A high-speed network transformer coil set and network transformer

Abstract

This invention provides a high-speed network transformer coil assembly and a network transformer, relating to the field of transformer communication technology. It solves one of the problems of traditional network transformer coils: low transmission rate, high parasitic capacitance and leakage inductance, low differential signal consistency, and poor suppression of high-speed EMI, crosstalk, and radiated interference. The coil assembly includes an isolation coil and a common-mode coil. The isolation coil includes an isolation core and a first wire bundle, while the common-mode coil includes a common-mode core and a second wire bundle. The first wire bundle is wound on the isolation core and includes first to fourth groups of enameled wires with different markings, each group including an even number of enameled wires with the same markings. The second wire bundle is wound on the common-mode core and includes first to third enameled wires with different markings. This invention features low leakage inductance, low signal energy loss, low attenuation of high-frequency signals, low insertion loss, and better guarantees the amplitude and phase stability of high-frequency signals while achieving a high transmission rate.

Description

Technical Field

[0001] This invention relates to the field of transformer communication technology, specifically to a high-speed network transformer coil assembly and a network transformer. Background Technology

[0002] With the rapid development of information technology, the fast and highly reliable transmission of massive amounts of data has become a necessity. Ethernet communication protocols, with their core advantages such as good compatibility, high reliability, and high transmission rates, are now widely used in various industries. As Ethernet transmission rates continue to increase, the corresponding PHY chips and network transformers also need to be upgraded.

[0003] Traditional network transformer coils are low-speed coils. Although they also employ the process of winding primary and secondary isolation coils in parallel, they generally use a four-wire parallel winding scheme, that is, two enameled wires as the primary of the isolation coil and two enameled wires as the secondary of the isolation coil. After this winding process is adapted to the corresponding magnetic core, it can only meet the maximum transmission rate of 1Gbps and the signal transmission frequency of 100MHz.

[0004] However, with the increase in Ethernet transmission rate to 10Gbps, the frequency has also increased to 500MHz or even higher. This requires transformer coil windings to meet higher high-frequency bandwidth, lower high-frequency insertion loss, lower differential signal delay difference, and extremely low leakage inductance and parasitic capacitance. At the same time, high-speed network transformer coils are required to suppress high-speed EMI, crosstalk, and radiated interference. Traditional four-wire parallel-wound low-speed network transformer coils are difficult to meet the requirements.

[0005] Therefore, there is an urgent need for a new type of network transformer coil group that can meet the requirements of high-speed and high-frequency transmission. Summary of the Invention

[0006] Based on the above analysis, the present invention aims to provide a high-speed network transformer coil group and a network transformer to solve one of the problems of traditional network transformer coils, such as low transmission rate, high parasitic capacitance and leakage inductance, low consistency of differential signals, and poor ability to suppress high-speed EMI, crosstalk, and radiated interference.

[0007] One embodiment of the present invention provides a high-speed network transformer coil group, including: an isolation coil and a common-mode coil; the isolation coil includes an isolation magnetic core and a first wire harness, and the common-mode coil includes a common-mode magnetic core and a second wire harness; The first wire bundle is wound on the isolation magnetic core, and the first wire bundle includes a first to a fourth group of enameled wires with different markings, each group of enameled wires including an even number of enameled wires with the same markings; the second wire bundle is wound on the common mode magnetic core, and the second wire bundle includes a first to a third enameled wire with different markings. The first wire bundle is wound clockwise in half of the circumferential region of the isolation magnetic core; the second wire bundle is wound counterclockwise in one circumferential region of the common-mode magnetic core.

[0008] Further, the first group of enameled wires includes: a first enameled wire and a second enameled wire with a first identifier; the second group of enameled wires includes: a third enameled wire and a fourth enameled wire with a second identifier; the third group of enameled wires includes: a fifth enameled wire and a sixth enameled wire with a third identifier; and the fourth group of enameled wires includes: a seventh enameled wire and an eighth enameled wire with a fourth identifier.

[0009] Furthermore, the first enameled wire of the second wire harness is the ninth enameled wire with the fifth identifier; the second enameled wire of the second wire harness is the tenth enameled wire with the sixth identifier; and the third enameled wire of the second wire harness is the eleventh enameled wire with the seventh identifier.

[0010] Furthermore, the first and fifth identifiers are gold, the second and sixth identifiers are blue, the third and seventh identifiers are red, and the fourth identifier is green.

[0011] Furthermore, the beginning of the seventh enameled wire is twisted together with the end of the fifth enameled wire to form a first twisted end; the beginning of the eighth enameled wire is twisted together with the end of the sixth enameled wire to form a second twisted end; the first twisted end and the second twisted end are welded together to form a primary common end.

[0012] Furthermore, the beginning of the third enameled wire is twisted together with the beginning of the fourth enameled wire to form a third twisted end; the end of the first enameled wire is twisted together with the end of the second enameled wire to form a fourth twisted end; the third twisted end, the fourth twisted end, and the beginning of the eleventh enameled wire are twisted together and welded to form a secondary common end.

[0013] Furthermore, the beginning ends of the first enameled wire and the beginning ends of the second enameled wire are twisted together and then twisted and welded to the beginning end of the ninth enameled wire to form the first stage beginning end.

[0014] Furthermore, the ends of the third and fourth enameled wires are twisted together and then twisted and welded to the beginning of the tenth enameled wire to form a second-stage beginning.

[0015] Furthermore, the portion of the first wire bundle wound on the isolation magnetic core is a twisted section, with the enameled wire wound on the isolation magnetic core twisted into a braid shape. The two ends of the first wire bundle are led out from the isolation magnetic core, and the ends of the wire bundle not wound on the isolation magnetic core are no longer twisted and are separated into single strands.

[0016] Another embodiment of the present invention provides a network transformer, including the aforementioned high-speed network transformer coil group.

[0017] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: (1) The present invention adopts an eight-wire parallel winding scheme, namely four primary coils and four secondary coils. Each type of coil uses an even number of enameled wires, that is, the primary and secondary windings of the isolation coil are both double-wire parallel windings. Thus, the number of turns, wire length and winding position can be completely consistent, so that the DC resistance, inductance, leakage inductance and distributed capacitance of the two secondary differential wires are highly matched, which ensures the symmetry of the differential signal from the physical structure and improves the common-mode rejection capability. When the two wires are parallel wound, the two wires are arranged close together, the magnetic coupling degree is high, the coupling coefficient is greatly improved, and the corresponding leakage inductance is significantly reduced. The smaller the leakage inductance, the less signal energy loss, the smaller the attenuation of high frequency signal, the lower the insertion loss, and the better the amplitude and phase stability of high frequency signal and the high transmission rate.

[0018] (2) The present invention arranges the isolation coil winding within the semicircular range of the isolation core, which can significantly reduce the distributed capacitance, effectively reduce the high-frequency capacitive bypass loss, suppress signal crosstalk and improve the high-frequency isolation performance, and optimize the high-frequency insertion loss index; at the same time, the structure design of the winding asymmetric covering the core can gather the differential mode magnetic field and disperse the common mode stray magnetic field, thereby effectively suppressing common mode noise and reducing the overall electromagnetic radiation interference of the equipment.

[0019] (3) The portion of the first wire harness wound on the isolation magnetic core in this invention is a stranded section. By fixing the stranded section with polyimide tape, the position of the first wire harness on the isolation magnetic core is fixed and will not become messy or shift.

[0020] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from the description and drawings, which are particularly pointed out. Attached Figure Description

[0021] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. Figure 1 This is one of the structural schematic diagrams of the high-speed network transformer coil group in Embodiment 1 of the present invention; Figure 2 This is the second schematic diagram of the structure of the high-speed network transformer coil group in Embodiment 1 of the present invention; Figure 3This is the third schematic diagram of the high-speed network transformer coil group structure in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the isolation coil and common mode coil covering layer structure in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the isolation coil harness in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the common-mode coil harness in Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the high-speed network transformer coil group in Embodiment 1 of the present invention.

[0022] Figure label: 1-Isolation coil; 101-Isolation core; 102-First wire bundle; a-First enameled wire; a'-Start of the first enameled wire; a”-End of the first enameled wire; b-Second enameled wire; b'-Start of the second enameled wire; b”-End of the second enameled wire; c-Third enameled wire; c'-Start of the third enameled wire; c”-End of the third enameled wire; d-Fourth enameled wire; d'-Start of the fourth enameled wire; d”-End of the fourth enameled wire; e-Fifth enameled wire; e'-Start of the fifth enameled wire; e”-End of the fifth enameled wire; f-Sixth enameled wire; f'-Start of the sixth enameled wire; f”-End of the sixth enameled wire; g-Seventh enameled wire; g'-Start of the seventh enameled wire; g”-End of the seventh enameled wire; h-Eighth enameled wire; h'-Start of the eighth enameled wire; h”-End of the eighth enameled wire; 2-Common mode coil; 201-Common mode magnetic core; 202-Second wire harness; i-Ninth enameled wire; i'-Start of the ninth enameled wire; i”-End of the ninth enameled wire; j-Tenth enameled wire; j'-Start of the tenth enameled wire; j”-End of the tenth enameled wire; k-Eleventh enameled wire; k'-Start of the eleventh enameled wire; k”-End of the eleventh enameled wire; 3-Primary common terminal; 4-Secondary common terminal; 5-First stage starting terminal; 6-Second stage starting terminal; 7-High viscosity silicone; 8-Low viscosity silicone; 9-Copper foil; 10-PTFE film. Detailed Implementation

[0023] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0024] Example 1: To address one of the technical problems of traditional network transformer coils—low transmission rate, high parasitic capacitance and leakage inductance, and low consistency of differential signals—such as... Figure 1 and Figure 2As shown, a specific embodiment of the present invention provides a high-speed network transformer coil assembly, including: an isolation coil 1 and a common-mode coil 2; the isolation coil 1 includes an isolation magnetic core 101 and a first wire harness 102, and the common-mode coil 2 includes a common-mode magnetic core 201 and a second wire harness 202; wherein, the first wire harness 102 is wound on the isolation magnetic core 101, and the first wire harness 102 includes a first to a fourth group of enameled wires with different markings, each group of enameled wires including an even number of wires (two in this embodiment) with the same markings; the second wire harness 202 is wound on the common-mode magnetic core 201, and the second wire harness 202 includes a first to a third enameled wire with different markings.

[0025] Furthermore, to address the issue of deterioration in the high-frequency signal integrity of traditional network transformer coils, resulting in significant electromagnetic interference, the isolation coil 1 employs an asymmetrical winding design covering the isolation core 101. Specifically, the first wire bundle 102 is wound clockwise in half of the isolation core 101 (i.e., within a circumferential 180° range); the second wire bundle 202 is wound counterclockwise in one circumferential region of the common-mode core 201 (i.e., within a circumferential 360° range), with the side of the isolation core 101 unwound by the first wire bundle 102 facing the common-mode coil 2, and the starting and ending ends of the second wire bundle 202 of the common-mode coil 2 facing the unwound side of the isolation coil 1. This asymmetrical winding design of the isolation coil 1 covering the isolation core 101 effectively concentrates the differential-mode magnetic field and disperses the common-mode stray magnetic field, thereby suppressing common-mode noise and reducing overall electromagnetic interference. Furthermore, the first wire harness 102 of this invention is wound within the semicircular area of ​​the isolation core 101, which reduces the facing area between the enameled wires, decreases parasitic capacitance, reduces crosstalk, and improves high-frequency isolation, especially at speeds of 1~10Gbps, resulting in better insertion loss. At the same time, winding the coil within the semicircular area of ​​the isolation core 101 frees up space on one side, facilitating the subsequent twisting and soldering of the interconnecting wires of the isolation coil 1 and the common-mode coil 2.

[0026] Furthermore, to address the issue of securing the first wire harness 102 wound on the isolation core 101, the portion of the first wire harness 102 wound on the isolation core 101 is a twisted section. The enameled wire wound on the isolation core 101 is twisted into a braid shape, and both ends of the first wire harness 102 are led out from the isolation core 101. The ends of the wire harness not wound on the isolation core 101 are no longer twisted and remain separate as single strands. The twisted section is secured with polyimide tape, which ensures that the first wire harness 102 is fixed in position on the isolation core 101, preventing it from becoming messy or shifting.

[0027] Among them, such as Figure 5 and Figure 6As shown, the first group of enameled wires in the first wire harness 102 includes: a first enameled wire a and a second enameled wire b, both with a first identifier; the second group of enameled wires in the first wire harness 102 includes: a third enameled wire c and a fourth enameled wire d, both with a second identifier; the third group of enameled wires in the first wire harness 102 includes: a fifth enameled wire e and a sixth enameled wire f, both with a third identifier; the fourth group of enameled wires in the first wire harness 102 includes: a seventh enameled wire g and an eighth enameled wire h, both with a fourth identifier; the first enameled wire in the second wire harness 202 is a ninth enameled wire i, with a fifth identifier; the second enameled wire in the second wire harness 202 is a tenth enameled wire j, with a sixth identifier; and the third enameled wire in the second wire harness 202 is an eleventh enameled wire k, with a seventh identifier.

[0028] It should be noted that in this embodiment, the different markings are distinguished by different colors. The first and fifth markings are gold, the second and sixth markings are blue, the third and seventh markings are red, and the fourth marking is green. The different markings are only used to distinguish different enameled wires.

[0029] Among them, the beginning g' of the seventh enameled wire is twisted together with the end e” of the fifth enameled wire to form the first twisted end; the beginning h' of the eighth enameled wire is twisted together with the end f” of the sixth enameled wire to form the second twisted end; the first twisted end and the second twisted end are welded together to form the primary common end 3.

[0030] Among them, the beginning end c' of the third enameled wire and the beginning end d' of the fourth enameled wire are twisted together to form the third twisted end; the end a” of the first enameled wire and the end b” of the second enameled wire are twisted together to form the fourth twisted end; the third twisted end, the fourth twisted end and the beginning end k' of the eleventh enameled wire are twisted together and welded to form the secondary common end 4.

[0031] Among them, the beginning a' of the first enameled wire and the beginning b' of the second enameled wire are twisted together and then twisted together with the beginning i' of the ninth enameled wire and welded to form the first-stage beginning 5; the end c” of the third enameled wire and the end d” of the fourth enameled wire are twisted together and then twisted together with the beginning j' of the tenth enameled wire and welded to form the second-stage beginning 6.

[0032] Among them, the beginning e' of the fifth enameled wire and the beginning f' of the sixth enameled wire are twisted together to form the first free end; the end g” of the seventh enameled wire and the end h” of the eighth enameled wire are twisted together to form the second free end; the end i” of the ninth enameled wire forms the third free end; the end j” of the tenth enameled wire forms the fourth free end; and the end k” of the eleventh enameled wire forms the fifth free end.

[0033] Furthermore, to address the issues of insulation withstand voltage and mechanical environmental resistance of the coil assembly, the solder joints of the primary common terminal 3, secondary common terminal 4, primary starting terminal 5, and secondary starting terminal 6 are wrapped with high-viscosity silicone 7. The high-viscosity silicone 7 has a viscosity between 100,000 and 150,000 cP, a temperature resistance range greater than -55℃ to 245℃, cures at room temperature, and possesses excellent insulation withstand voltage and mechanical environmental resistance properties.

[0034] Furthermore, in order to address the issue that coil groups cannot simultaneously meet the requirements of high and low temperature characteristics, electromagnetic radiation interference characteristics, and excellent insulation withstand voltage characteristics, such as... Figure 3 and Figure 4 As shown, the isolation coil 1 and the common-mode coil 2 are each wrapped with low-viscosity silicone 8; one or more layers of copper foil 9 are wrapped around the low-viscosity silicone 8; and at least two layers of polytetrafluoroethylene film 10 are wrapped around the copper foil 9; wherein the copper foil 9 is connected to the primary common terminal 3 or the secondary common terminal 4. The coil assembly, through the "sandwich" protection process of wrapping low-viscosity silicone 8, copper foil 9 and polytetrafluoroethylene film 10 from the inside out, can simultaneously meet the high and low temperature characteristics, electromagnetic radiation interference characteristics and excellent insulation withstand voltage characteristics of the coil assembly.

[0035] The primary coil of isolation coil 1 uses a four-wire parallel winding system with red (e) and green (g) and green (h) wires, and a common terminal. This achieves a two-wire parallel winding, and the 0.11mm diameter four-wire parallel winding reduces space compared to the conventional 0.15mm diameter two-wire parallel winding. It also reduces the DC resistance of the primary coil, lowers the skin effect, reduces losses, and improves temperature resistance. Simultaneously, the 0.11mm diameter enameled wire has better flexibility, allowing for a tighter fit to the magnetic core and improving electromagnetic conversion efficiency. The secondary coil of the isolation coil uses a four-wire parallel winding system with gold (a) and blue (b) wires, and a common terminal. The secondary coil uses the same four-wire parallel winding structure as the primary coil, with the eight enameled wires tightly twisted together. This minimizes overall leakage inductance and ensures uniformity, significantly improving coil coupling efficiency to over 0.98, a significant improvement over the maximum coupling efficiency of 0.85 for single-wire winding.

[0036] Furthermore, both the isolation core 101 and the common mode core 201 are made of nickel-zinc ferrite toroidal cores, with the isolation core having a size of 3mm (outer diameter). 1.3mm (inner diameter) 1.3mm (height), single-turn inductance 1.50-1.60uH, common-mode core size 3mm (outer diameter) 1.6mm (inner diameter) 1.6mm (height), single-turn inductance 0.15-0.18uH; enameled wire diameter is 0.11mm.

[0037] like Figure 7 As shown, the principle of a network transformer coil assembly suitable for high-speed transmission is as follows: The first free end formed by twisting the beginning e' of the fifth enameled wire and the beginning f' of the sixth enameled wire is connected to the signal of TD1+; the second free end formed by twisting the end g” of the seventh enameled wire and the end h” of the eighth enameled wire is connected to the signal of TD1-; the primary common terminal 3 is connected to the signal of TCT1; the first stage beginning terminal 5 is connected to the signal of MX1+; the second stage beginning terminal 6 is connected to the signal of MX1-; and the secondary common terminal is connected to the signal of MCT1.

[0038] Wherein, TD is the primary winding (i.e., the input terminal) of the coil group, and MX is the secondary winding (i.e., the output terminal) of the coil group; TD1+ is the positive terminal of the differential signal data at the input terminal of the transformer coil group generated by the PHY chip; TD1- is the negative terminal of the differential signal data at the input terminal of the transformer coil group generated by the PHY chip; TCT1 is the center tap of the primary coil; MX1+ is the positive terminal of the differential signal data at the output terminal of the transformer coil group; MX1- is the negative terminal of the differential signal data at the output terminal of the transformer coil group; and MCT1 is the center tap of the secondary coil.

[0039] The high-speed AC differential pulse signal emitted by the PHY chip flows into the primary coil of isolation coil 1 through TD1+ and TD1-. An alternating magnetic field is generated through the magnetic core. The alternating magnetic field passes through the magnetic core and induces a differential AC voltage of the same frequency and waveform on the secondary coil of isolation coil 1. Since DC signals cannot induce a magnetic field, isolation coil 1 can only transmit AC signals and isolate DC signals.

[0040] It should be noted that the Ethernet transmission link involved in this invention is: CPU-PHY chip-network transformer-RJ45 network port-network cable. Therefore, the PHY chip (Physical Layer) is the core physical layer chip on the Ethernet transmission link.

[0041] The AC signal flowing from the secondary winding of isolation coil 1 is transmitted on common-mode coil 2. Since the enameled wires on common-mode coil 2 are wound in the same direction and with the same number of turns, the differential-mode signal generated by the PHY chip has equal and opposite currents in the tenth enameled wire j (marked sixth, blue) and the eleventh enameled wire k (marked seventh, red). This causes the magnetic fields generated by the tenth and eleventh enameled wires j and k to cancel each other out, achieving lossless transmission of the differential-mode signal. The common-mode signal currents in the tenth enameled wire j (marked sixth, blue) and the eleventh enameled wire k (marked seventh, red) are in the same direction, and the magnetic fields generated on the core are superimposed in the same direction, producing a large inductive reactance that blocks and suppresses the common-mode signal.

[0042] It should be noted that the common-mode signal on the two wires, the tenth enameled wire j with the sixth mark (i.e., blue) and the eleventh enameled wire k with the seventh mark (i.e., red), refers to the common-mode signal coupled by external devices (such as motors, switching power supplies, and radio frequency equipment) around the coil group on the two wires, the tenth enameled wire j with the sixth mark (i.e., blue) and the eleventh enameled wire k with the seventh mark (i.e., red).

[0043] TCT1 is the center tap of the primary coil. TCT1 is connected to the core power supply or midpoint potential of the PHY chip (physical layer transceiver chip) through a resistor or capacitor, providing a DC static operating point for the differential pair, ensuring that the PHY input and output levels operate in the linear range without clipping or distortion. Common-mode interference on the differential lines will form a low-impedance discharge path to ground or power supply through the center tap. Combined with the magnetic coupling characteristics of the transformer, this significantly suppresses EMI (electromagnetic interference) and radiated interference. The center tap divides the primary coil into two equal halves, making the positive and negative differential magnetic circuits symmetrical, reducing differential signal distortion and crosstalk, and improving signal integrity.

[0044] MCT1 is the center tap of the secondary coil. Each MCT1 channel is connected to the chassis ground through a 75Ω resistor and a 1000pF capacitor to achieve differential impedance matching and common-mode termination matching, reducing signal reflection and return loss, and enabling long-distance network cable transmission. MCT1 discharges interference from lightning strikes, surges, static electricity, and secondary common-mode high voltage through the chassis ground. The secondary coil is evenly distributed to improve adjacent channel crosstalk and near-end crosstalk.

[0045] It should be noted that the center tap of the primary coil refers to the lead wire wound in the middle of the primary coil of the transformer, i.e. Figure 2 The primary common terminal 3; the center tap of the secondary coil refers to the lead wire wound in the middle of the transformer's secondary coil, i.e. Figure 2 The secondary public terminal 4 in the middle.

[0046] Example 2: Another specific embodiment of the present invention provides a network transformer, including the high-speed network transformer coil group in embodiment 1.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-speed network transformer coil group, characterized in that, include: An isolation coil (1) and a common-mode coil (2); the isolation coil (1) includes an isolation core (101) and a first wire harness (102), and the common-mode coil (2) includes a common-mode core (201) and a second wire harness (202); The first wire bundle (102) is wound on the isolation magnetic core (101), and the first wire bundle (102) includes a first to a fourth group of enameled wires with different markings, each group of enameled wires including an even number of enameled wires with the same markings; the second wire bundle (202) is wound on the common mode magnetic core (201), and the second wire bundle (202) includes a first to a third enameled wire with different markings; The first wire harness (102) is wound clockwise in half of the circumferential region of the isolation magnetic core (101); the second wire harness (202) is wound counterclockwise in one circumferential region of the common mode magnetic core (201); The isolation coil (1) and the common mode coil (2) are respectively wrapped with low-viscosity silicone (8); one or more layers of copper foil (9) are wrapped around the low-viscosity silicone (8); at least two layers of polytetrafluoroethylene film (10) are wrapped around the copper foil (9); wherein the copper foil (9) is connected to the primary common terminal (3) or the secondary common terminal (4).

2. The high-speed network transformer coil group according to claim 1, characterized in that, The first group of enameled wires includes: a first enameled wire and a second enameled wire having a first identifier; The second group of enameled wires includes: a third enameled wire and a fourth enameled wire having a second identifier; The third group of enameled wires includes: a fifth enameled wire and a sixth enameled wire with a third identifier; The fourth group of enameled wires includes: the seventh enameled wire and the eighth enameled wire, which are marked with the fourth designation.

3. The high-speed network transformer coil group according to claim 2, characterized in that, The first enameled wire is the ninth enameled wire with the fifth mark; The second enameled wire is the tenth enameled wire with the sixth mark; The third enameled wire is the eleventh enameled wire with the seventh mark.

4. The high-speed network transformer coil group according to claim 3, characterized in that, The first and fifth identifiers are gold, the second and sixth identifiers are blue, the third and seventh identifiers are red, and the fourth identifier is green.

5. The high-speed network transformer coil group according to claim 3, characterized in that, The beginning of the seventh enameled wire is twisted together with the end of the fifth enameled wire to form a first twisted end; The beginning of the eighth enameled wire is twisted together with the end of the sixth enameled wire to form a second twisted end; The first twisted end and the second twisted end are welded together to form a primary common end (3).

6. The high-speed network transformer coil group according to claim 5, characterized in that, The beginning of the third enameled wire is twisted together with the beginning of the fourth enameled wire to form a third twisted end; The end of the first enameled wire is twisted together with the end of the second enameled wire to form a fourth twisted end; The third twisted end, the fourth twisted end, and the beginning end of the eleventh enameled wire are twisted together and welded to form a secondary common end (4).

7. The high-speed network transformer coil group according to claim 3, characterized in that, The beginning ends of the first enameled wire and the beginning ends of the second enameled wire are twisted together and then twisted together with the beginning end of the ninth enameled wire and welded to form the first stage beginning end (5).

8. The high-speed network transformer coil group according to claim 3, characterized in that, The ends of the third and fourth enameled wires are twisted together and then twisted and welded to the beginning of the tenth enameled wire to form the second-stage beginning (6).

9. The high-speed network transformer coil group according to claim 3, characterized in that, The portion of the first wire bundle (102) wound on the isolation magnetic core (101) is a twisted section. The enameled wire wound on the isolation magnetic core (101) is twisted into a braid shape. The two ends of the first wire bundle (102) are led out from the isolation magnetic core (101). The ends of the wire bundle that are not wound on the isolation magnetic core (101) are no longer twisted and are separated into single strands.

10. A network transformer, characterized in that, Includes the high-speed network transformer coil assembly as described in any one of claims 1 to 9.

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