A multifunctional Ethernet transformer coil with anti-reverse transmission function

Abstract

The present invention discloses a multifunctional Ethernet transformer coil with anti-reverse transmission function, comprising a first enameled wire, a second enameled wire, a third enameled wire, a fourth enameled wire, a fifth enameled wire, a sixth enameled wire, a first manganese-zinc ferrite core, a nickel-zinc ferrite core, and a second manganese-zinc ferrite core. The first, second, third, and fourth enameled wires are twisted together to form a first winding; the first winding is wound around the first manganese-zinc ferrite core to form an isolation coil; the leading end of the third enameled wire and the trailing end of the fourth enameled wire are twisted together to form a second winding; the second winding is wound around the nickel-zinc ferrite core to form a common-mode coil; the fifth and sixth enameled wires are twisted together to form a third winding; and the third winding is wound around the second manganese-zinc ferrite core to form an anti-reverse coil. The present invention can meet the requirements of high-speed and high-reliability transmission and has good environmental adaptability, making it particularly suitable for harsh environments such as military and aerospace applications.

Description

Technical Field

[0001] The present invention relates to an Ethernet transformer coil, in particular to a multifunctional and highly reliable Ethernet transformer coil with an anti-reverse transmission function, belonging to the technical field of Ethernet communication. Background Art

[0002] With the rapid development of current communication technology, more and more electronic devices are being integrated into various products. However, the operating voltages and device impedances of various electronic devices vary. When exchanging information, direct electrical connections can cause problems such as overcurrent damage, impedance mismatch, clutter interference, and mutual influence due to different operating voltages.

[0003] Existing Ethernet transformer coils do not have an anti-reverse transmission function, cannot suppress the reverse transmission of downstream signals, and cannot protect the signal source. Therefore, existing Ethernet transformer coils can only achieve the basic function of signal transmission and cannot guarantee the quality of signal transmission.

[0004] As the frequency and volume of information exchange between electronic devices continue to increase, increasingly stringent requirements are placed on information exchange equipment: fast transmission, stable and reliable transmission, and the ability to cope with various interference signals, avoid overcurrent damage, prevent reverse transmission, and protect the source. Therefore, there is an urgent need to design an Ethernet transformer coil that provides high-reliability transmission and reverse interference protection. This design can improve line reliability and be applied to 100M / 1G / 10G Ethernet networks. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a multifunctional Ethernet transformer coil with anti-reverse transmission function. This solves the technical problems of traditional transformer coils being prone to reverse transmission of downstream signals and poor signal transmission quality when used in the Ethernet field. The present invention can meet the requirements of high-speed and high-reliability transmission, has good environmental adaptability, and is particularly suitable for harsh environments such as military or aerospace.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] A multifunctional high-reliability Ethernet transformer coil with anti-reverse transmission function includes: a first color enameled wire, a second color enameled wire, a third color enameled wire, a fourth color enameled wire, a fifth color enameled wire, a sixth color enameled wire, a first manganese-zinc ferrite core, a nickel-zinc ferrite core, a second manganese-zinc ferrite core, and high-temperature solder; the first to fourth color enameled wires are twisted into a twisted wire to form a first winding, the twisted portion of which is wound on the first manganese-zinc ferrite core to form an isolation coil; the first end of the third color enameled wire and the tail end of the fourth color enameled wire are twisted into a twisted wire to form a second winding, the twisted portion of which is wound on the nickel-zinc ferrite core to form a common-mode coil; the fifth color enameled wire and the sixth color enameled wire are twisted into a twisted wire to form a second winding, the twisted portion of which is wound on the nickel-zinc ferrite core to form a common-mode coil The wires are twisted into a twisted wire to form a third winding, and the twisted part is wound on the second manganese-zinc ferrite core to form an anti-reverse coil; the common-mode coil is connected in series after the isolation coil and is wound integrally with it; the anti-reverse coil is located after the isolation coil and the common-mode coil, and is connected in parallel with the common-mode coil; through the above design, it is ensured that the coil has the functions of differential signal transmission, DC isolation, common-mode suppression, signal reverse transmission suppression, impedance matching, etc., and can be applied to the fields of 100M / 1G / 10G Ethernet; at the same time, through precise parameter design and control, it is ensured that the coil has good electrical performance and distributed parameters, can meet the requirements of high-speed and high-reliability transmission, has good environmental adaptability, and is particularly suitable for harsh environments such as military or aerospace.

[0008] The present invention provides a multifunctional Ethernet transformer coil with anti-reverse transmission function, comprising a first enameled wire, a second enameled wire, a third enameled wire, a fourth enameled wire, a fifth enameled wire, a sixth enameled wire, a first manganese-zinc ferrite core, a nickel-zinc ferrite core, and a second manganese-zinc ferrite core;

[0009] The first enameled wire, the second enameled wire, the third enameled wire, and the fourth enameled wire are twisted together to form a first winding; the first winding is wound on a first manganese-zinc ferrite core to form an isolated coil; in the first winding, the tail end of the first enameled wire and the head end of the second enameled wire are twisted together to form a primary center tap, the primary center tap, the head end of the first enameled wire, and the tail end of the second enameled wire together constitute a primary lead wire, the tail end of the third enameled wire and the head end of the fourth enameled wire are twisted together to form a secondary center tap, and the head end of the third enameled wire and the tail end of the fourth enameled wire are twisted together to form a second winding;

[0010] The second winding is wound on the nickel-zinc ferrite core to form a common mode coil;

[0011] The fifth enameled wire and the sixth enameled wire are twisted together to form a third winding; the third winding is wound on the second manganese-zinc ferrite core to form an anti-reverse coil; in the third winding, the tail end of the fifth enameled wire and the head end of the sixth enameled wire are twisted together to form a secondary center tap; the head end of the fifth enameled wire in the third winding and the tail end of the third enameled wire in the second winding are twisted together to form the first secondary lead wire, and the tail end of the sixth enameled wire in the third winding and the tail end of the fourth enameled wire in the second winding are twisted together to form the second secondary lead wire; the secondary center tap, the first secondary lead wire and the second secondary lead wire together constitute the secondary lead wire.

[0012] Furthermore, the isolation coil is connected in series after the signal source, and is used to perform differential signal transmission, DC isolation or impedance matching on the signal input by the signal source;

[0013] The common mode coil is connected in series after the isolation coil to suppress the common mode signal of the signal input by the isolation coil;

[0014] The anti-reverse coil is connected in parallel with the common-mode coil to suppress the reverse input signal of the downstream.

[0015] Furthermore, the stranding density of the first winding is 5 to 7 mm / section;

[0016] The twist density of the second and third windings is 3 to 4 mm per section.

[0017] Furthermore, the first winding, the second winding, and the third winding are wound in a single layer close to the magnetic core and are evenly distributed in 360°.

[0018] Furthermore, the first winding, the second winding and the third winding include twisted segments and untwisted segments located on both sides of the twisted segments, wherein the twisted segments are wound on the magnetic core.

[0019] Furthermore, the method for determining the number of turns of the first winding, the second winding, and the third winding includes:

[0020] Determine the minimum number of turns N based on the required coil inductance L:

[0021] Among them, A L is the single-turn inductance;

[0022] Take the minimum value N of the number of turns as the initial value and increase the number of turns until the coil has the optimal distribution parameters. Among them, L s is the leakage inductance, C s is the distributed capacitance.

[0023] Further, When the value of is the smallest, the coil has the optimal distribution parameters.

[0024] Furthermore, the first manganese-zinc ferrite core, the nickel-zinc ferrite core, and the second manganese-zinc ferrite core are coated with C-type parylene.

[0025] Furthermore, the first enameled wire, the second enameled wire, the third enameled wire, the fourth enameled wire, the fifth enameled wire and the sixth enameled wire are polyurethane enameled wires.

[0026] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0027] (1) The present invention utilizes magnetic damping technology and designs anti-reverse coils to prevent the downstream signal from affecting the source chip. It also utilizes magnetic coupling isolation technology to improve the reliability of signal transmission by designing isolation coils and common-mode coils. The aforementioned coils are organically combined to complement each other and achieve multifunctional, highly reliable transmission.

[0028] (2) The common mode coil and the isolation coil of the present invention are integrally wound and formed, and the two can be directly connected by winding, without having to be wound separately and then welded together. This prevents connection errors and unreliable connection fractures, greatly improving electrical reliability.

[0029] (3) The present invention accurately designs and strictly controls parameters such as the number of winding turns and the twist density (pitch) of the twisted wire; and ensures that the coil has the best electrical performance and the optimal distribution parameters through control measures such as winding the wire close to the magnetic core, single-layer winding, and 360° uniform winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural diagram of the Ethernet transformer coil in an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of a first winding in an embodiment of the present invention;

[0032] Figure 3 This is a third winding schematic diagram in an embodiment of the present invention;

[0033] In the picture, 1-gold enameled wire, 2-blue enameled wire, 3-red enameled wire, 4-green enameled wire, 5-purple enameled wire, 6-white enameled wire, 7-first manganese-zinc ferrite core, 8-nickel-zinc ferrite core, 9-second manganese-zinc ferrite core, 10-high-temperature solder, 1234-first winding, 34-second winding, 56-third winding. DETAILED DESCRIPTION

[0034] The following detailed description of the present invention will make the features and advantages of the present invention more clear and explicit.

[0035] The word "exemplary" is used exclusively herein to mean "serving as an example, example, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0036] To ensure high-quality signal transmission, it is necessary to consider the comprehensive influence of multiple physical parameters of the coil. It is not a simple optimization of a single factor. Due to the constraints between the factors, sometimes it is impossible to achieve the optimization of all single factors. The only way is to achieve the optimal combination after taking multiple factors into consideration. The factors that need to be considered include: the volume of the core, the single-turn inductance A L ; Whether the enameled wire is twisted, twist density, coating; number of winding coils, winding distribution, tightness and other physical quantities.

[0037] Based on the above considerations, the present invention provides a multifunctional high-reliability Ethernet transformer coil with anti-reverse transmission function, which uses magnetic coupling technology to physically isolate circuits between devices to avoid circuit damage due to overcurrent, and at the same time uses magnetic field coupling to transmit AC signals; transforms the voltage through turns ratio design to adapt the voltage and impedance on both sides of the link; uses common-mode coils to filter stray common-mode signals to avoid interference from noise; uses anti-reverse coil design to avoid reverse transmission of downstream signals and protect the signal source; the ingeniously designed multifunctional high-reliability Ethernet transformer coil with anti-reverse transmission function can effectively solve various problems caused by the above-mentioned direct connection, such as overcurrent damage, impedance mismatch, noise interference, and reverse transmission of downstream signals; and plays an important role in ensuring signal transmission, signal filtering, and system protection of the chip.

[0038] The present invention provides a multifunctional high-reliability Ethernet transformer coil with anti-reverse transmission function, specifically comprising: a first enameled wire, a second enameled wire, a third enameled wire, a fourth enameled wire, a fifth enameled wire, a sixth enameled wire, a first manganese-zinc ferrite core, a nickel-zinc ferrite core, and a second manganese-zinc ferrite core; in a specific embodiment, it further comprises high-temperature solder;

[0039] The first to fourth enameled wires are twisted together into a twisted wire to form a first winding; the twisted part of the first winding is wound on the first manganese-zinc ferrite core; the tail end of the first enameled wire and the head end of the second enameled wire are twisted to form a primary center tap, which is combined with the head end of the first enameled wire and the tail end of the second enameled wire to form a primary lead-out wire to form an isolation coil, completing primary-secondary signal transmission, impedance conversion, DC isolation and other functions; the tail end of the third enameled wire and the head end of the fourth enameled wire are twisted to form a secondary center tap; the head end of the third enameled wire and the tail end of the fourth enameled wire are twisted into a twisted wire to form a second winding; the twisted part of the second winding is wound on the nickel-zinc ferrite core to form a common mode coil, completing common mode signal suppression Function: the fifth enameled wire and the sixth enameled wire are twisted into a twisted wire to form a third winding; the twisted part of the third winding is wound on the second manganese-zinc ferrite core; the tail end of the fifth enameled wire and the head end of the sixth enameled wire are twisted into a secondary center tap to form an anti-reverse coil, which realizes the reverse differential signal suppression function, isolates the reverse signal, prevents the reverse signal from being transmitted back, damages the source chip, and protects the source chip; the head end of the fifth enameled wire is twisted with the tail end of the third enameled wire in the second winding to form the first secondary lead-out wire; the tail end of the sixth enameled wire is twisted with the tail end of the fourth enameled wire in the second winding to form the second secondary lead-out wire; together with the secondary center tap, they form the secondary lead-out wire. The "head end" and "tail end" mentioned here are the names of the windings in which the enameled wires are located. For example, the tail end of the fourth enameled wire in the first winding is the portion of the fourth enameled wire in one end of the first winding after it is wound on the first manganese-zinc ferrite core. The tail end of the fourth enameled wire in the second winding is the portion of the fourth enameled wire in one end of the second winding after it is wound on the nickel-zinc ferrite core.

[0040] The coil assembly of the present invention is a multifunctional coil assembly, consisting of three coils with different functions; among them, the isolation coil performs differential signal transmission, DC isolation, and impedance matching functions, and is connected in series after the signal source in the physical link; the common-mode coil performs common-mode signal suppression, is connected in series after the isolation coil, and is wound integrally with the isolation coil; the anti-reverse coil performs signal reverse transmission suppression, is located after the isolation coil and the common-mode coil, and is connected in parallel with the common-mode coil; the three coils are organically combined together through a clever series-parallel connection method, with complementary functions, to jointly achieve multifunctional and highly reliable transmission.

[0041] In a specific embodiment, the first to sixth enameled wires are enameled wires of different colors, and four-color wires are used in the first winding to facilitate primary and secondary grouping and twisting of the center tap.

[0042] In one specific embodiment, the primary and secondary windings are wound in parallel, with the first to fourth enameled wires twisted together into a twisted cable with a twist density of 5-7 mm / section. The secondary winding is wound in parallel, with the third and fourth enameled wires twisted together into a twisted cable with a twist density of 3-4 mm / section. The anti-reverse coil is wound in parallel, with the fifth and sixth enameled wires twisted into a twisted cable with a twist density of 3-4 mm / section. Controlling the twist density ensures appropriate distributed capacitance and low leakage inductance.

[0043] In a specific embodiment, the first winding twisted portion is wound on the first manganese-zinc ferrite core; the second winding twisted portion is wound on the nickel-zinc ferrite core; and the third winding twisted portion is wound on the second manganese-zinc ferrite core.

[0044] Capacitance and leakage inductance are the result of multiple factors. Distributed capacitance is affected by the number of turns, wire spacing, coating medium, and twist density. Leakage inductance is affected by the number of turns and twist density. In a specific embodiment, the first winding twisted portion is wound on the first manganese zinc ferrite core, and the primary and secondary four wires are wound in parallel. According to the inductance calculation formula L = A L N 2 (Where L is the coil inductance, A L is the single-turn inductance, N is the number of winding turns), the number of winding turns can be determined optimally, the twisted wire is close to the magnetic core, single-layer winding, and 360° uniform distribution; the primary and secondary are wound in parallel to ensure a stable and reliable turns ratio, and there is no risk of inconsistent turns due to separate winding, which affects the transformation ratio and impedance matching; by controlling the number of winding turns, it is ensured that it has the corresponding electrical properties, such as inductance, etc.; close to the magnetic core, single-layer winding, and uniform distribution ensure that the coil has the optimal distribution parameters (L S is the leakage inductance, C S is the distributed capacitance).

[0045] In a specific embodiment, the first magnetic core and the third magnetic core are made of manganese-zinc ferrite, and the second magnetic core is made of nickel-zinc ferrite core, all of which are coated with C-type parylene to enhance high-temperature resistance and can operate stably for a long time at 130°C; the first enameled wire, the second enameled wire, the third enameled wire, the fourth enameled wire, the fifth enameled wire and the sixth enameled wire are made of polyurethane enameled wire, and the center tap can be directly removed by soldering to ensure its electrical conductivity, which is simple and convenient and enhances its manufacturing process performance.

[0046] The coil assembly of the present invention is a multifunctional coil assembly, which is composed of three coils with different functions. Through ingenious design, the three coils are organically combined in series and parallel, with complementary functions, to achieve multifunctional and highly reliable transmission.

[0047] Among them, the isolation coil completes the functions of differential signal transmission, DC isolation, and impedance matching. In the physical link, it is connected in series after the signal source; the common-mode coil completes common-mode signal suppression, is connected in series after the isolation coil, and is wound integrally with the isolation coil; the anti-reverse coil has the function of suppressing signal reverse transmission. It is located after the isolation coil and the common-mode coil, and is connected in parallel with the common-mode coil to isolate the reverse signal and prevent the reverse signal from being transmitted back and damaging the source chip, protecting the source chip and having an anti-reverse transmission function design;

[0048] The primary and secondary isolation coils are wound in parallel, ensuring a stable and reliable turns ratio. Separate windings will not result in inconsistent turns, which could affect the transformation ratio and impedance matching. Furthermore, the four-wire parallel winding method has two benefits: first, it can double the number of turns by winding one turn, reducing the number of turns; and second, it forms a center tap for grounding, enabling differential signal transmission.

[0049] The common mode coil and the isolation coil are integrally wound and can be directly connected by winding, without having to separate them and then weld them together. This prevents connection errors and unreliable connection fractures, greatly improving electrical reliability.

[0050] According to the analysis and reasoning, the formula of distributed capacitance between primary and secondary of toroidal transformer coil is obtained. (Where: C s represents distributed capacitance, ε0 represents the vacuum dielectric constant; ε r represents the dielectric constant of the medium filling the primary and secondary; k represents the electrostatic force constant; d represents the distance between the primary and secondary; Ss and Sp represent the surface area of ​​the secondary winding and the surface area of ​​the primary winding, respectively. This allows for precise design and strict control of parameters such as the core size, number of turns, and twist density (pitch). By implementing control measures such as close winding to the core, single-layer winding, and 360° uniform winding, the coil is guaranteed to have optimal electrical performance and the most optimal distribution parameters. Example:

[0051] like Figure 1 This embodiment provides a multifunctional, high-reliability Ethernet transformer coil with anti-reverse transmission function, which is implemented as follows: a first enameled wire, a second enameled wire, a third enameled wire, a fourth enameled wire, a fifth enameled wire, a sixth enameled wire, a first manganese-zinc ferrite core 7, a nickel-zinc ferrite core 8, a second manganese-zinc ferrite core 9, and high-temperature solder 10; wherein: the first enameled wire, the second enameled wire, the third enameled wire, the fourth enameled wire, the fifth enameled wire, and the sixth enameled wire are respectively a gold enameled wire 1, a blue enameled wire 2, a red enameled wire 3, a green enameled wire 4, a purple enameled wire 5, and a white enameled wire 6.

[0052] The first manganese-zinc ferrite core 7 and the second manganese-zinc ferrite core 9 are both 3.43mm×1.78mm×2.06mm in size, both made of manganese-zinc material, and have a single-turn inductance of not less than 1.0uH; the nickel-zinc ferrite core 8 is 3.04mm×1.6mm×1.7mm in size, made of nickel-zinc material, and has a single-turn inductance of not less than 0.18uH;

[0053] like Figure 2 , one each of gold enameled wire 1, blue enameled wire 2, red enameled wire 3, and green enameled wire 4, all 400 mm in length and 0.11 mm in diameter, all coated with polyurethane, the four wires are twisted from the middle to both sides, with a twist length of 85 mm and a twist density of 5 to 7 mm / section, forming the first winding 1234;

[0054] The first winding 1234 is wound around the first manganese-zinc ferrite core 7 in a twisted shape. According to the inductance calculation formula L=A L N 2 , it can be preferably determined to wind 14 turns, close to the core, single-layer winding, 360° uniform distribution; a total of gold, blue, red, green (relative to the beginning of the first winding), and gold b ,blue b ,red b ,green b (Relative to the end of the first winding) Eight lead wires, gold b The lead wire and the blue lead wire are twisted to form the primary center tap gold b Blue, with gold lead wire, blue b The lead wires together serve as primary lead wires;

[0055] First winding 1234 red b The lead wire and the green lead wire are twisted together to form the center tap red b Green, red lead and green b The two lead wires are twisted together in a clockwise direction, with a twist length of 70 mm and a twist density of 3 to 4 mm / section to form a second winding 34;

[0056] The second winding 34 is wound around the nickel-zinc ferrite core 8 in a twisted shape. The two wires are wound in parallel. According to the inductance calculation formula L=A L N 2 , it is preferred to determine 13 turns of winding, close to the core, single layer winding, 360° uniform distribution, forming a red c Lead wire, green c Lead wire (relative to the tail end of the second winding);

[0057] like Figure 3, one purple enameled wire 5 and one white enameled wire 6, both 200 mm long, are twisted from the middle to both sides, with a twist length of 70 mm and a twist density of 3 to 4 mm / section to form a third winding 56;

[0058] The third winding 56 is wound around the second manganese zinc ferrite 9 in a twisted shape, and the two wires are wound in parallel. According to the inductance calculation formula L=A L N 2 , it is preferred to determine the winding 14 turns, close to the core, single layer winding, 360 ° uniform distribution, forming purple, white (relative to the beginning of the third winding) and purple b ,white b (relative to the tail end of the third winding) four lead wires;

[0059] The third winding 56 purple b The lead wire and the white lead wire are twisted to form the secondary center tap purple b The white and purple lead wires and the red lead wire in the second winding c Lead wire, twisted connection to form the first lead wire in the secondary c Purple, third winding 56 white b The lead wire and the green wire in the second winding c The lead wires are twisted to form another green wire in the secondary c white b Lead wire; red c Purple lead wire, green c white b Lead wire, purple b White lead wire, red b The green lead wire serves as the secondary of the entire coil assembly.

[0060] The length of each end is cut into 40 mm, and 5 mm of the enameled wire coating is removed with high-temperature solder 10 to expose the enameled wire copper core.

[0061] The present invention has been described in detail above with reference to specific embodiments and exemplary examples. However, these descriptions should not be construed as limiting the present invention. Those skilled in the art will appreciate that various equivalent substitutions, modifications, or improvements may be made to the technical solutions and implementations of the present invention without departing from the spirit and scope of the present invention, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be determined by the appended claims.

[0062] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A multifunctional Ethernet transformer coil with anti-reverse transmission function, characterized in that: It includes a first enameled wire, a second enameled wire, a third enameled wire, a fourth enameled wire, a fifth enameled wire, a sixth enameled wire, a first manganese-zinc ferrite core, a nickel-zinc ferrite core, and a second manganese-zinc ferrite core; The first enameled wire, the second enameled wire, the third enameled wire and the fourth enameled wire are twisted to form a first winding; The first winding is wound on the first manganese-zinc ferrite core to form an isolated coil; in the first winding, the tail end of the first enameled wire and the head end of the second enameled wire are twisted together to form a primary center tap, the primary center tap, the head end of the first enameled wire, and the tail end of the second enameled wire together constitute a primary lead wire, the tail end of the third enameled wire and the head end of the fourth enameled wire are twisted together to form a secondary center tap, and the head end of the third enameled wire and the tail end of the fourth enameled wire are twisted together to form a second winding; The second winding is wound on the nickel-zinc ferrite core to form a common mode coil; The fifth enameled wire and the sixth enameled wire are twisted together to form a third winding; the third winding is wound on the second manganese-zinc ferrite core to form an anti-reverse coil; in the third winding, the tail end of the fifth enameled wire and the head end of the sixth enameled wire are twisted together to form a secondary center tap; the head end of the fifth enameled wire in the third winding and the tail end of the third enameled wire in the second winding are twisted together to form a first secondary lead wire, and the tail end of the sixth enameled wire in the third winding and the tail end of the fourth enameled wire in the second winding are twisted together to form a second secondary lead wire; the secondary center tap, the first secondary lead wire, and the second secondary lead wire together constitute a secondary lead wire; The isolation coil is connected in series after the signal source and is used to perform differential signal transmission, DC isolation or impedance matching on the signal input by the signal source; The common mode coil is connected in series after the isolation coil to suppress the common mode signal of the signal input by the isolation coil; The anti-reverse coil is connected in parallel with the common-mode coil to suppress the reverse input signal of the downstream.

2. The multifunctional Ethernet transformer coil with anti-reverse transmission function according to claim 1, characterized in that: The stranding density of the first winding is 5-7 mm / section; The twist density of the second and third windings is 3 to 4 mm per section.

3. The multifunctional Ethernet transformer coil with anti-reverse transmission function according to claim 1, characterized in that: The first winding, the second winding and the third winding are wound in a single layer close to the magnetic core and are evenly distributed in 360 degrees.

4. The multifunctional Ethernet transformer coil with anti-reverse transmission function according to claim 1, characterized in that: The first winding, the second winding and the third winding include twisted segments formed by twisting and untwisted segments located on both sides of the twisted segments, wherein the twisted segments are wound on the magnetic core.

5. The multifunctional Ethernet transformer coil with anti-reverse transmission function according to claim 1, characterized in that: The method for determining the number of turns of the first winding, the second winding, and the third winding includes: Determine the minimum number of turns N based on the required coil inductance L: Among them, A L is the single-turn inductance; Take the minimum value N of the number of turns as the initial value and increase the number of turns until the coil has the optimal distribution parameters. Among them, L s is the leakage inductance, C s is the distributed capacitance.

6. The multifunctional Ethernet transformer coil with anti-reverse transmission function according to claim 1, characterized in that: When the value of is the smallest, the coil has the optimal distribution parameters.

7. The multifunctional Ethernet transformer coil with anti-reverse transmission function according to claim 1, characterized in that: The first manganese-zinc ferrite core, the nickel-zinc ferrite core, and the second manganese-zinc ferrite core are coated with C-type parylene.

8. The multifunctional Ethernet transformer coil with anti-reverse transmission function according to claim 1, characterized in that: The first enameled wire, the second enameled wire, the third enameled wire, the fourth enameled wire, the fifth enameled wire and the sixth enameled wire are polyurethane enameled wires.

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