TWM518430U - Network interface circuit and network connector using the same - Google Patents

Abstract

A network interface circuit includes a cable side, a chip side, and a plurality of transmitting channels disposed between the cable side and the chip side. Each transmitting channel includes a common mode choke, an autotransformer, and a capacitor. The common mode choke electrically connects with the autotransformer. The autotransformer has a center tap directly connecting to ground. A network connector using the network interface circuit is also published.

Description

Network interface circuit and network connector module using the same

The present invention relates to a network interface circuit and a network connector module using the same, and more particularly to a network interface circuit and a filter circuit of a network connector module using the circuit.

For a prior art related to this creation, please refer to the TW201320482A patent application published on May 16, 2013, which discloses a network interface circuit having a cable side (cable side) and a wafer side ( The physical side), and four sets of signal transmission channels between the network side and the wafer side. Each group of signal transmission channels includes a first signal channel, a second signal channel, a common mode choke connected between the first signal channel and the second signal channel, and an isolation transformer (Isolating Transformer), one end of the isolation transformer and a center tap The wafer side is connected, and the center tap of the other end of the isolation transformer is connected in parallel to the ground by a capacitor connected in parallel by four resistors. The four resistors are connected in parallel with a capacitor in series to design the Bob-Smith circuit. However, when the capacitors are subjected to lightning strikes on the network cable, the Surge will be transmitted from the cable side. The channel is transmitted to the isolation transformer. At this time, the resistance and capacitance connected to the center tap are weak due to the high voltage resistance. When the voltage is often 2KV, it is burnt by the high lightning strike, which causes the high surge to be unable to be connected to the ground. The primary coil passing through the transformer near the network side is coupled to the secondary coil of the transformer near the wafer side, and if it is high, the chip on the main board is likely to burn out.

The prior art TWI 394 321 patent, the TWM 364 260 patent, and the US Pat. No. 8,861,204 B disclose a network connector module to which the above-described network interface circuit can be applied, which may be an RJ45 connector or a network transformer (Lan Transformer).

The technical problem to be solved by the present invention is to provide a network interface circuit with good filtering performance, high lightning protection level and low cost, and a network connector module using the circuit.

In order to provide a network interface circuit with good filtering performance, high lightning protection level and low cost, the author uses the following technical means:

A network interface circuit having a network line side, a chip side, and at least one set of signal transmission channels between the network line side and the chip side, the set of signal transmission channels including a first signal channel, a second signal channel, a common mode choke and an autotransformer connected to the first and second signal channels, and a capacitor connected in series to the first signal channel and the second signal channel, wherein the common mode choke has a series connection in the first Two coils on the two signal channels, the autotransformer includes a first connection end electrically connected to the first signal channel, a second connection end connected to the second signal channel, and a first connection end and a second connection The center tap of the terminal is electrically connected, and the network interface circuit is further provided with a grounding end, and the center tap is directly electrically connected to the ground.

In order to provide a network connector module with good filtering performance, high lightning protection level and low cost, the author uses the following technical means:

A network connector module includes a circuit board, a common mode choke, an autotransformer, and a capacitor, the common mode choke, an autotransformer, and a capacitor are mounted on a circuit board, the circuit board having a wire side for electrically connecting the network cable, a wafer side for electrically connecting the main board chip, and a plurality of conductive paths connected to the network line side and the chip side, and at least one between the network line side and the wafer side a signal transmission channel, the signal transmission channel includes a first signal channel, a second signal channel, a common mode choke connected to the first and second signal channels, and an autotransformer, and is connected in series with the first signal channel and a capacitor on the second signal channel, the common mode choke has two coils respectively connected in series on the first and second signal channels, and the autotransformer includes a first connection end electrically connected to the first signal channel, a second connection end connected to the second signal channel, and a center tap electrically connected to the first connection end and the second connection end, the network connector module further having a ground end, the center tap directly electrically connected To the ground.

Compared with the prior art, the network interface circuit of the present invention is directly connected to the ground through the center tap of the autotransformer, and the high-surge of the lightning strike on the network side can be directly connected to the ground, thereby reducing the resistance and The cost of the capacitive component increases the lightning protection level. In addition, due to the capacitor connected in series between the autotransformer and the common mode choke, some low frequency noise can be filtered out, and the common mode choke can filter the common mode noise. Common mode chokes, capacitors, and autotransformers work together to achieve better electromagnetic compatibility (EMC) performance.

1‧‧‧Network interface circuit

101‧‧‧ cable side

102‧‧‧ wafer side

11‧‧‧Signal transmission channel

111‧‧‧First signal channel

112‧‧‧Second signal channel

113‧‧‧Common mode choke

1131‧‧‧ magnetic core

1132‧‧‧ coil

114‧‧‧Autotransformer

1140‧‧‧ magnetic core

1141‧‧‧First connection

1142‧‧‧second connection

1143‧‧‧Center tap

1144‧‧‧Primary coil

1145‧‧‧secondary coil

115‧‧‧ capacitor

116‧‧‧ Grounding terminal

2‧‧‧Network Connector Module

21‧‧‧ boards

211‧‧‧ cable side

212‧‧‧ wafer side

213‧‧‧Conductor

215‧‧‧ Grounding

22‧‧‧Common mode choke

23‧‧‧Autotransformer

231‧‧‧Round core

232‧‧‧ Winding

2321‧‧‧ thread head

24‧‧‧ capacitor

The first picture is a circuit diagram conforming to the circuit of the authoring network interface.

The second figure is a front view of a network connector module applying the network interface circuit shown in the first figure.

The third figure is a conductive path diagram of the autotransformer connected to the circuit board shown in the second figure.

The fourth figure is a rear view of the network connector module of the network interface circuit shown in the second figure.

Referring to the first figure, a network interface circuit 1 conforming to the present invention has a network side 101, a chip side 102, and at least one set of signal transmission channels connected between the network side 101 and the wafer side 102. 11. The network interface circuit 1 shown in the first figure includes four sets of the same set signal transmission channel 11, which is suitable for a network with a transmission rate of 1000Base-T and above, and the network of the 10/100Base-T only needs two groups. The signal transmission channel of the same setting can be used.

The set of signal transmission channels 11 includes a first signal channel 111, a second signal channel 112, an autotransformer 114 connected in parallel between the first signal channel 111 and the second signal channel 112, a common mode choke 113, and are respectively connected in series Two capacitors 115 on the first signal channel 111 and the second signal channel 112. The autotransformer 114 includes a first connection end 1141 connected to the first signal channel 111, a second connection end 1142 connected to the second signal channel 112, and is electrically connected to the first connection end 1141 and the second connection end 1142. The center tap 1143 is directly electrically connected to the ground end 116.

In the network interface circuit 1 of the present invention, the center tap 1143 of the autotransformer 114 is directly connected to the ground end 116, and the high-surge of the lightning strike on the network side 101 can be directly connected to the ground end 116, thereby reducing the resistance. And the cost of the capacitive component increases the lightning protection level. The lightning protection level of the autotransformer 114 to the line to ground can reach 15KV, and the lightning protection level between the adjacent two lines (Line to Line) can be Up to 6KV, the traditional design of the isolation transformer to the ground (Line to Ground) lightning protection level up to 6KV, and the lightning protection level between the two adjacent lines (Line to Line) up to 2KV. In addition, since the capacitor 115 is connected in series between the autotransformer 114 and the common mode choke 113, the capacitor 115 can filter out some low frequency noise, and the common mode choke 113 can filter common mode noise, common mode turbulence. The ring 113, the capacitor 115, and the autotransformer 114 cooperate to obtain better electromagnetic compatibility (EMC) performance, and the test not only shows that the insertion loss and the return loss performance are greatly improved. And the conduction interference (CE) and the radiation emission (RE) in electromagnetic compatibility have been improved.

The capacitor 115 is connected between the common mode choke coil 113 and the autotransformer 114. The autotransformer 114 is adjacent to the wire side 101, which is adjacent to the wafer side 102. The autotransformer 114 includes a magnetic core 1140 and a primary coil 1144 and a secondary coil 1145 wound on the same magnetic core. The primary coil 1144 and the secondary coil 1145 are electrically connected and formed between the primary coil 1144 and the secondary coil 1145. Center tap 1143. The common mode choke coil 113 includes a magnetic core 1131 and two coupling coils 1132 wound on the same magnetic core, and each coil 1132 is connected in series to the first signal channel 111 and the second signal channel 112, respectively.

Please refer to FIG. 2 to FIG. 4 together, and apply the network connector module 2 of the above network interface circuit 1. The network connector module 2 includes a circuit board 21, a common mode choke 22, and an autotransformer. 23. Also, a capacitor 24, the common mode choke coil 22, the autotransformer 23, and the capacitor 24 are mounted on the circuit board 21. The common mode choke 22 corresponds to the common mode choke 113 in the network interface circuit 1, the autotransformer 23 corresponds to the autotransformer 114, and the capacitor 24 corresponds to the capacitor 115. The circuit board 21 has a network side 211 for electrically connecting the network lines, a wafer side 212 for electrically connecting the main board chips, and a plurality of conductive paths connected between the screen side 211 and the wafer side 212.

The circuit board 21 is provided with a plurality of conductive strips 213. The autotransformer package 23 includes a toroidal core 231 and two conductive windings 232 wound around the toroidal core. The two ends 2321 of each winding 232 are respectively A conductive sheet 213 is physically connected, and portions of the two conductive windings 232 wound around the magnetic core 231 are twisted together, and portions outside the magnetic core 231 are disposed apart. Referring to the third figure, the center tap of the autotransformer 23 is formed by connecting the wire ends 2321 of the two windings 232 through the conductive path 214 on the circuit board 21, and the center tap of the autotransformer 23 is electrically conductive on the circuit board 21. The path 214 is directly electrically connected to the ground 215.

Compared with the traditional isolation transformer, four conductive windings (enamel wires) are required to surround the toroidal core (iron core). The autotransformer 23 of the present invention uses two conductive windings 232, which reduces the number of conductive windings, and Reduced winding and wiring time, improved lightning protection level and electromagnetic compatibility while reducing manufacturing costs. Compared with the traditional isolation transformer, it is required to provide six conductive pads on the circuit board to be connected with the isolation transformer. The autotransformer 23 of the present invention only needs four conductive pads to be connected with the autotransformer 23. , the horizontal of the circuit board 21 The arrangement of the conductive sheets 213 is reduced, so that the width of the circuit board 21 is made smaller. Compared with the surface-welded (SMD) autotransformer of the I-shaped (or strip) core structure, the autotransformer 23 of the toroidal core structure of the present invention has a larger inductance value, thereby eliminating the need for a conventional isolation transformer. At the same time, the inductance value of the autotransformer can meet the filtering requirements.

Referring to the fourth figure, the common mode choke coil 22 includes a strip core and two coupling windings (not shown) wound on the same strip core. The common mode choke 22 is surface welded. Technology (SMT) is soldered to the conductive sheets on the circuit board 21.

The capacitor 24 is a surface-welded capacitor, and the common mode choke coil 22, the autotransformer 23, and the capacitor 24 are electrically connected by a conductive path on the circuit board 21. The autotransformer 23 is mounted on one side of the circuit board 21, and the common mode choke coil 22 and the capacitor 24 are mounted on the other side of the circuit board. The common mode choke 22 and the autotransformer 23 adopt a separate design to facilitate the automatic winding of the common mode choke 22 and the autotransformer 23, and the wire 2321 of the conductive winding 232 on the autotransformer 23 is automatically The spot welder (Wuxi soldering) is automatically hot-melt welded to the conductive sheet 213, and the common mode choke coil 22 and the capacitor 24 are plated onto the circuit board 21 by SMT technology, and the whole process is highly automated and low in manufacturing cost.

The network connector module 2 can be used as a network transformer (Lan Transformer) module, or can be installed as an internal circuit board magnetic group in the RJ45 socket connector. When it is a Lan Transformer module, it is mounted on an external motherboard with a chip and connected to a passive RJ45 connector (passive RJ45) via an external motherboard. The ground terminal 116 is on the external motherboard. Ground layer. When it is part of the RJ45 socket connector, the RJ terminal is mounted on the cable side, and the foot terminal is mounted on the wafer side (Footer Pin), the circuit board is mounted on the insulative housing, and the receptacle connector has a metal shield housing as the ground end 116 connected to the ground terminal 215 on the inner circuit board. The metal mask housing is also electrically connected to the ground plane of the external motherboard.

In summary, this creation has indeed met the requirements of the new patent, and has filed a patent application in accordance with the law. However, the above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and any equivalent modification or change made by a person familiar with the skill of the present invention in accordance with the spirit of the present invention should be It is covered by the following patent application.

1‧‧‧Network interface circuit

101‧‧‧ cable side

102‧‧‧ wafer side

11‧‧‧Signal transmission channel

111‧‧‧First signal channel

112‧‧‧Second signal channel

113‧‧‧Common mode choke

1131‧‧‧ magnetic core

1132‧‧‧ coil

114‧‧‧Autotransformer

1140‧‧‧ magnetic core

1141‧‧‧First connection

1142‧‧‧second connection

1143‧‧‧Center tap

1144‧‧‧Primary coil

1145‧‧‧secondary coil

115‧‧‧ capacitor

116‧‧‧ Grounding terminal

Claims (10)

A network interface circuit having a network line side, a chip side, and at least one set of signal transmission channels between the network line side and the chip side, wherein the group of signal transmission channels includes a first signal channel and a second signal channel a common mode choke coil and an autotransformer connected to the first and second signal channels, and a capacitor connected in series to the first signal channel and the second signal channel, the common mode choke coils being respectively connected in series with the first Two coils on the second signal path, the autotransformer includes a first connection end electrically connected to the first signal channel, a second connection end connected to the second signal channel, and the first connection end and the second connection end The center end of the connection end is electrically connected, and the network interface circuit is further provided with a grounding end, and the center tap is directly electrically connected to the ground end. The network interface circuit of claim 1, wherein the capacitor is electrically connected between the common mode choke and the autotransformer. The network interface circuit of claim 1, wherein the autotransformer is adjacent to the network line side, and the common mode choke coil is adjacent to the wafer side. The network interface circuit of claim 1, wherein the autotransformer comprises a magnetic core and a primary coil and a secondary coil wound on the same magnetic core, the primary coil and the secondary coil being electrically connected and A center tap is formed between the primary coil and the secondary coil. The network interface circuit of claim 1, wherein the two coils of the common mode choke are coupled to the same core. A network connector module includes a circuit board, a common mode choke, an autotransformer, and a capacitor, wherein the common mode choke, an autotransformer, and The capacitors are all mounted on the circuit board, and the circuit board has a network line side for electrically connecting the network lines, a wafer side for electrically connecting the main board chips, and a plurality of conductive paths connected to the network line side and the wafer side. At least one set of signal transmission channels is disposed between the network line side and the chip side, and the set of signal transmission channels includes a first signal channel, a second signal channel, a common mode choke connected to the first and second signal channels, and An autotransformer, and a capacitor connected in series to the first signal channel and the second signal channel, the common mode choke has two coils respectively connected in series on the first and second signal channels, the autotransformer including electrical a first connection end connected to the first signal channel, a second connection end connected to the second signal channel, and a center tap electrically connected to the first connection end and the second connection end, the network connector module further It has a grounding end, and the center tap is directly electrically connected to the grounding end. The network connector module of claim 6, wherein the circuit board is provided with a plurality of conductive sheets, the autotransformer comprising a toroidal core and two conductive windings wound around the toroidal core The two wire ends of each winding are respectively physically connected to a conductive piece, and the center tap of the autotransformer is formed by connecting the wires of the two winding wires through a conductive path on the circuit board. The network connector module of claim 7, wherein the portions of the two conductive windings wound around the magnetic core are twisted together, and the portions outside the magnetic core are disposed apart. The network connector module of claim 7, wherein the common mode choke coil comprises a strip core and a winding wound around the strip core, the common mode choke coil Surface soldering techniques are soldered to the conductive sheets on the board. The network connector module of claim 9, wherein the capacitor is a surface-welded capacitor, the common mode choke, an autotransformer, and an electric The container is electrically connected by a conductive path on the circuit board. The autotransformer is mounted on one side of the circuit board, and the common mode choke coil and the capacitor are mounted on the other side of the circuit board.