A high-speed and stable backplane connector

Abstract

The invention discloses a high-speed and stable backplane connector, comprising a group of axially symmetrical differential pair terminals, a group of U-shaped slot return path terminals, and a U-shaped plastic insulating base. A differential pair terminal pair and a group of U-shaped slot return path terminals constitute a differential pair combination unit. An air hole is arranged on the plastic base of each differential combination unit, located between the U-shaped terminal and the differential pair terminal pair. The primary coupling edge of the differential pair is arranged flat, which improves the signal integrity; the secondary coupling edge of the differential pair is arranged concave and convex to meet the manufacturability.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric connectors, and more specifically, belongs to the field of high-density and high-speed digital communication connectors. Background Art

[0002] In the era of the booming development of 5G (fifth generation mobile communication technology), IOT, big data, cloud, smart driving, smart medical care, smart home, etc., the data transmission rate requirements for various systems and equipment used in high-speed digital communications are getting higher and higher. High-speed digital communication backplane connectors are important basic components of high-speed communication systems and equipment. The signal integrity performance of this connector seriously affects the performance of high-speed digital communication systems and equipment. At present, the single-channel 5Gbps transmission rate backplane connector can no longer meet the requirements of high-speed digital communication systems and equipment for high-speed data transmission rates. Instead, the single-channel transmission rate of the backplane connector is required to reach 10Gbps, 28Gpbs, and then 56Gbps, 122Gbps or even higher.

[0003] However, most of the single-channel high-speed data transmission rates of most domestic backplane connectors are less than 28Gpbs. Therefore, it is very important and necessary to study the backplane connector and its structure and improve the high-speed data transmission rate of the backplane connector. We analyzed and studied the existing backplane connectors, and improved the differential pairs by distinguishing the main coupling edge and the secondary coupling edge of the differential pair, designing the coupling edge in a targeted manner, and using the corresponding processing technology; at the same time, by utilizing the physical properties of air with low dielectric constant and dissipation coefficient, the backplane connector base was improved and optimized. Through the above improvements and optimizations, we have obtained a backplane connector with high-speed and stable performance. This connector has well-matched differential impedance and stable signal integrity performance, thereby improving the single-channel transmission rate of the high-speed data communication backplane connector. Summary of the invention

[0004] The purpose of the present invention is to improve the transmission rate of a high-speed data communication backplane connector and to provide a backplane connector with high-speed and stable performance. The differential impedance and signal stability of the connector composed of the differential pair of terminals can be improved.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A high-speed and stable backplane connector, comprising:

[0007] The base comprises two side wings and a base, the side wings are provided with guide positioning grooves, and the base is provided with a differential pair combination unit array,

[0008] A differential pair of terminals connected to the base, the differential pair of terminals comprising two terminals, the terminals comprising a primary coupling edge and a secondary coupling edge, the edges of the two terminals being aligned with each other,

[0009] The recessed terminal is supported by a base, and comprises a base and side walls symmetrically connected to the base at two sides, wherein the side walls have abutting edges.

[0010] In the above technical solution, the base is a U-shaped insulator, and the differential pair combination unit is provided with air holes.

[0011] In the above technical solution, the differential pair combination unit includes a U-shaped first hole for connecting the loop terminal, and a second hole for connecting the differential line group, and the air hole is arranged between the first hole and the second hole.

[0012] In the above technical solution, the differential pair combination units are distributed on the base in an array, and the position distribution of the odd-numbered columns of the differential pair combination unit columns is staggered with the position distribution of the even-numbered columns.

[0013] In the above technical solution, side wings connected to the base are arranged on two symmetrical sides of the base, and a number of positioning grooves are respectively arranged on the opposite surfaces of the two side wings, and the positioning grooves on one side wing are staggered with the positioning grooves on the other side wing.

[0014] In the above technical solution, the differential pair of terminals includes two terminals axially symmetrically distributed, and the terminals include, from one end to the other end, a first contact portion plugged into a connector, a fixed portion connected to a base, and a second contact portion connected to a circuit board, and the fixed portion of the terminal includes a primary coupling edge with a straight feature and a secondary coupling edge with a concave-convex feature.

[0015] In the above technical solution, the main coupling edge is a straight structure from one end to the other end along the axis of the terminal.

[0016] In the above technical solution, the secondary coupling edge is a continuous concave-convex structure from one end to the other end along the axis of the terminal.

[0017] In the above technical solution, part of the secondary coupling edge is recessed into the edge of the fixed portion of the terminal, the recess amount is greater than zero, the width of the terminal fixed portion is greater than the maximum width of the second contact portion, and each fixed edge is higher than the maximum edge of the second contact portion, the height is greater than zero.

[0018] In the above technical solution, a press-in shoulder is designed on the terminal.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] In order to achieve the purpose of improving the performance of product signal integrity and the stability of signal integrity, the present invention adopts an excellent manufacturing process solution and a good coupling edge design in the important coupling area of ​​the differential pair; and adopts a poor process solution and a relatively poor coupling edge design in the secondary coupling area of ​​the differential pair, and designs the product manufacturability and assembly requirements in this area. This targeted processing of manufacturing process and design not only meets the manufacturability and assembly requirements of the product, but also improves the performance of product signal integrity and the stability of signal integrity.

[0021] In order to achieve the differential impedance matching of the differential pair, the present invention recesses part of the secondary coupling edge into the holding portion of the terminal at the location where the terminal is held by plastic, thereby increasing the impedance of the differential pair and achieving the purpose of good differential impedance matching.

[0022] In order to achieve the purpose of assembly of differential pair terminals, the width of the terminal holding part is designed to be greater than the maximum width of the EON, and each holding edge is higher than the maximum edge of the EON. A pressing shoulder is designed on each terminal so that the differential pair terminals can be pressed into the holding plastic.

[0023] In order to achieve the purpose of improving differential impedance and insertion loss, the present invention utilizes the material properties of air with low dielectric constant and small dissipation coefficient, and sets an air area at the bottom of the U-shaped hole of the differential pair combination unit, and the air area is located between the differential pair hole and the bottom of the U-shaped hole. Since this air area has a low dielectric constant and dissipation coefficient, the coupling between the signal metal conductor differential pair path and the signal U-shaped metal return path is weakened, thereby improving the differential impedance and the insertion loss at the same time.

[0024] In order to achieve the purpose of smooth intermate of connectors, the present invention provides multiple guide positioning grooves on the side wing with guide positioning, and multiple guide positioning grooves on the other side wing with guide positioning; and each positioning guide groove has a specific positional relationship.

[0025] In order to achieve high-density, high-speed data transmission, the present invention distributes the differential pair combination units on the base in an array, and the differential pair combination unit array groups have a specific position staggered arrangement. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0027] Figure 1 It is a schematic diagram of a high-speed, stable-performance backplane connector;

[0028] Figure 2 It is a schematic diagram of differential pair terminals;

[0029] Figure 3 It is a schematic diagram of the primary coupling edge and the secondary coupling edge of the differential pair terminal pair;

[0030] Figure 4 It is a state diagram;

[0031] Figure 5 It is a schematic diagram of the assembly features of the differential pair of terminals;

[0032] Figure 6 It is a schematic diagram of an improved U-shaped insulator base;

[0033] Figure 7 yes Figure 6 Schematic diagram from another perspective;

[0034] Figure 8 is a schematic diagram of a differential pair combination unit;

[0035] Fig. 9 is a schematic diagram of an array of differential pair combination units;

[0036] Fig.10 It is a schematic diagram of a single differential pair of terminals and a U-shaped slot terminal mounted on a plastic base;

[0037] Wherein: 1 is a base, 2 is a differential pair of terminals, 3 is a U-shaped slot terminal, 21, 22 are isolated single terminals, 211, 221 are contact portions, 212, 222 are retaining portions, 213, 223 are EON crimping portions of -PCB, 214, 224 are press-in shoulders, 2121, 2221 are primary coupling edges, 2122, 2222 are secondary coupling edges, b is a recessed amount, 2122_1, 2122_3 and 2222_1, 2222_3 are retaining edges,

[0038] 2122_2 and 2222_2 are recessed edges, w1 and w2 are the widths of the holding parts, and w3 is the width of EON; a1 and a2 are the maximum edge amounts of the holding edges being higher than EON, 12 is a differential pair combination unit comprising a differential pair hole, 121 and 122 are differential pair holes, 123 is a U-shaped hole, 1231 and 1232 are air holes, 13 is a side wing with guiding positioning, 131 and 132 are guiding positioning grooves, 2 is a signal terminal, 14 is another side wing with guiding positioning, 141 and 142 are guiding positioning grooves, 3 is a U-shaped loop terminal, and 12a and 12b are differential pair combination unit array groups. DETAILED DESCRIPTION

[0039] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0040] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0041] Embodiment 1

[0042] like Figure 2 As shown, the differential pair terminal pair 2 is composed of two axisymmetric or approximately axisymmetric terminals 21 and 22, including contact portions 211 and 221 when mated with other connectors, terminal fixing portions 212 and 222 fixed by a plastic base, and EON contact portions 213 and 223 crimped by a PCB.

[0043] like Figure 3 As shown, the main coupling edges 2121 and 2221 of the fixed portion of the differential pair terminal pair 2 are flattened and manufactured using a stamping process, while the secondary coupling edges 2122 and 2222 of the fixed portion of the differential pair terminal pair 2 are mainly designed for manufacturability and use a manufacturing process solution that combines an assembly jig cutting process with a stamping cutting process.

[0044] The secondary coupling edges 2122 and 2222 of the fixing portions 212 and 222 of the differential pair terminal pair 2 are a continuous side surface, on which various features such as grooves, protrusions, barbs, etc. can be provided to prevent the terminals 21 and 22 from exiting the differential pair holes 121 and 122 on the plastic base 1 .

[0045] like Figure 4 As shown, part of the secondary coupling edges 2122_2 and 2222_2 are recessed into the holding edges 2122_1 and 2122_3 and 2222_1 and 2222_3 of the terminal, and the recess amount b is greater than zero. The secondary coupling edges 2122_2 and 2222_2 are cut using an assembly jig. The recessed structure can increase the impedance of the differential pair to achieve a good differential impedance matching.

[0046] like Figure 5 As shown, the widths w1 and w2 of the terminal holding portion are greater than the maximum width w3 of the EON, and each holding edge is higher than the maximum edge of the EON, and the heights a1 and a2 are greater than zero. Pressing shoulders 214 and 224 are designed on each terminal 21 and 22 so that the differential pair of terminals 21 and 22 can be pressed into the positioning holes 121 and 122 on the holding plastic base 1.

[0047] like Figure 6 and Figure 7As shown, the base is a U-shaped insulator, including a base 11 with an array of differential pair combination units 12, a side wing 13 with a guide positioning, and another side wing 14 with a guide positioning. The two side wings are used for guiding and positioning in the non-insertion direction when the connector is mated. In this embodiment, the side wings 13 and 14 are fixedly connected to the base 11 as an integral structure.

[0048] like Figure 8 As shown, the differential pair combination unit 12 includes: a first hole for connecting with the U-shaped loop terminal 3, the first hole is a U-shaped hole 123; a second hole for connecting the differential signal connector, the second hole is two differential pair holes 121, 122; a third hole for vacancy is provided between the bottom edge of the first hole and the second hole, the third hole is an air hole 1231, 1232, and the third hole is connected to the first hole.

[0049] In this embodiment, the two differential pair holes 121 and 122 are symmetrically distributed on the U-shaped surface in the U-shaped hole, and one differential hole corresponds to one air hole. All structures in the entire differential pair combination unit 12 are symmetrically distributed about the central axis.

[0050] like Fig. 9 As described above, a plurality of differential pair combination units 12 are distributed in an array on the base 11, and the differential pair combination units 12 are misaligned with each other, for example, the differential pair combination unit array group 12a of odd columns is misaligned with the differential pair combination unit array group 12b of even columns.

[0051] In this embodiment, if Figure 6 and Figure 7 As shown, a plurality of positioning grooves 131, 132, 141, 142 are provided on the inner side surfaces of the two symmetrical side wings, and the positioning grooves on the two side wings are staggered with each other, so that the base has the functions of guiding and positioning when plugging with the connector.

[0052] like Fig.10 , which is a schematic diagram of docking between the present embodiment and the connector. When the differential signal terminal 2 is connected to the second holes 121, 122, and the U-shaped loop terminal 3 is connected to the first hole 123, since no connection is made in the third holes 1231, 1232, an air wall is formed between the differential signal terminal 2 and the U-shaped loop terminal 3, thereby reducing the coupling between the signal ends, improving the differential impedance, and reducing the insertion loss.

[0053] like Figure 1 As shown, it is a schematic diagram of the overall structure of the connector, in which a number of mutually matching differential pair combination units and U-shaped loop terminals are connected to a U-shaped base and are staggered with respect to each other.

[0054] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A high-speed, stable backplane connector, characterized in that include: A base of a U-shaped insulator, the base comprising two side wings and a base, the side wings are provided with guide positioning grooves, the base is provided with a differential pair combination unit array, the differential pair combination unit is provided with an air hole, the differential pair combination unit comprises a U-shaped first hole for connecting a loop terminal, and a second hole for connecting a differential line group, the air hole is provided between the first hole and the second hole, and the air hole is connected to the first hole; A differential pair of terminals connected to the base, the differential pair of terminals comprising two terminals, the terminals comprising a primary coupling edge and a secondary coupling edge, the edges of the two terminals being aligned with each other; The recessed terminal is supported by a base, and comprises a base and side walls symmetrically connected to the base at two sides, wherein the side walls have abutting edges.

2. A high-speed, stable performance backplane connector according to claim 1, characterized in that The differential pair combination units are distributed on the base in an array, and the position distribution of the odd-numbered columns of the differential pair combination units is staggered with the position distribution of the even-numbered columns.

3. A high-speed, stable performance backplane connector according to claim 1, characterized in that Side wings connected to the base are arranged on two symmetrical sides of the base, and a plurality of positioning grooves are respectively arranged on opposite surfaces of the two side wings, wherein the positioning grooves on one side wing are arranged in a staggered manner with the positioning grooves on the other side wing.

4. A high-speed, stable performance backplane connector according to claim 1, characterized in that The differential pair of terminals includes two terminals distributed in an axially symmetrical manner. From one end to the other end, the terminal includes a first contact portion plugged into a connector, a fixed portion connected to a base, and a second contact portion connected to a circuit board. The fixed portion of the terminal includes a primary coupling edge with a straight feature and a secondary coupling edge with a concave-convex feature.

5. A high-speed, stable performance backplane connector according to claim 4, characterized in that The main coupling edge is a straight structure from one end to the other end along the axis of the terminal.

6. A high-speed, stable performance backplane connector according to claim 4, characterized in that The secondary coupling edge is a continuous concave-convex structure from one end to the other end along the axis of the terminal.

7. A high-speed, stable performance backplane connector according to claim 4, characterized in that Part of the secondary coupling edge is recessed into the edge of the fixed portion of the terminal, the recess amount is greater than zero, the width of the terminal fixed portion is greater than the maximum width of the second contact portion, and each fixed edge is higher than the maximum edge of the second contact portion, the height is greater than zero.

8. A high-speed, stable performance backplane connector according to claim 4, characterized in that The terminal is designed with a press-in shoulder.

Images