Assembled inductor

Abstract

The invention discloses an assembled inductor which comprises a magnet and a terminal assembly, the terminal assembly comprises an insulating connector and a plurality of conductive terminals connected to the insulating connector, and the conductive terminals are arranged on the insulating connector at intervals; the magnet is arranged to form mounting parts matched with the terminal combination body on a predetermined side surface of the magnet and at the top surface edge and the bottom surface edge connected with the predetermined side surface, and the mounting parts are used for assembling the terminal combination body; and the top and the bottom of the mounting part are respectively sunken in the top surface and the bottom surface of the magnet.

Description

Technical Field

[0001] The invention relates to an assembled inductor, belonging to the technical field of electronic components. Background Art

[0002] The existing high current inductor used for chip power supply has a double-sided patch application, and a terminal assembly structure for transmitting signals is assembled around it. The most common ones are, for example, Figure 1 The structure shown is composed of a magnet 100 and a pin terminal 200. The terminal is composed of an injection molded body and assembled on one side of the magnet. The pin terminal structure occupies a large space and the power density of the magnet is reduced, which affects the inductance characteristics.

[0003] To this end, some solutions in the prior art have proposed to form pin terminals on the magnet by electroplating / printing, which can reduce the space occupied by the terminals. However, these solutions have a large limit on the thickness of the terminals, usually limiting the thickness of the terminals to 20μm to 50μm; on the other hand, due to the large number of terminals, which are usually arranged in rows on the magnet, it is difficult to control the position and size of the terminals when making these terminals. Summary of the invention

[0004] In view of this, the present invention proposes an assembled inductor, which reduces the space occupied by the signal transmission terminal and ensures the relative position accuracy of the terminal and the magnet by jointly improving the design of the signal transmission terminal and the magnet.

[0005] An assembled inductor, comprising: a magnet and a terminal assembly, wherein the terminal assembly comprises an insulating connector and a plurality of conductive terminals connected to the insulating connector, and the plurality of conductive terminals are arranged at intervals on the insulating connector; the magnet is arranged to form a mounting portion adapted to the terminal assembly at a predetermined side surface and at the top and bottom edges connected to the predetermined side surface, for assembling the terminal assembly; wherein the top and bottom of the mounting portion are respectively recessed in the top and bottom surfaces of the magnet.

[0006] A first edge region of the top of the mounting portion close to the predetermined side surface and a second edge region of the bottom close to the predetermined side surface respectively form a first predetermined angle greater than or equal to 90 degrees with the predetermined side surface;

[0007] Furthermore, the plurality of conductive terminals include at least one conductive terminal of the same shape; each of the conductive terminals includes: a middle portion connected to the insulating connector, and an upper end and a lower end respectively connected to opposite ends of the middle portion; the middle portion forms a second predetermined angle greater than or equal to 90 degrees with the upper end and the lower end respectively.

[0008] Further, in a first direction, the length of the first edge area is smaller than the length of the upper end, and the length of the second edge area is smaller than the length of the lower end; wherein the first direction is a direction from the inner end to the outer end of the upper end or the lower end, or from the outer end to the inner end, wherein the inner end is an end connected to the middle part, and the outer end is an end opposite to the inner end.

[0009] Further, the length of the first edge area in the first direction is equal to the length of the second edge area in the first direction; the length of the upper end of the conductive terminal in the first direction is equal to the length of the lower end in the first direction, and the length value is denoted by L; the first predetermined angle is equal to the second predetermined angle.

[0010] Furthermore, the inner height H2 of the middle portion and the height H1 of the mounting portion satisfy: H2=H1+gap, the gap value is no more than 0.2 mm, and H1 is the distance between the top horizontal portion and the bottom horizontal portion of the mounting portion.

[0011] Furthermore, the second predetermined angle θ of the conductive terminal satisfies: L*tan(θ-90°)≤△, wherein △ is a preset product coplanarity requirement.

[0012] Furthermore, the terminal assembly and the magnet are bonded and fixed by glue.

[0013] Furthermore, the transverse cross-sectional areas of the upper end and the lower end of the conductive terminal are both more than twice the vertical cross-sectional area of ​​the middle portion.

[0014] Furthermore, the arrangement interval of the plurality of conductive terminals on the insulating connector is not less than 0.3 mm; and the thickness of the conductive terminals is not less than 0.05 mm.

[0015] Furthermore, the magnet includes magnetic powder and copper terminals. The copper terminals are pressed together with the magnetic powder and protrude from the surface of the magnet to a predetermined height when the magnetic powder is pressed into shape.

[0016] The beneficial effects of the technical solution of the present invention are reflected in: the structural design and assembly of the assembled inductor of the present invention, the magnet and the terminal assembly, on the one hand, can form a pin terminal for transmitting signals within the original magnet design size space, thereby improving space utilization and improving the inductor power density; on the other hand, it is easier to ensure the position of the pin terminal structure and the magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of an existing assembled inductor.

[0018] Figure 2It is a schematic diagram of an assembled inductor according to an embodiment of the present invention.

[0019] Figure 3 It is a schematic diagram of a terminal assembly according to an embodiment of the present invention.

[0020] Figure 4 It is a schematic diagram of the mounting portion on the magnet according to an embodiment of the present invention.

[0021] Figure 5 4 is a side view of a terminal assembly according to an embodiment of the present invention.

[0022] Figure 6 Schematic diagram of another assembled inductor according to an embodiment of the present invention.

[0023] Figure 7 It is a schematic diagram of another terminal assembly according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods and examples. The purpose of providing the examples is only for illustration, and not for any limitation. In addition, the spatial orientation words such as "upper", "lower", "top", and "bottom" used in the description of the technical solution of the present invention are convenient for describing the relative position relationship between the components of the product, and do not mean that the product has only the swing direction shown in the figure. In actual use, as the product swing direction is different (for example, rotated 90 degrees or other orientations), the spatial related descriptions used to describe its swing direction should also be interpreted in a similar manner. In addition, the terms "first", "second", etc. are only used to distinguish components. It should be understood that these components should not be limited by such terms. They themselves do not mean that these elements have the aforementioned ordinal numbers, nor do they represent the arrangement order of a certain component and another component, or the order in the manufacturing method.

[0025] Please refer to Figure 2 The assembled inductor provided by one embodiment of the present invention comprises a magnet 10 and a terminal assembly 20. The terminal assembly 20 is assembled with the magnet through a specific mounting portion on the magnet 10 to form the assembled inductor. Figure 3 The terminal assembly 20 includes an insulating connector 21 and a plurality of conductive terminals connected to the insulating connector 21. The plurality of conductive terminals are arranged at intervals on the insulating connector 21 to prevent the terminals from being connected to each other. The magnet 10 is arranged at a predetermined side surface and at the top and bottom edges connected to the predetermined side surface to form a mounting portion adapted to the terminal assembly 20, for assembling the terminal assembly 20, such as Figure 4 As shown, the top and bottom of the mounting portion are respectively recessed into the top surface and bottom surface of the magnet 10 .

[0026] The terminal assembly 20 of the embodiment of the present invention may include only one type of conductive terminals, or two or more types, but preferably no more than three types, which are respectively applied to different currents or signals. Figure 3 In the illustrated embodiment, the terminal assembly includes two different conductive terminals 22 and 23. In this example, the number of each conductive terminal is not limited and is set according to specific device requirements. Preferably, the dimensions of each conductive terminal are consistent.

[0027] Continue to refer Figure 3 The conductive terminal 22 includes a middle portion 221 connected to the insulating connector 21, and an upper end portion 222 and a lower end portion 223 respectively connected to opposite ends of the middle portion 221. Other conductive terminals, such as the conductive terminal 23, also similarly include a middle portion and upper and lower ends. The side surfaces of these conductive terminals are generally C-shaped, which can be referred to Figure 5 .

[0028] In some embodiments, the top and bottom of the mounting portion are at 90 degrees to the predetermined side, and correspondingly, the upper end and lower end of the conductive terminal are also at 90 degrees to the middle portion. In some preferred embodiments, in order to facilitate the assembly and connection between the terminal assembly 20 and the magnet 10, the mounting portion on the magnet 10 and the conductive terminal of the terminal assembly 20 are optimized. For details, please refer to Figure 4 and Figure 5 , the edge area of ​​the top of the mounting portion close to the predetermined side surface and the edge area of ​​the bottom close to the predetermined side surface are chamfered to form a first inclined surface A1 and a second inclined surface A2 respectively, so that the predetermined side surface of the magnet 10 and the first inclined surface A1 form a first predetermined angle α greater than 90 degrees, and the predetermined side surface and the second inclined surface A2 also form an angle α with each other. Correspondingly, the conductive terminal is also designed adaptively. Specifically, for each conductive terminal, the middle portion thereof forms a second predetermined angle (hereinafter referred to as angle θ) greater than 90 degrees with the upper end and the lower end respectively; preferably, the first predetermined angle is equal to the second predetermined angle, that is, the first inclined surface of the top of the mounting portion is parallel to the inclined surface of the upper end of the conductive terminal, and the second inclined surface of the bottom of the mounting portion is parallel to the inclined surface of the lower end of the conductive terminal. In this way, it is convenient to assemble the terminal assembly 20 onto the magnet. If more than two types of conductive terminals are included, and the angles θ of different types of conductive terminals are different, the first predetermined angle α is preferably equal to the smallest angle θ.

[0029] Preferably, the length of the first inclined surface A1 and the second inclined surface A2 of the mounting portion in the first direction is the same, which is denoted as L0; the length of the upper end and the lower end of the same conductive terminal in the first direction is the same, and this length is called L value. For example, the length of the upper end and the lower end of the conductive terminal 22 in the first direction is L1, and the length of the upper end and the lower end of the conductive terminal 23 in the first direction is L2. Among them, the first direction refers to the direction from the inner end to the outer end of the upper end (or the lower end), or the outer end to the inner end, wherein the inner end is the end of the upper end (or the lower end) connected to the middle part, and the outer end is the end opposite to the inner end. Preferably, L0 should be smaller than the length of the upper end (or the lower end) of various conductive terminals in the first direction. For example, in an example including two conductive terminals, L0 should be smaller than both L1 and L2, so that each conductive terminal is still in a horizontal state when the terminal assembly is assembled on the magnet.

[0030] Continue to refer Figure 4 and Figure 5 In a more preferred embodiment, for each conductive terminal, its inner height H2 and the height H1 of the mounting portion satisfy: H2 = H1 + gap, the gap value is not greater than 0.2 mm, preferably 0.02-0.06 mm; H1 is the distance between the top horizontal part and the bottom horizontal part of the mounting portion. The gap between H1 and H2 can be used for dispensing glue to bond the conductive terminal and the magnet.

[0031] In a preferred embodiment, the size of the second predetermined angle θ of the conductive terminal satisfies: H = L*tan(θ-90°)≤△. Wherein △ is the preset product coplanarity requirement, generally 0.06-0.13mm, preferably 0.08mm; H is the height difference caused by the inclination of the upper end or the lower end of the conductive terminal relative to the horizontal direction. Figure 3 and Figure 5 In the embodiment shown, there are two types of conductive terminals, and these two conductive terminals have different L values ​​and different θ angles. For the conductive terminal 22, the size of its second predetermined angle θ1 and the size of its L value L1 should satisfy: H3 = L1*tan(θ1-90°)≤△; for the conductive terminal 23, the size of its second predetermined angle θ2 and the size of its L value L2 should satisfy: H4 = L2*tan(θ2-90°)≤△. In this way, the approximate value of the second predetermined angle (θ angle) of the terminal can be determined according to the preset coplanarity requirement △ and the L value of the terminal, and then a terminal that is easy to assemble and meets the design requirements can be designed. In addition, in Figure 3 and Figure 5 In the embodiment shown, there are two different terminals. In order to optimize the appearance of the product, |H3-H4|<△ can be further satisfied.

[0032] Continue to refer Figure 3In a preferred embodiment, the insulating connector 21 of the terminal assembly is an injection molded body, such as phenolic plastic, which is generally formed by injection molding. The material generally has high resistivity, low dielectric constant, good chemical stability, and a temperature resistance of generally above 300 degrees. The several conductive terminals are fixedly connected to the injection molded body through an injection molding process. Generally speaking, the minimum terminal spacing should be maintained at 0.3mm, preferably 0.45-0.6mm; the terminal thickness should generally be maintained at a minimum of 0.05mm, preferably 0.15-0.25mm. The electrode width and area of ​​the upper and lower ends of the same conductive terminal are generally consistent, and the transverse cross-sectional area of ​​the upper and lower ends is generally larger than the vertical cross-sectional area of ​​the middle part. Preferably, the transverse cross-sectional area of ​​the upper and lower ends is more than twice the vertical cross-sectional area of ​​the middle part. In addition, preferably, the width dimension W of the insulating connector 21 is preferably consistent with the outer dimensions of the magnet in the same direction to facilitate assembly and positioning. The magnet 10 includes magnetic powder and copper terminals 11. The copper terminals 11 are pressed together with the magnetic powder when the magnetic powder is pressed into shape. The copper terminals 11 protrude from the surface of the magnet by a predetermined height. The predetermined height enables the copper terminals 11 to form a coplanar terminal group with the terminals of the terminal assembly, and a welding board is applied; the thickness of the insulating connector is ≤ the thickness of the copper terminal, and does not affect the overall external dimensions of the product; the height of the insulating connector is ≤ H1.

[0033] like Figure 4 When the magnet 10 and the terminal assembly 20 are assembled, the glue 30 is preferably applied to the first inclined surface A1 and the second inclined surface A2 of the mounting portion to prevent the glue from overflowing.

[0034] above Figures 2 to 5 In the embodiment shown, the terminal assembly is in the shape of a straight line, and one terminal assembly can be assembled corresponding to one side of the magnet. It should be understood that the terminal assembly can also be in the shape of an L assembled corresponding to two adjacent sides of the magnet, and its insulating connector is in the shape of an L; or it can be as follows Figure 6 The U-shaped insulating connector 21' is U-shaped and assembled corresponding to the three sides of the magnet to form a Figure 7 In the assembled inductor shown, the exemplary terminal assembly includes three different conductive terminals.

[0035] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art of the present invention, several equivalent substitutions or obvious variations can be made without departing from the concept of the present invention, and the performance or use is the same, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. An assembled inductor, characterized in that: The invention comprises: a magnet and a terminal assembly, wherein the terminal assembly comprises an insulating connector and a plurality of conductive terminals connected to the insulating connector, and the plurality of conductive terminals are arranged at intervals on the insulating connector; The magnet is configured to form a mounting portion adapted to the terminal assembly at its predetermined side surface and the top and bottom edges connected to the predetermined side surface, for assembling the terminal assembly; wherein the top and bottom of the mounting portion are respectively recessed in the top and bottom surfaces of the magnet.

2. The assembled inductor according to claim 1, characterized in that: A first edge region of the top of the mounting portion close to the predetermined side surface and a second edge region of the bottom close to the predetermined side surface respectively form a first predetermined angle greater than or equal to 90 degrees with the predetermined side surface; The plurality of conductive terminals include at least one conductive terminal of the same shape; Each of the conductive terminals comprises: a middle portion connected to the insulating connector, and an upper end portion and a lower end portion respectively connected to opposite ends of the middle portion; The middle portion forms a second predetermined angle greater than or equal to 90 degrees with the upper end portion and the lower end portion respectively.

3. The assembled inductor according to claim 2, characterized in that: In a first direction, the length of the first edge area is smaller than the length of the upper end, and the length of the second edge area is smaller than the length of the lower end; wherein the first direction is a direction from the inner end to the outer end of the upper end or the lower end, or from the outer end to the inner end, wherein the inner end is an end connected to the middle part, and the outer end is an end opposite to the inner end.

4. The assembled inductor according to claim 3, characterized in that: The length of the first edge area in the first direction is equal to the length of the second edge area in the first direction; the length of the upper end of the conductive terminal in the first direction is equal to the length of the lower end in the first direction, and the length value is recorded as L; the first predetermined angle is equal to the second predetermined angle.

5. The assembled inductor according to claim 4, characterized in that: The inner height H2 of the middle portion and the height H1 of the mounting portion satisfy: H2=H1+gap, the gap value is no more than 0.2 mm, and H1 is the distance between the top horizontal portion and the bottom horizontal portion of the mounting portion.

6. The assembled inductor according to claim 4, characterized in that: The magnitude of the second predetermined angle θ of the conductive terminal satisfies: L*tan(θ-90°)≤△, wherein △ is a preset product coplanarity requirement.

7. The assembled inductor according to claim 2, characterized in that: The terminal assembly and the magnet are bonded and fixed by glue.

8. The assembled inductor according to claim 2, characterized in that: The transverse cross-sectional areas of the upper end and the lower end of the conductive terminal are both more than twice the vertical cross-sectional area of ​​the middle portion.

9. The assembled inductor according to claim 1, characterized in that: The arrangement interval of the plurality of conductive terminals on the insulating connector is not less than 0.3 mm; the thickness of the conductive terminals is not less than 0.05 mm.

10. The assembled inductor according to claim 1, characterized in that: The magnet comprises magnetic powder and copper terminals. The copper terminals are pressed together with the magnetic powder during compaction and protrude from the surface of the magnet by a predetermined height.

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