TW202013886A - Pulse filter to greatly reduce the transmission loss and waveform distortion between the network connector and the network integrated circuit, and effectively increase the transmission distance - Google Patents

Abstract

The present invention discloses a pulse filter, including four first magnetic rings, four first toroidal coils, four second magnetic rings, four second toroidal coils, four second middle-tap connecting wires, four third magnetic rings, four third toroidal coils, four third middle-tap connecting wires, and the glue and housing that house the above components and provide isolation protection, which are used to connect the RJ45 connector to the network integrated circuit and provide pulse filtering. In particular, the first, second, and third toroidal coils wound on the first, second, and third magnetic rings cooperatively are used as the transformers, input impedances, and output impedances, respectively. Furthermore, the input impedance and output impedance are specially designed to have impedance matching, which can greatly reduce the transmission loss and waveform distortion between the network connector and the network integrated circuit, and effectively increase the transmission distance.

Description

Pulse filter

The invention relates to a pulse filter, in particular, the first magnetic ring, the second magnetic ring, and the third magnetic ring are matched with the wound first ring coil, second ring coil, and third ring coil, respectively. It is used as a transformer, input impedance, and output impedance, and is specially designed so that the input impedance and output impedance are impedance matching, which can greatly reduce the transmission loss and waveform distortion between the network connector and the network integrated circuit, and effectively increase the transmission distance. It is very suitable for the RJ45 connector of 10G-BASE-T Ethernet communication network or 10G BASE-T network interface operating at 10Gbps transmission speed.

Ethernet is a very commonly used network, and it is well known that PoE power supply is a technology that can transmit power and data to devices through twisted pairs in Ethernet, and is also commonly referred to as RJ45. 8P8C connector is a commonly used twisted pair connection plug in Ethernet, where 8P of 8P8C (8 position 8 contact) refers to 8 positions (Position, that is, 8 grooves), and 8C refers to 8 Contact (Contact, that is, 8 metal contacts).

Taking 100 Base-T4 as an example, the RJ45 connector contains four sets of differential signal pairs, namely TD1+ pin (transmit data+), TD1-pin (transmit data-), TD2+ pin, TD2-pin, TD3+ Pin, TD3-pin, TD4+ pin, TD4-pin.

In addition, Fast Ethernet and 10/100M Ethernet only use four wires and use differential signal transmission to reduce electromagnetic interference. Two TX wires are twisted together, and two RX receiving wires are also Screw together. Therefore, parallel wires are EIA-568-A or EIA-568-B at both ends, and jumpers are EIA-568-A at one end and EIA-568-B at the other end.

In addition, in Gigabit Ethernet (Gigabit Ethernet, 1000M Ethernet) or Power over Ethernet (PoE, Power over Ethernet), all four pairs of differential pairs will be used.

For example, as shown in the first and second figures, the conventional RJ45 connector SK generally uses two magnetic rings accommodated in a housing 10 with multiple pins 11 as network filtering The devices are the first main magnetic ring 20 and the second magnetic ring 30, respectively, which are connected to the network integrated circuit IC to provide an isolated differential signal transmission function. Further, the first magnetic ring 20 is mainly used as a transformer, and the differential signal ratio is 1:1, used for differential signal transmission, and has the functions of impedance matching, waveform repair, signal clutter suppression and voltage isolation, etc., which can be increased The transmission distance, at the same time, can also keep the connected network integrated circuit IC from the outside, further enhancing the anti-interference ability. In addition, the function of the second magnetic ring 30 is to act as the input impedance Rin, and it is obvious that the conventional technology only has the input impedance Rin, but the output impedance is not configured. Therefore, the input impedance and output impedance of the entire transmission interface are not Matching causes the transmission current I to become larger, increases the transmission power, seriously affects the actual transmission distance, and greatly limits the application field.

In addition, although the input impedance Rin provided by the second magnetic ring 30 can effectively filter the common mode noise of the RJ45 connector SK, the high frequency noise generated in the network integrated circuit IC will be filtered due to the lack of high impedance Common mode noise causes waveform distortion and seriously affects signal transmission quality.

Refer to the third figure for the implementation method of general conventional technology, which is a well-known technology, so it will not be described in further detail.

Therefore, there is a great need for an innovative pulse filter, including three toroidal coils, which are used as input impedance, transformer, and output impedance, all built into the insulating shell, and specially designed so that the input impedance and output impedance are matched to each other. The transmission loss of the overall line is reduced to very low, and the transmission distance is effectively increased, thereby solving all the problems of the above-mentioned conventional technologies.

The main object of the present invention is to provide a pulse filter, including four first magnetic rings, four first toroidal coils, four second toroidal coils, four second toroidal coils, four second center tap connecting wires, and four third magnetic Ring, four third toroidal coils, four third center tap connecting wires, and glue and housing that house the above components and provide isolation protection, can connect the RJ45 connector SK to the network integrated circuit IC, and has a pulse Filtering effect.

Specifically, each first toroidal coil is wound around the corresponding first magnetic ring to form a transformer, and each second toroidal coil is wound around the corresponding second magnetic ring to form an input impedance, and Each third loop coil is wound around the corresponding third magnetic loop to form an output impedance.

The casing has a plurality of pins and is connected to the second loop coils and the third loop coils. Furthermore, each second center-tap connecting line is connected to the corresponding pin by the center-tap on the side of the first loop coil, and each third center-tap connecting line is connected by the other of the first loop coil The middle tap on one side is connected to the corresponding pin.

In particular, the corresponding second toroidal coil, first toroidal coil and third toroidal coil are connected in sequence, and the network connector is connected to the network integrated circuit through the pins.

Overall, the present invention uses the first, second, and third magnetic coils to wind the first toroidal coil, the second toroidal coil, and the third toroidal coil as the transformer, input impedance, and output impedance, respectively, and It is specially designed that the input impedance and output impedance are impedance matching, which can greatly reduce the transmission loss and waveform distortion between the network connector and the network integrated circuit, and effectively increase the transmission distance.

The embodiments of the present invention will be described in more detail below with reference to icons and component symbols, so that those skilled in the art can implement them after studying this specification.

Please refer to the fourth and fifth diagrams, which are a schematic diagram and a circuit schematic diagram of a pulse filter according to a first embodiment of the present invention. As shown in the fourth and fifth figures, the pulse filter of the first embodiment of the present invention includes a housing 10, four first magnetic rings 20, four first toroidal coils 22, four second magnetic rings 30, four Two toroidal coils 32, four second center tapping wires 34, four third magnetic rings 40, four third toroidal coils 42 and four third middle tapping wires 44 for connecting the RJ45 connector SK to the network body The circuit IC has a pulse filtering function, in which all the first magnetic ring 20, the first ring coil 22, the second magnetic ring 30, the second ring coil 32, the second center tap connecting line 34, the third magnetic ring 40, Both the third loop coil 42 and the third center-tap connecting wire 44 are accommodated in the housing 10 together.

Preferably, the first magnetic ring 20, the second magnetic ring 30, and the third magnetic ring 40 are iron core magnetic rings, and the first toroidal coil 22, the second toroidal coil 32, the second center tap connecting line 34, the first The three loop coils 42 and the third center-tap connecting wire 44 are two-phase twisted enameled wires.

Each first loop coil 22 is wound around the corresponding first magnetic ring 20, each second loop coil 32 is wound around the corresponding second magnetic ring 30, and each third loop coil 42 is It is wound around the corresponding third magnetic ring 40 and thus constitutes four groups of pulse filter units. In addition, the housing 10 has a plurality of pins 11 for connecting the first loop coil 32, the second center tap connection line 34, the third loop coil 42 and the third center tap connection line 44.

Overall, the pulse filter of the first embodiment of the present invention is disposed between the RJ45 connector SK and the network integrated circuit IC, and connects the RJ45 connector SK and the network integrated circuit IC through the pins 11 In order to provide pulse filtering function, it can reduce the transmission loss of the overall line and effectively increase the transmission distance.

Specifically, each first loop coil 22 is wound around the corresponding first magnetic ring 20 to form a transformer, and each second loop coil 32 is wound around the corresponding second magnetic ring 30 to form The input impedance, and each third loop coil 42 is wound around the corresponding third magnetic ring 40 to form the output impedance, so the present invention can use these pins 11 to connect the electrical signal from the RJ45 connector SK according to The sequence is bidirectionally transmitted to the network integrated circuit IC through the input impedance, transformer, and output impedance.

Further, the RJ45 connector SK mentioned in the present invention includes four sets of differential signal pair pins (that is, TD1+ pin, TD1- pin, TD2+ pin, TD2- pin, TD3+ pin, TD3- Pin, TD4+ pin, TD4-pin), it also includes TCT1 pin, TCT2 pin, TCT3 pin, TCT4 pin, which are respectively configured on each group of differential signal pair pins, as shown on the left side of the fourth figure As shown. In addition, the right side of the fourth picture shows the MCT1 pin, MX1-pin, MX1-pin, MCT2 pin, MX2-pin, MX2-pin, MCT3 pin, MX3 of the network integrated circuit IC -Pin, MX3-pin, MCT4 pin, MX4-pin, MX4-pin, respectively corresponding to the TCT1 pin, TD1+ pin, TD1-pin, TCT2 pin, TD2+ pin of the RJ45 connector SK Pin, TD2-pin, TCT3 pin, TD3+ pin, TD3-pin, TCT4 pin, TD4+ pin, TD4-pin.

More specifically, the second loop coil 32 is further connected between the RJ45 connector SK and the first loop coil 22, and the third loop coil 42 is further connected to the first loop coil 22 and the network integrated circuit Between IC. Furthermore, the second loop coil 32 is connected to the side of the first loop coil 22 (the left side in the figure), and the third loop coil 42 is connected to the other side of the first loop coil 22 (the right side in the figure) Side), in particular, the TCT1 pin, TCT2 pin, TCT3 pin, TCT4 pin are connected to the center tap of the left side of the first loop coil 22, that is, the second center tap connecting line 34, and pass through the first The second magnetic ring 30, and the MCT1 pin, MCT2 pin, MCT3 pin, and MCT4 pin are connected to the center tap of the right side of the first loop coil 22, that is, the third center tap connecting line 44 and pass through Third magnetic ring 40.

Essentially, the second loop coil 32 and the third loop coil 42 are regarded as the input impedance Rin and the input impedance Rout, respectively, in terms of circuit characteristics, as shown in the simple equivalent circuit of the sixth diagram. Since the second toroidal coil 32 and the third toroidal coil 42 are specially designed such that the input impedance Rin and the input impedance Rout are matched to each other, such as 50Ω, the conduction current I flowing through the pulse filter of the present invention can be greatly reduced to approach Zero current, to achieve the purpose of reducing power consumption, thereby increasing the effective transmittable distance.

Since the second middle-tap connecting wires 34 are connected from the TCT1 pin, TCT2 pin, TCT3 pin, and TCT4 pin to the middle tap of the left side of the first loop coil 22 and pass through the second magnetic ring 30, Moreover, the third middle-tap connecting wires 44 are connected from the MCT1 pin, MCT2 pin, MCT3 pin, and MCT4 pin to the middle tap of the right side of the first loop coil 22 and pass around the third magnetic ring 40, Therefore, the second magnetic ring 30 and the third magnetic ring 40 have the function of a choke coil, which can effectively filter high-frequency noise and further improve the signal transmission quality.

To further understand the characteristics of the present invention, reference can be made to the seventh figure, the detailed equivalent circuit of the pulse filter of the first embodiment of the present invention, and compared with the third figure, and it is obvious that the present invention also has input impedance And the output impedance, but the conventional technology is only the input impedance.

Further referring to the seventh and eighth figures at the same time, a schematic diagram and a circuit schematic diagram of a pulse filter according to a second embodiment of the present invention. It should be noted that the pulse filter of the second embodiment of the present invention is similar to the first embodiment of the present invention and has the same components, including a housing 10 and four sets of first magnetic rings 20 and first toroidal coils 22. The second magnetic ring 30, the second toroidal coil 32, the third toroidal coil 40, and the third toroidal coil 43, and the technical difference therebetween lies in the middle of the left side of the first toroidal coil 22 in the second embodiment The second middle-tap connecting wires 34, which are connected to the TCT1 pin, TCT2 pin, TCT3 pin, and TCT4 pin, are designed to be bypassed without passing through the second magnetic ring 30. Similarly, the first ring The third center tap connecting line 44 of the center tap of the right side of the shaped coil 22 connected to the MCT1 pin, MCT2 pin, MCT3 pin, MCT4 pin is designed to be bypassed without passing through the third magnetic ring 40 . Therefore, the pulse filter of the second embodiment does not provide a choke effect on the transmission signal.

In summary, the present invention is characterized by using three toroidal coils as input impedance, transformer, and output impedance, respectively, and built-in insulation housing for isolation protection, not only the input impedance can effectively filter the common mode from the RJ45 connector Noise, the output impedance can also be used to filter high-frequency noise generated from the network IC to prevent waveform distortion, and the input impedance and output impedance are specially designed to match the impedance, so the transmission loss of the overall line is reduced to very low. Effectively achieve the functions of signal transmission, waveform repair, signal clutter suppression and voltage isolation, etc., thereby increasing the transmission distance, while isolating the chip from the outside and enhancing the anti-interference ability.

The above are only for explaining the preferred embodiments of the present invention, and are not intended to limit the present invention in any form, so that any modifications or changes made to the present invention under the same spirit of the invention , Should still be included in the scope of protection of the present invention.

10: Case 11: Pin 20: First magnetic ring 22: First toroidal coil 30: Second toroidal ring 32: Second toroidal coil 34: Second center tap connection line 40: Third toroidal ring 42: No. Three toroidal coils 44: third center tap connection line I: conducted current IC: network integrated circuit Rin: input impedance Rout: output impedance SK: network connector

The first figure shows a schematic diagram of a network filter in conventional technology. The second figure shows a simple equivalent circuit diagram of the network filter in the conventional technology. The third figure shows the detailed equivalent circuit of the network filter in the conventional technology. The fourth figure shows a schematic diagram of the pulse filter according to the first embodiment of the present invention. The fifth figure shows a schematic circuit diagram of the pulse filter according to the first embodiment of the present invention. The sixth figure shows a simple equivalent circuit diagram of the pulse filter according to the first embodiment of the present invention. The seventh figure shows the detailed equivalent circuit of the pulse filter according to the first embodiment of the present invention. Figure 8 shows a schematic diagram of a pulse filter according to a second embodiment of the invention. The ninth figure shows a schematic circuit diagram of a pulse filter according to a second embodiment of the invention.

10: Shell

11: Pin

20: The first magnetic ring

22: First toroidal coil

30: Second magnetic ring

32: Second toroidal coil

34: Second center tap connecting cable

40: Third magnetic ring

42: Third toroidal coil

44: Third center tap connecting cable

IC: network integrated circuit

SK: network connector

Claims (7)

A pulse filter is used to connect a network connector to a network integrated circuit to provide a pulse filtering function, including: four first magnetic loops; four first loop coils, and each of the first loops Four coils are wound around the corresponding first magnetic ring to form a transformer; four second magnetic rings; four second toroidal coils, and each second toroidal coil is wound around the corresponding second magnetic ring The ring forms an input impedance; four third magnetic rings; four third ring coils, and each third ring coil is wound around the corresponding third magnetic ring to form an output impedance; four second middle taps Connecting wires; four third-tap connecting wires; and a housing for accommodating the first magnetic rings, the first toroidal coils, the second magnetic rings, the second toroidal coils, The third magnetic rings and the third toroidal coils have a plurality of pins connected to the second toroidal coils and the third toroidal coils, wherein each of the second center-tap connecting wires is formed by the A middle tap on one side of the first loop coil is connected to the corresponding pin, and each third middle tap connection line is connected by a middle tap on the other side of the first loop coil To the corresponding pin, the corresponding second toroidal coil, the first toroidal coil and the third toroidal coil are connected in sequence, and the network connector is connected to the via the pins Network integrated circuit. According to the pulse filter described in item 1 of the patent application scope, wherein the network connector is an RJ45 connector and includes a TCT1 pin, a TD1+ pin, a TD1-pin, a TCT2 pin, a TD2+ pin, a TD2- pin, a TCT3 pin, a TD3+ pin, a TD3- pin, a TCT4 pin, a TD4+ pin and a TD4- pin, and the network integrated circuit includes One MCT1 pin, one MX1-pin, one MX1-pin, one MCT2 pin, one MX2-pin, one MX2-pin, one MCT3 pin, one MX3-pin, one MX3-pin , An MCT4 pin, an MX4-pin, and an MX4-pin, respectively corresponding to the TCT1 pin, the TD1+ pin, the TD1- pin, the TCT2 pin, the TCT2 pin, the The TD2+ pin, the TD2-pin, the TCT3 pin, the TD3+ pin, the TD3-pin, the TCT4 pin, the TD4+ pin, and the TD4-pin. The pulse filter according to item 2 of the patent application scope, wherein the second center tap connection line is connected to the TCT1 pin, the TCT2 pin, the TCT3 pin of the network connector via the pin And one of the TCT4 pins, and the third center tap connection line is connected to the MCT1 pin, the MCT2 pin, the MCT3 pin, and the MCT4 of the network integrated circuit through the pin One of the pins. According to the pulse filter described in item 1 of the patent application scope, wherein the second center tap connecting wire is connected to the corresponding pin by the first toroidal coil passing through the second magnetic ring, and the third middle The tap connecting wire is connected to the corresponding pin by the third loop coil passing through the third magnetic ring. According to the pulse filter described in item 1 of the patent application scope, wherein the second center tap connection wire does not pass through the second magnetic ring, but is directly connected to the corresponding pin by the first toroidal coil, and the The third center tap connection wire does not pass through the third magnetic ring, but is directly connected to the corresponding pin by the third loop coil. According to the pulse filter described in item 1 of the patent application scope, wherein the first magnetic ring, the second magnetic ring, and the third magnetic ring are iron core magnetic rings. The pulse filter according to item 1 of the patent application scope, wherein the first toroidal coil, the second toroidal coil, the second middle-tap connecting wire, the third toroidal coil, the third middle-tap connecting wire are Two-phase twisted enameled wire.

Images