Transformer and coil structure of internet access connector
By using four enameled wires to synthesize four-stranded wires in the RJ45 network port connector, the problems of complex wire pack design and high high-frequency defect rate in the prior art are solved, and the effect of simplifying the manufacturing process and improving high-frequency impedance is achieved.
Patent Information
- Application Number
- CN202420345500.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-23
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-02-23
AI Technical Summary
The existing high-speed RJ45 network port connectors with 10G and above are complex in design, the manufacturing process takes a long time, and the thick wire diameter leads to high difficulty in winding of modules and high high-frequency defect rate.
Four enameled wires are used to twist into two twisted pairs, and then twisted to form a four-stranded wire, which is wound on the magnetic ring of the transformer to form primary and secondary coils, simplifying the wire-pack structure and improving the level of automated production.
Reduces leakage inductance, provides a slight distributed capacitance, improves high-frequency impedance, simplifies the wire-pack manufacturing process, and improves the automation level and miniaturization capabilities of the product.
Smart Images
Figure CN222995203U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of connectors, in particular to a structural design of a high-frequency wire package for an RJ45 network port connector of 10G and above. Background Art
[0002] Network connectors are mainly assembled on products such as computer peripherals, servers, routers, and switching devices, and are used for data transmission and peripheral connection, etc., and are widely used in fields such as networks, communications, and automation control.
[0003] The defects of existing network connectors are as follows:
[0004] For existing high-speed RJ45 & network transformers of 10G and above, on the Cable side of the internal wire package, and even on the Cable + phy side (Cable: cable, phy chip: physical layer chip), multi-strand wires are mostly used for signal lines to reduce leakage inductance and improve the skin effect. However, the use of multi-strand wires leads to: 1. The wire package manufacturing process is complex, and a large amount of man-hours are consumed during the process of separating and twisting the wires, and it is almost completely manual work; 2. The multi-strand wire design has a relatively thick wire diameter, which not only makes the winding of the transformer module difficult, with a high short circuit / open circuit defect rate, but also requires a larger magnetic core, which is not conducive to the miniaturization of the product; 3. The frequency of breakage of the enameled wires in the multi-strand wires is high. After breakage, the high frequency will decrease, and the high-frequency defect rate is relatively high. Content of the Utility Model
[0005] In order to solve the problems existing in the prior art, the purpose of the utility model is to provide a transformer.
[0006] To achieve the above object, the utility model adopts the following technical solutions:
[0007] A transformer includes a first magnetic core, and a bundle of four-strand wires is wound around the first magnetic core. The bundle of four-strand wires includes four enameled wires: a first enameled wire, a second enameled wire, a third enameled wire, and a fourth enameled wire.
[0008] The first enameled wire and the second enameled wire are twisted together to form a first twisted pair, the third enameled wire and the fourth enameled wire are twisted together to form a second twisted pair, and the first twisted pair and the second twisted pair are twisted together again to form a bundle of four-strand wires.
[0009] Wherein, the second enameled wire and the fourth enameled wire form a secondary coil, and the first enameled wire and the third enameled wire form a primary coil.
[0010] Further, in some embodiments, the diameters of the first enameled wire, the second enameled wire, the third enameled wire, and the fourth enameled wire are greater than or equal to 0.1 mm, or AWG38 and above.
[0011] Further, in some embodiments, the first enameled wire is provided with a first wire end R and a second wire end r';
[0012] The second enameled wire is provided with a first wire end B and a second wire end b';
[0013] The third enameled wire is provided with a first wire end G and a second wire end g';
[0014] The fourth enameled wire is provided with a first wire end N and a second wire end n';
[0015] After a four-strand wire bundle winds around the first magnetic ring, one end is the four single-wire first wire ends (R, B, G, N) of the first, second, third, and fourth enameled wires on the incoming line side, and the four single-wire first wire ends (R, B, G, N) on the incoming line side are exposed outside the first magnetic ring; the other end is the four single-wire second wire ends (r', b', g', n') of the first, second, third, and fourth enameled wires on the outgoing line side, and the four single-wire second wire ends (r', b', g', n') on the outgoing line side are exposed outside the first magnetic ring;
[0016] The part of the four-strand wire bundle wound around the first magnetic ring between the four single-wire first wire ends (R, B, G, N) and the four single-wire second wire ends (r', b', g', n') remains in a stranded state, and the length L1 of the stranded state retained after the four-strand wire bundle comes out from the inner hole of the first magnetic ring is 2 mm.
[0017] Further, in some embodiments, the first magnetic ring uses a magnetic ring with an outer diameter of 3.5 mm or less, the initial magnetic permeability is 3000 or more, and the number of turns of the winding is not less than 3 turns and not more than 6 turns.
[0018] Further, in some embodiments, the stranding degrees of the first twisted pair, the second twisted pair, and the four-strand wire bundle are all 6 - 34 strands per inch.
[0019] Further, in some embodiments, the second wire end r' of the first enameled wire and the first wire end G of the third enameled wire together form a first center tap;
[0020] The first wire end B of the second enameled wire and the second wire end n' of the fourth enameled wire together form a second center tap.
[0021] A wire package structure of a network interface connector includes the above-mentioned transformer T1 and a common-mode choke T2. The distance L2 between the transformer T1 and the common-mode choke T2 is less than 2.5 mm; the common-mode choke T2 includes a second magnetic ring, and two or three enameled wires are wound around the second magnetic ring. The number of turns of the winding on the first magnetic ring and the second magnetic ring is 3 turns or more.
[0022] Further, in some embodiments, the second magnetic ring is wound with two enameled wires, namely the second enameled wire and the fourth enameled wire.
[0023] Further, in some embodiments, the second magnetic ring is wound with three enameled wires. An additional fifth enameled wire is added to the second magnetic ring. The fifth enameled wire is provided with a first wire end R1 and a second wire end R1'. The fifth enameled wire, the fourth enameled wire, and the second enameled wire are twisted together into a three-strand wire;
[0024] One end of the three-strand wire after being wound around the second magnetic ring is the second wire end R1' of the fifth enameled wire, the first wire end N of the fourth enameled wire, and the second wire end b' of the second enameled wire;
[0025] The first wire end R1 of the fifth enameled wire, the second wire end n' of the fourth enameled wire, and the first wire end B of the second enameled wire form a third center tap.
[0026] Further, in some embodiments, the length L3 of the non-tinned part of the first center tap is less than 5 mm, the total length of the third center tap is less than 6 mm, and the pre-soldering length P3 at the wire end of the third center tap is 1 - 2 mm.
[0027] The utility model is applied to RJ45 integrated transformers T1 network interfaces, Lan-transformers (network transformers T1), network filters, etc. Adopting the wire twisting scheme of first twisting four enameled wires in pairs into two pairs of twisted wires and then twisting them into a four-strand wire can reduce leakage inductance and provide a slight distributed capacitance to improve high-frequency impedance. This four-strand wire can be made by automatic wire twisting, improving the automation level of the wire. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 is a schematic diagram of the principle of an embodiment of the utility model;
[0029] Figure 2 is a schematic diagram of the production of a four-strand wire in an embodiment of the utility model;
[0030] Figure 3 is a schematic circuit diagram of an embodiment of the utility model;
[0031] Figure 4 is a schematic diagram of the winding of a wire package in an embodiment of the utility model.
[0032] MARKING DESCRIPTION:
[0033] The first magnetic ring 11, the second magnetic ring 12, the primary coil 15, the secondary coil 17, the first enameled wire 21, the first center tap 22, the third enameled wire 23, the third center tap 24, the fifth enameled wire 25, the fourth enameled wire 27, the second center tap 28, the second enameled wire 29, the first twisted pair 31, the second twisted pair 32, and a bundle of four-strand wires 33. Detailed implementation manners
[0034] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with specific embodiments of the present utility model and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.
[0035] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. In the description of the present utility model, "a plurality" means two or more, unless otherwise specifically defined.
[0036] Please refer to the attached Figure 1 , Figure 1The implementation principle of the present utility model is shown. This application includes a transformer T1 and a common-mode choke T2. A first magnetic ring 11 (a circular magnetic ring) with a central through-hole is provided on the transformer T1; the transformer T1 includes the first magnetic ring 11 and a primary coil 15 and a secondary coil 17 wound around the first magnetic ring 11; a bundle of four-strand wires 33 is wound on the first magnetic ring 11. A bundle of four-strand wires 33 includes four enameled wires: the first enameled wire 21, the second enameled wire 29, the third enameled wire 23, and the fourth enameled wire 27; the first enameled wire 21 and the second enameled wire 29 are twisted together to form a first twisted pair 31, the third enameled wire 23 and the fourth enameled wire 27 are twisted together to form a second twisted pair 32, and the first twisted pair 31 and the second twisted pair 32 are twisted together to become a four-strand wire, and then start to pass through the first magnetic ring 11. The wire twisting scheme of first twisting two by two of the four enameled wires into two strands of twisted pairs and then twisting them into one four-strand wire can reduce the leakage inductance and provide a slight distributed capacitance to improve the high-frequency impedance. This four-strand wire can be passed through the ring by machine, that is, made by automatic wire twisting, to improve the automation level of the wire; at the same time, a single-wire design is adopted to reduce the manufacturing difficulty of the wire package and the transformer.
[0037] The second enameled wire 29 and the fourth enameled wire 27 form the secondary coil 17, and the first enameled wire 21 and the third enameled wire 23 form the primary coil 15. A second magnetic ring 12 (a circular magnetic ring) with a central through-hole is provided on the common-mode choke T2.
[0038] The first enameled wire 21 is provided with a first wire end R and a second wire end r';
[0039] The second enameled wire 29 is provided with a first wire end B and a second wire end b';
[0040] The third enameled wire 23 is provided with a first wire end G and a second wire end g';
[0041] The fourth enameled wire 27 is provided with a first wire end N and a second wire end n';
[0042] See the appendix Figure 2 shown, the appendix Figure 2 shows the manufacturing process of a bundle of four-strand wires 33. The wire sequence of wire twisting: the first enameled wire 21 and the second enameled wire 29 are twisted together to form a first twisted pair 31, the third enameled wire 23 and the fourth enameled wire 27 are twisted together to form a second twisted pair 32, and the two twisted pairs are twisted together: the first twisted pair 31 and the second twisted pair 32 are twisted together to become a bundle of four-strand wires 33, and a bundle of four-strand wires 33 is used to make the transformer T1.
[0043] The part of a bundle of four-strand wires 33 wound around the first magnetic ring 11 is twisted together to pass through the central through-hole of the first magnetic ring 11 and then wound on the first magnetic ring 11.
[0044] The first magnetic ring 11 uses a magnetic ring with an outer diameter of 3.5 mm or less, an initial permeability of 3000 or more, and the number of turns of the winding coil is not less than 3 turns and not more than 6 turns;
[0045] One end of a bundle of four-strand wires 33 after winding around the first magnetic ring 11 is the four single-wire first wire heads (R, B, G, N) of the first enameled wire 21, the second enameled wire 29, the third enameled wire 23, and the fourth enameled wire 27, and the other end is the four single-wire second wire heads (r', b', g', n') of the first enameled wire 21, the second enameled wire 29, the third enameled wire 23, and the fourth enameled wire 27.
[0046] The part of the bundle of four-strand wires 33 wound around the first magnetic ring 11 between the four single-wire first wire heads (R, B, G, N) and the four single-wire second wire heads (r', b', g', n') remains in a stranded state. In other words, the bundle of four-strand wires 33 between the four single-wire first wire heads (R, B, G, N) and the four single-wire second wire heads (r', b', g', n') and the first magnetic ring 11 remains in a stranded state. The length L1 of the stranded state retained after the bundle of four-strand wires 33 comes out of the inner hole of the first magnetic ring 11 is 2 mm. The purpose of retaining the 2-mm stranded state is to ensure the symmetry of the primary and secondary magnetic fields and improve high frequency.
[0047] See the appendix Figure 3 as shown, the appendix Figure 3 shows the circuit schematic of this application. The second wire head r' of the first enameled wire 21 and the first wire head G of the third enameled wire 23 together form the first center tap 22. The first center tap 22 is formed by stranding the second wire head r' of the first enameled wire 21 and the first wire head G of the third enameled wire 23 into a bundle. On the primary coil 15 of the transformer T1, there are provided the first wire head R of the first enameled wire 21, the second wire head g' of the third enameled wire 23, and the first center tap 22 (r'G).
[0048] The first wire head B of the second enameled wire 29 and the second wire head n' of the fourth enameled wire 27 together form the second center tap 28; on the secondary coil 17 of the transformer T1, there are provided the first wire head N of the fourth enameled wire 27, the second wire head b' of the second enameled wire 29, and the second center tap 28 (n'B).
[0049] The wire-wound structure of the network port connector of this application includes a transformer T1 and a common-mode choke T2. The distance L2 between the transformer T1 and the common-mode choke T2 is less than 2.5 mm; the common-mode choke T2 winds two or three enameled wires, and the number of turns of the winding on the transformer T1 and the common-mode choke T2 is 3 turns or more.
[0050] Further, in some embodiments, the common mode choke T2 is wound with two enameled wires, which are the second lead b' of the second enameled wire 29 and the first lead N of the fourth enameled wire 27.
[0051] Further, in some embodiments, an additional fifth enameled wire 25 (R1) is added to the common mode choke T2. The fifth enameled wire 25 is provided with a first lead R1 and a second lead R1'. The fifth enameled wire 25, the fourth enameled wire 27, and the second enameled wire 29 are twisted together into a three-strand wire bundle and wound around the second magnetic ring 12. The first lead R1 of the fifth enameled wire 25, the second lead n' of the fourth enameled wire 27, and the first lead B of the second enameled wire 29 form a third center tap 24 (n'BR1); in other words, the first lead R1 of the fifth enameled wire 25 and the second center tap 28 are twisted together to form the third center tap 24.
[0052] Further, in some embodiments, at the other end after a three-strand wire bundle is wound around the second magnetic ring 12 are the second lead R1' of the fifth enameled wire 25, the first lead N of the fourth enameled wire 27, and the second lead b' of the second enameled wire 29, forming three ends on the second magnetic ring 12, which are respectively the second lead R1' of the fifth enameled wire 25, the first lead N of the fourth enameled wire 27, and the second lead b' of the second enameled wire 29.
[0053] Number of twists in the wire bundle: The twist degrees for two-twist, three-twist, and four-twist are all 6 - 34 twists per inch.
[0054] The wire diameters of the first enameled wire 21 (R), the second enameled wire 29 (B), the third enameled wire 23 (G), the fourth enameled wire 27 (N), and the fifth enameled wire 25 (R1) are greater than or equal to 0.1 mm, or AWG38 (American wire gauge standard) and above. Coarse single wires are used: the conductor diameter ≧ 0.1 mm, or AWG38 (American wire gauge) and above, to improve the skin effect to meet applications of 10G and above.
[0055] See the appendix Figure 4 as shown. The appendix Figure 4 shows the parameter settings for winding the transformer T1 and the common mode choke T2. After a four-strand wire bundle 33 comes out of the inner hole of the first magnetic ring 11, the length L1 of the twisted state is retained as 2 mm. The four-strand wire bundle is wound side by side and then four leads are separated; the distance L2 between the transformer T1 and the common mode choke T2 is less than 2.5 mm.
[0056] On the transformer T1, four-strand wires are wound side by side. The length L3 of the un-tinned part of the first center tap 22 (r'G) on the transformer T1 is less than 5 mm. The tinned length of the tap is controlled to improve the high-frequency characteristics. During the winding of the transformer T1, at the alternating position P1 between the inner and outer rings of the first magnetic ring 11: they need to be evenly distributed to avoid crossing and overlapping.
[0057] During the winding of the transformer T1, at the un-twisted wire P2 outside the first magnetic ring 11: the un-twisted length of the multi-strand wire is less than 0.5 mm from the surface of the magnetic ring.
[0058] On the common-mode choke T2, the total length of the third center tap 24 (n'BR1) is less than 6 mm, and the pre-welding length at the wire end of the third center tap 24 at P3 is 1 - 2 mm.
[0059] On the common-mode choke T2, an additional fifth enameled wire 25 (R1) is added. The fourth enameled wire 27, the second enameled wire 29 and the fifth enameled wire 25 are twisted into a bundle of three-strand wires. A bundle of three-strand wires (n'BR1) is wound around the common-mode choke T2 together; a bundle of three-strand wires is wound around the second magnetic ring 12.
[0060] See the appendix Figure 4 As shown, in the appendix Figure 4 The first figure in the appendix shows the winding schematic of the transformer T1. A bundle of four-strand wires 33 is wound on the transformer T1. The four single-wire first wire ends (R, B, G, N) on the incoming wire side of a bundle of four-strand wires 33 are exposed outside the first magnetic ring 11, and the four single-wire second wire ends (r', b', g', n') on the outgoing wire side of a bundle of four-strand wires 33 are exposed outside the first magnetic ring 11.
[0061] In this application, the first enameled wire 21 and the second enameled wire 29 are twisted into the first twisted pair 31 (RB), the third enameled wire 23 and the fourth enameled wire 27 are twisted into the second twisted pair 32 (GN), and then the two twisted pairs are twisted into a bundle of four-strand wires 33. A bundle of four-strand wires 33 is evenly wound on the first magnetic ring 11 of the transformer T1. The number of turns of the coil is 5 turns TS (the number of loops around the wire in a coil). 5 turns TS: that is, the wire in a coil winds 5 loops; 5 turns TS are evenly distributed on 3 / 4 of the first magnetic ring 11 of the transformer T1; the four single-wire first wire ends (R, B, G, N) are in the same phase, and the four single-wire second wire ends (r', b', g', n') are in the same phase.
[0062] When splitting the wires, a bundle of four-strand wires 33 needs to leave a stranded wire with a reserved length L1 of 1 - 2 mm after coming out of the inner hole of the first magnetic ring 11. The purpose of keeping the stranded state of the 1 - 2 mm length L1 is to ensure the symmetry of the primary and secondary magnetic fields and improve the high frequency; after splitting the wires, the second wire end r' of the first enameled wire 21 and the first wire end G of the third enameled wire 23 are twisted to make the first center tap 22 (r'G) of the transformer T1;
[0063] Then, an additional fifth enameled wire 25 (R1) is added and twisted together with the fourth enameled wire 27 and the second enameled wire 29 to form a three-strand wire bundle. The three-strand wire bundle is wound around the second magnetic core 12 of the common-mode choke T2. A third center tap 24 (n'BR1) formed by the three-strand wire bundle on the incoming line side of the common-mode choke T2 is placed. The first center tap 22 of the transformer T1 is placed close to the common-mode choke T2, and the third center tap 24 of the common-mode choke T2 is placed close to the transformer T1;
[0064] The stranded wires should be evenly distributed on the surface and inner hole of the magnetic core to ensure that the stranded wires are flush with the surface of the magnetic core and avoid abnormalities such as crossing, overlapping, and extrusion of the stranded wires;
[0065] One of the three-strand wire bundles (the fourth enameled wire 27, the second enameled wire 29, and the fifth enameled wire 25) is evenly wound around the second magnetic core 12 of the common-mode choke T2, with 5TS turns, and is evenly distributed on the 1 / 2 part of the second magnetic core 12 of the common-mode choke T2;
[0066] The first center tap 22 of the transformer T1 is tinned to a length L3 within 5 mm from the surface of the first magnetic core 11. The third center tap 24 of the common-mode choke T2 is cut short to within 6 mm (at Figure 4 P3 in the attachment), and the tinned length of the head P3 of the third center tap 24 (n'BR1) is 1 - 2 mm;
[0067] The first center tap 22 of the transformer T1 and the third center tap 24 of the common-mode choke T2 are pulled at a 90° angle to achieve tap crossing; this has a great impact on high frequencies, and at the same time, short circuits between the taps of the transformer T1 and the common-mode choke T2 should be avoided;
[0068] The first wire end N of the fourth enameled wire 27 is twisted 180° with the second wire end b' of the second enameled wire 29, and the first wire end R of the first enameled wire 21 is twisted 180° with the second wire end g' of the third enameled wire 23 to reduce the differential impedance.
[0069] The above specific implementation manners include references to the drawings, which form a part of the specific implementation manners. By way of illustration, the drawings show specific embodiments that can implement the present utility model. These embodiments are also referred to as "examples" herein. In addition to the elements shown and described, these examples may also include other elements. The inventors of the present utility model also foresee examples using any combination or arrangement of the shown or described elements, either with respect to a specific example (or one or more aspects thereof) or with respect to other examples (or one or more aspects thereof) shown or described herein.
Claims
1. A transformer, comprising: A first magnetic ring (11), characterized in that a bundle of four twisted wires (33) is wound around the first magnetic ring (11), the bundle of four twisted wires (33) comprising four enameled wires: a first enameled wire (21), a second enameled wire (29), a third enameled wire (23) and a fourth enameled wire (27); The first enameled wire (21) and the second enameled wire (29) are twisted together to form a first twisted pair (31), the third enameled wire (23) and the fourth enameled wire (27) are twisted together to form a second twisted pair (32), and the first twisted pair (31) and the second twisted pair (32) are further twisted together to form the bundle of four twisted wires (33); The second enameled wire (29) and the fourth enameled wire (27) form a secondary coil (17), and the first enameled wire (21) and the third enameled wire (23) form a primary coil (15).
2. A transformer according to claim 1, characterized in that: The diameters of the first enameled wire (21), the second enameled wire (29), the third enameled wire (23), and the fourth enameled wire (27) are greater than or equal to 0.1 mm, or AWG38 or above.
3. A transformer according to claim 2, characterized in that: The first enameled wire (21) is provided with a first wire end (R) and a second wire end (r'); The second enameled wire (29) is provided with a first wire end (B) and a second wire end (b'); The third enameled wire (23) is provided with a first wire end (G) and a second wire end (g'); The fourth enameled wire (27) is provided with a first wire end (N) and a second wire end (n'); After the bundle of four twisted wires (33) is wound around the first magnetic ring (11), one end of the bundle of four twisted wires (33) is four single-wire first wire ends (R, B, G, N) of the first enameled wire (21), the second enameled wire (29), the third enameled wire (23), and the fourth enameled wire (27) on the incoming line side, and the four single-wire first wire ends (R, B, G, N) on the incoming line side are exposed outside the first magnetic ring (11); the other end is four single-wire second wire ends (r', b', g', n') of the first enameled wire (21), the second enameled wire (29), the third enameled wire (23), and the fourth enameled wire (27) on the outgoing line side, and the four single-wire second wire ends (r', b', g', n') on the outgoing line side are exposed outside the first magnetic ring (11); The portion of the bundle of four twisted wires (33) wound around the first magnetic ring (11) between the four single-wire first wire ends (R, B, G, N) and the four single-wire second wire ends (r', b', g', n') remains in a twisted state, and the length L1 of the bundle of four twisted wires (33) remaining in the twisted state after coming out of the inner hole of the first magnetic ring (11) is 2 mm.
4. A transformer according to claim 2, characterized in that: The first magnetic ring (11) is a magnetic ring with an outer diameter of 3.5 mm or less, an initial magnetic permeability of 3000 or more, and a winding number of not less than 3 turns and not more than 6 turns.
5. A transformer according to claim 2, characterized in that: The twisting degrees of the first twisted pair (31), the second twisted pair (32), and the bundle of four twisted wires (33) are all 6 to 34 knots / inch.
6. A transformer according to claim 3, characterized in that: The second wire end (r') of the first enameled wire (21) and the first wire end (G) of the third enameled wire (23) together form a first center tap (22); The first wire end (B) of the second enameled wire (29) and the second wire end (n') of the fourth enameled wire (27) together form a second center tap (28).
7. A wire package structure of a network port connector, characterized in that: The invention comprises a transformer T1 as claimed in any one of claims 1 to 6, and a common-mode choke T2, wherein a distance L2 between the transformer T1 and the common-mode choke T2 is less than 2.5 mm; the common-mode choke T2 comprises a second magnetic ring (12), the second magnetic ring (12) is wound with two or three enameled wires, and the number of coils wound on the first magnetic ring (11) and the second magnetic ring (12) is 3 or more.
8. The wire package structure of the network port connector according to claim 7, characterized in that: The second magnetic ring (12) is wound around two enameled wires, the two enameled wires being the second enameled wire (29) and the fourth enameled wire (27).
9. The wire package structure of the network port connector according to claim 7, characterized in that: The second magnetic ring (12) is wound with three enameled wires, an additional fifth enameled wire (25) is added to the second magnetic ring (12), the fifth enameled wire (25) is provided with a first wire end (R1) and a second wire end (R1'), and the fifth enameled wire (25), the fourth enameled wire (27), and the second enameled wire (29) are twisted into a bundle of three twisted wires; One end of a bundle of three twisted wires wound behind the second magnetic ring (12) is the second wire end (R1') of the fifth enameled wire (25), the first wire end (N) of the fourth enameled wire (27), and the second wire end (b') of the second enameled wire (29); The first wire end (R1) of the fifth enameled wire (25), the second wire end (n') of the fourth enameled wire (27), and the first wire end (B) of the second enameled wire (29) form a third center tap (24).
10. The wire package structure of the network port connector according to claim 9, characterized in that: The untinned length L3 of the first center tap (22) is less than 5 mm, the total length of the third center tap (24) is less than 6 mm, and the pre-welding length P3 at the wire end of the third center tap (24) is 1-2 mm.