TWM468848U - Network signal coupling and electromagnetic interference prevention circuit - Google Patents

Description

Network signal coupling and anti-electromagnetic interference circuit

The present invention provides a circuit for coupling and anti-electromagnetic interference of a network signal, in particular, a processing circuit is provided with a coupling module and an anti-electromagnetic interference module between the network connector and the network chip, and the processing circuit is used to isolate the electrical, Coupling signals and absorbing harmonics, thereby improving signal coupling, transmission efficiency and stability of use.

According to the rapid development of computer technology today, desktop computers or notebook computers have been widely used in every corner of the society, and their computer development trend is also moving toward the direction of computing power, speed and small size. Road communication technology is also rapidly developing and bringing people's life, study, work and leisure into a new realm that is different from the past, enabling people to transmit the required instant information through network communication. Advertising or mailing, etc., while searching for various information, instant messaging or online games through the Internet, the relationship between people and the Internet is more eager and inseparable.

However, the network part uses cable connection and wireless transmission to transmit data. Cable connection technology requires a network connector. The traditional network connector has a transformer module and a common mode suppression module. Please refer to the eighth figure. The general manufacturer's method is to install the transformer coil B and the filter coil C on the circuit board A, and the transformer coil B and the filter coil C are wound around the core D. D1, the connector at the end of the wire D1 is soldered to the circuit board A Point, because the coil needs to be hand-wound, resulting in low production efficiency, and can not be automated production, the coil is also easy to break and the cost is increased, and the tightness of the winding, the distance, the number of turns, etc. will also affect the effect, resulting in a good quality product.

Furthermore, as the use of the Internet becomes more widespread, the amount of data transmitted over the network becomes larger and larger, and network vendors have been increasing the speed of network transmission from 10 Mbps to 100 Mbps in order to meet the needs of users. 1Gbps, even the current fiber-optic network transmission speed can reach more than 10Gbps, however, the transformer coil B is the inductor, the impedance of the inductor (Z) is called the inductive reactance, and its unit is ohm (Ω), the formula of the inductive reactance Is: Z=2π*f*L

In the above formula, f is the frequency, the unit is Hertz (Hz); L is the inductance value of the inductance, the unit is Henry (H), because the network connector uses the inductance characteristic of the transformer B to isolate the electrical and couple the signal, so In order to transfer the signal from the primary side to the secondary side, the transformer B must have a predetermined inductance. It can be known from the above formula that the inductive reactance is proportional to the operating frequency and the inductance, so the signal frequency is increased. Under the condition, the inductive reactance will also increase (please refer to the comparison between the frequency and the inductive reactance of the 350μH capacitor), but the increase in the inductive reactance will make the signal attenuation larger. Therefore, there will be a lack of network disconnection or slow network transmission speed. Please refer to the tenth figure. It can be seen from the figure that when the insertion loss of the transformer is -3db, the frequency response is about 0.45MHz. ~240MHz, because the insertion loss will increase rapidly, so the operating frequency of the transformer can only be within a certain narrower bandwidth; in addition, because the characteristics of the transformer B are from low frequency, low intensity, medium frequency and high intensity And high frequency and low intensity Signal strength, so when the web speeds up to 1Gbps, but let transformer coil B is reduced, but not easy to achieve compliance with the requirements of the product.

Therefore, manufacturers want to solve the problem and lack of conventional transformer coils, and use existing electronic components and circuit design to develop and improve. However, because the transformer coil has inductance characteristics, the signal is attenuated. If the signal is not attenuated, it will be When transmitting to the network chip on the main board, radiation is generated due to the harmonics generated by the signal and electromagnetic field interference occurs, so that the electronic components or devices around the network chip are disturbed and cannot operate normally or the performance is degraded. Utilizing existing electronic components and circuit design to solve the problems of poor quality, high cost, incapable of automatic production and low strength at high network transmission speed, and the effect of preventing electromagnetic interference, The inventor and the person who is engaged in this industry are aiming to improve.

Therefore, in view of the above-mentioned problems and deficiencies, the creators have collected relevant information, and through multi-party assessment and consideration, and through years of experience in the industry, through continuous trial and modification, we have designed such network signal coupling and The birth of the patent for the creation of anti-electromagnetic interference circuits.

The main purpose of the present invention is that the one or more channels are provided with a coupling module and an anti-electromagnetic interference module between the first connection end and the second connection end, and the coupling module is used to isolate the electrical and coupled signals. Then, the inductance of the anti-electromagnetic interference module is used to absorb the harmonics of the signal in the higher frequency portion of the frequency band, so that the network signal coupling effect is good at the high network frequency, and the signal is transmitted to the network. After the circuit chip, it will not cause electromagnetic interference to the surrounding components, thereby achieving the purpose of improving signal coupling, transmission effect and stability of use.

The secondary purpose of the creation is that the anti-electromagnetic interference module is respectively provided with an inductance by one or more channels of the second circuit, and further between the two inductors and the two circuits. There are two second capacitors connected together, and the other ends of the second capacitors are electrically connected to the ground end, and the inductors and the second capacitors are used to absorb the harmonics of the signals in the lower frequency and higher frequency portions of the frequency band. Let the signal generate low frequency or high frequency harmonics, and the signal will not be electromagnetically disturbed to the surrounding components after being transmitted to the network chip.

Another purpose of the present invention is that the coupling module is provided with a capacitor connected by one or more channels, and the anti-electromagnetic interference module is respectively connected with an inductor by one or more circuits. One end of the inductor has two second capacitors connected in series, and the other ends of the second capacitors are electrically connected to the ground end. Because only the general electronic components are soldered to the circuit board without manual winding, automatic production can be performed. And the quality of the finished electronic components can be purchased at the time of purchase, thereby achieving the goal of improving yield and automatically reducing production costs.

[this creation]

1‧‧‧Processing circuit

10‧‧‧First connection

11‧‧‧Second connection

12‧‧‧ channel

121‧‧‧ Circuitry

13‧‧‧Coupling module

131‧‧‧first capacitor

14‧‧‧Anti-electromagnetic interference module

141‧‧‧Inductance

142‧‧‧second capacitor

143‧‧‧ Grounding

2‧‧‧Network connector

3‧‧‧Network Chip

4‧‧‧ boards

[study]

A‧‧‧PCB

B‧‧‧Variable coil

C‧‧‧Filter coil

D‧‧‧core

D1‧‧‧ wire

The first figure is a block diagram of a preferred embodiment of the present invention.

The second figure is a circuit diagram of the processing circuit of the preferred embodiment of the present invention.

The third figure is a block diagram of another embodiment of the creation.

The fourth figure is a circuit diagram of a processing circuit of another embodiment of the present invention.

The fifth figure is a circuit diagram of a processing circuit of still another embodiment of the present invention.

The sixth figure is a waveform diagram of the signal frequency and intensity after the processing coupling module is processed.

The seventh figure is a waveform diagram of the signal frequency and intensity after the processing of the coupling module and the anti-electromagnetic interference module.

The eighth figure is a stereoscopic appearance of the conventional one.

The ninth figure is a comparison of the frequency and the inductive reactance.

The tenth figure is the frequency response diagram of the conventional transformer.

In order to achieve the above objectives and effects, the technical means and structure of the present invention are described in detail in the preferred embodiment of the present invention, and the features and functions are as follows.

Referring to the first and second figures, it can be clearly seen from the figure that in the preferred embodiment of the present invention, the processing circuit 1 is disposed on the circuit board 4, and the two ends are respectively electrically connected. The first connection end 10 of the network connector 2 and the second connection end 11 electrically connected to the network chip 3, the processing circuit 1 is provided with a plurality of channels 12 each having two circuits 121, one or more A coupling module 13 and an anti-electromagnetic interference module 14 are connected between the first connecting end 10 and the second connecting end 11 of the channel 12, and the coupling module 13 is respectively connected by one or more circuits 12 and 12 circuits 121. The capacitor 131 and the anti-electromagnetic interference module 14 are respectively connected with an inductor 141 by one or more channels 12 and 12 circuits 121 (such as a magnetic bead, a wafer bead, a plug-in magnetic bead, a winding inductor, a chip inductor, and a plug-in inductor). Or common mode inductance, etc.).

Please refer to the first, second, third, fourth and fifth figures. It can be clearly seen from the figure that in another embodiment of the present invention, the anti-electromagnetic interference module 14 has one or more channels 12 The two circuits 121 are respectively connected with an inductor 141, and further two second capacitors 142 are connected in series between the two circuits 121 at one end of the two inductors 141, and the other ends of the second capacitors 142 are electrically connected to the ground end 143 to prevent electromagnetic interference. The other ends of the second capacitors 142 of the module 14 can also be connected to the grounding end 143. The second capacitors 142 can be disposed adjacent to the first connecting end 10 or the second connecting end 11 of the inductor 141.

The processing circuit 1 is electrically connected to the terminals of the network connector 2 by the first connection end 10, and the processing circuit 1 is a plurality of pins electrically connected to the network chip 3 by the second connection end 11, and the channel thereof The number of 12 can be four, and the circuits 121 of the four channels 12 are respectively connected to MD0+ and MX0+, MD0- and MX0-, MD1+ and MX1+, MD1- and MX1-, MD2+ and MX2+, MD2- and MX2-, MD3+ and MX3+. MD3- and MX3-, the position of which can be changed according to actual design requirements, and thus is not limited to the patent scope of the present invention.

The network chip 3 is a voltage mode chip, so the network chip 3 supplies a driving voltage to the signal coupling circuit 1. Since the signal changes with the voltage during transmission, when the current mode network chip 3 is used, the coupling is performed. The module 13 needs to provide a resistor to generate a voltage for signal transmission. The network chip 3 using the voltage mode does not need to be provided with a resistor, so the coupling module 13 only needs to be provided with the first circuit 121 of one or more channels 12. The capacitor 131, because the characteristic of the first capacitor 131 causes the supply voltage to flow to the first end thereof, causes the first end to generate a transient charge of a single polarity (such as a positive charge), and the second end of the first capacitor 131 Generating a transient charge of another polarity (such as a negative charge), and after stopping the supply of positive charge to the first end of the first capacitor 131 after a predetermined period of time, the second end of the first capacitor 131 will have a negative charge along When the circuit 121 is drained, the transmission effect of the signal coupling is achieved. At the same time, the first capacitor 131 does not allow the signal to directly pass through the circuit 121, thereby achieving the effect of preventing the reverse current. However, since the first capacitor 131 performs The speed at the time of discharge is related to the time constant, so it is necessary to match the time constant with the signal period, so that the charge and discharge time is just enough for the complete signal transmission without cutting off the signal, and the capacitance of the first capacitor 131 is increased. The constant will also increase, so the capacitance of the first capacitor 131 is 100μF~0.01μ. F, and the preferred capacitance of the first capacitor 131 is 0.1 μF.

The coupling module 13 is configured by a first capacitor 131 connected to a circuit 121 for coupling the two terminals. The impedance (Z) of the capacitor is called capacitive reactance, and the unit is ohm (Ω). The formula of the capacitive reactance is: Z =1/(2π*f*C)

In the above formula, f is the frequency, the unit is Hertz (Hz); C is the capacitance value of the capacitor, and the unit is Farah (F). Since the characteristics of the capacitor are used to isolate the electrical and couple the signal, it can be known from the above formula that the capacitive reactance It is inversely proportional to the operating frequency and the capacitance value. Therefore, when the first capacitor 131 of the same capacitance value is used and the signal frequency is increased, the capacitive reactance is reduced, and the attenuation of the signal is also reduced. With good network connection and fast signal transmission speed, the strength of the capacitor will increase as the frequency is higher. In today's network frequency (frequency bandwidth) is getting more and more In the high case (greater than 1 Gbps), the capacitor uses the DC power of the isolated computer to form an electric field induction for signal coupling, and the characteristics of the capacitor also increase the coupling effect of the high frequency network signal.

Furthermore, please refer to the first and third figures. It can be clearly seen from the figure that the circuit board 4 provided by the processing circuit 1 can be directly provided with the network chip 3 and then with the plurality of network connectors 2 The terminal is electrically connected; and the circuit board 4 disposed in the processing circuit 1 can also be disposed inside the network connector 2, and then the network connector 2 is electrically connected to the external circuit board and connected to the network on the external circuit board. The chip 3 is electrically connected, and only has the function of coupling and filtering the signal transmitted between the network connector 2 and the network chip 3. However, the configuration of the network connector 2 and the network chip 3 It is a well-known technique, and the details constitute a non-inventive point of the invention, and will not be described again.

Please refer to the first, second, third, fourth, fifth, sixth and seventh figures. As can be clearly seen from the figure, since the signal processed by the coupling module 13 is hardly attenuated, it is almost The original signal is transmitted to the end of the network chip 3, and the detection of the transmitted signal is taken as an example. Since the network signal transmission is a multiple, the signal will have a large intensity at a low frequency of 125 MHz and a high frequency of 250 MHz ( Harmonics of dB), and because there are other signals coming in when the signal is transmitted, noise will be generated, and the noise will be filtered out. Since the inductance 141 of the anti-electromagnetic interference module 14 utilizes an increase in current, The energy is temporarily stored in the form of a magnetic field, and when the current is reduced, the energy of the magnetic field is released to resist the change of the current, and the harmonics of the higher frequency portion of the frequency band are absorbed, and the anti-electromagnetic interference module 14 is connected in series. The second capacitor 142 has a high pass effect, and as the capacitance of the second capacitor 142 decreases, the filtered signal frequency increases, so that the second capacitor 142 can be adjusted. Tolerance The number passes but the noise is filtered out. It uses the ability to store charge to absorb the harmonics of the lower frequency part of the frequency band, and then the harmonics of the low frequency part are shunted to the ground terminal 143, thereby filtering out the low frequency. The effect of the noise, so the signal processed by the anti-electromagnetic interference module 14 will not generate harmonics in the high frequency band or the low frequency band, so after the signal is transmitted to the network chip 3, electromagnetic waves will not be generated to the surrounding components. Interference, thereby achieving the purpose of improving the stability of use.

At the same time, since the filter module only performs noise filtering on the signal, the filter module can be disposed on the side of the coupling module 13 adjacent to the first connection end 10 or adjacent to the second connection end 11 and can be mixed. Filter the effect.

Furthermore, since the anti-electromagnetic interference module 14 is respectively connected with an inductor 141 by two circuits 121 of each channel 12, the two inductors 141 are connected in parallel to one end of the coupling module 13 There is a capacitor 142, and the other end of each capacitor 142 is electrically connected to the second ground end 143. The circuit arrangement can form an impedance match with the network loop to comply with the communication regulations.

The above-mentioned network signal coupling and anti-electromagnetic interference circuit of the present invention can have the following advantages when used in actual use, such as:

(1) The one or more channels 12 are connected with a coupling module 13 and an anti-electromagnetic interference module 14 between the first connection end 10 and the second connection end 11, and the coupling module 13 is used to isolate electrical and coupling. The signal allows the coupling circuit to have good network signal coupling effect at high network frequencies, thereby improving the signal coupling and transmission effect, and then using the inductance 141 of the anti-electromagnetic interference module 14 to compare the signal in the frequency band. Some of the harmonics are absorbed, so that the signal is transmitted to the network chip 3 without electromagnetic interference to the surrounding components.

(2) The anti-electromagnetic interference module 14 is respectively provided with an inductor 141 by one or more channels 12 and two circuits 121, and further has two second capacitors 141 connected in series between the two inductors 141 and the two circuits 121. The second capacitor 141 is electrically connected to the ground terminal 142, and the inductance 141 and the second capacitor 141 of the electromagnetic interference prevention module 14 are used to perform harmonics of the signal in the lower frequency and higher frequency portions of the frequency band. Absorption, let the signal generate low frequency or high frequency harmonics, whether the signal is transmitted to the network chip 3 will not cause electromagnetic interference to the surrounding components.

(3) The coupling module 13 is provided with a capacitor 131 connected by one or more channels 12 of the circuit 121, and the anti-electromagnetic interference module 14 is respectively provided with an inductance 141 by one or more channels 12 and two circuits 121. The second circuit 121 of the second inductor 141 has a second capacitor 142 connected in series, and then the second capacitor 142 is electrically connected to each other. Connected to the ground terminal 143, because only the general electronic component is used, it can be automatically produced without manual winding, but directly soldered on the circuit board, and the electronic component finished product can be quality-managed at the time of purchase. Therefore, the quality of the product can be maintained in the range of good products, thereby achieving the goal of improving yield and automatically reducing production costs.

Therefore, the present invention is mainly for the circuit signal coupling and anti-electromagnetic interference circuit, and the second connection end of the processing circuit 1 is electrically connected to the first connection end 10 of the network connector 2 and electrically connected to the network. The second connection end 11 of the circuit chip 3, the processing circuit 1 is provided with a plurality of channels 12 respectively having two circuits 121, and one or more channels 12 are connected between the first connection end 10 and the second connection end 11 There is a coupling module 13 and an anti-electromagnetic interference module 14 . The coupling module 13 has a first capacitor 131 connected to one or more channels 12 and two circuits 121 , and one or more anti-electromagnetic interference modules 14 . The circuit 12 of the second circuit 121 is respectively provided with an inductor 141, so that the coupling module 13 can be used to isolate the electrical and coupled signals, thereby improving the signal coupling and transmission effect, and then using the inductance 141 of the anti-electromagnetic interference module 14 to signal the signal The harmonics of the high-frequency part are absorbed, so that the signal is transmitted to the network chip 3, and electromagnetic interference is not generated to the surrounding components, so as to achieve the purpose of improving signal coupling, transmission effect and stability of use, the main protection focus is above. Said For the preferred embodiment of the present invention, it is not limited to the scope of the patent of the creation. Therefore, all the modifications and equivalent structural changes that are made by using the present specification and the contents of the schema should be similarly included in the patent of the creation. Within the scope, it is combined with Chen Ming.

In summary, the above-mentioned network signal coupling and anti-electromagnetic interference circuit can achieve its efficacy and purpose when it is used. Therefore, this creation is a practical and excellent creation, which is in line with the application requirements of the new patent. , 提出 apply in accordance with the law, and hope that the trial committee will grant this book as soon as possible. In order to protect the creators' hard work, if there is any doubt in the arbitral tribunal, please do not hesitate to give instructions to the creators, and the creators will try their best to cooperate with them.

1‧‧‧Processing circuit

10‧‧‧First connection

11‧‧‧Second connection

12‧‧‧ channel

121‧‧‧ Circuitry

13‧‧‧Coupling module

131‧‧‧first capacitor

14‧‧‧Anti-electromagnetic interference module

141‧‧‧Inductance

Claims (16)

A circuit for coupling a network signal and preventing electromagnetic interference, comprising: a processing circuit disposed on a circuit board having a network chip and electrically connected to the network connector to process the signal, wherein the network chip is a voltage The mode of the chip, the network chip supplies the driving voltage to the signal coupling circuit, and the improvement is that the processing circuit is provided with a plurality of channels respectively having two circuits, and the two ends of the plurality of channels respectively have a first connection end connecting the network connectors Connecting a second connection end of the network chip, and one or more channels are connected with a coupling module and an anti-electromagnetic interference module between the first connection end and the second connection end, and the coupling module is one or one The second circuit of the above channel is connected with a first capacitor, and the anti-electromagnetic interference module is respectively connected with an inductor by one or more circuits of the channel. The circuit of the network signal coupling and the anti-electromagnetic interference according to the first aspect of the patent application, wherein the anti-electromagnetic interference module has a capacitor connected in series between the two circuits of the second inductor adjacent to the first connection end, and then the other end of each capacitor Electrically connected to the ground. The circuit for coupling the network signal and preventing electromagnetic interference according to the first aspect of the patent application, wherein the anti-electromagnetic interference module has a capacitor connected in series between the two circuits of the second inductor adjacent to the second connection end, and then the other end of each capacitor Electrically connected to the ground. For example, the circuit for signal coupling and anti-electromagnetic interference according to claim 1 is characterized in that the capacitance of the first capacitor of the coupling module is 100 μF to 0.01 μF. The circuit for coupling the network signal and preventing electromagnetic interference according to claim 4, wherein the first capacitor has a preferred capacitance of 0.1 μF. A circuit for coupling a network signal and preventing electromagnetic interference as described in claim 1 of the patent scope, The coupling module is provided with a filter module adjacent to the first connection end. The circuit of the network signal coupling and the anti-electromagnetic interference according to the first aspect of the patent application, wherein the coupling module is provided with a filter module adjacent to the second connection end. For example, the circuit for signal coupling and anti-electromagnetic interference according to claim 1 of the patent scope, wherein the number of the plurality of channels can be four, and the circuits of the four channels are respectively connected to MD0+ and MX0+, MD0- and MX0- , MD1+ and MX1+, MD1- and MX1-, MD2+ and MX2+, MD2- and MX2-, MD3+ and MX3+, MD3- and MX3-. A circuit for coupling a network signal and preventing electromagnetic interference, comprising: a processing circuit disposed on an internal circuit board of the network connector and electrically connected to the network chip to couple the signal, wherein the network chip is in a voltage mode The chip, the network chip supplies a driving voltage to the signal coupling circuit, and the improvement is that the processing circuit is provided with a plurality of channels respectively having two circuits, and the two ends of the plurality of channels respectively have a first connection end connecting the network connectors, Connecting a second connection end of the network chip, and one or more channels are connected with a coupling module and an anti-electromagnetic interference module between the first connection end and the second connection end, and the coupling module is one or more The second circuit of the channel is connected with a first capacitor, and the anti-electromagnetic interference module is respectively connected with an inductance by two circuits of one or more channels. The circuit for coupling the network signal and preventing electromagnetic interference according to claim 9 , wherein the anti-electromagnetic interference module has a capacitor connected in series between the two circuits of the second inductor adjacent to the first connection end, and then the other end of each capacitor Electrically connected to the ground. For example, the circuit for signal coupling and anti-electromagnetic interference according to claim 9 of the patent scope, The anti-electromagnetic interference module has a capacitor connected in series between the two circuits of the two inductors adjacent to the second connection end, and the other ends of the capacitors are electrically connected to the ground end. The circuit of the network signal coupling and the anti-electromagnetic interference according to claim 9, wherein the capacitance of the first capacitor of the coupling module is 100 μF to 0.01 μF. The circuit for coupling the network signal and preventing electromagnetic interference according to claim 11, wherein the first capacitor has a preferred capacitance of 0.1 μF. The circuit of the network signal coupling and the anti-electromagnetic interference according to claim 9, wherein the coupling module is provided with a filter module adjacent to the first connection end. The circuit of the network signal coupling and the anti-electromagnetic interference according to claim 9, wherein the coupling module is provided with a filtering module adjacent to the second connecting end. For example, the network signal coupling and anti-electromagnetic interference circuit described in claim 9 wherein the number of the plurality of channels can be four, and the circuits of the four channels are respectively connected to MD0+ and MX0+, MD0- and MX0- , MD1+ and MX1+, MD1- and MX1-, MD2+ and MX2+, MD2- and MX2-, MD3+ and MX3+, MD3- and MX3-.