CN211208140U - SMD common mode inductor of self-adhesion lid - Google Patents

Abstract

The utility model discloses a SMD common mode inductance of self-adhesion lid relates to the common mode inductance field. It includes the magnetic core body and winds the copper line winding of establishing on the magnetic core body, the magnetic core body includes the terminal board of two relative settings and connects two parallel magnetic cores side by side of fixing between two terminal boards and winds the post, the copper line winding includes two sets of copper line coils, the coiling is respectively on the cylinder of corresponding magnetic core around the post, the terminal board is equipped with two soldering tin recesses on being used for the installation face that is connected with electronic circuit board, the end of a thread of two sets of copper line coils of copper line winding is fixed in the soldering tin recess that corresponds through the soldering tin electrode respectively, the soldering tin recess is "V" type structure, its groove diapire is circular arc transitional coupling, the magnetic core winds the post and has at least two adjacent edges to be provided with "C" type chamfer faces that extend along this edge in its cylinder length direction's four edges, the terminal board is. The utility model discloses a structural strength is high, and the shock resistance is strong, easily production and processing.

Description

SMD common mode inductor of self-adhesion lid

Technical Field

The utility model relates to a common mode inductance technical field, concretely relates to copper line damage is low, the SMD common mode inductance of self-adhesion lid that production equipment is convenient.

Background

Common mode inductors, also called common mode chokes, are commonly used in switching power supplies of computers to filter common mode electromagnetic interference signals. In the design of the board card, the common mode inductor is installed on the board card to play a role in EMI (electromagnetic interference) filtering, can effectively inhibit electromagnetic waves generated by the high-speed signal line from radiating and emitting outwards, and is widely used in various electronic fields. Current common mode inductance adopts the pin terminal of plug-in type mostly, and production and processing is comparatively troublesome, and four edges that the magnetic core wound the post are the right angle edge, and at the wire winding in-process, this right angle edge causes the string wound to the copper line that the surface coat plated insulating paint easily.

SUMMERY OF THE UTILITY MODEL

In order to solve the defect that above-mentioned technique exists, the utility model provides a copper line damage is low, the convenient SMD common mode inductance of self-adhesion lid of production equipment.

The utility model discloses realize that the technical scheme that above-mentioned technological effect adopted is:

a self-adhesive cover patch type common mode inductor comprises a magnetic core body and copper wire windings wound on the magnetic core body, wherein the magnetic core body comprises two oppositely arranged terminal boards and two parallel magnetic core winding columns connected and fixed between the two terminal boards, the copper wire windings comprise two groups of copper wire coils which are wound on corresponding columns of the magnetic core winding columns respectively, two soldering tin grooves are arranged on mounting surfaces of the terminal boards used for being connected with an electronic circuit board, wire ends of the two groups of copper wire coils of the copper wire windings are fixed in the corresponding soldering tin grooves respectively through soldering tin electrodes, the soldering tin grooves are of a V-shaped structure, the bottom wall of each groove is in arc transition connection, at least two adjacent edges of the four edges of the magnetic core winding column in the length direction of the column body are provided with C-shaped chamfer surfaces extending along the edges, the terminal board is provided with a self-adhesive cover patch on one side deviating from the mounting surface.

Preferably, in the common mode inductor with a surface mount type self-adhesive cover, the two end portions of the magnetic core winding column are provided with circular arc transitional connection surfaces at the connection positions with the inner side surfaces of the terminal boards at the corresponding ends, and the outer circumferential edges of the circular arc transitional connection surfaces are located outside the end edges of the magnetic core winding column.

Preferably, in the common mode inductor with a surface mount type self-adhesive cover, an end silver electroplating structure is disposed in the solder groove.

Preferably, in the above common mode inductor with a self-adhesive cover in a surface mount manner, the end silver electroplating structure includes a silver plating layer, a nickel plating layer and a tin plating layer which are sequentially electroplated on a groove wall of the soldering tin groove from inside to outside.

Preferably, in the common mode inductor with a self-adhesive cover mounted thereon, the outer side surface of the terminal plate is further provided with an outer tin-plated surface extending outward along a groove edge of the solder groove at a position corresponding to the solder groove.

Preferably, in the common mode inductor with a surface mount type self-adhesive cover, a spacing distance is provided between the two solder recesses, the solder recesses on the two terminal boards are arranged in a pairwise symmetry manner, and two ends of two groups of copper coils of the copper wire winding are respectively welded in the solder recesses at two ends of the corresponding magnetic core winding column.

Preferably, in the common mode inductor with a surface mount type self-adhesive cover, the soldering tin electrodes in the four soldering tin grooves are polished to be flat on electrode welding surfaces welded with the electronic circuit board through hot pressing, and are located on the same horizontal plane.

Preferably, in the above-described common mode inductor of a self-adhesive cover patch type, the terminal plate is integrally formed with the core winding post.

Preferably, in the common mode inductor with a self-adhesive cover, the terminal board is made of ferrite, and the magnetic core winding post is made of the terminal board made of ferrite.

Preferably, in the common mode inductor with a self-adhesive cover, the self-adhesive cover is a film, and an adhesive surface of the film is coated with an adhesive.

The utility model has the advantages that: the utility model discloses a SMD common mode inductance of self-adhesion lid is through setting up "C" type chamfer face that extends along this edge on the magnetic core around two at least adjacent edges of post for copper coil can not be scraped at this department when dragging the coiling and decreases, can protect copper coil's insulating coating effectively not receive the damage, has reduced the defective rate by a wide margin. Meanwhile, the bottom wall of the soldering tin groove is in arc transition connection, and the magnetic core is in arc transition connection with the connection part of the two end parts of the winding column and the inner side surface of the terminal board, so that the insulating paint skin scraping damage caused by pulling during winding and welding of the copper wire coil can be further reduced. Moreover, the connecting surfaces of the magnetic core winding columns and the inner side surfaces of the terminal plates are in arc transition connection, so that the connecting area of the magnetic core winding columns and the inner side surfaces of the terminal plates is increased, and the structural strength of integrated connection is increased. The end silver electroplating structure in the soldering tin recess also makes copper coil's end of a thread change in the welding, and the soldering tin electrode changes in the soldering tin shaping, makes the utility model discloses change in the production and processing. In addition, the self-adhesive cover patch can be directly adhered to the terminal board, so that the adhesive dispensing and fixing procedures are omitted, and compared with the common-mode inductor with the plastic cover, the improved structure further simplifies the production process and is easier to produce and process.

Drawings

Fig. 1 is a schematic perspective view of a common mode inductor of the present invention with its mounting surface facing upward;

fig. 2 is an exploded view of the magnetic core and the self-adhesive cover patch of the present invention;

FIG. 3 is a schematic layered view of a silver-terminated electroplating structure on a magnetic core body according to the present invention;

fig. 4 is a schematic top view of the common mode inductor according to the present invention;

fig. 5 is a schematic cross-sectional view of a magnetic core winding post of the present invention;

FIG. 6 is a cross-sectional view of the magnetic core of the present invention at the junction of the end of the winding post and the inner side of the terminal plate;

fig. 7 is a schematic diagram of a state of the copper wire coil of the present invention during winding.

Detailed Description

For a further understanding of the invention, reference is made to the following description taken in conjunction with the accompanying drawings and specific examples, in which:

in the description of the present application, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it should be further noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, a connection through an intermediate medium, and a connection between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to specific circumstances.

As shown in fig. 1 to fig. 3, an embodiment of the present invention provides a self-adhesion cover patch type common mode inductor, which includes a core body 1 and a copper wire winding 2 wound on the core body 1. The core body 1 includes two oppositely disposed terminal plates 11 and two parallel and parallel core winding posts 12 connected and fixed between the two terminal plates 11. The copper wire winding 2 comprises two groups of copper wire coils, wherein the copper wire coils are plated with insulating varnish and respectively wound on the corresponding magnetic core winding columns 12. Wherein, as the utility model discloses an improve, be equipped with two soldering tin recesses 112 on the installation face 111 of terminal block 11, this installation face 111 is used for being connected with electronic circuit board, and the junction adopts the bonding glue to bond fixedly. The wire ends of two groups of copper wire coils of the copper wire winding 2 are respectively fixed in the corresponding soldering tin grooves 112 through soldering tin electrodes 5, the soldering tin electrodes 5 are electrodes formed through soldering tin, and after forming, the electrode welding surfaces 51 are subjected to hot pressing, flattening and polishing to form smooth and flat surfaces. As shown in fig. 3, the solder recess 112 has a "V" shape, and the bottom wall of the groove is connected by a circular arc transition. As shown in fig. 5, at least two adjacent edges of the four edges of the core-wound pole 12 in the longitudinal direction of the pole body are provided with "C" -shaped chamfered surfaces 121 extending along the edges. The C-shaped chamfer surface prevents the copper wire coil from being scratched and damaged at the position when the copper wire coil is pulled and wound, can effectively protect the insulating varnish of the copper wire coil from being damaged, and greatly reduces the defective rate. Meanwhile, the bottom wall of the soldering tin groove is in arc transition connection, so that the scraping loss of the insulating paint skin caused by pulling during the winding and welding of the copper wire coil can be further reduced. The terminal board 11 is provided with a self-adhesive cover patch 4 on the side away from the mounting surface 111, and the self-adhesive cover patch 4 is a film, the adhesive surface of which is coated with adhesive glue and can be directly adhered to the terminal board 11 during production and processing.

Specifically, in the preferred embodiment of the present invention, as shown in fig. 3 and 6, the magnetic core is provided with the circular arc transitional connection surface 122 around the two end portions of the column 12 at the connection with the inner side surface of the terminal plate 11 at the corresponding end, and the peripheral edge 1221 of the circular arc transitional connection surface 122 is located outside the end edge of the magnetic core around the column 12. The magnetic core adopts circular arc transition connection face 122 to increase both connection areas around the junction of the both ends of post 12 and the medial surface of terminal block 11, has increased the structural strength that the integral type is connected, because of the utility model discloses a common mode inductance is generally applied to on the mainboard of on-vehicle control computer, consequently, in the face of frequently being in under mechanical vibration's the operating mode, its structural strength is very necessary to be strengthened. Connect the magnetic core that face 122 increases through this circular arc transition and can prevent the structural fracture well around being connected the area between post 12 and the terminal block 11, practice proves, compare the common mode inductance of no circular arc transition connection face, the utility model discloses a common mode inductance's structural strength has obtained showing the reinforcing, and under equal operating mode operating condition, its antidetonation effect is showing. In addition, when the end of the copper wire coil is led into the corresponding soldering tin groove 112, the circular arc transition connection surface 122 at the connection position of the two end parts of the magnetic core winding column 12 and the inner side surface of the terminal board 11 can better protect the led-in copper wire part from being scratched, the attaching degree of the copper wire coil is better, and a right-angle wire cannot be formed.

Further, in the preferred embodiment of the present invention, as shown in fig. 2, the end silver electroplating structure 3 is disposed in the soldering tin groove 112, and the end silver electroplating structure 3 can facilitate the soldering tin formation of the soldering tin electrode 5, so that the adhesion of the wire end of the copper wire coil after welding is firmer. Specifically, as shown in fig. 3, the end silver plating structure 3 includes a silver plating layer 31, a nickel plating layer 32, and a tin plating layer 33 plated on the groove wall of the solder groove 112 in this order from inside to outside. The outer surface of the terminal plate 11 is further provided with an outer tin-plated surface 34 extending outward along the groove edge of the solder groove 112 at a position corresponding to the solder groove 112, thereby further increasing the welding area between the solder electrode 5 and the solder groove 112.

Further, in the preferred embodiment of the present invention, as shown in fig. 4, there is a spacing distance "C" between two soldering tin grooves 112, two soldering tin grooves 112 on two terminal boards 11 are symmetrically arranged, and two ends of two sets of copper wire coils of the copper wire winding 2 are respectively soldered in the two ends soldering tin grooves 112 of the corresponding magnetic core winding post 12. The separation distance "C" is equal to the length "a" of the tip outside of each of the two solder recesses 112. The soldering tin electrodes 5 in the four soldering tin grooves 112 are flatly polished to be flat on the electrode welding surfaces 51 welded with the electronic circuit board through hot pressing and are positioned on the same horizontal plane, so that the surface flatness of the electrode welding surfaces 51 of the four soldering tin electrodes 5 is ensured, the coplanarity of the electrode welding surfaces is ensured, and the electrode welding surfaces can be better arranged on the electronic circuit board.

In a preferred embodiment of the present invention, the terminal plate 11 and the magnetic core are integrally formed around the post 12. The terminal plate 11 is a terminal plate made of ferrite, and the core winding post 12 is a terminal plate made of ferrite.

In the preferred embodiment of the present invention, as shown in fig. 7, the state of the copper wire coil during winding is schematically illustrated. The orientation of the circular arc transition connection surface 122 on the four edges of the core winding leg 12 determines the winding pattern of the copper wire coil, and the winding is performed from the edges to the circular arc transition connection surface 122 during winding. The copper wire needs to be tensioned every time the copper wire is wound for one circle, so that the stress point of the copper wire is located on the circular arc transition connecting surface 122 when the copper wire is tensioned, and the wire is prevented from being cut by a sharp edge in the pulling process. As shown in the winding diagram of fig. 7, two circular arc transition connection surfaces 122 are located on two adjacent edges of the core winding post 12 on the side of the cylindrical surface facing the mounting surface 111 of the common mode inductor. During the wire winding, from the B end toward D end direction coiling coil number of turns in proper order, the copper line just has got anticlockwise to wind the direction and encircles on magnetic core winding post 12, the end of a thread of copper line just has got to pass at the last plane that deviates from installation face 111 one side from magnetic core winding post 12, the centre is through two magnetic cores middle clearance position around post 12, the lower terminal surface that winds post 12 is being followed to the magnetic core out of winding, then use a pulling force tensioning to the copper line toward the top of inclining, the stress surface just is in circular arc transition and connects on face 122 like this, the copper line is at taut in-process, its wire rod surface is connected the face 122 contact with circular arc transition, can avoid sharp right angle edge to cause the incised wound to the wire rod.

To sum up, the utility model discloses a SMD common mode inductance of self-adhesion lid is through setting up "C" type chamfer face that extends along this edge on the magnetic core around two at least adjacent edges of post for copper coil can not be scraped the damage in this department when dragging the coiling, can protect copper coil's insulating coating effectively not to receive the damage, has reduced the defective rate by a wide margin. Meanwhile, the bottom wall of the soldering tin groove is in arc transition connection, and the magnetic core is in arc transition connection with the connection part of the two end parts of the winding column and the inner side surface of the terminal board, so that the insulating paint skin scraping damage caused by pulling during winding and welding of the copper wire coil can be further reduced. Moreover, the connecting surfaces of the magnetic core winding columns and the inner side surfaces of the terminal plates are in arc transition connection, so that the connecting area of the magnetic core winding columns and the inner side surfaces of the terminal plates is increased, and the structural strength of integrated connection is increased. The end silver electroplating structure in the soldering tin recess also makes copper coil's end of a thread change in the welding, and the soldering tin electrode changes in the soldering tin shaping, makes the utility model discloses change in the production and processing. In addition, the self-adhesive cover patch can be directly adhered to the terminal board, so that the adhesive dispensing and fixing procedures are omitted, and compared with the common-mode inductor with the plastic cover, the improved structure further simplifies the production process and is easier to produce and process.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, but rather is described in the foregoing embodiments and the description with reference to the principles of the invention and that various changes and modifications may be made without departing from the spirit and scope of the invention, and it is intended that all such changes and modifications fall within the scope of the invention as claimed, which is defined by the claims appended hereto and their equivalents.

Claims (10)

1. A self-adhesive cover patch type common mode inductor comprises a magnetic core body (1) and a copper wire winding (2) wound on the magnetic core body (1), wherein the magnetic core body (1) comprises two oppositely arranged terminal boards (11) and two parallel magnetic core winding columns (12) connected and fixed between the two terminal boards (11), the copper wire winding (2) comprises two groups of copper wire coils which are respectively wound on corresponding columns of the magnetic core winding columns (12), the common mode inductor is characterized in that the terminal boards (11) are provided with two soldering tin grooves (112) on a mounting surface (111) for being connected with an electronic circuit board, the wire ends of the two groups of copper wire coils of the copper wire winding (2) are respectively fixed in the corresponding soldering tin grooves (112) through soldering tin electrodes (5), the soldering tin grooves (112) are of a V-shaped structure, and the bottom wall of the grooves are in arc transition connection, at least two adjacent edges of four edges of the magnetic core winding column (12) in the length direction of the column body are provided with C-shaped chamfer surfaces (121) extending along the edges, and the side of the terminal board (11) departing from the mounting surface (111) is provided with a self-adhesive cover patch (4).

2. The self-adhesive cover patch-type common-mode inductor according to claim 1, wherein the two end portions of the magnetic core winding column (12) are provided with circular arc transition connection surfaces (122) at the connection with the inner side surfaces of the terminal boards (11) at the corresponding ends, and the outer circumferential edges (1221) of the circular arc transition connection surfaces (122) are located outside the end edges of the magnetic core winding column (12).

3. The common-mode inductor in patch type with self-adhesive cover according to claim 1 or 2, wherein the solder recess (112) is provided with a terminal silver plating structure (3).

4. The common mode inductor of claim 3, wherein the terminal silver plating structure (3) comprises a silver plating layer (31), a nickel plating layer (32) and a tin plating layer (33) plated on the wall of the solder recess (112) from inside to outside in sequence.

5. The common-mode inductor of self-adhesive cover patch type according to claim 4, wherein the outer side surface of the terminal plate (11) is further provided with an outer tin-plated surface (34) extending along the groove edge of the solder groove (112) in an outward spreading manner at a position corresponding to the solder groove (112).

6. The common-mode inductor of claim 1, characterized in that there is a spacing distance between two solder recesses (112), the solder recesses (112) on the two terminal boards (11) are arranged symmetrically in pairs, and two ends of two sets of copper coils of the copper winding (2) are soldered into the solder recesses (112) on two ends of the corresponding magnetic core winding posts (12).

7. The common-mode inductor of claim 1, wherein the solder electrodes (5) in the four solder recesses (112) are ground to be flat and located on the same horizontal plane at the electrode soldering surface (51) to be soldered to the electronic circuit board by thermocompression planarization.

8. The common-mode inductor of claim 1, wherein the terminal plate (11) is integrally formed with the core winding post (12).

9. The common-mode inductor of claim 1, wherein the terminal plate (11) is a ferrite terminal plate, and the magnetic core winding post (12) is a ferrite terminal plate.

10. The common-mode inductor with self-adhesive cover patch according to claim 1, wherein the self-adhesive cover patch (4) is a film, and the adhesive surface thereof is coated with adhesive glue.

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