Cable connection assembly

Abstract

The utility model provides a kind of cable connection assembly, it includes circuit board, at least two cables electrically connected with circuit board, cover body fixed on circuit board and partly cover cable, cable includes the core wire of transmission electric signal, insulating layer of wrapping core wire and metal shielding layer of wrapping insulating layer, a part of core wire is exposed to insulating layer, and electrically connected with circuit board, cover body has at least two cover structures, cover structure is made of metal material, each cover structure covers a cable;Cover structure includes end wall, a pair of side walls and top wall connected together;Cover structure is fixed on circuit board by a pair of side walls, and cover the connecting position of core wire and circuit board and part insulating layer, cable extends from the opposite end of end wall, metal shielding layer is electrically connected with cover structure.The utility model cable connection assembly can effectively avoid crosstalk.

Description

Technical Field

[0001] This utility model relates to the field of data communication, and in particular to a cable connection component. Background Technology

[0002] Large-scale AI model training requires high-speed interconnection of thousands of GPUs, creating numerous short-distance (e.g., 2 to 7 meters) connection needs within clusters (e.g., between servers and top-of-rack switches, and across racks). High-speed cable connection components (e.g., active and passive copper cables) are widely used due to their low cost. When multiple cables transmitting high-frequency or high-speed signals are densely connected to the same circuit board, the electromagnetic fields of adjacent cables couple, causing crosstalk and resulting in data errors or signal distortion. As the data transmission rate of high-speed lines increases, the problem of data errors or distortion becomes increasingly severe. Utility Model Content

[0003] The purpose of this invention is to provide a cable connection component that can effectively avoid crosstalk.

[0004] To achieve the aforementioned utility model objective, this utility model provides a cable connection assembly. The cable connection assembly includes a circuit board, at least two cables electrically connected to the circuit board, and a cover fixed to the circuit board and partially covering the cables. Each cable includes a core wire for transmitting electrical signals, an insulating layer encasing the core wire, and a metal shielding layer encasing the insulating layer. A portion of the core wire is exposed above the insulating layer and electrically connected to the circuit board. The cover has at least two covering structures made of metal, each covering structure corresponding to one cable. Each covering structure includes an end wall, a pair of side walls, and a top wall connected together. The covering structure is fixed to the circuit board via the pair of side walls and covers the connection point between the core wire and the circuit board and part of the insulating layer. The cable extends from the end opposite to the end wall, and the metal shielding layer is electrically connected to the covering structure.

[0005] As a further improvement of this utility model, the top wall is provided with a through hole extending through the top wall along its wall thickness direction, and the metal shielding layer is electrically connected to the top wall through a conductive material housed in the through hole.

[0006] As a further improvement of this utility model, the covering structure also has a welding part connected to both sides of the pair of sidewalls, and the sidewalls are electrically connected to the circuit board through the welding part.

[0007] As a further improvement of this utility model, the circuit board is provided with pads electrically connected to the core wire, the core wire has a bent portion, and the cable connection assembly also has a pad disposed on the upper surface of the circuit board. The pad is located between the core wire and the circuit board, and the bent portion is used to absorb the height difference between the pad and the upper surface of the circuit board. The height between the portion of the core wire located on the pad and adjacent to the metal shielding layer and the circuit board is the same as the common thickness of the insulation layer and the metal shielding layer between the core wire and the circuit board.

[0008] As a further improvement of this utility model, the pad has a recessed receiving groove on its upper side, the receiving groove being adapted to accommodate the core wire to house it therein, the receiving groove including a first receiving groove and a second receiving groove that are connected to each other in the extension direction of the cable; the first receiving groove is disposed close to the end wall relative to the second receiving groove, the axial direction of the first receiving groove is inclined to the plane where the circuit board is located; the axial direction of the second receiving groove is parallel to the plane where the circuit board is located.

[0009] As a further improvement of this utility model, the cable connection assembly also has a base fixed on the circuit board, the pad is fixed on the base, the cover structure is at least partially connected to the base, and the metal shielding layer is attached to the base.

[0010] As a further improvement of this utility model, the base is provided with an opening, the solder pads on the circuit board are located in the opening, and the core wires are soldered to the solder pads through the opening.

[0011] As a further improvement of this utility model, the base has a flat plate portion, the opening is disposed on the flat plate portion, the flat plate portion also has an arched portion that arches upward to form a gap space with the circuit board, the arched portion is located on the side of the opening away from the wire outlet side of the shielding structure, and is disposed adjacent to the opening, and the end wall abuts against the arched portion.

[0012] As a further improvement of this utility model, the base has a flat plate portion and a limiting portion protruding from the flat plate portion. The limiting portions are arranged in groups, and two limiting portions arranged opposite each other constitute a group to clamp and fix a corresponding cable.

[0013] As a further improvement of this utility model, the cover has a connecting wall that connects adjacent covering structures.

[0014] The beneficial effects of this utility model are as follows: This cable connection assembly provides a higher level of independent shielding for each cable through a corresponding shielding structure, reducing crosstalk between signal channels and ensuring signal transmission integrity, thus making it suitable for higher-speed signal transmission standards. The shielding structure covers the connection points between the core wire and the circuit board, as well as part of the insulation layer, and electrically connects the metal shielding layer and the shielding structure, thereby improving shielding integrity and preventing signal leakage or interference from the end wall direction. Attached Figure Description

[0015] Figure 1 This is a perspective view of the first embodiment of the cable connection assembly of this utility model.

[0016] Figure 2 yes Figure 1 An exploded 3D view of the cable connection assembly shown.

[0017] Figure 3 yes Figure 1 The diagram shows a 3D view of the cable connection assembly separating the cover from the circuit board.

[0018] Figure 4 This is a perspective view of the second embodiment of the cable connection assembly of this utility model.

[0019] Figure 5 yes Figure 4 The diagram shows a partial exploded view of the cable connection assembly. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the protection scope of the present invention.

[0021] The terms used herein, such as “above,” “over,” “below,” and “under,” indicating spatial relative position, are for illustrative purposes to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. These terms may be intended to include different orientations of the device in use or operation other than those shown in the figures. For example, if the device in the figures is flipped, a unit described as being “below” or “under” another unit or feature would be “above” that unit or feature. Therefore, the exemplary term “below” can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or otherwise), and the spatially related descriptive terms used herein will be interpreted accordingly.

[0022] like Figures 1 to 3The image shown is a first embodiment of the cable connection assembly 100 of this utility model. Figures 4 to 5 The diagram shows a second embodiment of the cable connection assembly 100 of this utility model. In the first and second embodiments of the cable connection assembly 100 of this utility model, the cable connection assembly 100 includes a circuit board 1, at least two cables 2 electrically connected to the circuit board 1, and a cover 3 fixed to the circuit board 1 and partially covering the cables 2. The cover 3 covers the electrical connection portion between the cables 2 and the circuit board 1.

[0023] For ease of explanation, the following description will take the mounting direction of the cover 3 on the circuit board 1 as the height direction, the extension direction of the cable 2 from the cover 3 as the rear direction, and the arrangement direction of the cable 2 as the horizontal direction.

[0024] Please refer to Figures 1 to 2 As shown, circuit board 1 has pads 12 that are electrically connected to cable 2. In this embodiment, circuit board 1 is a multilayer circuit board. Circuit board 1 also has signal traces 13 connected to pads 12.

[0025] At least two cables 2 are arranged side by side. Each cable 2 includes a core wire 21 for transmitting electrical signals. The core wire 21 is mechanically and electrically connected to a corresponding pad 12 on the circuit board 1. Specifically, in this embodiment, the core wire 21 and the pad 12 are soldered together using solder paste G.

[0026] Cable 2 also includes an insulation layer 23 that wraps around the core wire 21. A portion of the core wire 21 is exposed outside the insulation layer 23 and is electrically connected to the circuit board 1. Cable 2 also has a metal shielding layer 24. The metal shielding layer 24 is wrapped around the outside of the insulation layer 23.

[0027] Please refer to Figures 1 to 3 As shown, the cover 3 has at least two covering structures 31. The covering structures 31 are made of metal. Each covering structure 31 covers one cable 2. The covering structure 31 includes an end wall 311, a pair of side walls 312, and a top wall 313 connected together. The covering structure 31 is fixed to the circuit board 1 by the pair of side walls 312, and covers the connection point between the core wire 21 and the circuit board 1, as well as part of the insulation layer 23. The cable 2 extends from the end opposite to the end wall 311. The metal shielding layer 24 is electrically connected to the covering structure 31.

[0028] A pair of sidewalls 312 are spaced apart in the direction in which the cables 2 are arranged. Each cover structure 31 also has an outlet 316 for the cable 2 to extend out. The outlet 316 is disposed opposite to the end wall 311 at both ends in the extension direction of the cable 2.

[0029] Thus, by providing a shielding structure 31 corresponding to each cable 2, a higher level of independent shielding environment is provided for each cable 2, reducing crosstalk between signal channels and ensuring the integrity of signal transmission, making it suitable for higher-speed signal transmission standards. The shielding structure 31 covers the connection between the core wire 21 and the circuit board 1, as well as part of the insulation layer 23, and electrically connects the metal shielding layer 2 and the shielding structure 31, thereby improving the integrity of the shielding and preventing signal leakage or interference from the end wall 311.

[0030] The top wall 313 is provided with a through hole 3132 extending through the top wall 313 along its wall thickness direction. The metal shielding layer 23 is electrically connected to the top wall 313 through a conductive material 4 housed in the through hole 3132.

[0031] In this way, by electrically connecting the shielding structure 31 and the metal shielding layer 23 of the cable 2 through the conductive material 4 housed in the through hole 3132 on the shielding structure 31, a low-impedance grounding path can be achieved, ensuring the continuity of the shielding effect, thereby forming a complete and closed shielding system, which greatly improves the electromagnetic compatibility performance of the entire cable connection assembly 100.

[0032] Furthermore, the adjacent sidewalls 312 of two adjacent cover structures 31 are spaced apart in the direction of cable 2 arrangement. Each cover structure 31 also has a solder joint 315 connecting the two sides of a pair of sidewalls 312. The sidewalls 312 are electrically connected to the circuit board 1 through the solder joints 315. In this embodiment, the solder joints 315 are formed by bending from the corresponding sidewalls 312.

[0033] In some embodiments, the conductive material 4 may be conductive adhesive (e.g., silver paste) or solder.

[0034] Please refer to Figures 2 to 3 As shown, the core wire 21 has a bent portion. The insulation layer 23 and the metal shielding layer 24 on the front side of the cable 2 are both stripped, resulting in a height difference between the electrical connection portion of the core wire 21 to the pad 12 and the portion of the core wire 21 still covered within the insulation layer 23, thus forming the bent portion. The cable connection assembly 100 also has a pad 5 disposed on the upper surface of the circuit board 1. The pad 5 is located between the core wire 21 and the circuit board 1, and the bent portion is used to absorb the height difference between the pad 5 and the upper surface of the circuit board 1. The height between the portion of the core wire 21 located on the pad 5 and adjacent to the metal shielding layer 24 and the circuit board 1 is consistent with the common thickness of the insulation layer 23 and the metal shielding layer 24 between the core wire 21 and the circuit board 1.

[0035] In related technologies, the suspended portion of the bend leads to higher impedance and creates impedance discontinuities. Some of the energy transmitted on core wire 21 is reflected, causing signal distortion, timing errors, and increased insertion loss. Furthermore, traditional cables typically have their core wires directly soldered to the circuit board. To prevent the cable from detaching, glue is usually applied to the soldering point for fixation, which significantly reduces the impedance at the soldering point, making it difficult to adjust the impedance to the desired value.

[0036] In this embodiment, by setting a pad 5 on the upper surface of the circuit board 1 and supporting the pad 5 under the bent portion of the core wire 21, it is not necessary to apply glue to fix the core wire 21 at the soldering point. The impedance at the pad 12 position can be adjusted to achieve the desired value by adjusting the design of the circuit board 1. The pad 5 not only provides support and buffering but also acts as an impedance compensation medium, making the characteristic impedance value of the bent portion closer to the impedance of the cable 2 itself, greatly alleviating impedance abrupt changes. At the same time, it can significantly reduce signal reflection caused by impedance mismatch, further ensuring signal integrity, and enabling the cable connection assembly 100 to be stably used for higher-speed signal transmission.

[0037] Specifically, the pad 5 has a recessed receiving groove 51 on its upper side. The receiving groove 51 is adapted to accommodate the core wire 21. The receiving groove 51 includes a first receiving groove 512 and a second receiving groove 513 that are connected to each other in the extension direction of the cable 2. The first receiving groove 512 is disposed near the end wall 311 relative to the second receiving groove 513. The axial direction of the first receiving groove 512 is inclined to the plane of the circuit board 1. The axial direction of the second receiving groove 513 is parallel to the plane of the circuit board 1.

[0038] Thus, by setting the first receiving groove 512 near the pad 12 to be inclined relative to the plane of the circuit board, the core wire has a smooth arc and a controllable radius of curvature bend within the first receiving groove 512, making the change in characteristic impedance of the core wire smoother. At the same time, the impedance of the core wire bend can be "tuned" by adjusting the depth of the receiving groove 51 and / or adjusting the material of the pad 5 (changing to a material with a different dielectric constant) to match the standard impedance of the cable 2 as closely as possible, thereby achieving a smooth and controllable impedance transition and minimizing reflection.

[0039] In this embodiment, the axial direction of the second receiving groove 513 is parallel to the plane where the circuit board 1 is located. The height of the lowest point of the second receiving groove 513 is the same as the diameter of the core wire 21.

[0040] In another embodiment, the pad 5 has a first surface 501 and a second surface 502 connected to each other in the extension direction of the cable 2. The first surface 501 and the second surface 502 are located on the side of the pad 5 facing away from the circuit board 1. The first surface 501 is an inclined surface set at an angle to the circuit board 1. The core wire 21 rests on the first surface 501 and the second surface 502. That is, in this embodiment, the receiving groove 51 in the previous embodiment may not be provided, and the core wire 21 may be placed directly on the first surface 501 and the second surface 502.

[0041] Similarly, the core wire 21 transitions via the inclined first surface 501, which makes the characteristic impedance change at the bending point more continuous and controllable, effectively disperses impedance abrupt changes, and reduces signal reflection. It also simplifies manufacturing and assembly processes, reduces costs, and improves cable compatibility.

[0042] Furthermore, in some embodiments, the dielectric constant of the pad 5 is in the range of 2-4.

[0043] Please refer to Figures 1 to 3 As shown, in some embodiments of this utility model, the cable connection assembly 100 further includes a base 6 fixed to the circuit board 1. A pad 5 is fixed to the base 6. A cover structure 31 is at least partially connected to the base 6. A metal shielding layer 23 is abutted against the base 6.

[0044] Thus, the base 6 not only secures the pad 5 to the circuit board 1, ensuring it won't shift when pulled or vibrated by the cable 2, thus guaranteeing the long-term stability of the core wire 21's bending shape and impedance control, but also reliably and with low impedance connects the cable 2's metal shielding layer 23 to the circuit board 1, preventing resonance and achieving better electromagnetic shielding. Furthermore, the base 6, in conjunction with the covering structure 23, forms a complete shielding structure, further enhancing the electromagnetic shielding effect.

[0045] In some embodiments, the base 6 is made of metal. The pad 5 is bonded to the upper surface of the base 6, for example, by UV adhesive.

[0046] In this embodiment, the base 6 is soldered onto the circuit board 1. The circuit board 1 has a mounting area around the pads 12, and the base 6 is soldered to the mounting area by surface soldering.

[0047] The base 6 has an opening 601. The pads 12 on the circuit board 1 are located inside the opening 601. The core wire 21 is soldered to the pads 12 through the opening 601.

[0048] Specifically, the base 6 has a flat plate portion 61, and an opening 601 is provided in the flat plate portion 61. The flat plate portion 61 also has an arched portion 612 that arches upward to form a gap space with the circuit board 1. By providing the gap space through the arched portion 612, clearance space is provided so that the signal trace 13 can pass through the gap space. The arched portion 612 is located on the side of the opening 601 away from the wire exit side of the shielding structure 31, and is disposed adjacent to the opening 601. The end wall 311 abuts against the arched portion 612.

[0049] Thus, by providing an arched portion 612 formed by an arch on the flat portion 61, the signal trace 13 can pass through the space below the arched portion 612, avoiding the problems of increased cost and manufacturing complexity caused by setting additional layers inside the circuit board 1 (such as adding a layer in a multilayer board).

[0050] The base 6 also has a limiting portion 63 protruding from the flat plate portion 61. The limiting portions 63 are arranged in groups, with two oppositely arranged limiting portions 63 forming a group to clamp and fix a corresponding cable 2. Each group of limiting portions 63 clamps one cable 2. In this embodiment, there are two cables 2, and two groups of limiting portions 63. In other embodiments, there can be three or more cables 2, and the number of groups of limiting portions 63 is determined according to the number of cables 2.

[0051] Furthermore, in one embodiment, the limiting portion 63 is formed by bending upward from the flat plate portion 61.

[0052] In this embodiment, the base 6 is harder than the cover 3. This allows the harder base 6 to be smoothly fixed to the circuit board 1, while the slightly softer cover 3 ensures reliable soldering.

[0053] Please refer to Figures 1 to 3 This is a first embodiment of the cable connection assembly 100, in which the cover 3 has a connecting wall 34 that connects adjacent cover structures 31. By providing the connecting wall 34, adjacent cover structures 31 can be formed using the same metal sheet.

[0054] A gap is left between the lower end face of the end wall 311 and the circuit board 1. Similar to the arrangement of the arched portion 612, the gap between the lower end face of the end wall 311 and the circuit board 1 can prevent the metal end wall 3111 from pressing against the surface traces on the circuit board 1.

[0055] During installation, first fix the pad 5 to the base 6; apply solder paste to the mounting area of ​​the circuit board 1 and solder the base 6 to the mounting area; then solder the core wire 21 of the cable 2 to the pad 12; finally press the cover 3 onto the outside of the cable 2 from top to bottom and solder it to the base 6 through the soldering part 315 to increase the connection strength.

[0056] In addition, in this embodiment, the cable connection assembly 100 may also have a housing (not shown) that covers the electrical connection parts of the cover 3, the circuit board 1, and the cable 2 to further avoid electromagnetic crosstalk.

[0057] Please refer to Figures 4 to 5 This is a second embodiment of the cable connection assembly 100 of this utility model. In this embodiment, at least two shielding structures 31 are independently arranged. The end wall 311 is seamlessly connected to a pair of side walls 312 and a top wall 313. In this way, each shielding structure 31 forms a completely independent shielding chamber, fundamentally eliminating the path of electromagnetic energy coupling from one channel to an adjacent channel. Even if the signal frequencies and intensities of the two channels differ greatly, they will not interfere with each other.

[0058] The end wall 311 has an upwardly recessed groove 3112 on one side adjacent to the circuit board 1. Similar to the aforementioned arched portion 612, the lower end surface of the end wall 311 is provided with a groove 3112 to prevent the metal end wall 3111 from pressing against the surface traces on the circuit board 1.

[0059] exist Figure 5 In the embodiment shown, each cover structure 31 is soldered to the circuit board 1 via soldering portions 315 provided on both sides thereon; in other embodiments, the cable connection assembly 100 may also include a base, with the soldering portions 315 soldered to the base 6 as in the first embodiment.

[0060] The cable connection assembly 100 of this utility model provides a higher level of independent shielding environment for each cable 2 through a shielding structure 31 corresponding to each cable 2, reducing crosstalk between signal channels and ensuring the integrity of signal transmission, so as to be suitable for higher speed signal transmission standards. The shielding structure 31 covers the connection part between the core wire 21 and the circuit board 1 and part of the insulation layer 23, and electrically connects the metal shielding layer 2 and the shielding structure 31, thereby improving the integrity of shielding and preventing signal leakage or interference from the end wall 311.

[0061] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0062] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model.

Claims

1. A cable connection assembly, the cable connection assembly comprising a circuit board, at least two cables electrically connected to the circuit board, and a cover fixed to the circuit board and partially covering the cables, wherein the cables include a core wire for transmitting electrical signals, an insulating layer wrapping the core wire, and a metal shielding layer wrapping the insulating layer, a portion of the core wire being exposed outside the insulating layer and electrically connected to the circuit board, characterized in that: The cover has at least two covering structures, each covering structure being made of metal material, and each covering structure corresponding to covering one cable. The shielding structure includes an end wall, a pair of side walls, and a top wall that are connected together. The shielding structure is fixed to the circuit board by the pair of side walls and covers the connection position between the core wire and the circuit board and part of the insulation layer. The cable extends from the end opposite to the end wall, and the metal shielding layer is electrically connected to the shielding structure.

2. The cable connection assembly as described in claim 1, characterized in that: The top wall is provided with a through hole that extends through the top wall along its thickness direction, and the metal shielding layer is electrically connected to the top wall through a conductive material housed in the through hole.

3. The cable connection assembly as described in claim 1, characterized in that: The covering structure also has a welded portion connected to both sides of the pair of sidewalls, the sidewalls being electrically connected to the circuit board through the welded portion.

4. The cable connection assembly as described in claim 1, characterized in that: The circuit board has pads electrically connected to the core wire, the core wire has a bent portion, and the cable connection assembly also has a pad disposed on the upper surface of the circuit board. The pad is located between the core wire and the circuit board, the bent portion is used to absorb the height difference between the pad and the upper surface of the circuit board, and the height between the portion of the core wire located on the pad and adjacent to the metal shielding layer and the circuit board is the same as the common thickness of the insulation layer and the metal shielding layer between the core wire and the circuit board.

5. The cable connection assembly as described in claim 4, characterized in that: The pad has a recessed receiving groove on its upper side, the receiving groove being adapted to accommodate the core wire, the receiving groove including a first receiving groove and a second receiving groove that are connected to each other in the extension direction of the cable; the first receiving groove is disposed close to the end wall relative to the second receiving groove, the axial direction of the first receiving groove is inclined to the plane of the circuit board; the axial direction of the second receiving groove is parallel to the plane of the circuit board.

6. The cable connection assembly as described in claim 4, characterized in that: The cable connection assembly also has a base fixed to the circuit board, the pad fixed to the base, the cover structure at least partially connected to the base, and the metal shielding layer abutting the base.

7. The cable connection assembly as described in claim 6, characterized in that: The base has an opening, and the pads on the circuit board are located inside the opening. The core wires are soldered to the pads through the opening.

8. The cable connection assembly as described in claim 7, characterized in that: The base has a flat plate portion, the opening is disposed on the flat plate portion, the flat plate portion also has an arched portion that arches upward to form a gap space with the circuit board, the arched portion is located on the side of the opening away from the wire outlet side of the shielding structure and is disposed adjacent to the opening, and the end wall abuts against the arched portion.

9. The cable connection assembly as described in claim 6, characterized in that: The base has a flat plate portion and a limiting portion protruding from the flat plate portion. The limiting portions are arranged in groups, and two limiting portions arranged opposite each other constitute a group to clamp and fix a corresponding cable.

10. The cable connection assembly as claimed in claim 6, characterized in that: The cover has connecting walls that link adjacent covering structures.

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