CN113130185A

CN113130185A - Inductor

Info

Publication number: CN113130185A
Application number: CN202110551807.4A
Authority: CN
Inventors: 陈阳; 郭雄志; 王国华; 伍卓权; 肖强; 张云帆; 蒋枝航; 王伯辉; 周永利
Original assignee: Chengdu Platinum New Material Technology Co ltd; Heyuan Boke New Material Co ltd; Huizhou Boke Industry Co ltd; SHENZHEN POCO MAGNETIC CO Ltd; Poco Holding Co ltd
Current assignee: Chengdu Platinum New Material Technology Co ltd; Heyuan Boke New Material Co ltd; Huizhou Boke Industry Co ltd; SHENZHEN POCO MAGNETIC CO Ltd; Poco Holding Co ltd
Priority date: 2021-05-20
Filing date: 2021-05-20
Publication date: 2021-07-16

Abstract

The invention belongs to the technical field of electronic devices, and particularly discloses an inductor which comprises a coil and a magnetic core, wherein the coil comprises a bending part which is integrally formed by stamping and is in a flat polygonal shape, and welding feet extending out of two ends of the bending part, the bending part is wrapped in the magnetic core, the two welding feet are exposed out of the side wall of the magnetic core after being bent, and a polygonal through hole is arranged in the middle of the bending part in a penetrating mode. With the inductor of this structural design, can promote the effective sectional area of coil through the flat coiling of coil, then make full use of the finite space of magnetic core, realized lower inductance internal resistance under the equal volume, when effectively having promoted the performance of inductor, also make the inductor stable in structure after the suppression reliable, difficult fracture.

Description

Inductor

Technical Field

The invention relates to the technical field of electronic devices, in particular to an inductor.

Background

The inductor is one of the commonly used components in the circuit, and is classified according to the winding structure: single layer coils, multilayer coils, honeycomb coils. With the development of high efficiency and miniaturization of electronic products, the manufacturing process of the existing multilayer coil inductor is provided. The terminal made of the round wire has the following problems in the miniaturization of the inductor:

1. during compression molding, cracks are easily generated inside, the coil is easily deformed, and the product yield is reduced;

2. the outer electrode adopts the process of welding electrode plates, so that a miniaturized product is not easy to manufacture, and the cost is higher;

3. the end face pole wire leading-out process is adopted, the contact area of the led-out pole wire and the external electrode is small, so that the contact resistance is increased, the cost is high, and the utilization space of the magnet is low.

Disclosure of Invention

The invention aims to provide an inductor, which can effectively improve the performance of the inductor while fully utilizing the limited magnetic core space, and ensure that the pressed inductor has a stable and reliable structure and is not easy to crack.

In order to achieve the purpose, the invention adopts the following technical scheme:

the coil comprises a bending part which is integrally formed by punching and is in a flat polygonal shape, and welding feet extending out of two ends of the bending part, the bending part is wrapped in the magnetic core, the two welding feet are exposed out of the side wall of the magnetic core after being bent, and a polygonal through hole is arranged in the middle of the bending part in a penetrating mode.

The coil comprises a first connecting wall, a second connecting wall, a third connecting wall and a fourth connecting wall, wherein the first connecting wall is longitudinally arranged, the second connecting wall is transversely arranged at the tail end of the first connecting wall, the third connecting wall is longitudinally arranged at the tail end of the second connecting wall, and the fourth connecting wall is transversely arranged at the tail end of the third connecting wall.

The welding feet are respectively arranged at the head end of the first connecting wall and the tail end of the fourth connecting wall.

Wherein the first connecting wall and the third connecting wall are both arranged on the same side of the second connecting wall.

The third connecting wall is obliquely provided with a crease, and the first connecting wall and the fourth connecting wall of the coil bent along the crease are arranged along the same straight line direction.

The bent portion is formed by the tail end of the first connecting wall, the head end of the fourth connecting wall, the second connecting wall and the bent third connecting wall.

Wherein, the leg with first connecting wall with the integrative stamping forming of fourth connecting wall, and two the width of leg is greater than corresponding respectively first connecting wall with the width of fourth connecting wall.

Wherein, the relative both sides wall at first connecting wall afterbody and the relative both sides wall of the head end of first connecting wall are non-coplanar.

And two opposite side walls at the head end of the fourth connecting wall and two opposite side walls at the tail end of the fourth connecting wall are arranged in a non-coplanar manner.

The invention has the beneficial effects that: the invention discloses an inductor which comprises a coil and a magnetic core, wherein the coil comprises a bending part which is formed by integral punching and is arranged in a flat polygonal shape, and welding feet extending out of two ends of the bending part, the bending part is wrapped in the magnetic core, the two welding feet are exposed out of the side wall of the magnetic core after being bent, and a polygonal through hole is arranged in the middle of the bending part in a penetrating mode. With this structural design's inductor, can effectively promote the effective sectional area of coil through the flat coiling of coil, then make full use of the finite space of magnetic core, realized lower inductance internal resistance under the equal volume, when effectively having promoted the performance of inductor, also make the inductor stable in structure after the suppression reliable, difficult fracture.

Drawings

Fig. 1 is a plan view of the coil in this embodiment after being unwound.

Fig. 2 is a plan view of the coil of this embodiment after being bent.

Fig. 3 is an exploded view of the inductor provided in the present embodiment.

Fig. 4 is an isometric view of the inductor provided in this embodiment.

In the figure:

1. a coil; 11. a bending part; 12. a through hole; 13. a first connecting wall; 14. a second connecting wall; 15. a third connecting wall; 151. folding; 16. a fourth connecting wall; 17. welding feet; 2. a magnetic core.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Fig. 1 is a plan view of a coil 1 in the present embodiment after being unfolded, fig. 2 is a plan view of the coil 1 in the present embodiment after being folded, fig. 3 is an exploded view of an inductor provided in the present embodiment, and fig. 4 is an isometric view of the inductor provided in the present embodiment; with reference to fig. 1 to 4, the inductor provided in this embodiment can effectively utilize the limited space of the magnetic core through the flat winding of the coil 1, thereby achieving lower inductance internal resistance under the same volume, effectively improving the performance of the inductor, and simultaneously making the pressed inductor have a stable and reliable structure and less cracking.

Specifically, as shown in fig. 1 to 4, the inductor in the present embodiment is composed of two parts, i.e., a coil 1 and a magnetic core 2, wherein the magnetic core 2 in the present embodiment is configured as a dust core. More specifically, the magnetic core 2 is formed by compression molding of soft magnetic powder and a binder. Here, the soft magnetic powder contained in the core 2 is made of an iron-based alloy, ferrite, or the like subjected to an insulating treatment. However, the magnetic core 2 of the present invention is not limited to this, and may be manufactured by a manufacturing method such as bonding a plurality of magnetic materials with an adhesive, for example.

Further, in the present embodiment, the coil 1 covered in the magnetic core 2 is formed by integrally stamping a copper plate, the bent portion 11 of the bent coil 1 is disposed in a flat polygonal shape, preferably, the middle portion of the bent portion 11 is provided with a polygonal through hole 12 in a penetrating manner, the polygonal through hole 12 and the bent portion 11 are both disposed in a quadrangular frame shape, two solder fillets 17 are respectively extended from opposite sides of the bent portion 11, and after the two solder fillets 17 are bent by 180 degrees, the two solder fillets are respectively exposed on the lower bottom surface of the pressed magnetic core 2, so that the bent portion 11 with the structural design is covered by the magnetic core 2 and then pressed into a whole.

The inductor designed by the mode can fully utilize the limited assembly space of the magnetic core 2 through the arrangement of the coil 1, and under certain characteristics, the problem of magnetic core layering is improved, so that the copper loss of a product is greatly reduced, and the temperature rise current of the product is increased.

More specifically, the coil 1 in the present embodiment preferably includes a first connecting wall 13 disposed longitudinally, a second connecting wall 14 disposed transversely at a terminal of the first connecting wall 13, a third connecting wall 15 disposed longitudinally at a terminal of the second connecting wall 14, and a fourth connecting wall 16 disposed transversely at a terminal of the third connecting wall 15, wherein fillets 17 are integrally punched at a head end of the first connecting wall 13 and a terminal of the fourth connecting wall 16, and widths of the two fillets 17 are respectively greater than widths of the corresponding first connecting wall 13 and the corresponding fourth connecting wall 16 and less than or equal to a length or a width of the magnetic core 2.

More specifically, as shown in fig. 2, the first connecting wall 13 and the third connecting wall 15 arranged in the above manner are both arranged on the same side of the second connecting wall 14, and the third connecting wall 15 is obliquely provided with a fold 151, so that the coil 1 arranged in this manner, the first connecting wall 13 and the fourth connecting wall 16 of the coil 1 bent along the fold 151 are arranged along the same straight line direction, the tail end of the first connecting wall 13 and the head end of the fourth connecting wall 16, and the second connecting wall 14 and the bent third connecting wall 15 jointly form the bent portion 11, so that turns of the bent coil 1 are tightly and flatly attached to each other, the effective cross-sectional area of the coil 1 is further increased, and the limited space of the magnetic core 2 is fully utilized.

Furthermore, in the present embodiment, in order to facilitate forming the through hole 12 in the middle of the bent portion 11, as shown in fig. 1 and fig. 2, preferably, the opposite side walls at the end of the first connecting wall 13 and the opposite side walls at the head end of the first connecting wall 13 are disposed in a non-coplanar manner, and the opposite side walls at the head end of the fourth connecting wall 16 and the opposite side walls at the end of the fourth connecting wall 16 are disposed in a non-coplanar manner, so that the through hole 12 formed after bending is wrapped around the magnetic core 2, so as to further increase the contact area between the coil 1 and the magnetic core 2, thereby improving the structural strength of the inductor.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. The inductor is characterized by comprising a coil (1) and a magnetic core (2), wherein the coil (1) comprises a bending part (11) which is integrally formed by punching and is in a flat polygonal shape, and welding feet (17) extending out of two ends of the bending part (11), the bending part (11) is coated in the magnetic core (2), the two welding feet (17) are exposed out of the side wall of the magnetic core (2) after being bent, and a polygonal through hole (12) is arranged in the middle of the bending part (11) in a penetrating mode.

2. An inductor as claimed in claim 1, characterized in that the coil (1) comprises a first connecting wall (13) arranged longitudinally, a second connecting wall (14) arranged transversely to the end of the first connecting wall (13), a third connecting wall (15) arranged longitudinally to the end of the second connecting wall (14), and a fourth connecting wall (16) arranged transversely to the end of the third connecting wall (15).

3. An inductor as claimed in claim 2, characterized in that the first connecting wall (13) and the fourth connecting wall (16) are provided with said solder feet (17) at their head ends and at their tail ends, respectively.

4. An inductor as claimed in claim 2, characterized in that said first connecting wall (13) and said third connecting wall (15) are both arranged on the same side of said second connecting wall (14).

5. An inductor as claimed in claim 2, characterized in that said third connecting wall (15) is provided with a fold (151) at an angle, and said first connecting wall (13) and said fourth connecting wall (16) of said coil (1) after being bent along said fold (151) are provided in the same linear direction.

6. An inductor as claimed in claim 2, characterized in that the end of the first connecting wall (13) and the end of the fourth connecting wall (16), and the second connecting wall (14) and the bent third connecting wall (15) form the bent portion (11).

7. An inductor as claimed in claim 2, characterized in that said solder feet (17) are stamped and formed integrally with said first connecting wall (13) and said fourth connecting wall (16), and in that the width of said solder feet (17) is greater than the width of the corresponding first connecting wall (13) and fourth connecting wall (16), respectively.

8. An inductor as claimed in claim 2, characterized in that opposite side walls of the end of said first connecting wall (13) are disposed non-coplanar with opposite side walls of the head end of said first connecting wall (13).

9. An inductor as claimed in claim 2, characterized in that opposite side walls of a head end of said fourth connecting wall (16) are disposed non-coplanar with opposite side walls of a tail end of said fourth connecting wall (16).