JP3185317U - Network signal coupling and electromagnetic interference prevention circuit - Google Patents

Abstract

A network signal coupling and electromagnetic interference prevention circuit is provided.
The circuit board is installed on a circuit board and is positioned between a network connector and a network chip. The processing circuit 1 is provided with a plurality of paths 12 each having two circuits 121. One or more paths 12 connect the coupling module 13 and the electromagnetic interference prevention module 14 between the network connector and the network chip. The coupling module 13 connects two circuits 121 of one or more paths 12 to the first capacitor 131, and the electromagnetic interference prevention module 14 is connected between the two circuits 121 of one or more paths 12. Two second capacitors 141 having another end connected to the ground end 142 are connected in series, and the coupling module 13 is used to isolate electricity, couple the signal, and further enhance the coupling and transmission effect of the signal. The electromagnetic interference prevention module 14 absorbs subharmonics in the high frequency part of the signal to prevent electromagnetic interference.
[Selection] Figure 2

Description

  The present invention relates to a network signal coupling and electromagnetic interference prevention circuit, and a processing circuit between a network connector and a network chip is provided with a coupling module and an electromagnetic interference prevention module. It achieves the purpose of coupling, absorbing harmonics, and further improving signal coupling and transmission effects and stability.

  Computer technology has evolved rapidly, and desktop and notebook computers have already become universally present in every part of society. The trend of computer development is that it has excellent computing function, high processing speed, small volume, and network communication technology is also developing rapidly. In addition, people's lives, learning, work, and leisure have reached new grounds different from the past, so that people can access necessary information through network communication, transmit advertisements to each other, and exchange emails. Became. At the same time, people and networks became more intimate and intimate, such as searching for various information using the network and enjoying online games.

  However, the network transmits data by two types of cable connection and wireless transmission, but the cable connection technology has to attach a network connector, traditional network connector is a transformer module and in-phase signal rejection module Is provided. As shown in FIG. 5, in a general system, a transformer coil B and a filter coil C are mounted on a circuit board A, and the transformer coil B and the filter coil C are provided with a conducting wire D1 on a wire core D. The D1 terminal connection is soldered to the contact of circuit board A. Since the coil must be wound by hand, the production efficiency is reduced and automation production is impossible. In addition, the coil is easy to cut, and the cost is increased. Differences in winding tightness, distance, number of windings and the like also affect the effect and cause instability of product quality.

  Furthermore, as the network application becomes widespread, the capacity of transmission data on the network also increases. Network manufacturers continue to increase network transmission rates from 10 Mbps to 100 Mbps or 1 Gbps to meet user needs, and to date optical fiber network transmission rates have reached 10 Gbps. However, the transformer coil B is an inductor, and the impedance (Z) of the inductor is called inductive reactance. The unit is ohms (Ω), and the reactance formula is Z = 2π * f * L.

  In the above formula, f is the frequency, the unit is Hertz (Hz), L is the induction coefficient of the inductor, and the unit is Henry. The network connector isolates electricity and couples signals by the inductor characteristics of the transformer coil B. Therefore, in order to transmit a signal from the primary side to the secondary side, the transformer coil B must be provided with an impedance. As understood from the above formula, since the reactance, the working frequency, and the induction coefficient are directly proportional, in the situation where the signal frequency increases, the reactance increases accordingly. The graph shown in FIG. 6 is a comparison diagram of the frequency and reactance of a capacitor of 350 μH. When the reactance increases, signal attenuation increases, and problems such as network disconnection and slow transmission speed occur. Referring to FIG. 7 at the same time, as can be seen from the figure, when the insertion loss of the transformer is −3 db, the frequency response is about 0.45 MHz to 240 MHz. Because the loss increases rapidly when the frequency is exceeded, the working frequency of the transformer is only within the specified relatively narrow bandwidth. Further, since the characteristic of the transformer coil B is a curve formed by low intensity at low frequency, high intensity at medium frequency, and low intensity at high frequency, when the transmission speed of the network reaches 1 Gbps, the transformer coil B However, the signal strength of the product will decrease, making it difficult to meet product performance requirements.

  Therefore, the manufacturer advanced research and development using existing electronic components and circuit design to improve the problems of the known transformer coil. However, because the transformer coil has inductor characteristics, it attenuates the signal. If the signal is unattenuated and transmitted to the network chip on the main board, harmonics are generated in the signal and radiated radially, causing interference phenomenon of the electromagnetic field, so that each electronic component or device around the network chip Will not be able to operate normally due to interference or performance will be degraded. Therefore, using existing electronic components and circuit designs, we can solve the problems such as poor quality of known transformer coils, high cost, inability to produce automation, reduced strength when network transmission speed is high, etc. Providing a preventive effect is a goal that the inventor and contractors working in the industry wish to improve.

  In light of the above-mentioned problems, the inventor collected related materials, added various evaluations and considerations, continued trial production and improvement based on experience accumulated over many years in the industry, and developed the network signal of the present invention. Coupling and electromagnetic interference prevention circuit.

  The main object of the present invention is to provide the following network signal coupling and electromagnetic interference prevention circuit. It connects a coupling module and an electromagnetic interference prevention module between the first and second connecting ends of one or more paths, isolates electricity using the coupling module, and couples signals. Ring. In addition, the electromagnetic interference prevention module capacitor is used to absorb harmonics in the low-frequency part of the signal, so that it still exhibits a good network signal coupling effect at high network frequencies, and the signal transmitted to the network chip is the surrounding component. This achieves the purpose of enhancing signal coupling and transmission effect and stability without causing electromagnetic interference.

  The next object of the present invention is to provide the following network signal coupling and electromagnetic interference prevention circuit. In the electromagnetic interference prevention module, two second capacitors are connected in series between two circuits of one or more paths, and the other end of each second capacitor is electrically connected to the ground terminal. Uses general completed electronic components, so there is no need to wrap the wires artificially, enabling automation production, purchasing quality parts, easy quality control, increasing yields, and reducing production costs through automation Realize the purpose of reduction.

The network signal coupling and electromagnetic interference prevention circuit of the present invention has the following effects.
(1) One or more paths 12 are connected to the coupling module 13 and the electromagnetic interference prevention module 14 between the first connecting end 10 and the second connecting end 11, and the coupling module 13 is used. Isolate electricity and couple signals. As a result, when the coupling circuit is used at a high frequency in the network, a good network signal coupling effect is realized, the signal coupling and transmission effect is further enhanced, and the signal is obtained by using the second capacitor 141 of the electromagnetic interference prevention module 14. Therefore, the signal transmitted to the network chip 3 does not cause electromagnetic interference to surrounding components.
(2) In the electromagnetic interference prevention module 14, a second capacitor 141 is connected in series between two circuits 121 of one or more paths 12, and another end of each second capacitor 141 is electrically connected to the ground terminal 142. Connect. Since general finished electronic components are used, it is not necessary to wrap the wires artificially, and they are incorporated directly on the circuit board. Therefore, automation production is possible, quality control is easy because purchased parts are purchased, product quality can be maintained within a good product range relatively easily, yield is increased, and automation achieves the purpose of reducing production costs .

It is a block diagram of the Example of this invention. It is a circuit diagram of the processing circuit of the Example of this invention. It is a block diagram of another Example of this invention. It is a circuit diagram of the processing circuit of another Example of this invention. It is a well-known three-dimensional external view. It is a comparison graph of a well-known frequency and reactance. It is a frequency response graph of a well-known transformer.

  The technical means employed by the present invention and the structure thereof to achieve the above-described objects and effects will now be described in detail through an embodiment of the present invention in combination with the drawings. This will help to understand its features and effects.

  Referring to FIGS. 1, 2, 3, and 4, as clearly understood from the drawings, in the embodiment of the present invention, the processing circuit 1 is installed on the circuit board 4 and at both ends, respectively. And a second connecting end 11 electrically connected to the network chip 3 and a plurality of paths each including two circuits 121 in the processing circuit 1. 12, and one or more paths 12 connect the coupling module 13 and the electromagnetic interference prevention module 14 between the first connecting end 10 and the second connecting end 11. Two circuits 121 in one or more paths 12 are respectively connected to the first capacitor 131, and the electromagnetic interference prevention module 14 is connected between the two circuits 121 in one or more paths 12. The second capacitor 141 in series, and further electrically connected to the ground terminal 142 of the end on the side apart from the respective second capacitor 141 from the circuit 121 of.

  1, 2, 3, and 4, as clearly understood from the drawings, in another embodiment of the present invention, another end of the second capacitor 141 of the electromagnetic interference prevention module 14 is connected. After being connected to each other, they are further connected to the ground terminal 142, the processing circuit 1 is electrically connected to each terminal of the network connector 2 by the first connection terminal 10, and the processing circuit 1 is connected to the network chip by the second connection terminal 11. Electrically connected to a plurality of 3 pins. The number of paths 12 is four, and each circuit 121 of the four paths 12 has MD0 + and MX0 +, MD0- and MX0-, MD1 + and MX1 +, MD1- and MX1-, MD2 + and MX2 +, MD2- and MX2, respectively. -Connected to MD3 + and MX3 +, MD3- and MX3-, and their positions can be changed according to actual design needs, and do not limit the scope of the registration request of the present invention.

  Since the network chip 3 is a voltage mode chip, the network chip 3 supplies a driving voltage to the processing circuit 1. The signal changes with the voltage during transmission, and when the current mode network chip 3 is used, the coupling module 13 can generate the voltage only by providing an electrical resistance. Since the network chip 3 in the mode does not need to be provided with an electrical resistance, the coupling module 13 only needs to provide the first capacitor 131 in each circuit 121 of one or more paths 12. When a voltage / current is supplied to the first end due to the characteristics of the first capacitor 131, a transient charge (for example, a negative charge) of a single polarity is generated at the first end, and the positive charge is transferred to the first end after a predetermined time. When the supply to the first end of the capacitor 131 is stopped, the second end of the first capacitor 131 causes a negative charge to flow away along the circuit 121, thereby exhibiting a signal coupling transmission effect. At the same time, the first capacitor 131 exhibits a reverse current prevention effect without passing the signal directly to the circuit 121. However, since the speed at the time of charging / discharging of the first capacitor 131 is related to the time constant, complete signal transmission can be performed without interrupting the signal during the charging / discharging time only by combining the time constant and the signal period. Further, after the increase in the capacity of the first capacitor 131, the time constant increases accordingly. The capacity of the first capacitor 131 is 0.01 μF to 100 μF, and a preferable capacity is 0.1 μF.

  The coupling module 13 couples both end circuits by a first capacitor 131 connected on the circuit 121, and the impedance (Z) of the capacitor is called capacitive reactance. The unit is ohms (Ω), and the capacitive reactance formula is Z = 1 / (2π * f * C).

  In the formula, f is a frequency, and the unit is hertz (Hz). C is the capacitance of the capacitor, and its unit is farad (F). Capacitor characteristics are used to isolate electricity and couple signals. As understood from the above formula, the capacitive reactance, the working frequency and the capacitance of the capacitor are inversely proportional. Therefore, in the situation where the first capacitor 131 having the same capacity is used and the signal frequency is increased, the capacitive reactance is reduced accordingly, and the signal attenuation is also reduced. For this reason, the network connection can be performed satisfactorily and the signal transmission speed can be increased. As the frequency increases, the strength of the capacitor increases as the frequency increases, and the current network frequency (bandwidth) increases more and more (1 Gbps and above). As a result, signal coupling is performed, and the coupling effect of the high-frequency network signal is also improved by the characteristics of the capacitor.

  Further, referring to FIGS. 1 and 3, as clearly understood from the drawings, the network chip 3 is directly installed on the circuit board 4 on which the processing circuit 1 is installed, and the plurality of terminals of the network connector 2 are electrically connected. May be connected. The circuit board 4 on which the processing circuit 1 is installed is installed inside the network connector 2, and the network connector 2 is electrically connected to the external circuit board, and is also electrically connected to the network chip 3 installed on the external circuit board. However, it need only have a coupling and filtering effect on the signal transmitted between the network connector 2 and the network chip 3. The arrangement of the network connector 2 and the network chip 3 is a well-known technique, and the detailed configuration is not an important point of the present invention, so that the description thereof is omitted.

  Referring to FIGS. 1, 2, 3, and 4, since the signal processed through the coupling module 13 hardly attenuates, as is clear from the figure, most of the original signal is a network chip. 3 will be described as an example in which detection is performed using a transmitted signal transmitted from one end of 3. Since the transmission of the network signal is a multiple, the signal generates harmonics with a relatively high intensity (dB) at a low frequency of 125 MHz and a high frequency of 250 MHz, and when other signals come in during signal transmission. Since noise is generated, it is necessary to remove the noise. Also, the second capacitor 141 in series with the electromagnetic interference prevention module 14 has a high pass filter (High Pass) effect and increases the signal frequency that can be removed as the capacity of the second capacitor 141 decreases. Adjust the capacity, let the signal pass and remove the noise. It absorbs harmonics in the low frequency part in the frequency band using the charge storage capability, and further shunts the harmonics in the low frequency part to the ground terminal 142, thereby causing a low frequency noise removal effect. As a result, the signal processed by the electromagnetic interference prevention module 14 does not cause harmonics in the low frequency band, and after the signal is transmitted to the network chip 3, it does not cause electromagnetic interference in the surrounding components and is stable in use. Achieve the purpose of enhancing sex.

  At the same time as described above, the coupling module 13 only removes noise from the signal. Therefore, the coupling module 13 is located on one side of the electromagnetic interference prevention module 14 near the second connecting end 11 or near the second connecting end 11. Installed on one side, both have a noise removal effect.

When the network signal coupling and electromagnetic interference prevention circuit of the present invention is actually used, it has the following characteristics.
(1) One or more paths 12 are connected to the coupling module 13 and the electromagnetic interference prevention module 14 between the first connecting end 10 and the second connecting end 11, and the coupling module 13 is used. Isolate electricity and couple signals. As a result, when the coupling circuit is used at a high frequency in the network, a good network signal coupling effect is realized, the signal coupling and transmission effect is further enhanced, and the signal is obtained by using the second capacitor 141 of the electromagnetic interference prevention module 14. Therefore, the signal transmitted to the network chip 3 does not cause electromagnetic interference to surrounding components.
(2) In the electromagnetic interference prevention module 14, a second capacitor 141 is connected in series between two circuits 121 of one or more paths 12, and another end of each second capacitor 141 is electrically connected to the ground terminal 142. Connect. Since general finished electronic components are used, it is not necessary to wrap the wires artificially, and they are incorporated directly on the circuit board. Therefore, automation production is possible, quality control is easy because purchased parts are purchased, product quality can be maintained within a good product range relatively easily, yield is increased, and automation achieves the purpose of reducing production costs .

  As described above, the present invention is mainly applied to the network chip 3 and the first series connection end 10 electrically connected to the network connector 2 at both ends of the processing circuit 1 for the network signal coupling and electromagnetic interference prevention circuit. A second connecting end 11 to be connected is provided, and the processing circuit 1 is provided with a plurality of paths 12 each including two circuits 121, and one or more paths 12 are connected to the first connecting end 10 and the second connecting end. 11, the coupling module 13 and the electromagnetic interference prevention module 14 are connected, and the coupling module 13 connects two circuits 121 of one or more paths 12 to the first capacitor 131, respectively. The interference prevention module 14 includes a second capacitor 141 connected in series between two circuits 121 in one or more paths 12, and each second capacitor 141. Electrically connected to another end of the capacitors 141 to the ground terminal 142, to isolate the electricity using a coupling module 13, coupling the signal. Furthermore, in order to enhance the signal coupling transmission effect and absorb the harmonics in the low frequency part of the signal using the second capacitor 141 of the electromagnetic interference prevention module 14, the signal transmitted to the network chip 3 can be applied to surrounding components. There is no electromagnetic interference. Therefore, the main purpose of rights protection is to improve the signal coupling and transmission effect and the stability in use, but the above description only describes the embodiment of the present invention, and the registration of the present invention. It does not limit the scope of the claims, and all modifications made based on the contents of the description and drawings of the present invention with simple modifications and equivalent effects are all within the scope of the registration claims of the present invention. It is specified here that it is included.

  As described above, when the network signal coupling and electromagnetic interference prevention circuit of the present invention is used, the effect and purpose are surely realized.

DESCRIPTION OF SYMBOLS 1 Processing circuit 10 1st connection end 11 2nd connection end 12 path | route 121 circuit 13 coupling module 131 1st capacitor | condenser 14 electromagnetic interference prevention module 141 2nd capacitor | condenser 142 grounding end 2 network connector 3 network chip 4 circuit board A circuit board B Transformer coil C Filter coil D Wire core D1 Conductor

Claims (10)

  A processing circuit that is installed on a circuit board including a network chip and that is electrically connected to a network connector and processes a signal is included. The network chip is a voltage mode chip, and the network chip processes a drive voltage. In the network signal coupling and electromagnetic interference prevention circuit, the processing circuit is provided with a plurality of paths each having two circuits, and a network connector is connected to each end of the plurality of paths. And a second connecting end connected to the network chip, and one or more paths connect the coupling module and the electromagnetic interference prevention module between the first connecting end and the second connecting end, The coupling module connects two circuits of one or more paths to the first capacitor, and The prevention module has two second capacitors in series between two circuits in one or more paths, and another end remote from each second capacitor circuit is electrically connected to the ground terminal. Features network signal coupling and electromagnetic interference prevention circuit.   2. The network signal coupling and electromagnetic interference prevention circuit according to claim 1, wherein the first capacitor of the coupling module has a capacitance of 0.01 [mu] F to 100 [mu] F.   The network signal coupling and electromagnetic interference prevention circuit according to claim 2, wherein a preferable capacitance of the first capacitor is 0.1 μF.   The network signal coupling and electromagnetic interference prevention circuit according to claim 1, wherein the filter module is installed on one side of the coupling module near the first series contact end.   2. The network signal coupling and electromagnetic interference prevention circuit according to claim 1, wherein the filter module is installed on one side near the second connecting end of the coupling module.   It is installed on the circuit board inside the net connector, and further includes a processing circuit that is electrically connected to the network chip to couple the signal. The network chip is a voltage mode chip, and the network chip processes the drive voltage. In the network signal coupling and electromagnetic interference prevention circuit supplied to the circuit, the processing circuit is provided with a plurality of paths each having two circuits, and a network connector is connected to each end of the plurality of paths. And a second connecting end connected to the network chip, and one or more paths connect the coupling module and the electromagnetic interference prevention module between the first connecting end and the second connecting end. The coupling module connects two circuits of one or more paths to the first capacitor, and The prevention module has two second capacitors in series between two circuits in one or more paths, and another end remote from each second capacitor circuit is electrically connected to the ground terminal. Features network signal coupling and electromagnetic interference prevention circuit.   The network signal coupling and electromagnetic interference prevention circuit according to claim 6, wherein a first capacitor capacity of the coupling module is 0.01 μF to 100 μF.   8. The network signal coupling and electromagnetic interference prevention circuit according to claim 7, wherein a preferable capacitance of the first capacitor is 0.1 [mu] F.   7. The network signal coupling and electromagnetic interference prevention circuit according to claim 6, wherein the filter module is installed on one side of the coupling module near the first contact end.   7. The network signal coupling and electromagnetic interference prevention circuit according to claim 6, wherein the filter module is installed on one side near the second connecting end of the coupling module.

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