CN103426587A - Magnetic Coils, Magnetic Connection Modules, and Network Connectors - Google Patents

Abstract

The invention relates to a magnetic coil, a magnetic connection module and a network connector. The magnetic coil includes: a first magnetic core; a second magnetic core; a primary coil, comprising: the first enameled wire comprises a first winding wound on the first magnetic core, and a first wire end and a second wire end which are positioned at two ends of the first winding; the second enameled wire comprises a second winding wound on the first magnetic core, and a third wire end and a fourth wire end which are positioned at two ends of the second winding; the second wire head is electrically connected with the third wire head; a secondary coil, comprising: the third enameled wire comprises a third winding wound on the first magnetic core, and a fifth wire end and a sixth wire end which are positioned at two ends of the third winding; the fourth enameled wire comprises a fourth winding wound on the first magnetic core, and a seventh wire end and an eighth wire end which are positioned at two ends of the fourth winding; the fifth wire end, the sixth wire end, the seventh wire end and the eighth wire end are further wound on the second magnetic core, and the sixth wire end is electrically connected with the seventh wire end.

Description

Magnetic Coils, Magnetic Connection Modules, and Network Connectors

technical field

The present invention relates to the field of electronic technology, more specifically, to a magnetic coil, a magnetic connection module and a network connector.

Background technique

With the rapid development of communication technology, network connectors have been widely used in computers, servers and network equipment to connect Ethernet transceiver chips and terminal equipment interfaces together, thereby achieving signal coupling between the two, Galvanic isolation and noise suppression functions.

Different from traditional network connectors, network connectors integrated with magnetic connection modules have the advantages of less space, strong anti-interference ability, and high integration, so they have become mainstream products in the industry. The magnetic connection module of the network connector at least includes a magnetic coil composed of an isolation transformer (Xfmr) and a common mode inductor (CMC, or called a common mode choke coil). In particular, since the three-channel common-mode inductor can be effectively compatible with current-driven and voltage-driven physical layer (PHY) chips, it is widely used in the design of magnetic coils in existing magnetic modules.

A conventional magnetic coil 10 is shown in FIGS. 1 a and 1 b. Wherein, FIG. 1 a is a schematic diagram of the coil structure of the magnetic coil 10 , and FIG. 1 b is a schematic diagram of the circuit of the magnetic coil 10 . As shown in FIGS. 1 a and 1 b , the magnetic coil 10 is composed of an isolation transformer 11 and a common mode coil 12 . The isolation transformer 11 includes four strands of enameled wires wound on the first magnetic core 13 (wire ends are R/G/N/B respectively, and wire ends are r/g/n/b respectively). Two strands in the four-strand enameled wire (the wire heads are N/B respectively, and the wire tails are respectively n/b) constitute the primary wire package of the isolation transformer 11, wherein the wire head N and the wire tail b are used as signal lines for receiving signals, and the wire ends B is electrically connected to line tail n. The other two strands of the four strands of enameled wire (the wire ends are R/G and the wire tails are respectively r/g) constitute the secondary wire package of the isolation transformer 11, wherein the wire head R and the wire tail g are also wound on the second magnetic core 14 to form two inductance coils in the common mode coil 12 . In addition, the wire head G and the wire tail r are also wound on the second magnetic core 14 through an additional enameled wire (wire head N', wire tail n') to form another inductance coil in the common mode coil 12, wherein, The wire head G/N' is twisted with the wire tail r to form a three-wire tap, and the paint is stripped to realize electrical connection.

It can be seen that due to the addition of extra enameled wires (wire head N', wire tail n'), the magnetic coil 10 requires a corresponding paint stripping operation to connect the enameled wire, which increases the manufacturing cost and processing hours of the magnetic coil 10. In addition, the position of the three-wire tap G/r/N' cannot be fixed usually, and it is easy to touch with the coil taps of other channels in the network connector, resulting in a short circuit, which will affect the reliability of the magnetic coil 10 .

Contents of the invention

Based on the above analysis, it is desirable to provide a magnetic coil with low manufacturing cost and high reliability.

In order to solve the above problems, according to one aspect of the present invention, a magnetic coil is provided, including: a first magnetic core; a second magnetic core; a primary wire package, which includes: a first enameled wire, which includes a wound A first winding on the first magnetic core, and a first wire end and a second wire end located at both ends of the first winding; a second enameled wire, which includes a first winding wound on the first magnetic core Two windings, and a third wire end and a fourth wire end located at both ends of the second winding; wherein, the second wire end is electrically connected to the third wire end; a secondary wire package, which includes: a third enameled wire, It includes a third winding wound on the first magnetic core, a fifth wire end and a sixth wire end located at both ends of the third winding; a fourth enameled wire, which includes winding on the first magnetic core The fourth winding of the fourth winding and the seventh and eighth thread ends located at both ends of the fourth winding; wherein, the fifth thread end, the sixth thread end, the seventh thread end and the eighth thread end are also wound on on the second magnetic core, and the sixth wire stub is electrically connected to the seventh wire stub.

It can be seen that in the above magnetic coils, the four ends of the two enameled wires in the secondary wire wrap of the isolation transformer can be directly wound on the second magnetic core and used as the inductance coil in the common mode inductor, which eliminates the need for additional enameled wires To form an inductance coil, which effectively reduces the manufacturing cost of the magnetic coil. In addition, since the three-wire tap does not need to be formed in the magnetic coil, this also avoids reliability problems caused by the three-wire tap.

In one embodiment, the first winding has the same number of coils as the second winding, and the third winding has the same number of coils as the fourth winding. In this embodiment, the two signal input/output channels of the isolation transformer are symmetrical to each other, thereby forming a common-mode circuit for better noise suppression.

In one embodiment, the number of coils wound on the second magnetic core by the fifth wire end, the sixth wire end, the seventh wire end and the eighth wire end are the same. This can simplify the manufacturing process of the magnetic coil and reduce the manufacturing cost. For example, these wire ends are bundled into a bundle and wound together on the second magnetic core.

In one embodiment, the ends of the fifth wire end, the sixth wire end, the seventh wire end and the eighth wire end are all located on the same side of the second magnetic core. In this embodiment, the ends of these wire stubs being on the same side facilitate lead wires, thereby allowing easy assembly of the magnetic coil.

In one embodiment, the sixth wire end is electrically connected to the seventh wire end by spot welding or paint stripping and dipping.

In one embodiment, the primary wire package further includes: a fifth enameled wire, which is wound on the first magnetic core in the same winding manner as the first enameled wire, and the fifth enameled wire The two wire ends are respectively electrically connected to the two wire ends of the first enameled wire; and a sixth enameled wire is wound on the first magnetic core in the same winding manner as the second enameled wire, and the The two wire ends of the sixth enameled wire are respectively electrically connected with the two wire ends of the second enameled wire. In this embodiment, the added fifth enameled wire and sixth enameled wire can be used to adjust the input impedance of the isolation transformer, so that the output impedance of the isolation transformer and the equipment coupled to it are matched with each other.

In one embodiment, the secondary wire package further includes: a seventh enameled wire wound on the first magnetic core and the second magnetic core in the same winding manner as the third enameled wire , and the two ends of the seventh enameled wire are electrically connected to the two ends of the third enameled wire respectively; and an eighth enameled wire, which is wound on the first enameled wire in the same winding manner A magnetic core is connected to the second magnetic core; and the two wire ends of the eighth enameled wire are respectively electrically connected to the two wire ends of the fourth enameled wire. In this embodiment, the added enameled wire can be used to adjust the output impedance of the magnetic coil.

According to another aspect of the present invention, there is also provided a magnetic connection module, including the magnetic coil described in any one of the preceding aspects, and a printed circuit board, which has a plurality of solder pads, and the wire ends of the magnetic coil and electrically connected to the plurality of pads respectively.

According to yet another aspect of the present invention, there is also provided a network connector, which includes the magnetic connection module described in the preceding aspect, and: a spring pin terminal; a terminal base with a connecting terminal, wherein the spring pin The terminal and the terminal base are respectively assembled on the printed circuit board, and are electrically connected to the magnetic coil through the printed circuit board; a housing is provided with a bracket, and the bracket is used to fix and assemble the magnetic coil. The spring pin terminal is connected to the magnetic connection module of the terminal base.

The above and other characteristics of the present invention will be clearly illustrated in the Examples section hereinafter.

Description of drawings

The above and other features of the present invention will be more apparent through the following detailed description of the embodiments shown in conjunction with the drawings, and the same or similar symbols in the drawings of the present invention represent the same or similar components.

Figures 1a and 1b show a conventional magnetic coil 10;

2a and 2b show a magnetic coil 200 according to an embodiment of the present invention;

3a and 3b show a magnetic coil 300 according to an embodiment of the present invention;

Figures 4a and 4b illustrate a magnetic coil 400 according to an embodiment of the present invention;

FIG. 5 shows a magnetic connection module 500 according to an embodiment of the present invention;

FIG. 6 shows a magnetic connection module 600 according to one embodiment of the present invention;

7a and 7b illustrate a network connector 700 according to an embodiment of the present invention.

Detailed ways

In the following detailed description of the preferred embodiment, reference is made to the accompanying drawings which form a part hereof. The accompanying drawings show, by way of example, specific embodiments in which the invention can be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments in accordance with the invention. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. Accordingly, the following detailed description is not limiting, and the scope of the invention is defined by the appended claims.

Figures 2a and 2b illustrate a magnetic coil 200 according to one embodiment of the present invention. Wherein, FIG. 2 a is a schematic diagram of the coil structure of the magnetic coil 200 ; FIG. 2 b is a schematic circuit diagram of the magnetic coil 200 . In practical applications, the magnetic coil 200 can be used in a network connector to implement functions such as signal coupling, electrical isolation, and noise suppression between connected devices.

As shown in Figure 2a, the magnetic coil 200 includes:

the first magnetic core 201;

the second magnetic core 203;

The primary wire package 205 includes: a first enameled wire 207, which includes a first winding wound on the first magnetic core 201, and a first wire end 207a and a second wire end 207b located at both ends of the first winding; and a second enameled wire 209, which includes a second winding wound on the first magnetic core 201, and a third wire end 209a and a fourth wire end 209b located at both ends of the second winding; wherein, the second wire end 207b is electrically connected to the third wire end 209a;

The secondary wire package 211 includes: a third enameled wire 213, which includes a third winding wound on the first magnetic core 201 and a fifth wire end 213a and a sixth wire end 213b located at both ends of the third winding; and a fourth enameled wire 215 , which includes the fourth winding wound on the first magnetic core 201 and the seventh wire end 215a and the eighth wire end 215b located at both ends of the fourth winding; wherein, the fifth wire end 213a, the sixth wire end 213b, the seventh wire end 215a and The eighth wire end 215b is also wound on the second magnetic core 203, and the sixth wire end 213b is electrically connected to the seventh wire end 215a. Wherein, the electrical connection between the sixth wire end 213b and the seventh wire end 215a means that the two wire ends are electrically connected by the part extending from the part wound around the second magnetic core 203 .

Specifically, the first magnetic core 201 and the second magnetic core 203 may be circular, cylindrical or other structures suitable for winding enameled wires. Wherein, the first magnetic core 201 can be made of, for example, manganese-zinc material, and the second magnetic core 203 can be made of, for example, nickel-zinc material or manganese-zinc material. It should be noted that, in this article, the wire head refers to the part extending from the winding part of the enameled wire wound on the magnetic core, that is, the end of the enameled wire and the part between the end and the winding.

As shown in FIG. 2b, each winding of the first enameled wire 207, the second enameled wire 209, the third enameled wire 213 and the fourth enameled wire 215 wound on the first magnetic core 201 constitutes the primary coil and the secondary coil of the isolation transformer 221, The ratio of the number of primary coils to the secondary coils determines the transformation ratio of the isolation transformer 221 .

In the circuit shown in Figure 2b, the first wire end 207a of the first enameled wire 207 and the fourth wire end 209b of the second enameled wire 209 are used to receive signals respectively, that is, two signal wires as the isolation transformer 221, and mutually electrically The connected second wire stub 207b and third wire stub 209a can be used as a reference potential wire of the two signal wires.

On the other hand, the four ends of the third enameled wire 213 and the fourth enameled wire 215 wound on the second magnetic core 203 constitute four inductance coils in the common mode coil 223 respectively. Wherein, the inductance coil formed by the sixth wire end 213b and the seventh wire end 215a electrically connected at the ends is substantially connected in parallel with each other, thus being equivalent to an inductance. The equivalent inductance, together with the inductance coil formed by the fifth wire end 213 a and the eighth wire end 215 b together form a three-channel common mode inductance. Similar to the first wire end 207a and the fourth wire end 209b, the fifth wire end 213a of the third enameled wire 213 and the eighth wire end 215b of the fourth enameled wire 215 are used to output signals processed by the magnetic coil 200, and are electrically connected to each other The sixth wire head 213b and the seventh wire head 215a can serve as reference potential wires of the two signal wires.

In some embodiments, the first winding has the same number of coils as the second winding, and the third winding has the same number of coils as the fourth winding. This makes two signal input/output channels of the isolation transformer 221, that is, a signal input/output channel formed by the first wire head 207a and the fifth wire head 213a and another signal input/output channel formed by the fourth wire head 209b and the eighth wire head 215b. The output channels are symmetrical to each other to form a common-mode circuit for noise rejection. In a preferred embodiment, the number of coils of the first winding, the second winding, the third winding and the fourth winding are all the same, that is, the transformation ratio of the isolation transformer 221 is 1:1.

In some embodiments, the number of coils wound on the second magnetic core 203 by the fifth wire end 213 a , the sixth wire end 213 b , the seventh wire end 215 a and the eighth wire end 215 b is the same. For example, the four wire ends can be twisted or bundled into one bundle, and wound together on the second magnetic core 203 . This can simplify the manufacturing process of the magnetic coil 200 and reduce the manufacturing cost. In addition, in the coil structure of the magnetic coil 200 shown in FIG. 2a, the ends of the fifth wire end 213a, the sixth wire end 213b, the seventh wire end 215a and the eighth wire end 215b are all located on the same side of the second magnetic core 203, that is, Located on the side of the second magnetic core 203 away from the first magnetic core 201 . In practical applications, since the magnetic coil 200 is usually installed on, for example, a printed circuit board, the ends of these wire ends located on the same side are good for lead wires, so that the magnetic coil 200 is easy to assemble. For example, the first wire head 207a, the fourth wire head 209b, the fifth wire head 213a and the eighth wire head 215b as signal lines can all be welded to the pads of the printed circuit board by spot welding, or welded to the circuit board by spot welding. on the terminal in order to access the circuit. In addition, the second wire head 207b and the third wire head 209a, or the sixth wire head 213b and the seventh wire head 215a can also be respectively spot-welded to the pad or terminal, or connected together (such as spot welding or connected by conductive adhesive) on pads or terminals. It can be seen that in this magnetic coil 200, there is no need to form the three-wire taps in the magnetic coil 10 shown in FIG. The reliability problem caused by the free movement of the three-wire tap.

It can be seen that in the magnetic coil 200, the four ends of the two enameled wires 213 and 215 of the secondary wire package 211 of the isolation transformer 221 can be directly wound on the second magnetic core 203, and used as the inductance coil in the common mode inductor, This eliminates the need for additional enameled wires to form the inductance coil, which effectively reduces the manufacturing cost of the magnetic coil 200 .

Figures 3a and 3b illustrate a magnetic coil 300 according to one embodiment of the present invention. Wherein, FIG. 3 a is a schematic coil structure diagram of the magnetic coil 300 ; FIG. 3 b is a schematic circuit diagram of the magnetic coil 300 .

As shown in FIG. 3 a and FIG. 3 b , the magnetic coil 300 includes a first magnetic core 301 , a second magnetic core 303 , a primary wire package 305 and a secondary wire package 311 . In addition to the two strands of enameled wires included in the primary wire package 205 shown in FIGS. The sixth enameled wire 319.

Wherein, the fifth enameled wire 317 is wound on the first magnetic core 301 in the same winding manner as the first enameled wire 307 , and the two ends of the fifth enameled wire 317 are electrically connected to the two ends of the first enameled wire 307 . The sixth enameled wire 319 is wound on the first magnetic core 301 in the same winding manner as the second enameled wire 309 , and the two ends of the sixth enameled wire 319 are electrically connected to the two ends of the second enameled wire 309 . Wherein, the same winding method mentioned here means that the number of coils of the two enameled wires wound on the magnetic core is the same, for example, the two enameled wires can be twisted or bundled into one bundle and wound together on the magnetic core.

The fifth enameled wire 317 and the sixth enameled wire 319 added in the primary wire package 305 can be used to adjust the input impedance of the primary wire package 305 so as to match the output impedance of the primary wire package 305 and the device to which it is coupled. In addition, since the two enameled wires can be wound in the same way as the other two enameled wires of the primary wire package 305 , the manufacturing process complexity of the entire magnetic coil 300 is not increased.

Figures 4a and 4b illustrate a magnetic coil 400 according to one embodiment of the present invention. Wherein, FIG. 4 a is a schematic diagram of the coil structure of the magnetic coil 400 ; FIG. 4 b is a schematic circuit diagram of the magnetic coil 400 .

As shown in FIG. 4 a and FIG. 4 b , the magnetic coil 400 includes a first magnetic core 401 , a second magnetic core 403 , a primary wire package 405 and a secondary wire package 411 . Among them, the primary wire package 405 includes the first enameled wire 407, the second enameled wire 409, the fifth enameled wire 417 and the sixth enameled wire 419; and the secondary wire package 411 includes the third enameled wire 413, the fourth enameled wire 415, the seventh enameled wire 421 and the 423 eight enameled wires.

Wherein, the fifth enameled wire 417 is wound on the first magnetic core 401 in the same winding manner as the first enameled wire 407 , and the two ends of the fifth enameled wire 417 are electrically connected to the two ends of the first enameled wire 407 . The sixth enameled wire 419 is wound on the first magnetic core 401 in the same winding manner as the second enameled wire 409 , and the two ends of the sixth enameled wire 419 are electrically connected to the two ends of the second enameled wire 409 .

In addition, the seventh enameled wire 421 is wound on the first magnetic core 401 and the second magnetic core 403 in the same winding manner as the third enameled wire 413 , and the two ends of the seventh enameled wire 421 and the two ends of the third enameled wire 413 The wire ends are electrically connected respectively. The eighth enameled wire 423 is wound on the first magnetic core 401 and the second magnetic core 403 in the same winding manner as the fourth enameled wire 415, and the two wire ends of the eighth enameled wire 423 and the two wire ends of the fourth enameled wire 415 are respectively electrical connection.

It should be noted that the second magnetic core 403 in FIG. 4 a has two holes, and the enameled wire can pass through one and/or both of these holes to be wound on the second magnetic core 403 . In some other embodiments, the second magnetic core 403 may only have one hole for winding the enameled wire, or adopt other structures suitable for winding the enameled wire.

Compared with the magnetic coil 200 shown in FIG. 2a and FIG. 2b, the enameled wire added in the primary wire package 405 and the secondary wire package 411 can be used to adjust the input impedance and output impedance of the magnetic coil 400, so that the magnetic coil 400 can Match the impedance of the device to which it is coupled. In addition, since the four enameled wires can be wound in the same winding manner as the other four enameled wires, their introduction does not increase the complexity of the manufacturing process of the entire magnetic coil 400 .

It should be noted that, in practical applications, similar to the magnetic coil 300 shown in FIG. 3a and the magnetic coil 400 shown in FIG. There may be, for example, 2 strands, 4 strands or more enameled wires, respectively.

FIG. 5 shows a magnetic connection module 500 according to one embodiment of the present invention.

As shown in Figure 5, the magnetic connection module 500 includes a magnetic coil 501, which is, for example, the coil structure shown in the magnetic coil 200 shown in Figure 2a, the magnetic coil 300 shown in Figure 3a or the magnetic coil 400 shown in Figure 4a . In addition, the magnetic connection module 500 further includes a printed circuit board 503, on which there are a plurality of pads 505, and wire ends 507 of the magnetic coil 501 are electrically connected to these pads 505, respectively. In some examples, the wire ends 507 of the magnetic coil 501 may be spot welded to the pads 505 .

It can be seen that since the ends of the enameled wires in the magnetic coil 501 can be soldered to the pads 505 , the positions of these ends are fixed, thus avoiding the risk of the ends touching each other and causing a short circuit. In some examples, the magnetic connection module 500 may further include a plurality of magnetic coils 501, and these magnetic coils 501 may be arranged side by side. Similarly, the fixed ends of the magnetic coils 501 also avoid the risk of the ends of different magnetic coils 501 touching each other.

FIG. 6 shows a magnetic connection module 600 according to one embodiment of the present invention.

As shown in FIG. 6 , the magnetic connection module 600 includes a magnetic coil 601 , such as the coil structure shown in the magnetic coil 200 shown in FIG. 2 a , the magnetic coil 300 shown in FIG. 3 a or the magnetic coil 400 shown in FIG. 4 a . The magnetic coil 601 is set on an inner base 605 with a plurality of transfer terminals 603, wherein the ends of the enameled wire in the magnetic coil 601 are respectively welded to one end of the transfer terminal 603, and the other end of the transfer terminal 603 is connected from the inside Seat 605 extends out.

The magnetic connection module 600 also includes a printed circuit board 607, which has a plurality of coupling through holes 609, these coupling through holes 609 correspond to the transfer terminals 603 of the inner seat 605, and are used to accommodate the transfer terminals 603 by The other end of the inner base 605 is extended so that the magnetic coil 601 is electrically coupled into the printed circuit board 607 .

Similar to the magnetic connection module 500 shown in FIG. 5 , the ends of each enameled wire in the magnetic coil 601 can be welded to the transfer terminal 603, so that the positions of these ends are fixed, thus avoiding the contact between the ends and causing Risk of short circuit.

In other examples, the magnetic coil in the magnetic connection module can also be arranged on a packaging board with multiple transfer terminals, such as a composite plastic board, wherein the ends of the enameled wires in the magnetic coil are respectively connected to these transfer terminals. The connecting terminal is adjacent to one end of the packaging board, and the other end of the transfer terminal is connected to the coupling through hole of the printed circuit board, and is electrically connected to the circuit of the printed circuit board through the coupling through hole.

7a and 7b illustrate a network connector 700 according to an embodiment of the present invention. Wherein, FIG. 7 a is an exploded schematic diagram of the network connector 700 , and FIG. 7 b is an overall schematic diagram of the network connector 700 .

As shown in FIG. 7 a and FIG. 7 b , the network connector 700 includes a magnetic connection module 701 , such as the magnetic connection module 600 shown in FIG. 6 . Wherein the magnetic connection module 701 has a printed circuit board 703 and a magnetic coil 705 .

In addition, the network connector 700 further includes: a spring pin terminal 707 , a terminal seat 709 and a shell 711 . Wherein, the terminal base 709 has a connection terminal 713 , and the pin terminal 707 and the terminal base 709 are assembled on the printed circuit board 703 respectively, and are electrically connected to the magnetic coil 705 through the printed circuit board 703 . The housing 711 is provided with a bracket 715 for fixing the magnetic connection module 701 equipped with the spring pin terminal 707 and the terminal base 709 .

It should be noted that the network connector 700 shown in FIG. 7a and FIG. 7b is only an example to illustrate the application of the magnetic coil of the present invention. Those skilled in the art should understand that the magnetic coil of the present invention is not limited to the structure of the network connector 700 , and it can also be applied to any other suitable circuit modules or devices such as connectors.

While the invention has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative and exemplary and not restrictive; the invention is not limited to the foregoing embodiments.

Other changes to the disclosed embodiments can be understood and effected by those of ordinary skill in the art by studying the specification, disclosure, drawings and appended claims. In the claims, the word "comprising" does not exclude other elements and steps, and the word "a" does not exclude a plurality. In the actual application of the invention, one component may perform the functions of multiple technical features cited in the claims. Any reference signs in the claims should not be construed as limiting the scope.

Claims (9)

1. A magnetic coil, characterized in that, comprising: a first magnetic core; a second magnetic core; A starter line pack which includes: A first enameled wire, which includes a first winding wound on the first magnetic core, and a first wire end and a second wire end located at both ends of the first winding; A second enameled wire, which includes a second winding wound on the first magnetic core, and a third wire end and a fourth wire end located at both ends of the second winding; Wherein, the second thread stub is electrically connected to the third thread stub; A secondary wire package which includes: A third enameled wire, which includes a third winding wound on the first magnetic core, and fifth and sixth wire ends located at both ends of the third winding; A fourth enameled wire, which includes a fourth winding wound on the first magnetic core, and seventh and eighth wire ends located at both ends of the fourth winding; Wherein, the fifth wire end, the sixth wire end, the seventh wire end and the eighth wire end are also wound on the second magnetic core, and the sixth wire end and the seventh wire end are electrically connect. 2. The magnetic coil according to claim 1, wherein the first winding has the same number of coils as the second winding, and the third winding has the same number of coils as the fourth winding . 3. The magnetic coil according to claim 1, wherein the fifth wire end, the sixth wire end, the seventh wire end and the eighth wire end are wound on the second magnetic core The number of coils is the same. 4. The magnetic coil according to claim 1, wherein the ends of the fifth wire end, the sixth wire end, the seventh wire end and the eighth wire end are all located in the second magnetic core on the same side. 5 . The magnetic coil according to claim 1 , wherein the sixth wire end and the seventh wire end are electrically connected by spot welding or paint stripping and immersion tin. 6 . 6. The magnetic coil according to claim 1, wherein the primary wire package further comprises: A fifth enameled wire, which is wound on the first magnetic core in the same winding manner as the first enameled wire, and the two wire ends of the fifth enameled wire are respectively connected to the two wire ends of the first enameled wire electrical connection; and A sixth enameled wire, which is wound on the first magnetic core in the same winding manner as that of the second enameled wire, and the two wire ends of the sixth enameled wire and the two wire ends of the second enameled wire are respectively electrical connection. 7. The magnetic coil according to claim 1 or 6, wherein the secondary wire package further comprises: A seventh enameled wire, which is wound on the first magnetic core and the second magnetic core in the same winding manner as the third enameled wire, and the two wire ends of the seventh enameled wire are connected with the first The two ends of the three enameled wires are electrically connected respectively; and An eighth enameled wire, which is wound on the first magnetic core and the second magnetic core in the same winding manner as the fourth enameled wire; The two wire ends of the four enameled wires are electrically connected respectively. 8. A magnetic connection module, characterized in that it comprises the magnetic coil according to any one of the preceding claims, and A printed circuit board has a plurality of welding pads, and the wire ends of the magnetic coil are respectively electrically connected to the plurality of welding pads. 9. A network connector, comprising the magnetic connection module according to claim 8, and: a spring pin terminal; A terminal block with connection terminals, wherein the spring pin terminal and the terminal block are respectively assembled on the printed circuit board, and are electrically connected to the magnetic coil through the printed circuit board; A shell is provided with a bracket, and the bracket is used for fixing the magnetic connection module equipped with the spring pin terminal and the terminal base.

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