Common mode inductor

Abstract

The common mode inductor comprises a magnetic core, a metal terminal and a cover plate, the magnetic core comprises a middle column and end pole plates connected to the two ends of the middle column, a coil is wound around the middle column, and the coil is composed of at least one wire; the metal terminals are arranged on the lower surface of the end polar plate; two ends of the lead are respectively connected with the two metal terminals; the cover plate is arranged on the upper surface of the magnetic core, a slotted hole penetrating through the cover plate is formed in the cover plate, the slotted hole is opposite to the upper surface of the end polar plate, and the slotted hole is filled with UV glue, so that the cover plate is bonded with the upper surface of the end polar plate through the slotted hole. According to the scheme, the bonding efficiency between the magnetic core and the cover plate can be improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of inductor technology, and specifically to a common-mode inductor. Background Art

[0002] In modern electronic devices, square ring common-mode products are widely used for electromagnetic interference suppression and signal integrity protection. The basic structure of this product typically includes electrodes, a magnetic core, and a cover. The fixed connection between the core and the cover is crucial to ensure the performance and reliability of the device under various operating conditions.

[0003] Currently, there are two main methods for bonding the cover plate to the magnetic core on the market. The first method uses epoxy resin glue for heat curing. While this method provides good bond strength, it has a long curing cycle, typically requiring baking for more than an hour. This not only prolongs the production cycle but also may affect production efficiency and cost control. The second method is to design clips on the cover plate to snap into the slots on the magnetic core. While this structure allows for relatively convenient assembly, it has a relatively high manufacturing cost. In addition, the clips are prone to breakage and failure when subjected to stress, affecting the stability and performance of the entire product.

[0004] Therefore, both existing connection methods have their own limitations, and there is an urgent need to develop a new fixed connection solution to improve production efficiency, reduce costs, and enhance the overall reliability and durability of the product. Utility Model Content

[0005] An embodiment of the present application provides a common-mode inductor that can improve the bonding efficiency between the magnetic core and the cover plate.

[0006] An embodiment of the present application provides a common-mode inductor, including:

[0007] A magnetic core, the magnetic core comprising a center column and end plates connected to both ends of the center column, a coil wound around the center column, the coil being composed of at least one conducting wire;

[0008] Metal terminals, the metal terminals being arranged on the lower surface of the end plate, and the two ends of the wire being connected to the two metal terminals respectively;

[0009] A cover plate is arranged on the upper surface of the magnetic core, and a slot hole is provided on the cover plate that passes through the cover plate. The slot hole is arranged opposite to the upper surface of the end plate, and the slot hole is filled with UV glue so that the cover plate is bonded to the upper surface of the end plate through the slot hole.

[0010] In the common-mode inductor provided in an embodiment of the present application, the end plate has a first groove on the side facing away from the middle column, and the cover plate is provided with a first positioning boss on the side facing the magnetic core. The first positioning boss is arranged opposite to the first groove so that the positioning function is achieved through the mutual cooperation between the first positioning boss and the first groove.

[0011] In the common-mode inductor provided in an embodiment of the present application, the center column includes a first sub-center column and a second sub-center column arranged opposite to each other, and a gap is provided between the first sub-center column and the second sub-center column. A second positioning boss is provided on the side of the cover plate facing the magnetic core, and the second positioning boss is arranged opposite to the gap so that the positioning function is realized by the mutual cooperation between the second positioning boss and the gap.

[0012] In the common-mode inductor provided in an embodiment of the present application, the end plate and the middle column around which the coil is wound form a second groove, and a third positioning boss is provided on the side of the cover plate facing the magnetic core. The third positioning boss is arranged opposite to the second groove so that the positioning function is realized by the mutual cooperation between the third positioning boss and the second groove.

[0013] In the common-mode inductor provided in the embodiment of the present application, the distance between the first positioning boss and the second positioning boss is greater than or equal to the width of the end plate at the first groove.

[0014] In the common-mode inductor provided in the embodiment of the present application, the distance between the first positioning boss and the second positioning boss is equal to the width of the end plate at the first groove.

[0015] In the common-mode inductor provided in the embodiment of the present application, the cross-section of the slot is trapezoidal.

[0016] In the common-mode inductor provided in the embodiment of the present application, the angle between the hypotenuse of the slot and the upper surface of the end plate is 100° to 120°.

[0017] In summary, the common-mode inductor provided in the embodiment of the present application includes a magnetic core, a metal terminal and a cover plate, wherein the magnetic core includes a center column and an end plate connected to both ends of the center column, a coil is wound on the center column, and the coil is composed of at least one wire; the metal terminal is arranged on the lower surface of the end plate, and the two ends of the wire are respectively connected to the two metal terminals; the cover plate is arranged on the upper surface of the magnetic core, and a slot is provided on the cover plate that passes through the cover plate, and the slot is arranged opposite to the upper surface of the end plate, and the slot is filled with UV glue so that the cover plate is bonded to the upper surface of the end plate through the slot. This solution realizes rapid bonding between the cover plate and the magnetic core and provides strong bonding force by providing a slot that passes through the cover plate and is arranged opposite to the end plate on the cover plate, and then filling the slot with UV glue. That is, this solution can improve the bonding efficiency between the magnetic core and the cover plate, and improve the reliability of the common-mode inductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 Schematic diagram of the structure of the common-mode inductor provided in an embodiment of the present application.

[0020] Figure 2 Schematic diagram of another structure of the common-mode inductor provided in an embodiment of the present application.

[0021] Figure 3 It is a structural schematic diagram of the cover plate provided in an embodiment of the present application.

[0022] Figure 4 This is a schematic diagram of the cross-sectional structure of the common-mode inductor provided in the embodiment of the present application. DETAILED DESCRIPTION

[0023] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0024] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" as used in this application includes any and all combinations of one or more of the relevant listed items.

[0025] It should be understood that when an element or layer is referred to as being "on," "adjacent to," "connected to," or "coupled to" another element or layer, it can be directly on, adjacent to, connected to, or coupled to the other element or layer, or there can be intervening elements or layers. Conversely, when an element is referred to as being "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" another element or layer, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms are used solely to distinguish one element, component, region, layer, or portion from another element, component, region, layer, or portion and are not to be understood as indicating or implying relative importance.

[0026] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," "above," "below," "upper," "lower," "upper," "lower," etc., may be used herein for convenience of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that in addition to the orientations shown in the figures, the spatially relative terms are intended to also include different orientations of the device in use and operation. For example, if the device in the drawings is turned over, then the elements or features described as "under the other elements" or "under it" or "under it" will be oriented as "on" the other elements or features. Thus, the exemplary terms "under" and "under" can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other orientations) and the spatial descriptors used herein are interpreted accordingly. In addition, terms such as "first," "second," etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0027] Currently, there are two main methods for bonding the cover plate to the magnetic core on the market. The first method uses epoxy resin glue for heat curing. While this method provides good bond strength, it has a long curing cycle, typically requiring baking for more than an hour. This not only prolongs the production cycle but also may affect production efficiency and cost control. The second method is to design clips on the cover plate to snap into the slots on the magnetic core. While this structure allows for relatively convenient assembly, it has a relatively high manufacturing cost. In addition, the clips are prone to breakage and failure when subjected to stress, affecting the stability and performance of the entire product.

[0028] Therefore, both existing connection methods have their own limitations, and there is an urgent need to develop a new fixed connection solution to improve production efficiency, reduce costs, and enhance the overall reliability and durability of the product.

[0029] Based on this, the embodiment of the present application provides a common-mode inductor. The technical solutions shown in the present application will be described in detail below through specific embodiments. It should be noted that the order of description of the following embodiments does not limit the priority order of the embodiments.

[0030] See also Figure 1-Figure 2 , Figure 1 and Figure 2 Schematic diagram of the structure of the common-mode inductor provided in an embodiment of the present application. The common-mode inductor may include a magnetic core 1, a metal terminal 2 and a cover 3.

[0031] The magnetic core 1 includes a center column 11 and end plates 12 connected to both ends of the center column 11 . A coil 13 is wound around the center column 11 , and the coil 13 is composed of at least one conducting wire.

[0032] The magnetic core 1 can be made of ferrite or metal powder core materials, which have excellent magnetic properties and low loss. The size and shape of the center leg 11 and end plates 12 can be designed based on the application and the required magnetic flux of the common-mode inductor. For example, the cross-sectional area of ​​the center leg 11 can be designed to increase the magnetic flux capacity, while the thickness of the end plates 12 can be appropriately increased to improve the magnetic conductivity of the magnetic circuit and reduce the risk of magnetic saturation.

[0033] It should be noted that the wire can be copper wire or aluminum wire to provide good electrical conductivity. The diameter of the wire and the number of turns of the coil 13 can be selected according to the intended use of the common-mode inductor and the required inductance value. In addition, the winding method of the coil 13 can be tightly wound or loosely wound to adapt to different inductance characteristics and thermal management requirements. Tight winding can reduce the capacitance effect between the coils 13, while loose winding helps to dissipate heat and prevent overheating. In some cases, in order to further optimize performance, the surface of the wire can be coated with an insulating layer to reduce leakage between adjacent turns and improve the overall insulation performance.

[0034] In some embodiments, center column 11 may include a first sub-center column (not shown) and a second sub-center column (not shown) disposed opposite each other. It is understood that a gap exists between the first sub-center column and the second sub-center column. In this case, coil 13 may include a first sub-coil (not shown) and a second sub-coil (not shown), wherein the first sub-coil is wound around the first sub-center column and the second sub-coil is wound around the second sub-center column.

[0035] The metal terminals 2 are disposed on the lower surface of the terminal plate 12 , and both ends of the wire are connected to the two metal terminals 2 respectively.

[0036] Among them, the cover plate 3 is arranged on the upper surface of the magnetic core 1, and a slot 31 is provided on the cover plate 3 that passes through the cover plate 3. The slot 31 is arranged opposite to the upper surface of the end plate 12, and the slot 31 is filled with UV glue 4 so that the cover plate 3 is bonded to the upper surface of the end plate 12 through the slot 31.

[0037] It is understandable that the cover plate 3 is capable of transmitting ultraviolet light to ensure that the UV glue 4 is cured.

[0038] like Figure 3 As shown, the end plate 12 has a first groove 121 on the side facing away from the center column 11, and the cover plate 3 is provided with a first positioning boss 32 on the side facing the magnetic core 1. The first positioning boss 32 is arranged opposite to the first groove 121, so that the positioning function is realized by the mutual cooperation between the first positioning boss 32 and the first groove 121.

[0039] In one embodiment, a second positioning boss 33 is provided on the side of the cover plate 3 facing the magnetic core 1 . The second positioning boss 33 is arranged opposite to the gap (not shown in the figure) so that the positioning function is further achieved through the cooperation between the second positioning boss 33 and the gap.

[0040] It is understood that in order to achieve the positioning function during the assembly process, the spacing between the first positioning boss 32 and the second positioning boss 33 is greater than or equal to the width of the end plate 12 at the first groove 121. Preferably, the spacing between the first positioning boss 32 and the second positioning boss 33 is equal to the width of the end plate 12 at the first groove 121, so that the cover plate 3 can be precisely clamped onto the magnetic core 1 through the first positioning boss 32 and the second positioning boss 33, facilitating subsequent bonding and fixing.

[0041] In some embodiments, the end plate 12 and the middle column 11 around which the coil 13 is wound form a second groove (not shown in the figure), and a third positioning boss 34 is provided on the side of the cover plate 3 facing the magnetic core 1. The third positioning boss 34 is arranged opposite to the second groove so that the positioning function is realized by the cooperation between the third positioning boss 34 and the second groove.

[0042] It is understood that the cover plate 3 may be provided with one or more of the first positioning boss 32, the second positioning boss 33, and the third positioning boss 34. For example, the cover plate 3 may be provided with only one of the first positioning boss 32, the second positioning boss 33, and the third positioning boss 34. Alternatively, the cover plate 3 may be provided with any two of the first positioning boss 32, the second positioning boss 33, and the third positioning boss 34. Alternatively, the cover plate 3 may be provided with all three of the first positioning boss 32, the second positioning boss 33, and the third positioning boss 34.

[0043] like Figure 4 As shown, the cross-section of the slot 31 is trapezoidal. It is understood that the design of the angle θ between the hypotenuse of the slot 31 and the upper surface of the end plate 12 is crucial to the curing process of the UV adhesive 4. The size of the angle θ directly affects the fluidity of the UV adhesive 4 and the bond strength after curing. If the angle θ is too large, the UV adhesive 4 may be unevenly distributed during the curing process, affecting the bonding effect; if the angle θ is too small, it may not provide sufficient space for the UV adhesive 4 to fully flow, also affecting the bonding quality. Therefore, selecting the appropriate angle θ is one of the key factors in ensuring a secure bond between the magnetic core 1 and the cover plate 3. In the embodiment of the present application, the angle θ between the hypotenuse of the slot 31 and the upper surface of the end plate 12 is 100° to 120°, so that the adhesive 4 UV filled in the slot 31 can provide adhesion while enhancing the structure's pull-out and shear forces. For example, the angle θ can be 100°, 110°, 115°, or 120°.

[0044] In summary, the common-mode inductor provided in the embodiment of the present application includes a magnetic core 1, a metal terminal 2 and a cover plate 3, wherein the magnetic core 1 includes a middle column 11 and an end plate 12 connected to both ends of the middle column 11, a coil 13 is wound on the middle column 11, and the coil 13 is composed of at least one wire; the metal terminal 2 is arranged on the lower surface of the end plate 12, and the two ends of the wire are respectively connected to the two metal terminals 2; the cover plate 3 is arranged on the upper surface of the magnetic core 1, and a slot 31 is provided on the cover plate 3 that passes through the cover plate 3, and the slot 31 is arranged opposite to the upper surface of the end plate 12, and the slot 31 is filled with UV glue 4 so that the cover plate 3 is bonded to the upper surface of the end plate 12 through the slot 31. This solution realizes rapid bonding between the cover plate 3 and the magnetic core 1 and provides strong bonding force by providing a slot 31 that passes through the cover plate 3 and is arranged opposite to the end plate 12 on the cover plate 3, and then filling the slot 31 with UV glue 4. That is, this solution can improve the bonding efficiency between the magnetic core 1 and the cover plate 3 and improve the reliability of the common mode inductor.

[0045] The common-mode inductor provided in this application is introduced in detail above. Specific examples are used in this application to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the core idea of ​​this application; at the same time, for technical personnel in this field, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A common mode inductor, characterized in that: include: A magnetic core, the magnetic core comprising a center column and end plates connected to both ends of the center column, a coil wound around the center column, the coil being composed of at least one conducting wire; Metal terminals, the metal terminals being arranged on the lower surface of the end plate, and the two ends of the wire being connected to the two metal terminals respectively; A cover plate is arranged on the upper surface of the magnetic core, and a slot hole is provided on the cover plate that passes through the cover plate. The slot hole is arranged opposite to the upper surface of the end plate, and the slot hole is filled with UV glue so that the cover plate is bonded to the upper surface of the end plate through the slot hole.

2. The common-mode inductor according to claim 1, wherein: The end plate has a first groove on the side facing away from the center column, and the cover plate has a first positioning boss on the side facing the magnetic core. The first positioning boss is arranged opposite to the first groove so that the positioning function is achieved through the cooperation between the first positioning boss and the first groove.

3. The common-mode inductor according to claim 2, wherein: The center column includes a first sub-center column and a second sub-center column arranged opposite to each other, and a gap is provided between the first sub-center column and the second sub-center column. A second positioning boss is provided on the side of the cover plate facing the magnetic core, and the second positioning boss is arranged opposite to the gap so that the positioning function is realized by the mutual cooperation between the second positioning boss and the gap.

4. The common mode inductor according to claim 1 or 3, characterized in that: The end plate and the middle column around which the coil is wound form a second groove, and a third positioning boss is provided on the side of the cover plate facing the magnetic core. The third positioning boss is arranged opposite to the second groove so that the positioning function is realized by the cooperation between the third positioning boss and the second groove.

5. The common-mode inductor according to claim 3, wherein: The distance between the first positioning boss and the second positioning boss is greater than or equal to the width of the end plate at the first groove.

6. The common-mode inductor according to claim 5, wherein: The distance between the first positioning boss and the second positioning boss is equal to the width of the end plate at the first groove.

7. The common-mode inductor according to claim 1, wherein: The cross section of the slot is trapezoidal.

8. The common-mode inductor according to claim 6, wherein: The included angle between the oblique side of the slot and the upper surface of the end plate is 100° to 120°.

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