CN116013658A - Integrated inductor, magnet and coil assembly thereof - Google Patents

Abstract

The invention discloses an integrally formed inductor and a magnet and coil assembly thereof, wherein the magnet and coil assembly comprises a magnet and a coil, the magnet comprises a magnetic core center post and a magnetic core blade, the coil is assembled on the magnetic core center post, and two wire tails of the coil are positioned at one end of the magnetic core center post far away from the magnetic core blade; the two wire tails are respectively the wire tail of the high pin lead and the wire tail of the low pin lead, wherein the wire tail of the high pin lead is in an inclined state so that the wire tail of the high pin lead moves along the compression direction during compression molding. According to the integrated inductor, the wire tail of the high-pin lead wire of the coil is arranged in the direction of extending towards the middle column of the T-shaped magnet, namely, away from one end of the magnetic core blade, so that the density of each part of the integrated inductor obtained through processing is close, a cavity cannot appear, the reliability and the stability of a product are ensured, and the problems of howling, cracking and the like generated during application are avoided.

Description

Integrated inductor, magnet and coil assembly thereof

Technical Field

The invention relates to the technical field of electronic components, in particular to an integrally formed inductor.

Background

The integrated inductor is the current inductor industry direction, and is characterized by large current, good magnetic circuit shielding and small loss, and the inductor is manufactured by increasingly adopting an integrated molding method in the field of large current. However, there are some problems in this type of product, for example, the reliability and stability of this type of product need to be improved, and when in use, howling, cracking, and cracking may occur, and improvements are urgently needed to meet the needs of industry development.

Disclosure of Invention

To overcome the foregoing drawbacks of the prior art, embodiments of the present application provide an integrally formed inductor magnet and coil assembly, including a magnet and a coil, the magnet including a core leg and a core blade, the coil being mounted on the core leg, and both wire tails of the coil being at an end of the core leg remote from the core blade;

the two wire tails are respectively the wire tail of the high pin lead and the wire tail of the low pin lead, wherein the wire tail of the high pin lead is in an inclined state so that the wire tail of the high pin lead moves along the compression direction during compression molding.

The invention can also adopt the following optional/preferred schemes:

the tail of the high pin lead is inclined from a preset position, and the preset position is flush with the top surface of the coil or is within an allowable height difference.

The high pin lead is spaced from the outer side of the coil by a predetermined distance such that the high pin lead does not contact the coil during and after press molding.

The magnet is a T-shaped magnet, and the magnetic core center pillar is perpendicular to the magnetic core blade.

The magnetic core center pillar is cylindrical and is arranged in the middle of the magnetic core blade.

The cross section of the magnetic core blade is rectangular.

The invention also provides an integrated inductor which comprises a magnet, a coil assembly, a pressing magnet, a first extraction electrode and a second extraction electrode;

the magnet and coil assembly being as claimed in any one of the preceding claims, located within the compacted magnet;

the tail of the high-pin lead is connected with the first extraction electrode, and the tail of the low-pin lead is connected with the second extraction electrode.

Preferably, the top surfaces of the first extraction electrode and the second extraction electrode are on the same plane.

It is also preferable that the top ends of the first extraction electrode and the second extraction electrode are bent in the same direction.

Compared with the prior art, the one or more technical schemes provided by the embodiment of the application have at least the following beneficial effects:

according to the integrated inductor, the wire tail of the high-pin lead wire of the coil is arranged in the direction of extending towards the middle column of the T-shaped magnet, namely, away from one end of the magnetic core blade, so that the density of each part of the integrated inductor obtained through processing is close, a cavity cannot appear, the reliability and the stability of a product are ensured, and the problems of howling, cracking and the like generated during application are avoided.

Drawings

FIG. 1 is a schematic diagram of a conventional integrally formed inductor in a perspective view;

fig. 2 is a schematic structural view of a conventional integrally formed inductor magnet and coil assembly;

fig. 3A is a schematic diagram of a perspective view of an integrally formed inductor (prior to press forming) according to an embodiment of the present application.

Fig. 3B is a schematic perspective view of the structure of fig. 3A at a certain point in the press forming process.

Fig. 3C is a schematic perspective view of the pressed structure of fig. 3A.

Detailed Description

In order to solve the problems that the reliability and stability of the traditional integrated inductor product are poor, howling, cracking and the like can be generated during application, the embodiment of the invention provides an integrated inductor magnet and coil assembly, which comprises a magnet and a coil, wherein the magnet comprises a magnetic core center post and a magnetic core blade, the coil is assembled on the magnetic core center post, and two wire tails of the coil are positioned at one end of the magnetic core center post far away from the magnetic core blade; the two wire tails are respectively the wire tail of the high pin lead and the wire tail of the low pin lead, wherein the wire tail of the high pin lead is in an inclined state so that the wire tail of the high pin lead moves along the compression direction during compression molding. The integrated inductor product obtained by adopting the magnet and the coil component through compression molding can achieve the effect of improving the reliability and the stability, and can avoid the problems of howling, cracking and the like during application.

In order that the above-recited aspects of the invention may be better understood, a further description of the invention will be rendered by reference to specific embodiments thereof which are appended drawings, wherein like reference numerals refer to like parts unless otherwise specified. It should be emphasized that the following description is merely exemplary in nature and is in no way intended to limit the scope of the invention or its applications. The background section of the present invention may contain background information about the problems or environments of the present invention and is not necessarily descriptive of the prior art. Accordingly, inclusion in the background section is not an admission of prior art by the applicant.

As shown in fig. 1-2, the existing integrated inductor structure is generally that the coil lead wire is led to the lower part of the T-shaped magnetic body bottom plate, so that the problem of insufficient molding density under the high lead wire can occur when a product with a high height (for example, more than 1.5 mm) is molded, even a "cavity" phenomenon occurs, and the reason is found by intensive research as follows:

1. the compression ratio of the powder under the high-level lead is determined by the deformation amount of the coil, but the compression ratio corresponding to the deformation amount of the coil is far smaller than the compression ratio corresponding to the density of the powder pressed from a loose state, so that the density of the powder under the pressed high-level lead is lower than that of other parts.

2. In the pressing process, powder around the coil can flow and fill to ensure that the density of each part is equivalent, but the lower part of the high-level lead is blocked by the lead, the fluidity is relatively poor, the lower part is mainly filled with powder, and the powder filled with the flowing powder is supplemented, so that a cavity is easily formed at the part, namely, the density is insufficient. According to the integrated inductor, the density of each part of the integrated inductor obtained through processing is close, and a cavity cannot appear, so that the reliability and stability of a product are guaranteed, and the problems of howling, cracking and the like generated during application are avoided.

The embodiment of the invention adopts a structural mode that the tail of the high-pin lead wire of the coil is oriented to the extending direction of the T-shaped magnet center pillar (namely, is far away from one end of the magnetic core blade), so that the lower part of the tail of the high-pin lead wire is not shielded, and the tail of the high-pin lead wire before pressing is in an inclined state, so that the tail of the wire moves towards the compression direction along with the movement of a die during pressing, the powder below the high-pin lead wire has sufficient compression ratio, and the density of the powder is close to that of other parts (only limited to a non-magnet structure), thereby avoiding the occurrence of the phenomenon of 'hollowness'. An embodiment of the present invention will be described in further detail with reference to fig. 3.

An integrated magnet and coil assembly for inductor, as shown in fig. 3A (for easy understanding, the powder to be pressed and formed, i.e. the peripheral cubic structure is shown in the figure), comprises a magnet 10 and a coil 20, wherein the magnet 10 comprises a core middle post 11 and a core blade 12, the coil 20 is assembled on the core middle post 11, and two wire tails of the coil 20 are positioned at one end of the core middle post 11 far away from the core blade. The two wire tails are a wire tail 21 of the high pin lead and a wire tail 22 of the low pin lead respectively, wherein at least the wire tail 21 of the high pin lead is in an inclined state so that the wire tail 21 of the high pin lead moves along the compression direction during compression molding. Specifically, the tail 21 of the high-pin lead is inclined from a predetermined position, which is preferably flush with the top surface of the coil 20 or within an allowable height difference of ±0.3mm. In addition, the high pin leads extend upward from the bottom of the coil 20 at a predetermined distance from the outside of the coil 20, the predetermined distance being such that the high pin leads do not contact the coil 20 during and after press molding. The magnet 10 is preferably a T-shaped magnet, and the core center leg 11 and the core blade 12 are perpendicular to each other. In this embodiment, the core leg 11 is further preferably cylindrical, the core blade 12 is preferably rectangular in cross section, and the core leg 11 is provided in the middle of the core blade 12.

In the integrally molded inductor magnet and coil assembly of the present embodiment, during the process of being placed in a mold and filled with powder for compression molding, the tail 21 of the high pin lead is moved in the compression direction to be deformed into the state shown in fig. 3B first, i.e., the tail 21 of the high pin lead is further inclined from a predetermined portion toward the top of the coil 20 (while the powder to be compression molded is compressed to some extent, i.e., the height of the peripheral cubic structure is reduced), until the end of compression molding is brought into the state shown in fig. 3C, i.e., the tail 21 of the high pin lead is parallel or coplanar with the top surface of the coil 20 to be connected with the extraction electrode. In the above compression molding process, the wire tail 21 of the high pin lead wire is displaced by a larger distance from the original inclined state to the final parallel or coplanar state with the top surface of the coil 20, so that the powder below the wire tail is sufficiently compressed, and the density of the pressed powder is ensured to be close to that of other places, so that the occurrence of the phenomenon of 'voids' is avoided. In this embodiment, the integrally formed inductor magnet and coil assembly are preformed, and are put into a mold, and then are filled with powder for compression molding to be compression molded, and finally the integrally formed inductor is obtained, wherein in the process, the powder for compression molding is compressed from a loose state to a required density, and the general compression ratio is 2: about 1.

It should be noted that the inclined state may be a straight inclined state or a curved inclined state, and the tail 22 of the low-pin lead may be similarly inclined, so long as the state shown in fig. 3C can be achieved after press molding, so as to connect the electrodes.

An integrally formed inductor, as shown in fig. 3C, includes a magnet and coil assembly, a pressed magnet 30, a first extraction electrode 41, and a second extraction electrode 42. The magnet and coil assembly adopts the magnet and coil assembly of any of the above embodiments, and comprises a magnet 10 and a coil 20, wherein the magnet 10 comprises a core middle post 11 and a core blade 12, the coil 20 is assembled on the core middle post 11, and two wire tails of the coil 20 are positioned at one end of the core middle post 11 far away from the core blade. The two wire tails are a wire tail 21 of the high pin lead and a wire tail 22 of the low pin lead, respectively, wherein the wire tail 21 of the high pin lead is in an inclined state so that the wire tail 21 of the high pin lead moves along the compression direction during compression molding. The tail 21 of the high lead is connected to the first extraction electrode 41, and the tail 22 of the low lead is connected to the second extraction electrode 42. The top surfaces of the first extraction electrode 41 and the second extraction electrode 42 are preferably on the same plane, and further preferably the top ends of the first extraction electrode 41 and the second extraction electrode 42 are bent in the same direction.

The pressed magnet 30 is a magnet formed by pressing and molding loose powder, the density of the pressed magnet 30 is smaller than that of the magnet 10 in the magnet and coil assembly, and the density difference is between 5% and 30%. In the final press-formed product, the pressed magnet 30 integrally wraps the magnet and coil assembly, and only the first extraction electrode 41 and the second extraction electrode 42 are exposed on the surface of the pressed magnet 30 for subsequent installation and use.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

Those skilled in the art may combine and combine the features of the different embodiments or examples described in this specification and of the different embodiments or examples without contradiction.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (9)

1. The magnet and coil assembly for the integrated inductor is characterized by comprising a magnet and a coil, wherein the magnet comprises a magnetic core center post and magnetic core blades, the coil is assembled on the magnetic core center post, and two wire tails of the coil are positioned at one end, far away from the magnetic core blades, of the magnetic core center post;

the two wire tails are respectively the wire tail of the high pin lead and the wire tail of the low pin lead, wherein the wire tail of the high pin lead is in an inclined state so that the wire tail of the high pin lead moves along the compression direction during compression molding.

2. The magnet and coil assembly of claim 1, wherein the tail of the high leg lead is inclined from a predetermined location that is level with or within an allowable height differential from the top surface of the coil.

3. A magnet and coil assembly according to claim 1 or claim 2, wherein the high leg leads are spaced from the outside of the coil by a predetermined distance such that the high leg leads do not contact the coil during and after compression molding.

4. The magnet and coil assembly of claim 1 wherein the magnet is a T-shaped magnet and the core leg is perpendicular to the core blade.

5. The magnet and coil assembly of claim 4, wherein the core leg is any of cylindrical, elliptical or racetrack shape disposed in a central portion of the core blade.

6. The magnet and coil assembly of claim 4, wherein the core blades are rectangular in cross-section.

7. An integrated inductor is characterized by comprising a magnet and coil assembly, a pressed magnet, a first extraction electrode and a second extraction electrode;

the magnet and coil assembly being as claimed in any one of claims 1 to 6, located within the compacted magnet;

the tail of the high-pin lead is connected with the first extraction electrode, and the tail of the low-pin lead is connected with the second extraction electrode.

8. The integrally formed inductor of claim 7, wherein top surfaces of said first and second extraction electrodes are in a same plane.

9. The integrally formed inductor of claim 7, wherein the top ends of said first and second extraction electrodes are bent in the same direction.

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