CN201266911Y - Filtering circuit and electric connector with the circuit - Google Patents

Abstract

A filter circuit includes four transmission channels, each transmission channel respectively includes an isolation transformer and a common mode choke coil, and the common mode choke coils of each transmission channel are wound together on a magnetic core. An electrical connector using the filter circuit above includes an insulating body, conductive terminals mounted on the insulating body, and a signal processing module electrically connected to the conductive terminals. The module includes the above filter circuit. The filter circuit and the circuit electrical connector using the interface can reduce the usage of magnetic cores and the workload of manual winding during manufacture, thereby improving production efficiency and reducing product costs.

Description

Filter circuit and electrical connector with the circuit

【Technical field】

The utility model relates to a filter circuit and an electric connector with the filter circuit, in particular to a filter circuit applied to a network and an electric connector with the filter circuit applied to the network.

【technical background】

With the continuous development of communication technology and the continuous improvement of data transmission speed, stricter requirements are put forward for the comprehensive electrical performance of electrical connectors.

For patent information related to this case, please refer to Taiwan Patent No. 528221 published on April 11, 2003, which discloses an electrical connector for 10/100/1000 Base-T networks, which includes a base 1. The base covering the seat body and the electrical device inside the seat, the electrical device includes a circuit board and several filter modules welded on the circuit board. When this electrical connector is applied to a 10/100 Base-T network, the filter module includes two isolation transformers, two common mode choke coils and an autotransformer. Coil on core. When the connector is applied to a 1000Base-T network, the filter module includes four isolation transformers and four common mode choke coils, and the eight inductance components respectively include a magnetic core and a coil wound on the magnetic core.

However, the filter module disclosed in Taiwan Patent No. 528221 and the electrical connector using the filter module need to use a large number of inductance components, occupy a lot of space in the connector, and these components need to be wound by hand, so that Product material cost and production cost are higher. Therefore, it is necessary to design a filter circuit that can overcome the above disadvantages and an electrical connector using the filter circuit.

【Content of utility model】

The purpose of the utility model is to provide a filter circuit with small volume, convenient production and low cost and an electrical connector using the filter circuit.

In order to provide a filter circuit with small volume, convenient production and low cost, the utility model adopts the following technical solution: a filter circuit, used to connect the first side line and the second side line, the filter circuit includes several transmission channels, each The transmission channels all include a transformer and a common mode choke coil, one side of the transformer of each transmission channel is connected to the first line, the other side of the transformer is connected to the second line through the common mode choke coil, and each transmission channel The common mode chokes are wound to the same core.

In order to provide an electrical connector with convenient production and low cost, the utility model adopts the following technical scheme: an electrical connector, including an insulating body, a butt terminal for connecting with a pair of butt connectors, and a butt terminal for connecting the electrical connector Connected to a pin terminal of a motherboard, a signal processing module connected to the docking terminal and the pin terminal, the signal processing module includes four transmission channels, each transmission channel includes a transformer and a common mode choke coil, and the four transmission channels The common mode chokes of the channels are wound to the same core.

Compared with the prior art, all the common mode choke coils in the filter circuit of the present invention are wound on the same magnetic core, which reduces the volume of the signal processing module, reduces the cost of raw materials and also reduces the manual winding operation process , thus reducing product cost.

【Description of drawings】

Fig. 1 is a circuit diagram of a filter circuit according to the present invention.

FIG. 2 is an electrical test diagram of the filter circuit shown in FIG. 1 .

Fig. 3 is a perspective view of the electrical connector of the present invention.

FIG. 4 is an exploded perspective view of the electrical connector shown in FIG. 3 .

FIG. 5 is another perspective exploded view of the electrical connector shown in FIG. 3 .

FIG. 6 is an exploded perspective view of a signal processing module of the electrical connector shown in FIG. 3 .

FIG. 7 is an exploded perspective view of the signal processing module of the electrical connector shown in FIG. 3 from another angle.

【Detailed ways】

Please refer to Fig. 1, a filter circuit 1 according to the present invention is a data network interface circuit for connecting the circuit board end 101 and the cable end 102, the filter circuit includes a first channel 11, a second channel 12. The third channel 21 and the fourth channel 22 .

The first channel 11 includes a first isolation transformer 111 and a first common mode choke coil 112 . The first isolation transformer 111 includes a primary coil 113 and a secondary coil 115. The primary coil 113 has two connection terminals 113a, 113b and a center tap 113c. The secondary coil 115 has two connection terminals 115a, 115b and a center tap 115c. The two connection ends 115a, 115b of the secondary coil 115 are connected to the cable end 102, and the center tap 115c of the secondary coil 115 is connected in series with a 75 ohm resistor 13 and a capacitor 15 and grounded. The first common mode choke coil 112 includes two coils 112a, 112b, one side of the two coils 112a, 112b is connected to the circuit board terminal 101, and the other side is connected to the two connection terminals 113a of the primary coil 113 of the first isolation transformer 111 , 113b,. The center tap of the primary coil 113 is connected in series with four parallel capacitors 14 and grounded.

The second channel 12 includes a second isolation transformer 121 and a second common mode choke coil 122 . The second isolation transformer 121 includes a primary coil 123 and a secondary coil 125. The primary coil 123 has two connecting ends 123a, 123b and a middle tap 123c. The secondary coil 125 has two connecting ends 125a, 125b and a middle tap 125c. The two connection ends 125a, 125b of the coil 125 are connected to the cable end 102, and the center tap 125c of the secondary coil 125 is connected in series with a 75 ohm resistor 13 and a capacitor 15 and grounded. The second common mode choke coil 122 includes two coils 122a, 122b, one side of the two coils 122a, 122b is connected to the circuit board terminal 101, and the other side is connected to the two connection terminals 123a of the primary coil 123 of the second isolation transformer 121 , 123b, and the center tap 123c of the primary coil 123 is connected to the center tap 113c of the primary coil 113 of the first isolation transformer 111 . The common mode choke coil 112 of the first channel 11 and the second common mode choke coil 122 are wound on the same magnetic core.

The structure of the third channel 21 and the fourth channel 22 is the same as that of the second channel 12 . The center tap 213c of the first coil 213 of the isolation transformer 211 of the third channel 21 is connected to the center tap 113c of the primary coil 113 of the first isolation transformer 111, and the center tap 223c of the first coil 223 of the isolation transformer 221 of the fourth channel 22 is also connected Connected to the center tap 113c of the primary winding 113 of the first isolation transformer 111. The common mode choke coils 212 and 222 of the third channel 21 and the fourth channel 22 are wound on the same magnetic core as the first common mode choke coil 112 and the second common mode choke coil 122 .

Please refer to FIG. 2 , which is an electrical test diagram of the filter circuit 1 shown in FIG. 1 , which mainly shows the return loss (Return Loss) of the filter circuit 1 when it is applied to different impedance loads. The abscissa in the figure is the frequency value, ranging from 0 to 100 megahertz (MHz), and the ordinate is the return loss measured by the filter circuit 1, ranging from 0 to 35 decibels (dB). In the figure, Ls is the industry standard value of 1000 Base-T, L1 is the return loss when the cable end 102 of the filter circuit 1 is connected to a 100-ohm load, and L2 is the echo when the cable end 102 of the filter circuit 1 is connected to an 85-ohm load Loss, L3 is the return loss when the cable end 102 of the filter circuit 1 is connected to a 115 ohm load. It can be seen from the figure that L1, L2, and L3 are all above the standard value Ls, that is, the filter circuit 1 is receiving 85~ Loads in the range of 115 ohms can meet industry requirements.

Please refer to Fig. 3 to Fig. 5, which is an electrical connector 3 that is applied to a data transmission network and has the above filter circuit 1, the electrical connector 3 is a network electrical connector (Modular Jack) and a USB stacking connector, and its It includes a front shielding case 4 , a rear shielding case 5 , an insulating body 6 , two USB terminal groups 7 , two LED indicating devices 8 and a terminal module 9 .

The insulating main body 6 includes a network interface 61 , two USB interfaces 62 and two LED indicating device accommodating spaces 63 located on both sides of the upper end. Two USB terminal groups 7 are respectively mounted to two USB interfaces 62, two LED indicator devices 8 are respectively mounted to two LED storage spaces 63, terminal modules 9 are mounted to the rear of the insulating body 6, and there are docking terminals 91 Extends to network interface 61. The front shielding shell 4 and the rear shielding shell 5 are installed on the insulating body 6 respectively, and are fastened with each other to completely shield the insulating body 6 to prevent external interference sources from affecting the transmission line in the insulating body.

Please refer to Figures 6 to 7, the terminal module 9 includes a docking terminal 91, a circuit board 92, a bead-type magnetic element 93 welded on the circuit board 92, a terminal base 94 and pins fixed on the terminal base 94 Terminal 95. Wherein, the circuit board 92 together with the magnetic element 93 constitutes a signal processing module, that is, the filter circuit 1 above. The magnetic element 93 includes a first magnetic core 931, a second magnetic core 932, a third magnetic core 933, a fourth magnetic core 934 and a fifth magnetic core 935, and a first group of coils 936, a second The first group of coils 937, the third group of coils 938, and the fourth group of coils 939. The first magnetic core 931 and the first group of coils 936 correspond to the first isolation transformer 111 in the middle of the filter circuit 1, the second magnetic core 932 and the second group of coils 937 correspond to the second isolation transformer 121, the third magnetic core 932 and the first The three groups of coils 938 correspond to the third isolation transformer 211 , and the fourth magnetic core 934 and the fourth group of coils 939 correspond to the fourth isolation transformer 221 . The fifth magnetic core 935 is a cylindrical magnetic core and has two through holes on the magnetic core, and a part of the first group to the fourth group of coils 936-939 are wound together to the two through holes of the fifth magnetic core 935 to form Common mode choke coils 112 , 122 , 212 , 222 in filter circuit 1 . Five capacitors 96 are welded on one side of the circuit board, and these capacitors 96 correspond to the capacitors 14 and 15 of the filter circuit 1 respectively. Two sides of the circuit board 92 are respectively provided with a plurality of soldering pins 921 , 922 , and the first group of coils 936 to the fourth group of coils 939 are respectively soldered to the soldering pins 921 .

The docking terminal 91 includes a docking portion 911 and a welding portion 912. The docking portion 911 extends into the network interface 61 after the terminal module 9 is installed on the insulating body 3, and the soldering portion 912 is soldered to the soldering foot 922 of the circuit board 92, so that The docking terminal 91 is connected to the cable end 102 of the filter circuit 1 .

The pin terminal 95 is fixed on the terminal base 94, wherein one end of the pin terminal 95 extends through the through hole provided at the bottom of the circuit board 92 and is welded, and the other end of the pin terminal 95 then extends to the bottom of the terminal base 94 to electrically connect The device 3 is electrically connected to a mounting circuit board (not shown). The pin terminals 95 include ten first pin terminals 951 and four second pin terminals 952 . The first pin terminals 951 are correspondingly connected to the circuit board end 101 of the filter circuit 1 .

The pins (not marked) of the two LED indicator devices also pass through and are soldered to the through holes (not marked) provided on the upper end of the circuit board 92, and by means of the conductive path on the circuit board 92 and the second lead welded to the circuit board. The pin terminals are connected to a mounting circuit board (not shown).

The signal processing module of the electrical connector 3 uses a total of five magnetic cores, which greatly reduces the use of magnetic cores compared to the traditional electrical connector using eight magnetic cores, and also reduces the volume of the filter circuit 1. At the same time, in view of the current magnetic bead type The inductance components are mostly wound by hand, and the filter circuit 1 only needs to be wound five times. Compared with winding eight magnetic cores separately, the workload of manual winding can be greatly reduced, thereby improving production efficiency and reducing production costs.

Claims (7)

1. A filter circuit for connecting the first-side line and the second-side line, which includes a plurality of transmission channels, each transmission channel includes a transformer and a common mode choke coil, and one side of the transformer of each transmission channel is connected to The first line, the other side of the transformer is connected to the second line through the common mode choke coil, and the feature is that: the common mode choke coils of the transmission channels are wound to the same magnetic core. 2. The filter circuit according to claim 1, characterized in that: the filter circuit comprises four transmission channels, and the transformer of each channel has a magnetic core. 3. The filter circuit according to claim 1, wherein the magnetic core shared by the common mode choke coils is a double-hole cylindrical magnetic core. 4. The filter circuit according to claim 1, wherein the transformers of the transmission channels include a first coil and a second coil, the second coil is connected to the common mode choke coil, and the first coil is connected to the common mode choke coil. to the first side line, and the first coil has a center tap that is grounded. 5. An electrical connector, which includes an insulating body, a butt terminal for connecting with a butt connector, a pin terminal for connecting the electrical connector to a motherboard, a signal connecting the butt terminal and the pin terminal A processing module, the signal processing module includes four transmission channels, and each transmission channel includes a transformer and a common mode choke coil, wherein the common mode choke coils of the four transmission channels are wound to the same magnetic core. 6. The electrical connector according to claim 5, wherein the electrical connector uses a total of 5 magnetic cores. 7. The electrical connector as claimed in claim 5, wherein the magnetic core is cylindrical and has two through holes.

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