Referring again to fig. 2, in one embodiment, the copper foil 220 is located at the center of the stopper 210. It should be noted that, the copper foil 220 is located at the central position of the limiting block 210, when the limiting block 210 is inserted into the through hole 110, a distance between the upper surface of the copper foil 220 and the upper sidewall of the through hole 110 is H, and a distance between the lower surface of the copper foil 220 and the lower sidewall of the through hole 110 is D, which enable H and D to be equal, so that the copper foil 220 is located at the central position of the magnet 100, thereby effectively improving the filtering effect of the common mode inductor 10.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A common mode inductor, comprising:

the magnet is provided with a through hole; and

2. A common-mode inductor according to claim 1, wherein the position of the limiting block near the middle is provided with a groove.

3. A common-mode inductor according to claim 1, characterized in that the limiting blocks are L-shaped.

4. A common-mode inductor according to claim 1, characterized in that the distance between any two adjacent copper foils is equal.

5. A common-mode inductor according to claim 1, wherein the magnet is a square magnet and the through hole is a square through hole.

6. A common-mode inductor according to claim 1, wherein the stopper is a plastic stopper.

7. A common-mode inductor according to claim 1, characterized in that the copper foil is located at the center of the stopper.

8. The common mode inductor according to claim 1, wherein an outer sidewall of the stopper is closely attached to an inner sidewall of the through hole.

9. A common-mode inductor according to claim 1, characterized in that the number of copper foils is 2N, N being a positive integer.

10. A common-mode inductor according to claim 9, characterized in that the number of copper foils is eight.