TWI400836B - Electrical connector system - Google Patents

Description

Electrical connector system

The invention relates to an electrical connector system provided with a transformer and a common mode suppression module, in particular to a connection structure of a transformer and a common mode suppression module.

In the conventional electrical connector products with transformers and common mode suppression modules, it is common practice to connect the transformer coils to the common mode suppression coils, then install them on the built-in circuit board of the electrical connector, and finally transfer them to the outside. On the board. In the above conventional design, the coils of the transformer and the common mode suppression coil are manually wound, and the method of manual winding is inefficient, the quality of the coil is poor, and it is not conducive to automation in the production process, thereby causing the connector. The cost is large.

Therefore, it is necessary to improve the prior art to overcome the aforementioned drawbacks.

The technical problem to be solved by the present invention is to provide an electrical connector system having a transformer and a common mode suppression module, wherein the connection between the transformer and the common mode suppression module facilitates automatic production, improves efficiency, and reduces cost.

The technical problem to be solved by the present invention is achieved by the following technical solutions: an electrical connector system is provided for forming a network path, which comprises an external circuit board, an electrical connector mounted on the external circuit board, and a device on the external circuit board And a common mode suppression module and a transformer of the electrical connector, the network path has a first side and a second side of the input end and the output end, the transformer includes a first coil and a second coil, and the common mode suppression module includes a third coil and a fourth coil, the two ends of the first coil are connected to the first side, and the two ends of the second coil are electrically connected to one of the third and fourth coils, respectively The other ends of the third and fourth coils are connected to the second side of the network path, the transformer further comprising a double-connected magnetic core, the double-annular magnetic core being provided with two parallel through holes separated by an intermediate wall The first and second coils are wound together on the intermediate wall through the two through holes, the common mode suppression module is a buildup filter, the third and fourth coils are formed by a printed conductive layer, and the common mode The suppression module is provided with a plurality of guiding strips electrically connected to the third and fourth coils on the outer surface thereof, and the other ends of the third and fourth coils are electrically connected to the two ends of the second coil through the guiding strips. .

Compared with the prior art, the electrical connector system of the present invention separates the transformer and the common mode suppression coil independently and winds them in an automated manner, which not only improves the production efficiency of the transformer and the common mode suppression module, but also improves the coil. Quality, and easy to achieve automated welding production of transformers and common mode suppression modules in electrical connector systems.

The present invention will be further described below in conjunction with the drawings and embodiments.

100‧‧‧Electrical connector system

1‧‧‧External circuit board

3‧‧‧Electrical connector

31‧‧‧Insulated body

33‧‧‧ Built-in board

35‧‧‧ docking terminal

37‧‧‧Transfer terminal

331‧‧‧ conductive path

333‧‧‧Electrical sheet

5‧‧‧Transformers

51‧‧‧First coil

53‧‧‧second coil

55‧‧‧Center tap of the first coil

57‧‧‧Center tap of the second coil

7‧‧‧Common mode suppression module

71‧‧‧ Subject

73‧‧‧third coil

75‧‧‧fourth coil

77‧‧‧Guide feet

79‧‧‧ fifth coil

1'‧‧‧External circuit board

11'‧‧‧ conductive path

13'‧‧‧Conductor

3'‧‧‧Electrical connector

31'‧‧‧Insulated body

33'‧‧‧ Built-in board

331'‧‧‧ conductive path

333'‧‧‧ conductive sheet

35'‧‧‧Docking terminal

37'‧‧‧Transfer terminal

5'‧‧‧Transformer

51'‧‧‧First coil

53'‧‧‧second coil

55'‧‧‧Center tap of the first coil

57'‧‧‧ center tap of the second coil

7'‧‧‧Common mode suppression module

71'‧‧‧ Subject

73'‧‧‧third coil

75'‧‧‧fourth coil

77'‧‧‧ lead pin

79'‧‧‧ fifth coil

2‧‧‧External circuit board

21‧‧‧ conductive path

23‧‧‧Conductor

4‧‧‧Electrical connector

41‧‧‧Insulated body

43‧‧‧ Built-in board

431‧‧‧ conductive path

433‧‧‧Conductor

47‧‧‧Transfer terminal

45‧‧‧Docking terminal

6‧‧‧Transformers

61‧‧‧First coil

63‧‧‧second coil

65‧‧‧Center tap of the first coil

67‧‧‧ center tap of the second coil

8‧‧‧Common mode suppression module

81‧‧‧ Subject

83‧‧‧third coil

85‧‧‧fourth coil

87‧‧‧ lead pin

89‧‧‧ fifth coil

2'‧‧‧External circuit board

21'‧‧‧ conductive path

23'‧‧‧Conductor

4'‧‧‧Electrical connector

41'‧‧‧Insulated body

43'‧‧‧ Built-in board

431'‧‧‧ conductive path

433'‧‧‧ conductive sheet

45'‧‧‧Docking terminal

47'‧‧‧Transfer terminal

6'‧‧‧Transformer

61'‧‧‧First coil

63'‧‧‧second coil

65'‧‧‧Center tap of the first coil

67'‧‧‧ center tap of the second coil

8'‧‧‧Common mode suppression module

81'‧‧‧ Subject

83'‧‧‧third coil

85'‧‧‧fourth coil

87'‧‧‧ lead pin

89'‧‧‧ fifth coil

600‧‧‧Double toroidal core

601‧‧‧through hole

800‧‧‧Common mode suppression module

801‧‧‧guide

The first figure is an assembled perspective view of a first electrical connector system previously designed by the Applicant.

The second figure is a partially exploded view of the electrical connector system shown in the first figure.

The third figure is a schematic diagram of the cooperation of the built-in circuit board and the transformer and the common mode suppression module shown in the second figure.

The fourth figure is an assembled perspective view of a second electrical connector system previously designed by the Applicant.

Figure 5 is a partially exploded view of the electrical connector system shown in Figure 4.

The sixth figure is a schematic diagram of the cooperation between the external circuit board and the transformer and the common mode suppression module shown in the fifth figure.

The seventh drawing is an assembled perspective view of a third electrical connector system previously designed by the Applicant.

Figure 8 is a partially exploded view of the electrical connector system shown in Figure 7.

The ninth figure is a schematic diagram of the cooperation between the built-in circuit board and the transformer shown in the eighth figure.

The tenth figure is an assembled perspective view of a fourth electrical connector system previously designed by the Applicant.

Figure 11 is a partially exploded view of the electrical connector system shown in Figure 10.

The twelfth A diagram is a circuit diagram corresponding to a 10/100 network electrical connector system previously designed by the applicant and the present invention.

Figure 12B is a circuit diagram of a network path in Figure 12A.

The twelfth Cth is a circuit diagram of the fifth coil of the common mode suppression module of FIG.

The twelfth D-picture is a circuit diagram corresponding to a 10/100 network electrical connector system previously designed by the applicant and the present invention.

Figure 13 is a partially exploded view of the electrical connector system in accordance with the first embodiment of the present invention.

Figure 14 is a partially exploded view of the electrical connector system in accordance with the second embodiment of the present invention.

The fifteenth diagram is a partially exploded view of the electrical connector system in accordance with the third embodiment of the present invention.

Figure 16 is a partially exploded view of an electrical connector system in accordance with a fourth embodiment of the present invention.

Referring to the first prior design of the Applicant disclosed in Figures 1 to 3 and Figures 12A through 12C, an electrical connector system 100 is disclosed that includes an external circuit board 1 The electrical connector 3 mounted on the external circuit board 1 and the transformer 5 and the common mode suppression module 7 mounted in the electrical connector 3. The electrical connector system 100 is formed with two network paths for transmitting differential signals, and each of the network paths has a first side P and a second side O which are mutually input and output ends.

The electrical connector 3 includes an insulative housing 31 having a docking space (not labeled), a built-in circuit board 33 mounted on the insulative housing 31, a side of the built-in circuit board 33, and extending into the docking space. (unlabeled) complex docking terminal 35, disposed on the other side of the built-in circuit board 33 and connecting the built-in circuit board 33 to the plurality of switching terminals 37 of the external circuit board 1, the docking terminal 35 serving as the second network path Side O, the transition terminal 37 serves as the first side P of the network path. The built-in circuit board 33 is provided with a plurality of conductive paths 331 and a plurality of conductive sheets 333 connected to the conductive paths 331.

The transformer 5 includes a first coil 51 and a second coil 53 (refer to FIG. 12A in combination), and the first and second coils 51, 53 are respectively provided with center taps 55, 57, and the first of the transformers 5, Both ends of the second coils 51, 53 and the center taps 55, 57 are soldered to a portion of the conductive sheets 333 of the built-in circuit board 33. The common mode suppression module 7 includes an insulated main body 71, third, fourth, and fifth coils 73, 75, and 79 housed in the main body 71 and wound around the same magnetic core (not shown) (refer to FIG. A is shown in FIG. 7 and a plurality of guiding pins 77 disposed on the main body 71. The two ends of the third, fourth, and fifth coils 73, 75, and 79 are respectively connected to the respective guiding pins 77, and the surfaces of the guiding pins 77 are respectively Soldering to the remaining portion of the conductive sheet 333. Both ends of the first coil 51 are electrically connected to the transfer terminal 37 via a part of the conductive path 331 of the built-in circuit board 33, and the center tap 55 of the first coil 51 is connected to a ground line (not shown) of the built-in circuit board 33. The two ends of the second coil 53 of the transformer 5 and the center tap 57 are electrically connected to the third, fourth, and fifth coils 73, 75, and 79 of the common mode suppression module 7 through the partial conductive path 331 and the conductive pin 77. One end. The other ends of the third and fourth coils 73 and 75 are electrically connected to the mating terminal 35 through the conductive pin 331 and the partial conductive line 331 of the built-in circuit board 33. The other end of the fifth coil 79 is connected to the built-in circuit board 33. Ground line (not shown).

In this prior design, the position of the transformer 5 and the common mode suppression module 7 can be interchanged, that is, the first coil 51 of the transformer 5 is connected to the mating terminal 35 through the conductive path 331 of the built-in circuit board 33, and the common mode is suppressed. The other end of the third and fourth coils 73, 75 of the module 7 is connected to the transfer terminal 37 via a part of the conductive path 331 of the built-in circuit board 33. Thus, the docking terminal 35 serves as the first side P of the network path, and the switching terminal 37 serves as the second side O of the network path.

Please refer to the second to sixth figures and the second to the twelfth C to the applicant's second Previous design, which discloses an electrical connector system 100 that includes an external circuit board 1', an electrical connector 3' mounted on the external circuit board 1', a transformer 5' mounted on the external circuit board 1', and a common mode suppression module 7'. The electrical connector system 100 is formed with two network paths for transmitting differential signals. Each network path has a first side P' and a second side of the input and output ends. O'.

The electrical connector 3' includes an insulative housing 31' having a docking space (not labeled), a built-in circuit board 33' mounted on the insulative housing 31', a side of the built-in circuit board 33' and extending into the docking space ( The plurality of docking terminals 35' not shown) are disposed on the other side of the built-in circuit board 33' and connect the built-in circuit board 33' to the plurality of adapter terminals 37' of the external circuit board 1', and the aforementioned docking terminal 35' serves as a network The second side of the pathway O'. The aforementioned built-in circuit board 33' is provided with a plurality of conductive paths 331'. The external circuit board 1' is provided with a plurality of conductive paths 11' and a conductive sheet 13' connected to the conductive path 11'.

The foregoing transformer 5' includes a first coil 51' and a second coil 53' (refer to FIG. 12B in combination), and the first and second coils 51', 53' are respectively provided with center taps 55', 57'. Both ends of the first and second coils 51', 53' of the transformer 5' and the center taps 55', 57' are soldered to a portion of the conductive sheet 13' on the external circuit board 1'. The common mode suppression module 7' includes an insulated main body 71', third, fourth, and fifth coils 73', 75', 79' housed in the main body 71' and wound around the same magnetic core (not shown). (in conjunction with FIG. 12B) and the plurality of guiding legs 77' disposed on the main body 71', the two ends of the third, fourth, and fifth coils 73', 75', and 79' are respectively connected to the foregoing The lead leg 77', the surface of each lead leg 77' is soldered to the remaining portion of the conductive sheet 13'. One end of the third and fourth coils 73', 75' is sequentially passed through the conductive pin 77', the partial conductive path 11' of the external circuit board 1', the transfer terminal 37', and the conductive path 331' of the internal circuit board 33'. The two ends of the fifth coil 79' are electrically connected to the opposite ends of the second coil 53'. The other ends are electrically connected to the two ends of the second coil 53' through the conductive legs 11' of the external circuit board 1'. The ground line is connected to the external circuit board 1', and the other end is connected to the center tap 57' of the second coil 53' of the transformer 5'. Center of the first coil 51' The tap 55' is connected to a ground line (not shown) of the external circuit board 1', and both ends of the first coil 51' serve as the first side P' of the aforementioned network path.

In this prior design, the position of the transformer 5' and the common mode suppression module 7' may also be interchanged, that is, the first coil 51' of the transformer 5' passes through the conductive path 11' of the external circuit board 1', and the transfer terminal 37 'The conductive path 331' of the built-in circuit board 33' is connected to the mating terminal 35', and the mating terminal 35' serves as the first side P' of the network path, and the third and the third of the common mode suppression module 7' The aforementioned one end of the four coils 73', 75' serves as the second side O' of the network path.

Referring to the third prior design of the Applicant disclosed in Figures 7 to IX and Twelfth A to Twelf C, an electrical connector system 100 including an external circuit board 2 is disclosed. An electrical connector 4 mounted on the external circuit board 2, and a common mode suppression module 8 and a transformer 6 disposed on the external circuit board 2 and the electrical connector 4 to form a plurality of network paths, the network paths having mutual It is the first side P and the second side O of the input end and the output end. The transformer 6 includes a first coil 61 and a second coil 63. The common mode suppression module 8 includes a third coil 83 and a fourth coil 85. The third and fourth coils 83 and 85 are wound together on the same core. The common mode suppression module 8 further includes a main body 81 and a plurality of guiding pins 87 disposed on the main body 81. The third and fourth coils 83 and 85 are received in the main body 81 and connected to the guiding pins 87. The two ends of the first coil 61 are connected to the first side P, and the two ends of the second coil 63 are electrically connected to one ends of the third and fourth coils 83, 85, respectively, and the third and fourth coils 83, 85 The other end is connected to the second side O of the network path. The electrical connector 4 is provided with a built-in circuit board 43 inside the electrical connector 4 and a plurality of adapter terminals 47 connecting the internal circuit board 43 and the external circuit board 2. The transformer 6 is disposed on the built-in circuit board 43 and is common mode. The suppression module 8 is mounted on the external circuit board 2, and the external circuit board 2 and the built-in circuit board 43 are respectively provided with a plurality of conductive paths 21 and 431, and both ends of the second coil 63 sequentially pass through the conductive path 431 on the built-in circuit board 43. The transfer terminal 47, the conductive path 21 on the external circuit board 2, and the lead pin 87 are electrically connected to the third and fourth coils 83 and 85. The aforementioned built-in circuit board 43 and the external circuit board 2 are also respectively provided with plural The conductive sheets 433 and 23 are connected to the conductive paths 431 and 21, and the first and second coils 61 and 63 are respectively soldered to the conductive sheets 433 of the built-in circuit board 43. The surface of the lead pins 87 is soldered to the external circuit board 2. Conductive sheet 23.

The first and second coils 61 and 63 are respectively provided with center taps 65 and 67. The center tap 65 of the first coil 61 is grounded. The common mode suppression module 8 further includes a fifth coil 89 wound on the same core. The center tap 67 of the second coil 63 is electrically connected to the fifth coil 89 and grounded through the fifth coil 89.

Referring to the fourth prior design of the Applicant disclosed in the tenth, eleventh, and twelfth to twenty-secondth C, an electrical connector system 100 including an external circuit board 2 is disclosed. ', an electrical connector 4' mounted on the external circuit board 2', and a transformer 6' and a common mode suppression module 8' mounted on the external circuit board 2' and the electrical connector 4' to form a plurality of networks a path, the network path has a first side P' and a second side O' which are mutually input and output ends, and the transformer 6' includes a first coil 61' and a second coil 63', and the common mode suppression module 8' The third coil 83' and the fourth coil 85' are included, and the third and fourth coils 83' and 85' are wound on the same core, and the common mode suppression module 8' is further provided with a main body 81' and The plurality of lead pins 87' are disposed on the main body 81', and the third and fourth coils 83' and 85' are received in the main body 81' and connected to the lead pins 87'. Both ends of the first coil 61' are connected to the first side P', and two ends of the second coil 63' are electrically connected to one ends of the third and fourth coils 83', 85', respectively, third and fourth. The other end of the coil 83', 85' is connected to the second side O' of the network path. The electrical connector 4' is provided with a built-in circuit board 43' inside the electrical connector 4' and a plurality of transfer terminals 47' connecting the internal circuit board 43' and the external circuit board 2'. The common mode suppression module 8 is provided. 'Set on the built-in circuit board 43', the transformer 6' is mounted on the external circuit board 2', and the external circuit board 2' and the built-in circuit board 43' are respectively provided with a plurality of conductive paths 21', 431', third, Both ends of the four coils 83', 85' are sequentially passed through the conductive pin 87', the conductive path 431' on the built-in circuit board 43', the transfer terminal 47', and the conductive path 21' on the external circuit board 2'. Both ends of the two coils 63' are electrically connected. The aforementioned built-in circuit board 43' and the external circuit board 2' are also respectively provided with a plurality of connections The conductive sheets 433', 23' of the conductive paths 431', 21', the first and second coils 61', 63' are soldered to the conductive sheet 23' of the external circuit board 2', and the surface of the leading pin 87' is soldered. The conductive sheet 433' of the built-in circuit board 43'. The electrical connector 4' further includes a plurality of docking terminals 45' mounted on the built-in circuit board 43', and the docking terminal 45' serves as the second side O' of the network path.

The first and second coils 61', 63' are each provided with a center tap 65', 67', the center tap 65' of the first coil 61' is grounded, and the common mode suppression module 8' further includes a winding The fifth coil 89' on the magnetic core, the center tap 67' of the second coil 63' is electrically connected to the fifth coil 89', and is grounded through the fifth coil 89'.

In the conventional connector product, the transformer and the common mode suppression coil are arranged in a joint manner, and the module of the transformer coil and the common mode suppression coil needs to be manually wound, the efficiency is low and the quality is poor, and the connector cost is large. . In each of the previous designs, we separately and separately set the coils of the transformer and the common mode suppression module and automate the winding, which not only improves the production efficiency of the transformer and the common mode suppression module, but also The quality of the coil is improved, and the automated welding production of the transformer and the common mode suppression module in the electrical connector is easy to implement. Obviously, the transformer coil and the common mode suppression coil of the foregoing prior designs may also be connected by other conductors than the foregoing various designs, as long as the conductor facilitates the connection of the coils.

In addition, in order to save cost and facilitate assembly, the common mode suppression module can also be a standard patch coil, which can be conveniently surface soldered to the built-in circuit board. The core of the common mode suppression module may be a single ring or a double ring, and coils of the common mode suppression module of the plurality of network paths are wound around the core. In each of the previous designs, the transformer coils are single toroidal cores, and the first and second coils are wound together in the core; the common mode suppression module can be provided without the fifth coil, and the center tap of the second coil is directly grounded. (Refer to Figure 12C) to save costs.

The four previously designed electrical connector systems are all compliant with the 10/100 network transmission standard. Two network channels, obviously, the electrical connector system that meets the aforementioned design can be set with a different number of network channels to meet different transmission speed requirements, as shown in Figure 12D, which provides 10/100 compliance. A circuit diagram of the network transmission speed standard.

Please refer to the thirteenth to sixteenth drawings, which are partially exploded perspective views showing four embodiments of the present invention, and the circuit diagrams thereof are referred to in the twelfth to twenty-secondth C drawings. For further improvement, the present invention designs a previously designed transformer (not shown) as a double toroidal core having two parallel vias 601 separated by an intermediate wall (not labeled). The first and second coils are wound together on the intermediate wall through the two through holes 601. The common mode suppression module 800 is a multilayer filter, and the third, fourth, and fifth coils (not shown) are formed of a printed conductive layer, and are formed on the surface of the common mode suppression module 800, and the third and fourth, The fifth lead is electrically connected to the plurality of guiding strips 801, and one of the third, fourth, and fifth coils is finally electrically connected to both ends of the second coil and the center tap through the guiding tabs 801. The remaining structures and connection relationships of the various embodiments of the present invention are the same as the four previous designs described above, respectively.

The magnetic core of the transformer is arranged in a double ring shape, so that the magnetic induction coefficient of the transformer coil can be improved; the common mode suppression module 800 is a laminated filter, and the third and fourth coils are formed by a printed conductive layer, and the structure can be Greatly reduce the size of the common mode suppression module, and improve its electrical performance, facilitating automated placement.

In summary, this creation has indeed met the requirements of the invention patent, and applied for a patent in accordance with the law. However, the above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or variations in accordance with the spirit of the present invention. It should be covered by the following patent application.

600‧‧‧Double toroidal core

601‧‧‧through hole

800‧‧‧Common mode suppression module

801‧‧‧guide

Claims (11)

An electrical connector system for forming a network path, comprising: an external circuit board; an electrical connector mounted on the external circuit board; and a common mode suppression module and a transformer mounted on the external circuit board and the electrical connector, The network path has a first side and a second side of the input end and the output end, the transformer includes a first coil and a second coil, and the common mode suppression module includes a third coil and a fourth coil, and the two ends of the first coil are connected On the first side, the two ends of the second coil are electrically connected to one ends of the third and fourth coils, respectively, and the other ends of the third and fourth coils are connected to the second side of the network path, wherein the transformer further includes a double-ring magnetic core, wherein the double-ring magnetic core is provided with two parallel through holes separated by an intermediate wall, and the first and second coils are wound around the intermediate wall through the two through holes, and the common mode suppression The module is a multilayer filter, and the third and fourth coils are formed by a printed conductive layer, and the common mode suppression module is provided with a plurality of guiding strips electrically connected to the third and fourth coils on the outer surface thereof, and a third And the fourth coil Terminal tab electrically connected with the final ends of the second coil by said guide. The electrical connector system of claim 1, wherein the electrical connector is provided with a built-in circuit board mounted inside the electrical connector, the built-in circuit board is provided with a plurality of conductive paths, the transformer and the common mode rejection mode The groups are all mounted on the built-in circuit board, and the two ends of the second coil are electrically connected to the third and fourth coils through the conductive path and the guiding piece. The electrical connector system of claim 1, wherein the external circuit board is provided with a plurality of conductive paths, and the transformer and the common mode suppression module are both mounted on the external circuit board, and the second coil is The terminal is electrically connected to the third and fourth coils through the conductive path and the guiding piece. The electrical connector system of claim 1, wherein the electrical connector is provided with a built-in circuit board inside the electrical connector and a plurality of adapter terminals connecting the internal circuit board and the external circuit board, and the transformer is disposed on The common mode suppression module is mounted on the external circuit board, and the external circuit board and the built-in circuit board are respectively provided with a plurality of conductive paths, and the two ends of the second coil sequentially pass through the conductive path and the transfer terminal of the built-in circuit board. The conductive path of the external circuit board and the guiding piece are electrically connected to the third and fourth coils. The electrical connector system of claim 1, wherein the electrical connector is provided with a built-in circuit board inside the electrical connector and a plurality of adapter terminals connecting the internal circuit board and the external circuit board, the common mode suppression The module is disposed on the built-in circuit board, and the transformer is mounted on the external circuit board. The external circuit board and the built-in circuit board are respectively provided with a plurality of conductive paths, and the ends of the third and fourth coils sequentially pass through the guiding piece and the built-in circuit board. The conductive path, the transfer terminal and the conductive path of the external circuit board are electrically connected to the second coil. The electrical connector system according to any one of claims 2 to 5, wherein the electrical connector further comprises a docking terminal mounted on the built-in circuit board, and a connection terminal connecting the built-in circuit board and the external circuit board And the docking terminal can be used as one side of the network path, and the switching terminal can serve as the other side of the network path. The electrical connector system of claim 1, wherein the first and second coils are each provided with a center tap, the center of the first coil is grounded, and the common mode suppression module is formed by a conductive path. The five coils, the center tap of the second coil is electrically connected to the fifth coil, and is grounded through the fifth coil. The electrical connector system of claim 1, wherein the electrical connector system is further formed with a plurality of the aforementioned network paths. An electrical connector comprising: a built-in circuit board; a common mode suppression module and a transformer mounted on the built-in circuit board; The electrical connector has a first side and a second side of the input end and the output end, the transformer includes a first coil and a second coil, and the common mode suppression module includes a third coil and a fourth coil, and both ends of the first coil Connected to the first side, the two ends of the second coil are electrically connected to one ends of the third and fourth coils, respectively, and the other ends of the third and fourth coils are connected to the second side, wherein the transformer further includes a double ring a magnetic core, the double-ring magnetic core is provided with two parallel through holes separated by an intermediate wall, and the first and second coils are wound around the intermediate wall through the two through holes, the common mode suppression mode The first and fourth coils are formed by a printed conductive layer, and the common mode suppression module is provided on the outer surface thereof with a plurality of guiding strips electrically connected to the third and fourth coils, the second Both ends of the coil are electrically connected to the third and fourth coils through the guide tabs. The electrical connector of claim 9, wherein the built-in circuit board is provided with a plurality of conductive paths, and the transformer and the common mode suppression module are respectively mounted on the same side of the built-in circuit board through a surface mounting technology and through the conductive path Connected, no other electronic components are placed on the conductive path between the two. The electrical connector of claim 9, wherein the first and second coils are each provided with a center tap, the center of the first coil is grounded, and the common mode suppression module further comprises a coil wound on the same core. The fifth coil, the center tap of the second coil is electrically connected to the fifth coil, and is grounded through the fifth coil.