TWI453995B - Electrical connector and electrical connecting method of the same - Google Patents

Description

Electrical connector and electrical connection method thereof

The invention relates to an electrical connector and an electrical connection method thereof, in particular to a pluggable electrical connector and an electrical connection method for docking the electrical connector with a docking circuit board.

The prior art relating to the present invention can be found in U.S. Patent No. 6,142,802, issued on Nov. 7, 2000. The patent discloses an electrical connector having a body and a plurality of first and second terminals retained on the body. The docking connector that interfaces with the connector has a sub-board. The sub-circuit board is provided with a plurality of first conductive sheets and a plurality of second conductive sheets. When the electrical connector is docked with the mating connector, the first terminal is electrically connected to the first conductive strip of the sub-board to transmit the differential signal, the power signal, and the ground. The second terminal is electrically connected to the second conductive strip of the sub-board to transmit the power signal and the ground.

However, the number of terminals in the electrical connector thus arranged is small, so that only a small amount of signals can be transmitted.

Therefore, it is necessary to modify the conventional electrical connector to overcome the above drawbacks.

In view of the above, it is an object of the present invention to provide an electrical connector and an electrical connection method that can transmit a plurality of signals.

To achieve the foregoing objective, the present invention provides an electrical connector including a first set of terminals and a pair of second sets of terminals, the first set of terminals including a first upper terminal and a first lower contact therebetween forming a first slot a first upper terminal is provided with a first upper contact portion located above the first slot and transmitting a ground signal, and the first lower contact terminal is provided with a first under the first slot and transmitting a ground signal The contact portion, each of the second group of terminals includes a second upper terminal and a second lower contact terminal formed therebetween, and the pair of second upper terminals are provided with a pair of second upper contact portions located above the second slot. The pair of second lower contact terminals are provided with a pair of second lower contact portions under the second slot and transmitting differential signal pairs, wherein each of the second group of terminals further includes a second lower conductive terminal, each of the second The second lower conductive terminal is provided with a second lower conductive portion located below the second slot and aligned with the second lower contact portion in the mating direction to transmit a low frequency signal.

The present invention provides an electrical connector method comprising the steps of: (1) providing an electrical connector, the electrical connector comprising a first set of terminals and a pair of second set of terminals, the first set of terminals comprising a first An upper terminal and a first lower contact terminal, the second group of terminals including a second upper terminal, a second lower contact terminal and a second lower conductive terminal; (2) providing a docking circuit board having upper and lower surfaces, The upper surface of the docking circuit board is provided with a first row of conductive sheets, which includes an upper grounding strip and a pair of upper differential signal sheets, and the lower surface of the docking circuit board is provided with a second row of conductive sheets, including a lower grounding strip and a For the differential signal chip, the lower surface of the docking circuit board is further provided with two lower low frequency signal chips aligned with the pair of differential signal chips in the mating direction; (3) the docking circuit board is docked with the electrical connector, such that The second lower conductive terminal is in contact with the two lower low frequency signal sheets to transmit the low frequency signal; (4) the first upper terminal is in contact with the upper ground plane to transmit the ground signal, and the pair of second upper terminals and the pair of upper differential signal sheets Contact to transmit differential signals (5) such that the first contact terminal contacting with the ground plate to transmit a ground signal, the pair of the second contact terminal pair of differential signals with the contact piece to a differential signal transmission.

Compared with the prior art, the present invention has the following beneficial effects: the present invention can configure multiple pairs of differential signal slices and control signal slices without increasing the size of the docking circuit board, and grounding each pair of signal slices sheet. In this way, multiple pairs of differential signals and control signals can be transmitted and a ground signal can be transmitted between each pair of differential signals.

100‧‧‧Electrical connector

1‧‧‧Insulating body

11‧‧‧ beams

12‧‧‧ openings

2‧‧‧Terminal module

21‧‧‧First Terminal Module

210‧‧‧First insulation sheet

211‧‧‧first upper terminal

2111‧‧‧First Upper Contact

2112‧‧‧First installation department

2113‧‧‧First upper connection

212‧‧‧First contact terminal

2121‧‧‧First contact

2122‧‧‧First installation department

2123‧‧‧First lower connection

214‧‧‧first slot

22‧‧‧Second terminal module

220‧‧‧Second insulation sheet

221‧‧‧Second upper terminal

2211‧‧‧Second Upper Contact

2212‧‧‧Second upper installation department

2213‧‧‧Second upper connection

222‧‧‧Second lower contact terminal

2221‧‧‧Second lower contact

2222‧‧‧Second installation department

2223‧‧‧Second lower connection

223‧‧‧Second lower conductive terminal

2231‧‧‧Second lower conductive part

2232‧‧‧Second installation foot

2233‧‧‧Second lower connection

224‧‧‧second slot

3‧‧‧shading cover

31‧‧‧ docking

32‧‧‧ containment chamber

33‧‧‧Inlet

800‧‧‧ docking board

80‧‧‧ docking end

81‧‧‧ first surface

811‧‧‧ Grounding piece

812‧‧‧Differential signal piece

813‧‧‧Cable soldering piece

82‧‧‧ second surface

821‧‧‧ Grounding piece

822‧‧‧Differential signal piece

823‧‧‧Control signal piece

824‧‧‧Cable soldering piece

21'‧‧‧First Terminal Module

211'‧‧‧first upper terminal

2111’‧‧‧First Upper Contact

212'‧‧‧First contact terminal

2121'‧‧‧First contact

213'‧‧‧First lower conductive terminal

2131'‧‧‧First lower conductive part

800’‧‧‧ docking board

82’‧‧‧ second surface

821’‧‧‧ Grounding piece

822’‧‧‧Differential signal piece

823’‧‧‧Control signal

825’‧‧‧Power film

826’‧‧‧ Grounding piece

827’‧‧‧ Third row of conductive sheets

828’‧‧‧Second row of conductive sheets

21’’‧‧‧First Upper Terminal Module

211’’‧‧‧First upper terminal

2112’’‧‧‧First Installation Department

212’’‧‧‧First contact terminal

2122’’‧‧‧First installation department

213’’‧‧‧First lower conductive terminal

2132’’‧‧‧First installation foot

The first figure is an exploded view of the electrical connector and the mother board of the first embodiment of the present invention.

The second figure is another exploded view of the electrical connector and the mother board shown in the first figure.

The third figure is a combination diagram of the insulative housing and the terminal module of the electrical connector shown in the first figure.

The fourth figure is a cross-sectional view taken along line IV-IV in the third figure when the docking board is inserted into the insulative housing, wherein the first terminal module omits the first insulating sheet.

The fifth figure is a cross-sectional view taken along the line V-V in the third figure when the docking board is inserted into the insulative housing, wherein the second terminal module omits the second insulating sheet.

The sixth figure is a view of the first surface of the docking circuit board.

The seventh figure is a view of the second surface of the docking circuit board.

The eighth figure is a view of the second surface of the docking circuit board of the second embodiment.

The ninth drawing is a cross-sectional view of the mating circuit board of the second embodiment inserted into the first terminal module in which the first insulating sheet is omitted.

The tenth diagram is a view of the first terminal module of the third embodiment.

The eleventh drawing is a cross-sectional view of the mating circuit board of the third embodiment inserted into the first terminal module in which the first insulating sheet is omitted.

As shown in the first to fifth figures, the electrical connector 100 in accordance with the present invention is mounted on the mother board 900 and can interface with a mating connector (not shown). The docking connector has a docking circuit board 800. The docking circuit board 800 can be inserted and removed in the electrical connector 100.

The electrical connector 100 includes an insulative housing 1 , a plurality of terminal modules 2 held in the insulative housing 1 , and a shielding cover 3 covering the insulative housing 1 .

Referring to the first to third figures, the insulative housing 1 is provided with a beam 11 and an opening 12 above the beam 11.

Referring to the first figure, the plurality of terminal modules 2 in the first embodiment of the present invention include a plurality of first terminal modules 21 and second terminal modules 22. In conjunction with the fourth figure, each of the first terminal modules 21 includes a first insulating sheet 210, a first upper terminal 211, and a first lower contact terminal 212. The first upper terminal 211 and the first lower contact terminal 212 may be held by injection molding to form the first insulating sheet 210 of the plastic material. The first insulating sheet 210 may be first disposed, and the first upper terminal 211 and the first lower contact terminal 212 may be buried in the first insulating sheet 210.

The first upper terminal 211 includes a first upper contact portion 2111, a first upper mounting portion 2112, and a first upper connecting portion 2113. The first upper connecting portion 2113 is located between the first upper contact portion 2111 and the first upper mounting portion 2112. The first lower contact terminal 212 includes a first lower contact portion 2121, a first lower mounting portion 2122, and a first lower connecting portion 2123. The first lower connecting portion 2123 is located between the first lower contact portion 2121 and the first lower mounting portion 2122. A first slot 214 is formed between the first upper contact portion 2111 and the first lower contact portion 2121. The first upper contact portion 2111 is located substantially horizontally above the first slot 214. The first lower contact portion 2121 is bent to be substantially horizontally below the first slot 214.

The first upper mounting portion 2112 extends horizontally and can be soldered to the mother board 900 by surface mounting techniques. The first lower mounting portion 2122 is provided in a perforated shape and extends downward, so that it can be electrically connected to the mother circuit board 900 by crimping.

Each of the second terminal modules 22 includes a second insulating sheet 220 , a second upper terminal 221 , a second lower contact terminal 222 , and a second lower conductive terminal 223 . The second upper terminal 221, the second lower contact terminal 222, and the second lower conductive terminal 223 may be held by injection molding to form the second insulating sheet 220 of the plastic material. The second insulating sheet 220 may be provided first, and the second upper terminal 221, the second lower contact terminal 222, and the second lower conductive terminal 223 may be embedded in the second insulating sheet 220.

The second upper terminal 221 includes a second upper contact portion 2211, a second upper mounting portion 2212, and a second upper connecting portion 2213. The second upper connecting portion 2213 is located between the second upper contact portion 2211 and the second upper mounting portion 2212. The second lower contact terminal 222 includes a second lower contact portion 2221, a second lower mounting portion 2222, and a second lower connecting portion 2223. The second lower connecting portion 2223 is located between the second lower contact portion 2221 and the second lower mounting portion 2222. The second lower conductive terminal 223 includes a second lower conductive portion 2231, a second lower mounting leg 2232, and a second lower connecting portion 2233. The second lower connecting portion 2233 is located between the second lower conductive portion 2231 and the second lower mounting leg 2232. A second slot 224 is formed between the second upper contact portion 2211 and the second lower conductive portion 2231. The second upper contact portion 2211 is located substantially horizontally above the second slot 224. The second lower contact portion 2221 and the second lower conductive portion 2231 are bent to be substantially horizontally below the second slot 224. The second lower conductive portion 2231 and the second lower contact portion 2221 are aligned in the mating direction. The second lower contact portion 2221 is closer to the opening 12 than the second upper contact portion 2211, and the second lower conductive portion 2231 is further away from the opening 12 than the second upper contact portion 2211.

The second upper mounting portion 2212 extends horizontally, so that it can be soldered to the female by surface mounting technology. On the circuit board 900. The second lower mounting portion 2222 and the second lower mounting leg 2232 are disposed in a perforated shape and extend downward, so that the female circuit board 900 can be electrically connected by crimping.

Referring to the first and second figures, the shielding cover 3 is provided with an abutting surface 31, a receiving cavity 32 and an insertion opening 33 located below the shielding cover 3.

Referring to FIG. 1 to FIG. 5 , when the electrical connector 100 is assembled, the terminal modules 2 are held in the insulative housing 1 in the order of the first terminal module 21 and then the pair of second terminal modules 22 . . The first slot 214 and the second slot 224 are respectively aligned with the opening 12 of the insulative housing 1 along the mating direction. The insulative housing 1 and the terminal module 2 are inserted into the receiving cavity 32 through the insertion opening 33 of the shielding cover 3.

As shown in the sixth and seventh figures, the docking circuit board 800 has a docking end 80, a first surface 81, and a second surface 82. The first surface 81 of the docking circuit board 800 is provided with five grounding strips 811 and four pairs of differential signal sheets 812 arranged in a row near the mating end 80, and a plurality of cable soldering strips 813 arranged in a row away from the mating end 80. Each pair of differential signal slices 812 is located between two adjacent ground pads 811. The plurality of grounding strips 811 and the plurality of pairs of differential signal strips 812 are arranged in a row. The length of the grounding lug 811 in the mating direction is longer than the corresponding length of the differential signal sheet 812. The grounding strip 811 is closer to the mating end 80 than the differential signal patch 812.

The second surface 82 of the docking circuit board 800 is provided with five grounding strips 821, four pairs of control signal sheets 823, four pairs of differential signal sheets 822, and a plurality of cable soldering strips 824 arranged in a row away from the butting end 80. . A pair of control signal sheets 823 and a pair of differential signal sheets 822 are aligned in the mating direction and are located between adjacent two ground strips 821. The control signal slice 823 is closer to the butt end 80 than the differential signal slice 822. The length of the grounding lug 821 in the mating direction is longer than the corresponding length of the control signal sheet 823 or the differential signal sheet 822. The front end of the grounding lug 821 is closer to the mating end 80 than the front end of the control signal sheet 823. control The signal slice 823 can also be set as other low frequency signal slices as needed.

The grounding piece 811 of the first surface 81 and the grounding piece 821 of the second surface 82 partially overlap in the up and down direction. The differential signal piece 812 of the first surface 81 and the differential signal piece 822 of the second surface 82 partially overlap in the up and down direction.

When the electrical connector 100 is mated with the mating connector (not shown), the docking circuit board 800 is inserted into the receiving cavity 32 through the mating surface 31, and then inserted into the first and second slots 214 through the opening 12 of the insulative housing 1. 224.

In conjunction with the fourth to seventh embodiments, the first upper contact portion 2111 of the first upper terminal 211 of the first terminal module 21 is in contact with the grounding strip 811 on the first surface 81 of the docking circuit board 800 to transmit ground. The signal; the first lower contact portion 21121 of the first lower contact terminal 212 contacts the ground strip 821 on the second surface 82 of the docking circuit board 800 to transmit a ground signal. At the same time, the second upper contact portion 2211 of the two second upper terminals 221 of the adjacent two second terminal modules 22 is in contact with the differential signal piece 812 on the first surface 81 of the docking circuit board 800 to transmit a differential signal; The second lower contact portion 2221 of the two second lower contact terminals 222 is in contact with the differential signal sheet 822 of the second surface 82 to transmit a differential signal. The second lower conductive portion 2231 of the two second lower conductive terminals 223 is in contact with the two control signal sheets 823 to transmit a control signal.

The electrical connection method of the first embodiment includes the following steps: (1) providing an electrical connector 100, the electrical connector 100 including a plurality of first terminal modules 21 and a plurality of pairs of second terminal modules 22, The first terminal module 211 includes a first upper terminal 211 and a first lower contact terminal 212, and each of the second terminal modules 22 includes a second upper terminal 221, a second lower contact terminal 222, and a second lower conductive terminal 223; 2) providing a docking circuit board 800 having a first surface 81 and a second surface 82. The first surface 81 of the docking circuit board 800 is provided with a first row of conductive strips including a plurality of grounding strips 811 and a plurality of pairs of differential signals The second surface 82 of the docking circuit board is provided with a second row of conductive sheets, which includes a plurality of grounding strips 821 and a plurality of pairs of differential signal sheets 822. The second surface 82 of the docking board 800 is further provided with a plurality of pairs of control The signal sheet 823; (3) mating the docking circuit board 800 with the electrical connector 100 such that the second lower conductive terminal 223 is in contact with the control signal sheet 823 to transmit a low frequency control signal; (4) the first upper terminal 211 is The grounding strip 811 is in contact to transmit a ground signal, the second upper terminal 221 is in contact with the differential signal sheet 812 to transmit a differential signal; (5) the first lower contact terminal 212 is brought into contact with the grounding strip 821 to transmit a ground signal, and a pair of second The contact terminal 222 is in contact with a pair of differential signal sheets 822 to transmit a differential signal.

The docking board 800 can be configured with a plurality of pairs of differential signal chips and control signal chips without increasing the size, and a grounding strip is disposed between each pair of signal sheets. In this way, multiple pairs of differential signals and control signals can be transmitted and a ground signal can be transmitted between each pair of differential signals.

The second terminal module 22 in the second embodiment has the same structure as the second terminal module 22 in the first embodiment shown in the fourth embodiment. Referring to the ninth diagram, the first terminal module 21' in the second embodiment includes a first upper terminal 211' provided with a first upper contact portion 2111' and a first lower contact provided with a first lower contact portion 2121'. The terminal 212' and the first lower conductive terminal 213' provided with the first lower conductive portion 2131'.

The first surface 81 of the docking board 800' used in the second embodiment is the same as that shown in the sixth figure, and the second surface 82' is provided in the structure shown in the eighth figure. As shown in the eighth diagram, the second surface 82' of the docking circuit board 800' is provided with a second row of conductive sheets 828' and a third row of conductive sheets 827'. The third row of conductive strips 827' is closer to the butted end 80' than the second row of conductive strips 828'. The third row of conductive sheets 827' includes a plurality of control signal sheets 823', a plurality of power supply sheets 825', and a grounding strip 826'. The control signal piece 823', the power supply piece 825', and the grounding piece 826' are all low frequency signal pieces. Second row of conductive sheets 828' includes a plurality of ground straps 821' and a plurality of pairs of differential signal patches 822'. Each pair of differential signal patches 822' is located between adjacent ground straps 821'.

When the docking board 800' is inserted, the conductive sheets on the first surface 81 of the docking board 800' are in contact with and electrically connected to the first upper terminal 211' or the second upper terminal 221. The third row of conductive strips 827' on the second surface 82' of the docking circuit board 800' is in contact with and electrically connected to the first lower conductive terminal 213' or the second lower conductive terminal 223. The second row of conductive strips 828' on the second surface 82' of the docking circuit board 800' is in contact with and electrically connected to the first lower contact terminal 212' or the second lower contact terminal 222.

In the second embodiment, the grounding piece 821' on the second surface 82' of the docking circuit board 800' is disposed shorter than the grounding plate 821 in the first embodiment, so that the control signal piece 823' is added in front of the grounding plate 821'. . At the same time, the first lower conductive terminal 213' is added in contact with the control signal piece 823' and turned on. Thus using the same size docking board 800' can deliver more control signals.

The electrical connection method of the second embodiment includes the following steps: (1) providing an electrical connector 100', the electrical connector 100' including a plurality of first terminal modules 21' and a plurality of pairs of second terminal modules 22, The first terminal module 21 ′ includes a first upper terminal 211 ′, a first lower contact terminal 212 ′ and a first lower conductive terminal 213 ′, and each of the second terminal modules 22 includes a second upper terminal 221 , a second contact terminal 222 and a second lower conductive terminal 223; (2) providing a docking circuit board 800' having a first surface 81 and a second surface 82', the first surface 81 of the docking circuit board 800' is provided with A row of conductive sheets, comprising a plurality of grounding strips 811 and a plurality of pairs of differential signal sheets 812 for transmitting differential signals, the second surface 82' of the mating circuit board 800' is provided with a second row of conductive sheets 828' and a third row of conductive The sheet 827', the second row of conductive sheets 828' includes a plurality of grounding strips 821' and a plurality of pairs of differential signal sheets 822' disposed between adjacent grounding strips 821', The three rows of conductive sheets 827' are low frequency signal sheets; (3) the docking circuit board 800' is docked with the electrical connector 100 such that the first lower conductive terminal 213' and the second lower conductive terminal 223 are electrically connected to the third row, respectively. The sheet 827' is in contact to transmit a low frequency signal; (4) the first upper terminal 211' is brought into contact with the grounding strip 811 to transmit a ground signal, and the second upper terminal 221 is in contact with the differential signal sheet 812 to transmit a differential signal; (5) The lower contact terminal 212' is in contact with the grounding strip 821' to transmit a ground signal, and the plurality of second lower contact terminals 222 are in contact with the plurality of pairs of differential signal sheets 822' to transmit a differential signal. The low frequency signal piece in the third row of conductive sheets 827' in the present embodiment includes a control signal piece 823', a power supply piece 825', and a grounding piece 826'.

The tenth and eleventh views disclose the structure of the first terminal module 21'' in the third embodiment. The first upper terminal 211'', the first lower contact terminal 212'', and the first lower conductive terminal 213'' of the first terminal module 21'' in the third embodiment are integrally connected by injection molding. The first upper mounting portion 2112 ′ of the first upper terminal 211 ′′ of the first terminal module 21 ′′ in the third embodiment, the first lower mounting portion 2122 ′′ of the first lower contact terminal 212 ′′ The first lower mounting leg 2132" of the first lower conductive terminal 213" is disposed to extend horizontally to be soldered to the mother circuit board 900 by surface mounting techniques.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above 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.

221‧‧‧Second upper terminal

2211‧‧‧Second Upper Contact

2212‧‧‧Second upper installation department

2213‧‧‧Second upper connection

222‧‧‧Second lower contact terminal

2221‧‧‧Second lower contact

2222‧‧‧Second installation department

2223‧‧‧Second lower connection

223‧‧‧Second lower conductive terminal

2231‧‧‧Second lower conductive part

2232‧‧‧Second installation foot

2233‧‧‧Second lower connection

224‧‧‧second slot

800‧‧‧ docking board

Claims (10)

An electrical connector includes: a first set of terminals including a first upper terminal and a first lower contact terminal forming a first slot therebetween; and a first insulating sheet holding the first upper terminal and the first lower contact terminal, The first upper terminal is provided with a first upper contact portion located above the first slot and transmitting a ground signal, and the first lower contact terminal is provided with a first lower contact portion under the first slot and transmitting a ground signal And a pair of second set of terminals, each of the second set of terminals including a second upper terminal and a second lower contact terminal, a second lower conductive terminal, and a second lower contact terminal and a second lower contact terminal And a second insulating sheet of the second lower conductive terminal, wherein the pair of second upper terminals are provided with a pair of second upper contact portions located above the second slot and transmitting differential signal pairs, the pair of second lower contacts The terminal is provided with a pair of second lower contact portions under the second slot and transmitting differential signal pairs, and each of the second lower conductive terminals is disposed under the second slot and aligned with the second lower contact portion in the mating direction a second lower conductive portion that transmits a low frequency signal Wherein the first terminal and the second pair of terminals arranged in the same row, the first contact terminal and the pair of second contact terminals arranged in the same row. The electrical connector of claim 1, wherein the first set of terminals further comprises a first lower conductive terminal, and the first lower conductive terminal is provided with a first lower slot and transmitting the low frequency signal The conductive portion is next, and the first lower conductive portion and the first lower contact portion are aligned in the mating direction. The electrical connector of claim 2, wherein the electrical connector further comprises an insulative housing having an opening, a first upper terminal, a first lower contact terminal, and a first lower conductive of the first set of terminals The terminal is connected to the first terminal module by injection molding, and the second upper terminal, the second lower contact terminal and the second lower conductive terminal of the second group of terminals are injection molded The first and second terminal modules are supported on the insulative housing and the first and second slots are aligned with the opening. The electrical connector of claim 3, wherein the low frequency signal is a control signal or a power signal or a ground signal. The electrical connector of claim 4, wherein the first lower contact portion of the first terminal module is closer to the opening than the first upper contact portion, and the first lower conductive portion is An upper contact portion is further away from the opening; a second lower contact portion of the second terminal module is closer to the opening than a second upper contact portion, and the second lower conductive portion is more than the second upper contact portion Keep away from the opening. An electrical connection method comprising the steps of: (1) providing an electrical connector, the electrical connector comprising a first set of terminals and a pair of second sets of terminals, the first set of terminals comprising a first upper terminal, a contact terminal and a first insulating sheet holding the first upper terminal and the first lower contact terminal, the second group of terminals including a second upper terminal, a second lower contact terminal, a second lower conductive terminal, and a second holding a second insulating sheet of the upper terminal, the second lower contact terminal and the second lower conductive terminal, wherein the first upper terminal and the pair of second upper terminals are arranged in the same row, and the first lower contact terminal is in contact with the pair of second lower contacts The terminals are arranged in the same row; (2) providing a docking circuit board having upper and lower surfaces, the upper surface of the docking circuit board is provided with a first row of conductive sheets, including an upper grounding strip and a pair of upper differential signal sheets, The lower surface of the docking circuit board is provided with a second row of conductive sheets, which includes a lower grounding strip and a pair of differential signal sheets. The lower surface of the docking circuit board is further provided with two pairs of differential signal sheets aligned in the mating direction. Lower low frequency signal slice; (3) pair The circuit board is docked with the electrical connector such that a pair of second lower conductive terminals are in contact with the two lower low frequency signal sheets to transmit a low frequency signal; (4) causing the first upper terminal to contact the upper ground plane to transmit a ground signal while a pair of second upper terminals are in contact with a pair of upper differential signal sheets to transmit differential signals; (5) causing the first lower contact terminal to be in contact with the lower ground plate to transmit a ground signal while the pair of second lower contact terminals are in contact with a pair of differential signal sheets to transmit a differential signal. The electrical connection method of claim 6, wherein in the step (1), a first lower conductive terminal is added to the first group of terminals, and the second surface of the docking circuit board is in the step (2) A lower low frequency signal piece aligned with the grounding piece along the mating direction is added, and in the step (3), the first lower conductive terminal is brought into contact with the lower low frequency signal piece to transmit a low frequency signal. The electrical connection method of claim 7, wherein the docking circuit board provided in the step (2) has a docking end that is docked with the electrical connector, and the lower low frequency signal sheet configured in the step (2) is configured. And a third row of conductive sheets on the second surface of the docking circuit board, the third row of conductive sheets being closer to the butting end than the second row of conductive sheets. The electrical connection method of claim 8, wherein each of the second row of conductive sheets disposed in the step (2) and the corresponding lower low frequency signal sheet of the third row of conductive sheets are respectively In the butting direction alignment, each of the conductive sheets in the second row of conductive sheets partially overlaps with each of the first conductive sheets in the first row of the first surface. The electrical connection method according to claim 9, wherein the lower low frequency signal piece provided in the step (2) is a control signal piece for transmitting a control signal or a power supply piece for transmitting a power supply signal or a grounding piece for transmitting a ground signal. .