CN205195674U - Lightning protection and noise filtering circuit of network signal - Google Patents

Abstract

The utility model discloses a lightning protection and noise filtering circuit for a network signal. The circuit utilizes a network signal processing circuit to electrically connect a network chip and a network connector respectively, and the processing circuit is provided with a plurality of circuit channels between the network chip and the network connector, and a capacitor and an autotransformer are electrically connected to one or more circuit channels respectively, and two groups of coil windings are respectively wound on the plurality of autotransformers, wherein one group of coil windings includes a first coil winding and a second coil winding to form a common-mode inductor unit, and the other group of coil windings includes a third coil winding and a fourth coil winding to form an autotransformer, thereby reducing interference of electromagnetic waves or noise on the network signal, and avoiding the situation of instantaneous high voltage when lightning strikes, so as to achieve the purpose of stable transmission of network signals.

Description

Lightning protection and noise filtering circuit for network signal

technical field

The utility model relates to a lightning protection and noise filtering circuit for network signals, which can filter out the noise contained in the network signal transmitted by the network signal processing circuit, and eliminate the high voltage and surge generated at the moment of lightning strike, thereby To achieve the purpose of eliminating noise or high voltage, surge and other interference in the network signal.

Background technique

Nowadays, with the rapid development of computer technology, desktop computers or notebook computers have generally existed in every corner of life, and 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 In the process of development, it will bring people's life, study, work and leisure into another brand-new realm that is different from the past, so that people can transmit required real-time information, advertisements or e-mails to each other through network communication, and at the same time Searching for various information, real-time communication or online games through the Internet makes the relationship between people and the Internet more intense and inseparable.

The network part generally uses two methods of cable connection and wireless transmission to transmit data. The cable connection technology needs to be equipped with a network connector. As the network is used more and more widely, the data capacity transmitted on the network is also increasing. In order to meet the needs of users, manufacturers have been increasing the speed of network transmission, 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, it will cause network signal The network connector connected by wires receives the high-voltage signal generated at the moment of lightning strike, which will cause damage to the electronic components and network chips that are electrically connected to the processing circuit due to the instantaneous high voltage. In addition to causing unstable and interrupted network signal transmission Or it can't be connected at all, and even the circuit board installed on the network chip or the host of the electronic device (such as a computer or sharer, etc.) will be damaged or damaged by the impact of the instantaneous high voltage. According to the geographical scope covered by the computer, the network can be roughly divided into local area network, metropolitan 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 affected by peripheral electronic components. Interference with noise such as signals and electromagnetic waves, which leads to unstable network signal transmission, filter elements, lightning protection devices, and signal coupling devices must be installed in the network connector for signal filtering and lightning protection. High voltage, which can reduce noise, electromagnetic waves or prevent high voltage, surge and other interference caused by lightning strikes at the moment.

Therefore, how to solve the damage of network chips or electronic devices caused by the instantaneous high voltage generated by lightning strikes on the network connector, or the lack and insufficiency of the network signal being interfered by external electromagnetic waves and noise, which will cause the quality of network signal transmission to deteriorate, The troubles and troubles that the transmission content is interrupted or cannot be connected are the directions that those in this industry want to improve.

Utility model content

In view of the above-mentioned problems and deficiencies, the inventor of this case collected relevant information, evaluated and considered in many ways, and based on years of experience accumulated in this industry, after continuous trial and modification, he designed a filter that can filter out network signal transmission. Electromagnetic wave (EMI) or noise interference, etc., and can stably transmit the lightning protection and noise filtering circuit of the network signal of the network signal.

The main purpose of the utility model is that the lightning protection and noise filtering circuit uses the network signal processing circuit to electrically connect the network chip and the network connector respectively, and the processing circuit is provided with multiple circuit channels between the network chip and the network connector , and a capacitor and an autotransformer are electrically connected to one or more groups of circuit channels, and a plurality of autotransformers are respectively wound with two sets of coil windings on the iron core, and one set of coil windings includes The first coil winding and the second coil winding form a common-mode inductance unit, and the other set of coil windings includes the third coil winding and the fourth coil winding, which become an autotransformer, thereby reducing the interference of electromagnetic waves or noise on network signals. , and filter out the instantaneous high voltage and surge generated during lightning strikes, so as to achieve the purpose of stably transmitting network signals.

The secondary purpose of this utility model is that a set of coil windings on the autotransformer includes a first coil winding and a second coil winding, so that the first coil winding and the second coil winding are respectively electrically connected to any two adjacent coil windings. between the circuit channels, and form a common mode inductance unit with an inductance value between 90 ohms (Ω, ohms) and 1000 ohms (Ω, ohms), and the inductance value of its preferred embodiment is 800 ohms (Ω, ohms) ; Another group of coil windings on the autotransformer includes a third coil winding and a fourth coil winding, and is electrically connected to the circuit channel on the adjacent side with the third input end of the third coil winding of each variac, each The third output ends of the third coil windings are respectively electrically connected to the fourth input ends of the fourth coil windings, and then the fourth output ends of the fourth coil windings are respectively electrically connected to the adjacent circuit channel on the other side , then the induction value of each coupling transformer is between 30 μH to 350 μH, and the DC resistance value is 0.5 ohm to 2 ohms (Ω, ohms), and the induction value of the preferred embodiment is 80 μH, and the DC resistance value (DCR) is 1 Ohm (Ω, ohms), and the inductance value of each coupling transformer (ohm) = 2πxFxL, the parameter F is the operating frequency [unit: Hertz (Hz)]; the parameter L is the inductance [unit: microhertz (μH )]; π=3.14159, the autotransformer includes an iron core in the shape of a ring or a rectangular frame, and the first coil winding and the second coil of the two sets of coil windings on each side can be wound on the rectangular frame-shaped iron core Winding, the third coil winding and the fourth coil winding; the processing circuit is electrically connected to the capacitors connected in series on each circuit channel between the adjacent network chip and the respective coupling transformer. In a preferred embodiment, the capacitance value of each capacitor is 0.1μF.

Another object of the present invention is that the noise filtering network chip and processing circuit for lightning protection can be electrically connected to a predetermined circuit board, and then electrically connected to an external network connector through the circuit board; or The network connector and the processing circuit are electrically connected and formed on the circuit board, and then electrically connected to the external network chip through the circuit board; the first wire winding and the second coil winding of a group of coil windings on the autotransformer It can be electrically connected between any two adjacent circuit channels through the circuit layout on the preset circuit board; and the third coil winding of another set of coil windings on the autotransformer passes through the preset circuit with the third input terminal The circuit layout on the board is electrically connected to the adjacent circuit channel on one side, and the third output end of the third coil winding is also electrically connected to the fourth input end of the fourth coil winding through the preset circuit layout on the circuit board. Then it is electrically connected to the ground side through the preset circuit layout on the preset circuit board, and the fourth output terminal of the fourth coil winding is electrically connected to the adjacent circuit channel on the other side through the preset circuit layout on the circuit board .

Another object of the present invention is that the plurality of autotransformers are respectively wound with two sets of coil windings on the iron core, wherein one set of coil windings includes a first coil winding and a second coil winding to form a common mode inductance unit, Another group of coil windings includes the third coil winding and the fourth coil winding, forming an autotransformer, so that the common mode inductance unit and the autotransformer share the same iron core, thereby reducing manufacturing costs and facilitating the assembly of the autotransformer on A group or more than one group of circuit channels of the processing circuit can shorten the processing time, save time and labor, and is more economical.

Description of drawings

Fig. 1 is the circuit block diagram of the present utility model;

Fig. 2 is a simple circuit diagram of the utility model;

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

Fig. 4 is a circuit diagram of the autotransformer in the utility model.

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-signal Coupling capacitor; 4-autotransformer; 41-iron core; 42-coil winding; 420-common mode inductance unit; 421-first coil winding; 4211-first input terminal; 4212-first output terminal; 422-the first Second coil winding; 4221-second input terminal; 4222-second output terminal; 43-coil winding; 431-third coil winding; 4311-third input terminal; 4312-third output terminal; 432-fourth coil winding ; 4321-the fourth input terminal; 4322-the fourth output terminal; 44-the ground side; 5-the circuit board.

detailed description

In order to achieve the above-mentioned purpose and effect, the technical means adopted by the utility model, its structure, and the method of implementation, etc., are hereby drawn to illustrate in detail the features and functions of the preferred embodiments of the utility model as follows.

As shown in Fig. 1, Fig. 2, Fig. 3, and Fig. 4, they are respectively a circuit block diagram of the utility model, a simple circuit diagram, a circuit diagram of a preferred embodiment, and a circuit diagram of an autotransformer, which can be clearly shown in the figure It can be seen that the lightning protection and noise filtering circuit for network signals provided by the utility model 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 a processing circuit is electrically connected between the pin group 11 and the terminal group 21 3, and the processing circuit 3 includes one or more groups of circuit channels 31, each circuit channel 31 is electrically connected with a signal coupling capacitor 32, and a group or a group between the network connector 2 and the signal coupling capacitor 32 More than one group of circuit channels 31 are electrically connected to autotransformers 4 in parallel, and each variac 4 winds two sets of coil windings 42, 43 on the iron core 41, and one set of coil windings 42 includes the first coil winding 421 and the second coil winding 422, the first coil winding 421 is electrically connected to the adjacent circuit channel 31 in series with the first input terminal (A+) 4211 and the first output terminal (A-) 4212, and the second coil The winding 422 is electrically connected to another adjacent circuit channel 31 in series with the second input terminal (B+) 4221 and the second output terminal (B-) 4222, so that the first coil winding 421, the second coil winding 422 Respectively electrically connected to any two adjacent circuit channels 31 to form a common mode inductance unit 420; another coil winding 43 includes a third coil winding 431 and a fourth coil winding 432, the third coil winding 431 of the coil winding 43 The third input end 4311 (A+) of the third coil winding 431 is electrically connected to the adjacent circuit channel 31, and the third output end 4312 (A-) of the third coil winding 431 is electrically connected to the fourth input end 4321 of the fourth coil winding 432 (B+) is then electrically connected to the ground side 44, and is electrically connected to another adjacent circuit channel 31 with the fourth output end 4322 (B-) of the fourth coil winding 432 to form a loop of the autotransformer 4 The autotransformer 4 winds two groups of coil windings 42 on the iron core 41 simultaneously, wherein one group of coil windings 42 constitutes a common-mode inductance unit 420, and the other group of coil windings 43 constitutes the loop of the autotransformer 4 to achieve a common The purpose of the mode inductance unit 420 and the autotransformer 4 sharing the same iron core 41 is to reduce the cost of manufacturing the common mode inductance unit 420 and the autotransformer 4, and to facilitate the assembly of the autotransformer 4 in a group or a group of the processing circuit 3 There are 31 circuit channels above the group, which can shorten the time of processing operations, save time and labor, and is more in line with economic benefits.

Moreover, the network chip 1 and the processing circuit 3 of the above-mentioned network signal can be electrically connected and formed on the circuit board 5, and then electrically connected to the external network connector 2 through the circuit board 5; the network connector 2 and the processing circuit can also be connected The circuit 3 is formed on the circuit board 5 in an electrically connected manner, and then electrically connected to the external network chip 1 through the circuit board 5; The required power supply, 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 a power supply that is electrically connected to an external mains through a power line, to supply the circuit board 5 Required power supply), the relevant network chip 1, network connector 2 and their configuration are prior art, and the detailed structure is not the main point of the present utility model, so it will not be described in detail.

In addition, the 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 MX3- are only used as the numbering of each pin 111, and each numbering can still be changed according to the actual design requirements, and the scope of protection of the utility model is not limited for this reason); and the processing circuit 3 utilizes each circuit channel 31 The other end 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 MD3-, only as each The numbering of the terminal pins 211 can be changed according to the actual design requirements, and the protection scope of the present utility model is not limited thereto).

In addition, the above-mentioned respective coupling transformers 4 can wind two sets of coil windings 42, 43 on the iron core 41, wherein the first coil winding 421 and the second coil winding 422 of one set of coil windings 42 can combine the first coil winding 421 with The first input terminal (A+) 4211 and the first output terminal (A-) 4212 are electrically connected to the adjacent circuit channel 31 through the preset circuit layout on the circuit board 5, and the second coil winding 422 is connected to the second input terminal (B+) 4221 and the second output terminal (B-) 4222 are also electrically connected to another adjacent circuit channel 31 by using the preset circuit layout on the circuit board 5, so that the first coil winding 421, the second coil winding 422 are respectively electrically connected to any two adjacent circuit channels 31 through the preset circuit layout on the circuit board 5 to form a common mode inductance unit 420, and the inductance value of the common mode inductance unit 420 is between 90 ohms (Ω, ohms)～1000 ohms (Ω, ohms), and when network signals are transmitted on each circuit channel 31 on the network signal processing circuit 3, the noises contained in various signals are different, and the common mode inductance unit 420 The inductance value of the preferred embodiment can be 800 ohms (Ω, ohms); and during the signal transmission process of each circuit channel 31 of the processing circuit 3, other signals enter to generate electromagnetic waves (EMI) or noise (noise), etc. In the case of interference, the inductance value of the common-mode inductance unit 420 can be about 800 ohms [(Ω, ohms), but in actual applications, the inductance value can also be adjusted according to actual needs or circuit design, thereby improving the high-frequency network Stability during signal transmission], then the network signal main frequency band (CISPR22_CLASS-B, 125MHz) and the multiplier frequency band 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 will not exceed the limit range of -4dB, and cause electromagnetic waves (EMI) or noise (noise) to fail to pass through, so that electromagnetic waves or noise and other interference can be effectively filtered; and two sets of coil windings 42 The first input end 4211 (A+) of the first coil winding 421 is electrically connected to the adjacent circuit channel 31, and the first output end 4212 (A-) of the first coil winding 421 passes through the preset circuit on the circuit board 5 After the layout is electrically connected to the second input terminal 4221 (B+) of the second coil winding 422, it is then electrically connected to the ground side 44 through the preset circuit layout of the circuit board 5, and the second output of the second coil winding 422 The end 4222 (B-) is electrically connected to another adjacent circuit channel 31 through the preset circuit layout of the circuit board 5, so that the third coil winding 431 and the fourth coil winding 432 of the coil winding 43 cooperate with the circuit board 5. The preset circuit layout forms the loop of the autotransformer 4 .

Each coupling transformer 4 composed of the third coil winding 431 and the fourth coil winding 432 of the coil winding 43 has a low resistance value (about 0.1Ω～10Ω) inside, and the instantaneous high voltage generated by the lightning strike can reach several KV (kilovolts), then the instantaneous high voltage, surge, etc. of the lightning strike can be transmitted to the respective variacs 4 via the circuit channel 31, that is, the third coil winding 431 and the fourth coil winding 432 of the autotransformer 4 are wound in series. Winding on the iron core 41, the instantaneous high voltage is transmitted to the ground side 44, and the high voltage is stepped down and buffered, and the network signal in each circuit channel 31 is separated from the instantaneous high voltage through the respective coupling transformer 4, so that the instantaneous high voltage will not be caused. The voltage and the network signal cancel each other, so that after the instantaneous high voltage is transmitted to the ground side 44, it will not affect the network signal transmission between each circuit channel 31, and can make each circuit channel 31 transmit the network signal stably. Reduce the instantaneous high voltage of lightning strikes to cause instability or interruption of the transmitted network signal, and will not damage the network system, and then detect it through the network simulation lightning strike generator to explain the obtained data, among which:

The DC filter circuit currently used in network lines can be used to filter out DC and low-frequency noise, and DC and low-frequency noise, such as static electricity or lightning strikes, are generated by surges, which are extremely short-duration and low-frequency signals. As for the surge generated by static electricity or lightning, its amplitude is about thousands of volts (Volt), the frequency is about 1kHz~1MHz, and the voltage rise time (RiseTime) is about 1~10 microseconds (μs). However, network power For high-speed electrical connectors such as connectors, the transmission speed is mostly between 10Mb/s and 1Gb/s, and the frequency of the corresponding transmission signal is between 2.5MHz and 125MHz, which is far more than 1MHz. Therefore, the DC high-pass filter circuit can be Set a frequency threshold, such as 1MHz, and only let the signal with a frequency exceeding the threshold pass through to filter out low-frequency signals. For the instantaneous high voltage impact generated by lightning strikes, it is detected according to the IEC60950-4-5 specification For the lightning strike generator, when using the 10/700 lightning strike waveform, its internal resistance value is about 15Ω, and the external resistance of the lightning strike generator must be equal to 25Ω. It is composed of eight lines, and each line is connected in series with eight 200Ω resistors (eight 200Ω resistors are connected in parallel to become an external 25Ω equivalent resistance). For example, when the lightning generator generates 6KV (kilovolt) The high voltage (low-frequency direct current) is stepped down through the autotransformer 4 (which can have a resistance value of 0.1Ω～10Ω, and the preset better resistance value can be 1Ω), and the calculation formula is:

6KV/(15+200+1)X1Ω (preferably preset resistance value of autotransformer 4 is 1Ω)≒27.778V.

Then, the lightning strike received by the network connector 2 is stepped down and buffered to 27.778V by the low resistance value of the autotransformer 4, and the remaining large voltage values (about 5.97KV) are electrically connected to the ground side 44 filter through the respective variac 4. Except, on the network processing circuit 3 processed by the autotransformer 4, there is only a residual voltage value of 27.778V, which is the voltage value that the network processing circuit 3 can withstand [the network line can withstand about tens to hundreds of volts (V) Voltage value, the network processing circuit 3 uses a signal coupling capacitor 32 of 0.1 μF, which can withstand a voltage of about 50V], that is, the instantaneous high voltage of the network connector 2 when it is subjected to a lightning strike can pass through a set of coil windings 43 of the autotransformer 4 The third coil winding 431 and the fourth coil winding 432 are wound on the autotransformer 4 in a series connection, which can step down and buffer the instantaneous high voltage caused by lightning strikes. When the instantaneous high voltage enters the network through the network connector 2 In each circuit channel 31 of the processing circuit 3, the instantaneous high voltage is transmitted to the ground side 44 through the respective coupling transformers 4 between each circuit channel 31 with the third coil winding 431 and the fourth coil winding 432, thereby the instantaneous high voltage and The network signals in each circuit channel 31 are separated, and each coupling transformer 4 will not allow the network signal to be offset by the instantaneous high voltage, that is, the instantaneous high voltage will not be transmitted to each pin of the corresponding pin group 11 of the network chip 1 111, preventing the instantaneous high voltage generated by the lightning strike from causing damage, damage or attenuation of the network signal to the processing circuit 3 and the network chip 1, etc., so that each circuit channel 31 can continue to transmit the network signal stably without causing network signal interruption or Unstable phenomena such as pauses occur, making network signal transmission smooth and improving the quality of network signal transmission.

In addition, the third coil winding 431 and the fourth coil winding 432 of a group of coil windings 43 wound on the iron core 41 by each variac 4 are electrically connected by the third input end 4311 (A+) of the third coil winding 431. Connected to the adjacent circuit channel 31, the third output terminal 4312 (A−) of the third coil winding 431 is electrically connected to the fourth input terminal 4321 (B+) of the fourth coil winding 432 and then electrically connected to the ground side 44 , and the fourth output terminal 4322 (B-) of the fourth coil winding 432 is electrically connected to another adjacent circuit channel 31 to form a loop of the autotransformer 4, and when the circuit channel 31 of the processing circuit 3 is applied When the network signal is transmitted (that is, the transmission of alternating current), the inductance of the autotransformer 4 can be between 40 μH～800 μH (micro Henry) according to different strokes (the inductance value of the preferred embodiment can be 80 μH), If calculated based on the equivalent impedance value, when the equivalent impedance value is 100MHz, the value of the autotransformer 4 can be between 200 ohms (Ω) and 10,000 ohms (Ω), then the frequency band line transmitted in the network In general, the impedance presented will not affect the transmission of network signals. Generally, the signal transmission volume of 10M, 100M or 1G of network signals can pass through the processing circuit smoothly, without causing interruption, suspension or attenuation of network signals, so that it will not Interference or influence by the autotransformer 4, and the inductance value of the autotransformer 4 can be calculated by the following formula:

Inductive reactance (ohm) = 2πxFxL

Among them: the parameter F is the working frequency [unit: Hertz (Hz)]; the parameter L is the inductance [unit: Henry (μH)], π=3.14159.

If taking the network signal (high frequency signal) as an example, its operating frequency (F) is 10,000,000Hz, and the inductance (L) is 80μH, and the inductance value of the autotransformer 4 is calculated, then the autotransformer 4 The inductive reactance value is: 2x3.14159x10,000,000x80=50,265.44 ohms (ohms)≒50K ohms (ohms).

When the instantaneous high voltage (10μs+700μs≒1mμs≒1KHz＝F) is generated due to the lightning strike (low frequency signal) on the network (when using 10/700 lightning strike waveform), through the autotransformer 4 Inductance (L=80μH) and the inductive reactance value of the autotransformer 4 can be obtained: 2x3.14159x1, 000x80=5.026544 ohms (ohms)≒5 ohms (ohms) equivalent impedance [the value of the autotransformer 4 can be between 200 ohms (Ω) and 10,000 ohms (Ω)], then the instantaneous high voltage generated by the lightning strike can be known from the above formula, the inductance is proportional to the operating frequency and the inductance value, so in When the working frequency of the signal increases, its inductive reactance will also increase, but the increase in inductive reactance will increase the attenuation of the signal, so there will be network disconnection or slow network transmission speed. After the coupling buffer of the coupling transformer 4, the inductive reactance value can be effectively reduced (reducing the inductive reactance value to about 5 ohms (ohms)), which can effectively reduce the attenuation degree of the signal, thereby preventing network signal transmission from being attenuated and interrupted or paused. The stable phenomenon can avoid the interruption or suspension of the network signal transmission of each circuit channel 31 due to the lightning strike, so that each circuit channel 31 can still transmit the network signal smoothly without being affected by the lightning strike.

A plurality of autotransformers 4 wind two groups of coil windings 42, 43 on the iron core 41, wherein the first coil winding 421 and the second coil winding 422 of one group of coil windings 42 form a common mode inductance unit 420; and the other group The third coil winding 431 and the fourth coil winding 432 of the coil winding 43 form the loop of the autotransformer 4, because the common-mode inductance unit 420 formed by one group of coil windings 42 and the autotransformer formed by the other group of coil windings 43 are respectively For different frequency circuit signal processing modes, the common-mode inductance unit 420 of one set of coil windings 42 is used to filter out external electromagnetic waves or noises received by high-frequency network signals, and the other set of coil windings 43 is used for autotransformer 4 To prevent lightning strikes from high-frequency instantaneous high voltage, surge and other interference, the two sets of coil windings 42 and 43 respectively perform network signal processing in different frequency bands, so that two sets of coil windings are simultaneously wound on the iron core 41 of the autotransformer 4 42, 43 will not form mutual interference, conflict and other phenomena; then the autotransformer 4 can filter out high-frequency network signal electromagnetic waves, noise and other interference and low-frequency lightning strike signal instantaneous high voltage, surge, then can reach the network The signal processing circuit 3 is not subject to external noise, electromagnetic waves or lightning strikes with multiple protection effects such as instantaneous high voltage and surge interference. After the network connector 2 receives external network signals, it passes through the autotransformer 4 of the processing circuit 3 and The signal coupling capacitor 32 performs lightning protection and noise filtering processing for network signals, thereby transmitting stable network signals to the network chip 1, ensuring that network signal transmission is not prone to interruption or suspension, making network signal applications smoother, and It can improve the quality of network signal transmission.

The above description is only a preferred embodiment of the present utility model, and does not limit the scope of protection of the present utility model. The lightning protection and noise filtering circuit of the network signal provided by the present utility model is implemented in the network chip 1 and the network connector 2 The processing circuit 3 is used to electrically connect between them, so that the signal coupling capacitors 32 are respectively connected in series to each circuit channel 31, and an autotransformer is electrically connected between a group or a group of adjacent circuit channels 31 of the processing circuit 3. 4. The autotransformer 4 winds two sets of coil windings 42, 43 on the iron core 41, so that a common mode inductance unit 420 is formed by a set of coil windings 42, and the network signal received by the network connector 2 can be transferred Electromagnetic waves (EMI) or noise (noise) etc. are filtered through the ground side 44 of each variac 4, and then another set of coil windings 43 are used to form the autotransformer 4 circuit, which can filter out instantaneous high voltage, surge, etc. during lightning strikes Interference, so that each circuit channel 31 of the processing circuit 3 is free from interference such as lightning and noise, and then can stably transmit network signals, reduce interference such as external electromagnetic waves or noise, and reduce the number of network chips 1, circuit channels 31 and related electronic devices. The zero components are affected by the instantaneous high voltage, surge or electromagnetic wave, noise, etc. of lightning strikes, so as to prevent the network processing circuit 3 from being subjected to lightning strikes, electromagnetic waves, noise, etc., and use the common mode inductance unit 420 to share the same iron core with the autotransformer 4 The mode of 41 can reduce the manufacturing cost, so all structures and devices that can achieve the aforementioned effects should be covered by the utility model, and such simple modifications and equivalent structural changes should be included in the scope of protection of the utility model in the same way , together with Chen Ming.

The utility model is mainly designed for the anti-lightning device of the network signal processing circuit. The processing circuit is electrically connected between the network chip and the network connector, and each circuit channel of the processing circuit is electrically connected to the signal coupling capacitor and then electrically connected. The autotransformer is directly connected to the autotransformer, and the autotransformer winds two sets of coil windings on the iron core, and one set of coil windings forms a common mode inductance unit, and the other set of coil windings forms the loop of the autotransformer, thereby filtering out the network The instantaneous high voltage generated by the signal receiving lightning strike and the electromagnetic wave noise contained in the network signal, etc., prevent the impact and damage of the network chip or related electronic components caused by the instantaneous high voltage, and avoid interference by electromagnetic wave noise, so that the network signal can be avoided. The effects of lightning strikes and noise can make the application of network signals smoother and data transmission uninterrupted or suspended, and the common-mode inductor unit and autotransformer share the same iron core, which can reduce manufacturing costs.

Claims (8)

1. A kind of anti-lightning strike and noise filter circuit of network signal, it comprises network chip, processing circuit and network connector, it is characterized in that: 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 circuit channels electrically connected to each pin of the pin group, and electrically connected to any two adjacent circuit channels respectively. There are autotransformers connected to each other, and two sets of coil windings are respectively wound on the multiple autotransformers, and one set of coil windings on each variac includes a first coil winding and a second coil winding for the first coil winding The second coil windings are respectively electrically connected between any two adjacent circuit channels to form a common-mode inductance unit with an inductance value ranging from 90 ohms to 1000 ohms. The other set of coil windings on each coupling transformer includes a third The coil winding and the fourth coil winding are electrically connected to the circuit channel on the adjacent side with the third input end of the third coil winding of each variac, and the third output ends of each third coil winding are respectively electrically connected to The fourth input end of each fourth coil winding is electrically connected to the adjacent circuit channel on the other side with the fourth output end of each fourth coil winding respectively, so the inductance value of the autotransformer is between 30 μH ~ 350 μH, And the DC resistance value is 0.5 ohm ~ 2 ohm, and then each circuit channel between the adjacent network chip and each coupling transformer is electrically connected in series with capacitors, and the capacitance value of each capacitor is between 0.03 μF ~ 1.0 μF; 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 lightning protection and noise filtering circuit of network signal according to claim 1, characterized in that, the first coil winding of a group of coil windings on the plurality of autotransformers is connected to the first input terminal, the first The output end is electrically connected to the adjacent circuit channel in series, and the second coil winding is electrically connected in series to the adjacent circuit channel on the other side through the second input end and the second output end. 3. The lightning protection and noise filtering circuit for network signals according to claim 1, wherein the inductance value of the common-mode inductance unit formed by the first coil windings and the second coil windings of the plurality of autotransformers into 800 ohms. 4. The lightning protection and noise filtering circuit of network signal according to claim 1, characterized in that, the induction value of the third coil winding and the fourth coil winding of the plurality of autotransformers is 80 μH, and the DC resistance The value is 1 ohm, and the inductance value of each coupling transformer is 2πxFxL, the parameter F is the working frequency; the parameter L is the inductance; π=3.14159. 5. The lightning protection and noise filtering circuit for network signals according to claim 1, characterized in that, each circuit channel between the adjacent network chip and each coupling transformer is electrically connected to the capacitor of the capacitor connected in series The value is 0.1µF. 6. The lightning protection and noise filtering circuit for network signals according to claim 1, wherein the plurality of autotransformers comprise a rectangular frame-shaped iron core and are wound on each side of the rectangular frame-shaped iron core The first coil winding, the second coil winding, the third coil winding and the fourth coil winding of the two sets of coil windings. 7. The lightning protection and noise filtering circuit for network signals according to claim 1, wherein the network chip and the processing circuit are electrically connected and formed on a predetermined circuit board, and then electrically connected through the circuit board. Connect to an external network connector; or form the network connector and processing circuit on the circuit board in an electrically connected manner, and then electrically connect to the external network chip through the circuit board. 8. The lightning protection and noise filtering circuit for network signals according to claim 1, characterized in that, the first coil winding of one of the coil windings in the two groups of coil windings of the plurality of autotransformers passes through Assuming that the circuit layout on the circuit board is electrically connected to the adjacent circuit channel, the second coil winding is also electrically connected to the adjacent circuit channel on the other side through the preset circuit layout; the other set of coil windings The third input end of the third coil winding is electrically connected to the adjacent circuit channel on one side through the circuit layout on the preset circuit board, and the third output end of the third coil winding is also through the circuit layout on the preset circuit board Electrically connected to the fourth input end of the fourth coil winding and then electrically connected to the ground side through the predetermined circuit layout of the predetermined circuit board, and the fourth output end of the fourth coil winding passes through the predetermined circuit layout of the circuit board Electrically connected to the adjacent circuit channel on the other side.