CN203851110U - Circuit for filtering noise in network signal - Google Patents

Abstract

The utility model relates to a circuit of noise among filtering network signal, this noise filtering circuit utilizes network signal processing circuit electric connection network chip respectively, network connector, and processing circuit is equipped with a plurality of circuit channels between network chip and network connector, and the electric property is even equipped with electric capacity on a set of or more than a set of circuit channel respectively, autotransformer, again on a set of or more than a set of circuit channel between network chip and electric capacity, respectively with parallel mode electric connection common mode inductance unit between arbitrary two adjacent circuit channels, can carry the electromagnetic wave or the noise etc. of the network signal area of transmission among each circuit channel and filter, thereby can reduce the condition that network signal received interference such as electromagnetic wave or noise, reach stable network signal transmission's mesh.

Description

A circuit for filtering out noise in network signals

technical field

The utility model provides a circuit for filtering out noise in network signals, especially a filter circuit that can filter out noise contained in transmitted network signals in a network signal processing circuit. The processing circuit between the connectors is electrically connected to the common-mode inductance units in one or more groups of circuit channels, so as to achieve the purpose of eliminating interference such as electromagnetic waves or noise in network signals.

Background technique

Nowadays, with the rapid development of computer technology, desktop computers and notebook computers have been widely used in every corner of society. The development trend of computers is also moving towards the direction of powerful computing functions, fast speed and small size. Due to the rapid development of network communication technology, and will People's life, study, work and leisure have brought another brand-new realm that is different from the past, so that people can transmit the required real-time information, advertisements or e-mails to each other through network communication, and at the same time search various information through the network. Various information, real-time communication or online games, etc., make the relationship between people and the Internet more intense and inseparable.

The network generally uses two methods of cable connection and wireless transmission to transmit data. The cable connection needs to be equipped with a network connector. As the network is used more and more widely, the amount of data transmitted on the network is also increasing. Network manufacturers In order to meet the needs of users, the speed of network transmission has been increased, from 10Mbps to 100Mbps or 1Gbps, and even the optical fiber network transmission speed introduced now can reach more than 10Gbps. However, when the network signal line is affected by lightning, so that the network signal line is connected When the network connector receives the instantaneous high-voltage signal of a lightning strike, the instantaneous high voltage will cause damage to the electronic components and network chips that are electrically connected to the processing circuit. In addition to affecting the network signal transmission instability, interruption or complete inability to connect , It may even cause the circuit board installed on the network chip or the host of the electronic device (such as a computer or sharer, etc.) to fail or be damaged by the impact of instantaneous high voltage. The type of general network depends on the geographical scope covered by the computer. It can be divided into local area network, urban network, wide area network, wireless network, Internet and other types. When performing network signal connection, uploading, downloading and other transmission operations, it is easy to be interfered by noises such as signals and electromagnetic waves from surrounding electronic components. Both will affect the instability of network signal transmission, so filter components must be installed in the network connector for signal filter processing to reduce noise and electromagnetic wave interference.

In order to solve the problem of noise interference during signal transmission in the network signal processing circuit, the applicant in this case used the existing electronic components and circuit design to carry out research and development and improvement. It has a signal processing circuit on the circuit board, such as As shown in FIG. 10, the processing circuit A has a first connection terminal A1 and a second connection terminal A2, and a coupling module A4 and an anti- Electromagnetic interference module A5, when the external network signal is transmitted to the first connection terminal A1 through the network connector, it can be transmitted to each first capacitor A41 of the coupling module A4 through multiple lines A3 to isolate electricity and couple the signal, and then use the anti-electromagnetic The second capacitors A51 of the interference module A5 absorb the harmonics of the low-frequency part of the signal and guide them to the ground terminal A52 for dissipation, so that the original signal can be almost completely transmitted to the network chip through the coupling module A4 to reduce The attenuation of the signal can also use the second capacitor A51 to absorb the harmonics of the lower frequency part of the frequency band, and then shunt the harmonics of the low frequency part to the ground terminal A52 for release, so as to have the effect of filtering out low frequency noise, but the network frequency is not too high After the signal is transmitted to the network chip, electromagnetic interference with common mode current will be generated due to the potential difference between the two lines A3 and the ground terminal A52, so that the harmonics of the higher frequency part generated by the common mode current in the network signal frequency band cannot be effectively filtered. In addition, it may even cause electromagnetic waves to radiate outward during high-frequency signal transmission, and affect the normal operation of other peripheral electronic equipment, which is the direction that those engaged in this industry need to study and improve urgently.

Therefore, how to solve the troubles and troubles that the network signal processing circuit is disturbed by noise when transmitting network signals, which causes the lack and deficiency of network signal instability, and easily affects network signal attenuation and affects the quality of network signal transmission. It is the direction that those engaged in this industry are eager to improve.

Utility model content

Therefore, in view of the above-mentioned problems and deficiencies, the utility model researchers have collected relevant information, evaluated and considered in many ways, and based on years of experience accumulated in this industry, through continuous trial and modification, they have designed this kind of network The electromagnetic wave (EMI) or noise interference contained in the signal transmission is eliminated, and the circuit for filtering the noise in the network signal is used for the stable transmission of the network signal.

The circuit for filtering noise in the network signal provided by the utility model includes a network chip, a processing circuit and a network connector, wherein:

The network chip includes a pin group with multiple pins;

The processing circuit is electrically connected to the pin group of the network chip, and is provided with one or more than one group of circuit channels electrically connected to each pin of the pin group, between any two adjacent circuit channels Common-mode inductance units are connected in parallel to filter the noise contained in the network signal, and the inductance value of each common-mode inductance unit is between 90 ohms and 1000 ohms, and then adjacent to each common-mode inductance on each circuit channel The sides of the inductance unit are electrically connected with capacitors in series and autotransformers in parallel. The capacitance value of each capacitor is between 0.03μF and 1.0μF, and the inductance value of each variac is between 30μF and 350μF. a resistance value between 0.5 ohms and 2 ohms; and

The network connector is electrically connected to the processing circuit, and is provided with a terminal group respectively electrically connected to each circuit channel and having a plurality of terminal pins.

The main purpose of this utility model is that the noise filtering circuit electrically connects the processing circuit to the network chip and the network connector respectively, and the processing circuit is provided with a circuit channel, and on one or more than one group of circuit channels, respectively electrically Capacitors and autotransformers are connected together, and the common-mode inductance units are electrically connected in parallel on one or more groups of circuit channels between the network chip and the capacitor, and between any two adjacent circuit channels. , can filter out the electromagnetic wave (EMI) or noise and other interference contained in the network signal transmitted in each circuit channel, so as to reduce the interference of the network signal by electromagnetic wave or noise, and achieve the purpose of stabilizing the network signal transmission.

The secondary purpose of the utility model is the common mode inductance unit connected in parallel between any two adjacent circuit channels of the processing circuit, the inductance value of each common mode inductance unit is between 90 ohms (Ω, ohms) ~ 1000 ohms ( Ω, ohms), and according to the different noise conditions when the network signal is transmitted on the processing circuit, the inductance value of the preferred embodiment of the common mode inductor unit can be 800 ohms (Ω, ohms).

Another purpose of this utility model is that the autotransformer connected in parallel between any two adjacent circuit channels of the processing circuit, the inductance value of each variac is between 30μH～350μH, and the DC resistance value (DCR) is between Between 0.5 ohm and 2 ohms (Ω, ohms), while the induction value of the preferred embodiment is 80 μH, and the DC resistance (DCR) is 1 ohm (Ω, ohms).

Another object of the present invention is that each capacitor connected in series between each circuit channel of the processing circuit has a capacitance value between 0.03 μF to 1.0 μF, and a preferred embodiment has a capacitance value of 0.1 μF.

Description of drawings

Fig. 1 is the simple and easy circuit diagram of the present utility model;

Fig. 2 is a block diagram of the utility model;

Fig. 3 is the block diagram of preferred embodiment of the present utility model;

Fig. 4 is the oscillogram of signal frequency and intensity after the processing circuit of the present utility model is processed;

Fig. 5 is the eye diagram of the utility model processing circuit when testing the network;

Fig. 6 is the eye diagram that the utility model processing circuit is too small in the network test inductance value;

Fig. 7 is the eye diagram of the utility model processing circuit when the inductance value of the network test is too large;

Fig. 8 is the eye diagram of the utility model processing circuit when the capacitance value is tested in the network;

Fig. 9 is a simple circuit diagram of another embodiment of the utility model;

FIG. 10 is a circuit diagram of a conventional network signal processing circuit.

Description of reference signs: 1-network chip; 11-pin group; 111-pin; 2-network connector; 21-terminal group; 211-terminal pin; 3-processing circuit; 31-circuit channel; 32-capacitance ;33-autotransformer; 331-grounding side; 4-common mode inductance unit; 5-circuit board; 6-capacitor module; 61-first capacitor; 62-second capacitor; 63-grounding terminal; A-processing circuit A1-first connection terminal; A2-second connection terminal; A3-line; A4-coupling module; A41-first capacitor; A5-anti-electromagnetic interference module;

Detailed ways

In order to achieve the above-mentioned purpose and effect, the technical means adopted by the utility model and its structure, implementation method, etc., the drawings are hereby described in detail with respect to the preferred embodiments of the utility model. Its features and functions are as follows, so that it can be fully understood.

Shown in Fig. 1, 2, 3 are the simplified circuit diagram of the present utility model, block diagram, the block diagram of preferred embodiment respectively, can find out clearly by shown in the figure, the present utility model filters out noise in the network signal The circuit includes a network chip 1, a network connector 2 and a processing circuit 3, wherein:

The network chip 1 has a pin group 11 for transmitting electronic/voltage signals, and the network connector 2 has a terminal group 21 for transmitting electronic/voltage signals, and is electrically connected between the pin group 11 and the terminal group 21. circuit 3, and the processing circuit 3 includes one or more sets of circuit channels 31, each circuit channel 31 is respectively connected with a capacitor 32 in series, and one or more sets of circuit channels between the network chip 1 and the network connector 2 The variacs 33 are electrically connected in parallel to each of the variacs 33, and each of the variacs 33 is electrically connected to the ground side 331, and then a group or a group of circuit channels 31 between each capacitor 32 and the network chip 1 Between any two adjacent circuit channels 31 , the common mode inductance unit 4 is electrically connected in parallel.

And the network chip 1 and the processing circuit 3 of the above-mentioned network signal can be formed on the circuit board 5 in an electrical connection mode, and then electrically connected with the external network connector 2 through the circuit board 5; 2 and the processing circuit 3 are electrically connected and formed on the circuit board 5, and then electrically connected to the external network chip 1 through the circuit board 5; and the circuit board 5 provides the network chip 1, the network connector 2 and the processing circuit 3 Wait for the power required by the circuit, and the circuit board 5 can be provided with a power supply (such as: a dry battery, a rechargeable battery, a lithium battery or a button battery, etc., or be electrically connected to an external power source through a power line, etc., to supply the circuit board 5 required power supply), however, the related network chip 1, network connector 2 and their configuration are prior art, and the detailed composition is not the main point of the utility model of this case, so it will not be described in detail.

The above-mentioned network signal processing circuit 3 is a common-mode inductance unit 4 connected in parallel between any two adjacent circuit channels 31, and the inductance value of the common-mode inductance unit 4 is between 90 ohms (Ω, ohms) and 1000 ohms ( Ω, ohms), and according to the transmission of network signals on each circuit channel 31 of the processing circuit 3, the noise contained in various signals is different, the inductance value of the preferred embodiment of the common mode inductance unit 4 can be 800 ohms (Ω, ohms); and during the signal transmission process of each circuit channel 31 of the processing circuit 3, when other signals enter and generate interference such as electromagnetic waves (EMI) or noise (noise), the common The mold inductance unit 4 can adopt an inductance value of about 800 ohms [(Ω, ohms), but in actual application, the inductance value can also be adjusted according to actual needs or circuit design, thereby improving the stability of high-frequency network signal transmission], Then the main frequency band (CISPR22_CLASS-B, 125MHz) and multiplier frequency band signals of network signals transmitted in each circuit channel 31 will have harmonics of greater strength (dB) (such as 250MHz, 375MHz, 500MHz, 625MHz, 750MHz and other frequency bands) , but it will not exceed the limit range of -4dB, and cause electromagnetic waves (EMI) or noise (noise) to fail to pass through (as shown in Figure 4), so that electromagnetic waves or noise can be transmitted through the capacitors 32 and autotransformers 33 To the ground side 331 to filter out, so as to effectively filter out interference such as electromagnetic waves or noise, and achieve the purpose of stably transmitting network signals in each circuit channel 31 (as shown in FIG. 5 ).

As for the autotransformer 33 connected in parallel between any two adjacent circuit channels 31 of the processing circuit 3, the inductance value of each variac 33 can be between 30 μH～350 μH, and the DC resistance value (DCR) can be 0.5～2 Ohms (Ω, ohms), the induction value of the preferred embodiment is 80 μH, and the DC resistance (DCR) is 1 ohms (Ω, ohms); and each capacitor 32 connected in series between each circuit channel 31 of the processing circuit 3, each The capacitance value of the capacitor 32 can be between 0.03 μF˜1.0 μF, and in a preferred embodiment, the capacitance value can be 0.1 μF.

As shown in Figures 1, 5, 6, 7, and 8, they are the simple circuit diagram of the present utility model, the eye diagram of the processing circuit in the network test, the eye diagram of the processing circuit in the network test inductance value that is too small, and the processing circuit in the network test. The eye diagram when the inductance value is too large, the eye diagram when the processing circuit tests the capacitance value in the network, can be clearly seen from the figure, the processing circuit 3 in the utility model is electrically connected in each circuit channel 31 Each capacitor 32, each coupling transformer 33, and each common mode inductance unit 4, etc. are different according to the nature of the network signal transmission applied, and the capacitance value, inductance value or inductance capacitance value will affect the network signal quality due to the size of the set value. Unstable; if the inductance value of the autotransformer 33 is too small [such as less than 90 ohms (Ω, ohms)], it will cause the signal transmission quality to fail to meet the requirements (IEEE regulations) (as shown in Figure 6, the signal line conflicts upper and lower boundaries); and if the inductance value of the autotransformer 33 is too large, that is, the inductance of the autotransformer 33 has too many windings and the capacitive nature is increased, which will cause excessive attenuation of the network signal, and the quality of the network signal will be reduced. It cannot meet the detection standard (as shown in Figure 7, the signal line will conflict with the central diamond block and the upper and lower boundaries), and cannot filter out interference such as electromagnetic waves (EMI) or noise (noise), which will lead to network signal transmission quality become worse, and cause network signal transmission to be unstable; and each capacitor 32 connected in series with each circuit channel 31 of the network processing circuit 3 will also be unable to filter out interference such as electromagnetic waves or noise because the capacitance value is too low, which will also cause The network signal cannot meet the quality requirements of the detection (as shown in Figure 8, if the bandwidth of the signal line increases, it will violate the boundary between the central diamond-shaped block and the upper and lower blocks), and the detected signal line must surround the central diamond-shaped block. The line cannot touch the diamond-shaped block, but remains parallel to the upper and lower boundaries (as shown in Figure 5), which is a normal signal line that meets the detection standard.

This case is to improve above-mentioned each capacitance 32, the capacitance value or the inductance value of respective coupler transformer 33 because too big or too small, and suffer the electromagnetic wave or noise interference of contained band and be difficult to filter out, promptly in the network signal processing circuit 3 Between any two adjacent circuit channels 31, there are common-mode inductance units 4 connected in parallel respectively, and the optimal inductance value of each common-mode inductance unit 4 is utilized [as shown in Figure 4, the utility model common-mode inductance unit 4 The applied inductance value is about 800 ohms (Ω, ohms) in the preferred embodiment, but in actual application, the inductance value can also be adjusted according to actual needs or circuit design, thereby improving the high-frequency network signal transmission. Stability], and with the application of each capacitor 32 and each coupling transformer 33, the interference such as electromagnetic wave (EMI) or noise (noise) contained in the transmission network signal in each circuit channel 31 is filtered out for network signal The quality of the transmission complies with the requirements of the testing specification (IEEE regulations), so that the network signal transmission is more stable and the quality is better, and the interference of the network chip 1 or various electronic components caused by electromagnetic waves or noise is reduced.

Moreover, the above-mentioned processing circuit 3 uses one end of each circuit channel 31 to be electrically connected to each pin 111 of the pin group 11 of the network chip 1 (each pin 111 can be respectively MD0+, MD0-, MD1+, MD1 -, MD2+, MD2-, MD3+ and MD3- are only used as the numbering of each pin 111, and each numbering can still be changed according to the actual design requirements, not thereby limiting the protection scope of the present utility model); and the processing circuit 3 is used The other end of each circuit channel 31 is electrically connected to each terminal pin 211 of the terminal group 21 of the network connector 2 (each terminal pin 211 can be respectively MX0+, MX0-, MX1+, MX1-, MX2+, MX2-, MX3+ And MX3-, only as the numbering of each terminal pin 211, each numbering can be changed according to the actual design requirements, and it does not limit the scope of protection of the present utility model).

As shown in Figures 1 and 9, they are a simple circuit diagram of the present utility model and a simple circuit diagram of another embodiment, the processing circuit 3 in the present utility model is a group or a group between the network chip 1 and the network connector 2 The above circuit channels 31 are electrically connected in parallel with an autotransformer 33, each circuit channel 31 is connected in series with a capacitor 32, and each of the variacs 33 is electrically connected to the ground side 331, and each capacitor 32 is connected to the ground side 331. In a group or a group of circuit channels 31 between each common-mode inductance unit 4, between any two adjacent circuit channels 31, capacitor modules 6 are electrically connected in parallel, and each capacitor module 6 includes a series The first capacitor 61 and the second capacitor 62 are electrically connected to the ground terminal 63 between the first capacitors 61 and the second capacitors 62 in series, so as to adjust the inductance value of each common mode inductance unit 4, It is used to quickly filter out and discharge the electromagnetic wave and noise and other interference contained in the network signal transmitted in each circuit channel 31 through the first capacitor 61 and the second capacitor 62 of the capacitor module 6 from the ground terminal 63 to the outside. The network signal processing circuit 3 transmits signals more stably, and reduces the interference of the network chip 1 or various electronic components caused by electromagnetic waves or noise.

Therefore, the above description is only a preferred embodiment of the present utility model, and does not limit the protection scope of the present utility model. The circuit of the present utility model for filtering noise in network signals is implemented in the network chip 1 and the network connector 2 The processing circuit 3 is used to electrically connect between them, and the capacitors 32 are connected in series in each circuit channel 31, and between a group or a group of adjacent circuit channels 31 of the processing circuit 3, a common-mode inductance unit 4, Then, the autotransformers 33 are electrically connected in parallel, through the common mode inductance unit 4, the electromagnetic wave (EMI) or noise (noise) contained in the network signal received by the network connector 2 is transmitted through the respective variacs 33 The grounding side 331 is filtered to achieve the purpose of stably transmitting network signals through each circuit channel 31 of the processing circuit 3, reducing external electromagnetic waves or noise and other interference, and reducing the impact on the network chip 1, circuit channels 31 and related electronic components. Functions affected by electromagnetic waves or noise, etc., to prevent the network processing circuit 3 from being affected by interference such as electromagnetic waves or noise, and affecting network signal instability or not meeting the requirements of detection regulations. Therefore, all structures and devices that can achieve the aforementioned effects are Should be covered by the utility model, such simple modifications and equivalent structural changes should be included in the scope of protection of the utility model in the same way, and are hereby stated.

Therefore, the utility model is mainly designed for a circuit that filters out noise in network signals. The processing circuit is electrically connected between the network chip and the network connector, and capacitors are connected in series in each circuit channel of the processing circuit, and any The adjacent circuit channels are connected in parallel with autotransformers and common-mode inductance units, so that the common-mode inductance units can cooperate with each capacitor and each coupling transformer to reduce the electromagnetic wave (EMI) or noise (noise) contained in the network signal. ) and other interferences can be filtered out, and the main protection focus can be achieved to maintain the stable transmission of network signals, avoiding electromagnetic waves or noise and other interferences that cause network chips or related electronic components to be unable to stably process network signals, and only make network signals that can meet The advantages of testing the standard requirements can be used for the purpose of smoother network signal application and more stable data transmission. However, the above is only a preferred embodiment of the utility model, and it does not limit the scope of protection of the utility model. Therefore, all simple modifications and equivalent structural changes made by using the contents of the description and drawings of the utility model should be included in the protection scope of the utility model in the same way, and are hereby declared.

Claims (6)

1. A circuit for filtering noise in network signals, characterized in that it comprises a network chip, a processing circuit and a network connector, wherein: The network chip includes a pin group with multiple pins; The processing circuit is electrically connected to the pin group of the network chip, and is provided with one or more than one group of circuit channels electrically connected to each pin of the pin group, between any two adjacent circuit channels Common-mode inductance units are connected in parallel to filter the noise contained in the network signal, and the inductance value of each common-mode inductance unit is between 90 ohms and 1000 ohms, and then adjacent to each common-mode inductance on each circuit channel The sides of the inductance unit are electrically connected with capacitors in series and autotransformers in parallel. The capacitance value of each capacitor is between 0.03μF and 1.0μF, and the inductance value of each variac is between 30μF and 350μF. a resistance value between 0.5 ohms and 2 ohms; and The network connector is electrically connected to the processing circuit, and is provided with a terminal group respectively electrically connected to each circuit channel and having a plurality of terminal pins. 2. The circuit for filtering noise in network signals according to claim 1, wherein the inductance of the common mode inductor unit is 800 ohms. 3. The circuit for filtering noise in the network signal according to claim 1, wherein the induction value of the autotransformer is 80 μH, and the DC resistance value is 1 ohm. 4. The circuit for filtering noise in network signals according to claim 1, wherein the capacitance of the capacitor is 0.1 μF. 5 . The circuit for filtering noise in network signals according to claim 1 , wherein capacitor modules are respectively connected in parallel between each circuit channel of the processing circuit and between the common-mode inductor unit and each capacitor. 6. The circuit for filtering noise in network signals according to claim 5, wherein each capacitor module includes two first capacitors and second capacitors connected in series, and the first capacitor and the second capacitor are electrically connected respectively. Connect to the ground side.