An assembled inductor

Abstract

The present application proposes an assembled inductor, comprising: a base, provided with a plurality of conductive terminals, the conductive terminals including pin electrodes and connecting electrodes; a plurality of magnets, assembled to form a magnetic core of a closed magnetic circuit, the magnetic core having at least one receiving cavity, at least some of the magnets having a middle column extending to the receiving cavity, the first end of the magnetic core being arranged on the base, and the second end being arranged opposite to the first end; at least one coil winding, arranged on the corresponding middle column, and each coil winding being electrically connected to the connecting electrode of the corresponding conductive terminal; an adsorption sheet, arranged at the second end of the magnetic core and including a first surface and a second surface arranged opposite to each other, the first surface being an integral plane, and the second surface being arranged on the outer surface of the second end of the magnetic core to partially or completely cover the outer surface of the second end. The present application makes the upper surface of the assembled inductor an integral plane, and the upper surface of the assembled inductor finally formed has a high degree of flatness, which can reduce the risk of falling parts during vacuum adsorption patching.

Description

Technical Field

[0001] The present application relates to the technical field of magnetic components, and in particular to an assembled inductor. Background Art

[0002] With the rapid development of science and technology, especially the emergence of multifunctional equipment, the demand for the entire passive device is increasing. As one of the passive components, inductors are also widely used. The requirements for large current, high frequency, and high reliability are constantly upgraded. To meet this, the application of assembled inductors is becoming more and more extensive. The so-called assembled inductors refer to the assembly of multiple magnets, coil windings, and bases. Here, the upper surface of the existing assembled inductor is composed of the surface splicing of two or more magnets, and in order to control the burrs of each magnet, each magnet is formed with an edge process bevel, and a shallow groove will be formed at the splicing of the magnets. When the vacuum suction nozzle of the SMT machine is used for SMT (i.e., mounting the assembled inductor on the circuit board), some air will flow into the groove, resulting in a decrease in the vacuum degree, which will cause the inductor component to fall off (commonly known as "parts falling off"). In addition, a surface height difference is easily generated when two adjacent magnets are assembled, resulting in unevenness or partial defects on the upper surface of the assembled inductor, which will cause the nozzle to inhale some air when the SMT (Surface Mounted Technology) SMT is picking up the material, resulting in a decrease in the vacuum degree, which will cause the inductor component to fall off, seriously affecting the normal production of the assembled inductor and subsequent products. Utility Model Content

[0003] In view of this, the present application provides an assembled inductor, which can improve the problem of poor surface flatness of the assembled inductor and the resulting problem of easy loss of parts during vacuum adsorption of patches.

[0004] The present application provides an assembled inductor, comprising:

[0005] The base is provided with a plurality of conductive terminals, wherein the conductive terminals include pin electrodes and connecting electrodes, and the pin electrodes are used to be electrically connected to an external circuit board;

[0006] A plurality of magnets are assembled to form a magnetic core of a closed magnetic circuit, wherein the magnetic core has at least one receiving cavity, at least some of the magnets are provided with a center column extending to the receiving cavity, a first end of the magnetic core is disposed on the base, and a second end of the magnetic core is disposed opposite to the first end;

[0007] At least one coil winding is disposed on the corresponding center column, and each coil winding is electrically connected to a connection electrode of the corresponding conductive terminal;

[0008] The adsorption sheet is arranged at the second end of the magnetic core and includes a first surface and a second surface arranged back to back, the first surface is an integral plane, and the second surface is arranged on the outer surface of the second end of the magnetic core to partially or completely cover the outer surface of the second end.

[0009] Optionally, the adsorption sheet is set on the second end of the magnetic core by gluing.

[0010] Optionally, the surface roughness of the first surface of the adsorption sheet is Ra and satisfies 0 <Ra≤12.5μm。

[0011] Optionally, the center position accuracy between the adsorption sheet and the surface of the second end of the magnetic core is α, and satisfies 0≤α≤5mm.

[0012] Optionally, the adsorption sheet is a stainless steel sheet, a ceramic sheet or a plastic sheet.

[0013] Optionally, along a direction perpendicular to the base, an orthographic projection of the adsorption sheet falls within an orthographic projection of the second end.

[0014] Optionally, the second end of the magnetic core has a groove formed by assembling the multiple magnets; the adsorption sheet includes a main body and an extension portion, the extension portion is located on a first side and a second side of the main body that are relatively arranged, and is arranged on the first side surface and the second side surface, and at least partially covers the portion of the groove extending to the first side surface and the second side surface.

[0015] Optionally, the extension portion and the main body portion are integrally formed structural components, or the extension portion and the main body portion are independent structural components.

[0016] Optionally, on a side of the base facing away from the magnetic core, the pin electrode is higher than the connecting electrode.

[0017] Optionally, the pin electrode includes a first part, a second part and a connecting part, the first part is exposed from the base, the second part is sunken into the base, the connecting part connects the first part and the second part with a height difference so that the pin electrode forms a accommodating area, and the connecting electrode is arranged in the accommodating area and electrically connected to the pin electrode.

[0018] As described above, the magnetic core of the present application is formed by assembling multiple magnets, and an adsorption sheet is arranged on the magnetic core, and the first surface of the adsorption sheet is an integrated plane, that is, the outer surface of the second end of the magnetic core is covered by the adsorption sheet, so as to cover, for example, the groove formed at the second end of the magnetic core when multiple magnets are assembled, and the height difference formed on the outer surface of the second end of the magnetic core due to processing deviation or installation deviation of adjacent magnets, so that the upper surface of the assembled inductor of the present application is an integrated plane, and the upper surface of the assembled inductor finally formed has a higher flatness, which can reduce the risk of falling parts during vacuum adsorption patching.

[0019] In addition, on the side of the base facing away from the magnetic core, the pin electrode is higher than the connecting electrode. After the connecting electrode is electrically connected to each coil winding, it will not affect the coplanarity of the product patch and each pin electrode, which can greatly meet the requirements for product coplanarity during patching and is conducive to high-degree of automation production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 and Figure 2 It is a structural schematic diagram of an assembled inductor provided by the present application from two perspectives;

[0021] Figure 3 yes Figure 2 A cross-sectional view of the assembled inductor along the AA direction shown;

[0022] Figure 4 is a schematic structural diagram of a first magnet provided in the present application;

[0023] Figure 5 It is a schematic diagram of the structural coordination of two coil windings of the assembled inductor of the present application, one of the magnets and the base;

[0024] Figure 6 It is a schematic diagram of the connection between two coil windings and conductive terminals of the present application;

[0025] Figure 7 It is a structural schematic diagram of a pin electrode provided in this application.

[0026] First direction x Second direction y Third direction z

[0027] Assembled inductor 1

[0028] Base 10

[0029] Conductive terminal 101 Pin electrode 102 Connecting electrode 103

[0030] First part 104 Second part 105 Connecting part 106 Accommodating area 107

[0031] Magnet 11

[0032] First terminal D1 Second terminal D2

[0033] The receiving chamber 1a has a central column 110, a first magnet 111, a second magnet 112, and a third magnet 113.

[0034] First side 114

[0035] Coil winding 12

[0036] Adsorption sheet 13

[0037] First surface 131 DETAILED DESCRIPTION

[0038] In order to solve the above-mentioned problems existing in the prior art, the present application provides an assembled inductor, wherein a magnetic core is formed by assembling a plurality of magnets, and an adsorption sheet is arranged on the magnetic core, and the first surface of the adsorption sheet is an integrated plane, that is, the adsorption sheet is arranged on the outer surface of the second end of the magnetic core to partially or completely cover the outer surface of the second end, so as to cover, for example, the groove formed at the second end of the magnetic core when the plurality of magnets are assembled, and the height difference formed on the outer surface of the second end of the magnetic core due to processing deviation or installation deviation between adjacent magnets, so that the upper surface of the assembled inductor is an integrated plane, and the upper surface of the assembled inductor finally formed has a higher degree of flatness, thereby reducing the risk of parts falling off during vacuum adsorption patching.

[0039] In the assembled inductor, the specific expressions of parameters such as shape, quantity, size, etc. of each structural element including each magnet, magnetic core, coil winding, base and conductive terminal can be determined according to the actual application scenario and the required adaptability of the configuration, and this application does not limit them.

[0040] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly described below in conjunction with specific embodiments and corresponding drawings. Obviously, the embodiments described below are only part of the embodiments of the present application, not all of the embodiments. In the absence of conflict, the following embodiments and their technical features can be combined with each other and also belong to the technical solutions of the present application.

[0041] In the description of the embodiments of the present application, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the technical solutions of the corresponding embodiments, rather than indicating or implying that a device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present application.

[0042] In order to facilitate the description and understanding of the solution of this application, Figures 1 to 7The placement orientation shown, hereinafter the width direction of the assembled inductor is referred to as the first direction x, the length direction (i.e. the height direction when in a standing position) is referred to as the second direction y, and the thickness direction is referred to as the third direction z. The first direction x, the second direction y and the third direction z are perpendicular to each other and can be regarded as the three coordinate axes of a three-dimensional rectangular coordinate system. It should be understood that the so-called perpendicularity in the whole application does not require that the angle between the two must be 90°, but allows a deviation of, for example, ±10°, that is, the so-called perpendicularity can be understood as the angle between any two directions being 80° to 100°. Similarly, the so-called parallelism in the whole application does not require that the angle between the two must be 0° or 180°, but allows a deviation of, for example, ±10°, that is, the so-called parallelism can be understood as the angle between any two directions being 0° to 10° or 170° to 190°.

[0043] Please also read Figures 1 to 7 , shows a schematic diagram of the assembly inductor 1 and its related structural elements in an optional embodiment of the present application. The assembly inductor 1 includes a base 10, three magnets 11, two coil windings 12 and an adsorption sheet 13.

[0044] The base 10 is provided with a plurality of conductive terminals 101 , and the conductive terminals 101 include pin electrodes 102 and connecting electrodes 103 . The pin electrodes 102 are used to be electrically connected to an external circuit board so that the assembled inductor 1 is mounted, such as the so-called SMT mounting.

[0045] The three magnets 11 are respectively called the first magnet 111, the second magnet 112 and the third magnet 113. The second magnet 112 can be a traditional soft magnetic I-type magnet, that is, a sheet or plate magnet. The first magnet 111 and the third magnet 113 can be traditional soft magnetic EP-type magnets, and the two are symmetrically arranged with the second magnet 112. The first magnet 111, the second magnet 112 and the third magnet 113 are sequentially assembled along the first direction x to form a magnetic core of a closed magnetic circuit. Here, grooves are formed at the assembly of the three magnets, such as Figure 1 and Figure 2As shown, the groove is located on the outer surface (i.e., the upper surface) of the second end (i.e., the so-called "lower end") D2 of the magnetic core and the two side surfaces disposed opposite to each other, which can be referred to as the first side surface 114 and the second side surface disposed opposite to each other along the third direction z, and the first end (i.e., the so-called "lower end") D1 of the magnetic core disposed opposite to the second end D2 is disposed on the base 10. The magnetic core has two receiving cavities 1a, one of which is defined by the first magnet 111 and the second magnet 112 when they are assembled, and the other is defined by the third magnet 113 and the second magnet 112 when they are assembled. The first magnet 111 and the third magnet 113 are respectively provided with a middle column 110 extending to the corresponding receiving cavity 1a, for example, one end of the middle column 110 of the first magnet 111 is connected to the body of the first magnet 111, and the other end extends toward the second magnet 112; one end of the middle column 110 of the third magnet 113 is connected to the body of the third magnet 113, and the other end extends toward the second magnet 112.

[0046] The two coil windings 12 are respectively located in the corresponding receiving cavities 1a, wherein one coil winding 12 is disposed on the middle column 110 of the first magnet 111, and the other coil winding 12 is disposed on the middle column 110 of the third magnet 113, and each coil winding 12 is electrically connected to the connection electrode 103 of the corresponding conductive terminal, for example, one end of a single coil winding 12 is electrically connected to a corresponding connection electrode 103, and the other end is electrically connected to a corresponding other connection electrode 103. The electrical connection method includes but is not limited to at least one of tinning, soldering, laser welding, and conductive adhesive bonding.

[0047] The adsorption sheet 13 is disposed at the second end D2 of the magnetic core and includes a first surface 131 and a second surface disposed opposite to each other. Figure 1 In the scenario shown, the first surface 131 is what is commonly referred to as an upper surface, and the upper surface is an integrated plane. The so-called integrated plane can be understood as: a complete plane without cracks, or the cracks in the plane are small and air will not enter during vacuum adsorption, or the angle between the smaller crack and the groove is greater than a preset threshold and air will not enter during vacuum adsorption.

[0048] The second surface of the adsorption sheet 13 is the so-called lower surface, which is disposed on the outer surface of the second end D2 of the magnetic core to partially or completely cover the outer surface of the second end D2, thereby partially or completely covering the grooves on the upper surface. By "partial coverage" it means that: in the opposite direction of the second direction y, the positive projection of the second surface of the adsorption sheet 13 falls within the positive projection of the outer surface of the second end D2, and the positive projection area of the second surface of the adsorption sheet 13 is smaller than the positive projection area of the outer surface of the second end D2. In the example of the partial coverage, the positive projection area of the adsorption sheet 13 should be larger than the positive projection area of the nozzle when vacuum adsorbing the patch, so that the positive projection of the nozzle falls within the positive projection of the adsorption sheet 13, thereby avoiding component dropping. By "complete coverage" it means that: in the opposite direction of the second direction y, the positive projection of the outer surface of the second end D2 falls within the positive projection of the second surface of the adsorption sheet 13.

[0049] In one example, the adsorption sheet 13 is disposed on the second end D2 of the magnetic core by means of glue pasting, and the second surface of the adsorption sheet 13 is bonded to the upper surfaces corresponding to all the magnets 11.

[0050] As described above, in the present application, the grooves formed by assembling a plurality of magnets 11 are covered by the adsorption sheet 13, so that the upper surface of the assembled inductor 1 is an integral plane, and the flatness of the upper surface of the finally formed assembled inductor 1 is relatively high, which can reduce the risk of component dropping during vacuum adsorption and patching.

[0051] In one example, the surface roughness of the first surface 131 of the adsorption sheet 13 is Ra, and 0 < Ra ≤ 12.5 μm is satisfied. With this lower surface roughness, the flatness of the upper surface of the assembled inductor 1 is relatively high, which can further reduce the risk of component dropping during vacuum adsorption and patching.

[0052] In one example, the central position degree between the adsorption sheet 13 and the surface of the second end D2 of the magnetic core is α, and 0 ≤ α ≤ 5 mm is satisfied, ensuring that the adsorption sheet 13 better covers the grooves on the upper surface.

[0053] The adsorption sheet 13 can be a stainless steel sheet, a ceramic sheet or a plastic sheet, with low material cost and easy to obtain. The adsorption sheet 13 can be used in an environment above 80 °C for a long time, and the maximum temperature resistance can reach above 250 °C.

[0054] In one example, along the direction perpendicular to the base 10, that is, in the opposite direction of the second direction y, the positive projection of the adsorption sheet 13 falls within the positive projection of the second end D2 of the magnetic core, that is, the adsorption sheet 13 only covers a part of the upper surface of the magnetic core or just completely covers the upper surface of the magnetic core.

[0055] In another example, considering that the groove also extends to the first side 114 and the second side of the magnetic core, the present application may also involve the adsorption sheet 13 partially covering the portion where the groove extends to the two sides. For example, the adsorption sheet 13 may include a main body and an extension portion, wherein the main body may be regarded as Figure 1 and Figure 2 In the structure of the adsorption sheet 13 shown, the extension portion is located on the first side and the second side of the main body that are opposite to each other, and is arranged on the first side and the second side, and at least partially covers the portion of the groove extending to the first side 114 and the second side. The extension portion and the main body can be an integrally formed structural member, or the extension portion and the main body can be independent structural members.

[0056] Continue reading Figures 1 to 7 As shown, on the side of the base 10 facing away from the magnetic core, the pin electrode 102 is higher than the connecting electrode 103, for example, the pin electrode 102 protrudes from the lower surface of the base 10, while the connecting electrode 103 does not protrude from (for example, is sunken into) the lower surface of the base 10. Here, after the connecting electrode 103 is electrically connected to each coil winding 12, the coplanarity of the product patch and each pin electrode 102 will not be affected, which can greatly meet the requirements for product coplanarity during patching, and is conducive to high-automatic production.

[0057] See also Figure 6 and Figure 7 The example shown, Figure 7 by Figure 6 A pin electrode 102 shown by the dotted line is used as an example for demonstration. The pin electrode 102 includes a first portion 104, a second portion 105 and a connecting portion 106. The first portion 104 is a plate-like structure (or a "block-like structure") as a whole and is exposed on the base 10. The second portion 105 is a plate-like structure as a whole and is sunken in the base 10. The first portion 104 and the second portion 105 have a height difference. The connecting portion 106 connects the first portion 104 and the second portion 105 so that the pin electrode 10 2 forms a receiving area 107, the connecting electrode 103 is arranged in the receiving area 107 in a plate-like structure, and contacts the second portion 105, the first portion 104 and the connecting portion 106, so as to realize the electrical connection between the connecting electrode 103 and the pin electrode 102. Here, the present application can better hide the connecting electrode 103 in the space occupied by the pin electrode 102, so as to realize the conductive terminal 101 with a more compact structure and higher space utilization, which is conducive to the miniaturization design of the conductive terminal 101 and the assembled inductor 1.

[0058] Different from the above Figures 1 to 7As shown in the structural design, in other examples of the present application, the groove is not formed on the outer surface of the second end D2 of the magnetic core of the assembled inductor 1, but there are defects that affect the vacuum adsorption patch due to other reasons. For example, adjacent magnets only form a height difference on the outer surface of the second end D2 of the magnetic core due to processing deviation or installation deviation. At this time, the adsorption sheet 13 can also cover these height differences, defects, etc., so that the upper surface of the assembled inductor 1 is an integrated plane. The upper surface of the assembled inductor 1 finally formed has a higher flatness, thereby reducing the risk of falling parts during vacuum adsorption of the patch.

[0059] It should be understood that the assembled inductor 1 provided in the present application is a complete device and may also have a corresponding structure of a known device, which will not be described in detail here.

[0060] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. For ordinary technicians in this field, all equivalent structural changes made using the contents of this specification and drawings are also included in the patent protection scope of the present application.

[0061] Although the terms "first, second", etc. are used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. In addition, the singular forms "one", "an", and "the" are intended to include plural forms as well. The terms "or" and "and / or" are interpreted as inclusive, or mean any one or any combination. Only when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way, an exception to this definition will occur.

Claims

1. An assembled inductor, characterized in that: include: The base is provided with a plurality of conductive terminals, wherein the conductive terminals include pin electrodes and connecting electrodes, and the pin electrodes are used to be electrically connected to an external circuit board; A plurality of magnets are assembled to form a magnetic core of a closed magnetic circuit, wherein the magnetic core has at least one receiving cavity, at least some of the magnets are provided with a center column extending to the receiving cavity, a first end of the magnetic core is disposed on the base, and a second end of the magnetic core is disposed opposite to the first end; At least one coil winding is disposed on the corresponding center column, and each coil winding is electrically connected to a connection electrode of the corresponding conductive terminal; The adsorption sheet is arranged at the second end of the magnetic core and includes a first surface and a second surface arranged back to back, the first surface is an integral plane, and the second surface is arranged on the outer surface of the second end of the magnetic core to partially or completely cover the outer surface of the second end.

2. The assembled inductor according to claim 1, characterized in that: The adsorption sheet is arranged on the second end of the magnetic core by gluing.

3. The assembled inductor according to claim 1, characterized in that: The surface roughness of the first surface of the adsorption sheet is Ra and satisfies 0 <Ra≤12.5μm。 4. The assembled inductor according to claim 1, characterized in that: The center position of the adsorption sheet and the surface of the second end of the magnetic core is α, and satisfies 0≤α≤5mm.

5. The assembled inductor according to claim 1, characterized in that: The adsorption sheet is a stainless steel sheet, a ceramic sheet or a plastic sheet.

6. The assembled inductor according to any one of claims 1 to 5, characterized in that: Along a direction perpendicular to the base, the orthographic projection of the adsorption sheet falls within the orthographic projection of the second end.

7. The assembled inductor according to any one of claims 1 to 5, characterized in that: The second end of the magnetic core has a groove formed by assembling the plurality of magnets; The adsorption sheet includes a main body and an extension portion, wherein the extension portion is located on a first side and a second side of the main body that are opposite to each other, and is arranged on a first side surface and a second side surface of the magnetic core, and at least partially covers a portion of the groove extending to the first side surface and the second side surface.

8. The assembled inductor according to claim 7, characterized in that: The extension portion and the main body portion are integrally formed structural members, or the extension portion and the main body portion are independent structural members.

9. The assembled inductor according to claim 1, characterized in that: On a side of the base facing away from the magnetic core, the pin electrode is higher than the connecting electrode.

10. The assembled inductor according to claim 9, characterized in that: The pin electrode includes a first part, a second part and a connecting portion, wherein the first part is exposed from the base, and the second part is sunken into the base. The connecting portion connects the first part and the second part with a height difference so that the pin electrode forms a receiving area. The connecting electrode is arranged in the receiving area and is electrically connected to the pin electrode.

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