CN217214407U

CN217214407U - Inductor for improving saturated current bearing capacity

Info

Publication number: CN217214407U
Application number: CN202220650166.8U
Authority: CN
Inventors: 饶金火; 林伙利; 王俊文
Original assignee: SANJIRUI TECHNOLOGY (SUZHOU) CO LTD
Current assignee: SANJIRUI TECHNOLOGY (SUZHOU) CO LTD
Priority date: 2022-03-24
Filing date: 2022-03-24
Publication date: 2022-08-16
Anticipated expiration: 2032-03-24

Abstract

The utility model discloses a promote inductor of saturation current bearing capacity, inductor are connected and the hot pressing package shaping by magnetic core body, pancake coil, pin piece dress. The magnetic core body is in a T-shaped angle formed by cold pressing and comprises a base with a disc-shaped bottom and a convex column with the surface coaxially extending upwards; the flat coil takes the base as a bearing body and is formed on the convex column in a winding way; the pin pieces are attached to two sides of the base in pairs in the radial direction and are connected with the flat coil into a whole; the lead sheet is bent to cover the packaging shell to form the contact through one-time hot-pressing packaging molding. The utility model greatly improves the saturated current bearing capacity of the inductor through the structural optimization of the inductor; meanwhile, the problems of open circuit during welding and increased contact resistance are effectively solved; the performance of the inductor product is improved, the production efficiency is improved, and the energy consumption and the production cost are reduced.

Description

Inductor for improving saturated current bearing capacity

Technical Field

The utility model relates to an inductance device especially relates to an inductor of high saturation, belongs to basic electronic components technical field.

Background

The inductor is the most common component in electronic equipment, and is widely used in various circuits to achieve the functions of filtering, energy storage, matching and resonance. The inductance component can be rapidly developed under the condition that electronic products are gradually miniaturized and portable and the components are assembled at high density; in consideration of electromagnetic compatibility, the anti-electromagnetic interference capability of electronic products becomes a basic design requirement, thereby increasing the inductance requirement and application.

At present, most of common inductors in the market are manufactured by adopting a cold pressing process, and coils used in the inductors are almost common coils with circular sections. The inductor manufactured by the processing technology matched with the coil has poor reliability and high Electro Magnetic Interference (EMI), and the inductor has the problems of low bearable maximum current, high alternating current loss, high product energy consumption and the like in practical use.

In addition, a part of inductor structure design and manufacturing methods are generally to directly place the coil in the magnetic material in a mold, fill and cover the magnetic material, and then perform one-step die casting. The coil is easily displaced by an external force during filling and molding due to poor fixation of the coil. In addition, in the high voltage process, the coil is easily deformed or damaged under the direct bearing of the high voltage, so that the yield and performance of the inductor assembly are greatly reduced, especially the bearing capacity for the high saturation current. In subsequent equipment-level or system-level application, the obtained inductor has poor temperature controllability and working efficiency, and the function realization and performance exertion of the applied finished equipment are directly influenced.

Therefore, how to find an inductor with high saturation characteristics and practical value for mass production becomes a problem to be solved by those skilled in the art.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide an inductor with improved saturation current carrying capacity by optimizing the structure.

The utility model provides a technical solution who realizes above-mentioned purpose is, an inductor that promotes saturation current bearing capacity, by magnetic core body, pancake coil, pin piece dress connects links to each other and hot pressing packaging shaping, its characterized in that: the magnetic core body is in a T-shaped angle formed by cold pressing and comprises a base with a disc-shaped bottom and a convex column with the surface coaxially extending upwards; the flat coil takes the base as a bearing body, is formed on the convex column in a winding way, and has equivalent turns of more than two turns; the pin pieces are attached to two sides of the base in pairs in the radial direction, and the pin pieces on either side are connected with one outer end of the flat coil into a whole; and under the hot-press packaging state, the pin sheets are bent to wrap the packaging shell and are mutually separated.

In the inductor for improving the saturation current carrying capacity, the magnetic core body is a single block body formed by cold pressing magnetic powder, the convex column is cylindrical, the height of the convex column exceeds the height of the flat coil in a winding and forming mode, and the surface of the convex column and the flat coil are arranged at intervals in the radial direction.

The inductor for improving the saturation current carrying capacity is characterized in that the flat coil is formed by independently winding and processing a flat wire rod and is sleeved on the convex column, wherein the outer end part of the flat wire rod is in smooth transition from a flat state with the thickness to a square column state with the same width and the width to a flat state with the same width, and is flatly attached to the pin sheet.

The inductor for improving saturation current carrying capacity is further provided with two outer end parts of the flat wire which extend in the same direction or in opposite directions.

In the inductor for improving the saturation current carrying capacity, furthermore, the edge of the lead sheet connected with the base is concavely formed into an arc shape which is mutually attached, and the side of the edge corresponding to the outer end part of the flat coil is epitaxially formed into a backing plate connected with the edge.

In the inductor for improving the saturation current carrying capacity, the package housing is a square block formed by hot-pressing magnetic powder, and completely wraps the magnetic core body, the flat coil and the connection part of the magnetic core body and the flat coil and the pin sheet.

In the inductor for improving the saturation current carrying capacity, further, the main body of the lead piece is formed by extending wing-shaped bodies on two sides of the packaging shell in a self-sealing mode and is bent in the same direction to form two connection points on one side end face of the packaging shell.

Compared with the prior art, use the utility model discloses inductor's advantage is embodied in:

the inductor adopts a flat coil formed by externally winding a flat wire rod method through a magnetic core body formed by cold pressing, and the two parts of independent processes are high in assembly convenience; the inductor is integrated by hot-pressing and packaging, so that the saturation current carrying capacity of the inductor is greatly improved.

Meanwhile, the structure optimization of the outer end part of the flat coil and the pin sheet base plate ensures that the structural strength of the inductor prefabricated body is reliable, the problems of open circuit during welding and increase of contact resistance are effectively solved except that the deformation is reduced by coping with the external force of hot press molding, and the temperature rise speed caused by saturated current is restrained and accelerated.

Drawings

Fig. 1 is a schematic perspective view of a magnetic core in an inductor according to the present invention.

Fig. 2 is a schematic perspective view of a pancake coil in an inductor according to the present invention.

Fig. 3 is a schematic diagram of an assembly structure of the pancake coil, the magnetic core and the pin sheet in the inductor of the present invention.

Fig. 4 is a perspective view of the inductor in a packaged state.

Fig. 5 is a schematic diagram of the three-dimensional structure of the inductor after the primary packaging is completed.

Fig. 6 is a schematic perspective view of a finished inductor of the present invention.

Detailed Description

The following detailed description is made of specific embodiments of the present invention with reference to the accompanying drawings, so as to make the technical solution of the present invention easier to understand and grasp, and thus make a clearer definition of the protection scope of the present invention.

The utility model discloses the designer is not enough to current common inductor, and the innovation has provided an inductor that promotes saturation current bearing capacity, is favorable to advancing application and performance that the inductor followed all kinds of servers, high in the clouds server etc. from micro-device, and concrete scheme is as follows.

As shown in fig. 1 to 5, the inductor is formed by attaching and thermocompression bonding a core body 1, a flat coil 2, and a lead piece 3. In view of structural optimization, the magnetic core body 1 is in a T-shaped angle formed by cold pressing, and comprises a base 11 with a disc-shaped bottom and a convex column 12 with the surface coaxially extending upwards; the flat coil 2 is formed on the convex column 12 by winding and connecting with the base 11 as a supporting body; the pin pieces 3 are attached to two radial sides of the base 11 in pairs, and any one of the pin pieces is connected with one outer end 21 of the flat coil into a whole; in the hot-press packaging state, the lead pieces 3 are bent to wrap the package housing 4 and are separated from each other.

It should be noted that, because the present invention adopts the flat wire material to wind into the coil, the actual forming thickness of the flat coil is smaller, and the winding thickness of the single layer three turns as shown in the figure is also only almost different from the winding thickness of the common circular section coil (and the equivalent number of turns is increased significantly). The magnetic core 1 is a single block cold-pressed from magnetic powder, and the convex column 12 is a cylinder in the illustrated embodiment. For the shape design of the magnetic core, the diameter of the convex column 12 can be slightly smaller than that of the base 11 depending on the thickness specification of the flat coil, so that the magnetic flux range is enlarged. Moreover, the convex column surface and the flat coil are arranged at intervals in the radial direction, so that the two parts are easily sleeved when assembled, and are directly positioned and cured after hot-press packaging. In addition, the height of the convex column exceeds the height of the flat coil in the winding forming process, so that most of pressure from the surface is applied to the convex column in the hot press forming process, and the bad phenomena that the flat coil is pressed to displace and the flat coil is detached from the pin sheet are avoided.

From a further refinement feature, the upper flat coil 2 is formed by independently winding and processing a flat wire and is sleeved on the convex column 12, wherein the outer end portion 21 of the flat wire is in a smooth transition from a flat state with the thickness a to a square column state with the same width and thickness and then to a flat state with the width B. Therefore, the winding axial direction of the flat coil is perpendicular to the surface of the pin sheet, and the defect of difficult welding and fixing is overcome. And through the transitional change of the shape, the lead frame can be flatly attached to the pin sheet, so that the lead frame and the pin sheet are convenient to weld and fix (preferably in a laser welding mode). In addition, a section of the flat wire led out from the outer end portion may be folded by 90 °, which increases the risk of manual work and makes it difficult to reliably ensure the uniformity of the folding angle.

As can be seen, the two outer ends 21 of the flat wire extend in the same direction, i.e. towards the same side of the common center line of the two pin pieces. The edge 31 of the lead sheet 3 connected with the base 11 is concavely formed into a mutually attached arc shape, and the side of the edge corresponding to the outer end part of the flat coil is epitaxially formed into a backing plate 32 connected with the edge. The laser welding device is separated from the miniature flat coil by a certain distance so as to facilitate the completion of welding operation with high precision and high compactness and prevent the irradiation damage of the laser to the flat coil.

Of course, in addition to the preferred embodiment shown, the two outer ends of the flat wire wound and looped may be extended in opposite directions. Correspondingly, the pad of the lead sheet is also adjusted according to the situation.

Furthermore, the package housing 4 is a square block body formed by hot-pressing magnetic powder in a customized mold, and completely covers the magnetic core 1, the flat coil 2 and the connection part of the flat coil and the lead plate 3 in a cured state. As a circuit application for inductors, it requires the use of a pin sheet shaped to access the circuit soldered contacts. Therefore, the main body of the lead tab 3 is formed into a shape of wing-like extensions from both sides of the package housing after the hot press packaging and the mold release, and further needs to be bent in the same direction to form two contacts on one side end surface of the package housing, as shown in fig. 6. Of course, components of the conventional PCBA board are all subjected to flat plate bonding during assembly, so the contact implementation of the inductor shown in fig. 5 is reasonable and common.

It should be noted that the magnetic powder for molding and preparing the magnetic core body is a soft powder composition of one or more than two of carbonyl iron powder, alloy-doped fesicrocrystal, fesiall, FeSi, and FeNi, and the cold press molding pressure can be set to 5T to 8T/cm. The hot-pressing powder for forming the package case is one or a combination of two or more soft powders selected from carbonyl iron powder, FeSiCr amorphous, FeSiCr nanocrystalline, FeSiAl, FeSi and FeNi.

To sum up, the present invention inductor introduction and embodiments detailed can be seen, compared with the prior art, this scheme has substantial features and progressiveness, many aspects are described as follows.

In addition to the above embodiments, the present invention may have other embodiments, and all technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of the present invention.

Claims

1. An inductor for improving the saturated current carrying capacity is formed by connecting a magnetic core body, a flat coil and a pin piece in a hot-pressing packaging mode, and is characterized in that: the magnetic core body is in a T-shaped angle formed by cold pressing and comprises a base with a disc-shaped bottom and a convex column with the surface coaxially extending upwards; the flat coil takes the base as a bearing body and is formed on the convex column in a winding way; the pin pieces are attached to two sides of the base in pairs in the radial direction, and the pin pieces on either side are connected with one outer end of the flat coil into a whole; and under the hot-press packaging state, the pin sheets are bent to wrap the packaging shell and are mutually separated.

2. The inductor for improving the saturated current carrying capacity according to claim 1, wherein: the magnetic core body is a single block body formed by cold pressing of magnetic powder, the convex column is cylindrical, the height of the convex column exceeds the height of the flat coil in a winding and forming mode, and the surface of the convex column and the flat coil are arranged at intervals in the radial direction.

3. The inductor for improving the saturated current carrying capacity according to claim 1, wherein: the flat coil is formed by independently winding and processing a flat wire rod and is sleeved on the convex column, wherein the outer end part of the flat wire rod is in smooth transition from a flat state with the thickness to a square column state with the same width and thickness and then to a flat state with the width, and is flatly attached to the pin sheet.

4. The inductor of claim 3, wherein: the two outer ends of the flat wire are arranged in a co-extending mode or in a reverse extending mode.

5. The inductor of claim 3, wherein: the edge of the pin piece connected with the base is concavely formed into circular arcs which are mutually attached, and the side of the edge corresponding to the outer end part of the flat coil is epitaxially formed into a backing plate connected with the edge.

6. The inductor for improving the saturated current carrying capacity according to claim 1, wherein: the packaging shell is a square block body formed by hot-pressing magnetic powder and completely wraps the magnetic core body, the flat coil and the connection part of the flat coil and the pin sheet.

7. The inductor for improving the saturated current carrying capacity according to claim 1, wherein: the main body of the pin sheet is extended from wing-shaped bodies on two sides of the packaging shell and is bent in the same direction to form two connection points on one side end face of the packaging shell.