JP3202758U - Lightning strike prevention device for network signal processing circuit - Google Patents

Abstract

A lightning strike prevention device for a network signal processing circuit is provided. A lightning protection device for a network signal processing circuit comprising a network chip, a processing circuit, and a network connector for transmitting signals, wherein a plurality of circuit channels of the processing circuit are connected between the chip and the connector, A signal coupling capacitor 32 is connected to each adjacent one or more circuit channels, and the autotransformer 4 is connected in parallel between one or more adjacent circuit channels between the capacitor and the connector, Each autotransformer winds two coil windings 42 around a core 41 and connects the first input end 4211 of the first coil winding 421 to a circuit channel adjacent to one side. The first output end 4212 of the first coil winding is connected to the ground side 43 after being connected to the second input end 4221 of the second coil winding 422, and the second output end 4222 of the second coil winding is the other side. And the adjacent circuit channel, the high voltage generated when the connector is subjected to a lightning strike is filtered using each autotransformer. [Selection] Figure 2

Description

  The present invention relates to a structure of a lightning strike prevention device for a network signal processing circuit, and more particularly to a lightning strike prevention device that reduces a high voltage generated at the moment when a network connector receives a lightning strike. A network signal that reduces high voltage generated at the moment of a lightning strike by electrically connecting a single-turn transformer to one or more circuit channels through a processing circuit between the network chip and the network connector. The present invention relates to a structure of a lightning strike prevention device for a processing circuit.

  At present, computer technology is rapidly developing, and desktop computers or laptop computers are no longer commonly used in various places in society. The trend of computer development is to improve the calculation function, speed, and downsizing. Network communication technology is also rapidly developing, leading people's life, learning, work and entertainment to a novel world, and using network communication between people, instantly necessary information, advertisements, or email exchange And so on. In addition, by searching various information, performing real-time communication, or online games via the network, the relationship between people and the network is a close relationship that cannot be separated.

However, the network transmits data using two methods such as cable connection and wireless connection. Cable connection technology requires the installation of a network connector. As the operation of the network becomes more and more widespread, the amount of data transmitted using the network is also increasing, and network operators have increased the transmission speed of the network from 10 Mbps to 100 Mbps or 1 Gbps in order to meet the needs of users. The transmission speed of current optical cable networks can reach 10 Gbps or higher.
However, when the network signal is subjected to a lightning strike, the network connector connected to the network signal cable receives the high voltage signal instantly after the lightning strike, and each electronic component electrically connected to the processing circuit by the instantaneous high voltage, The network chip is damaged. Network signal transmission is unstable, interrupted, or cannot be completely connected.
Alternatively, a circuit board installed in a network chip or a main board of an electronic device (for example, a computer, a hub, etc.) may be damaged or damaged due to an instantaneous high voltage shock. In general, the type of network is based on the geographical area covered by the computer, and roughly includes a local area network, a metropolitan area network, a wide area network, a wireless network, and the Internet. When performing transmission work such as connecting, uploading, and downloading network signals, it is easily affected by signals from nearby electronic components, electromagnetic interference, and surge phenomena (such as lightning strikes) that occur in the signal. Therefore, it is necessary to reduce noise, electromagnetic waves, and surge interference by installing a filter component in the network connector and performing signal filtering processing.
However, instantaneous high voltage shocks caused by lightning strikes cannot be completely filtered, and electronic circuits and components such as network lines and network chips may be destroyed.

  Therefore, the high voltage generated at the moment when the network connector receives a lightning strike breaks the network chip or the electronic device, and the transmission quality of the network signal deteriorates, so that the transmission content is interrupted or cannot be connected. In order to do this, further improvements were necessary.

Utility Model Registration No. 3195228

  In order to solve the drawbacks of the known structure, the present invention installs a lightning strike prevention device for a network signal processing circuit. A first object of the present invention is that the lightning strike prevention device uses a processing circuit and is electrically connected to a network chip and a network connector, respectively. The processing circuit between the network chip and the network connector has a plurality of circuit channels, and is electrically connected to the signal coupling capacitor on each adjacent set or one or more sets of circuit channels. Between the ring capacitor and the network connector, each pair of adjacent circuit channels is electrically connected to the autotransformer in a parallel manner. Each autotransformer is electrically connected to the ground side, and when the network connector changes due to a momentary high voltage caused by lightning strike, each autotransformer is used to filter the high voltage An object of the present invention is to provide a structure of a lightning strike prevention device for a network signal processing circuit that reaches an object.

  The second object of the present invention is that the autotransformer winds two coil windings on a core, and the core can be shaped like a circle or a rectangle. The first input end (A +) of the first coil winding of the two coil windings is electrically connected to the adjacent circuit channel. The first output end (A−) of the first coil winding is electrically connected to the ground side after being electrically connected to the second input end (B +) of the second coil winding. In addition, the second output terminal (B-) of the second coil winding is electrically connected to another adjacent circuit channel, so that the structure of the lightning strike prevention device of the network signal processing circuit forming the circuit of the autotransformer 4 can be obtained. It is to provide.

  In order to solve the above-mentioned object, the present invention provides a lightning strike prevention device structure of a network signal processing circuit. A first object of the present invention is that the lightning strike prevention device uses a processing circuit and is electrically connected to a network chip and a network connector, respectively. The processing circuit between the network chip and the network connector has a plurality of circuit channels, and is electrically connected to the signal coupling capacitor on each adjacent set or one or more sets of circuit channels. Between the ring capacitor and the network connector, each pair of adjacent circuit channels is electrically connected to the autotransformer in a parallel manner. Each autotransformer is electrically connected to the ground side, and when the network connector changes due to a momentary high voltage caused by lightning strike, each autotransformer is used to filter the high voltage Reach the goal.

  In order to solve the second object, the self-winding transformer has two coil windings wound around a core, and the core can be formed into a circular shape or a rectangular shape. The first input end (A +) of the first coil winding of the two coil windings is electrically connected to the adjacent circuit channel. The first output end (A−) of the first coil winding is electrically connected to the ground side after being electrically connected to the second input end (B +) of the second coil winding. Further, the second output terminal (B−) of the second coil winding is electrically connected to another adjacent circuit channel to form a circuit of the autotransformer 4.

  The structure of the lightning strike prevention device of the network signal processing circuit according to the present invention can filter the instantaneous high voltage generated when a lightning strike occurs. Therefore, the high voltage generated at the moment when the network connector receives a lightning strike prevents the network chip or the electronic device from being destroyed, the transmission quality of the network signal is deteriorated, and the transmission content is interrupted or cannot be connected. be able to.

It is a circuit block diagram of the present invention. It is a simplified circuit diagram of the present invention. It is a circuit block diagram of the best embodiment of the present invention. It is a circuit diagram of the autotransformer of this invention.

  Hereinafter, the structure, features, and effects of the present invention will be described in detail with reference to the best embodiments and drawings.

  FIG. 1, FIG. 2, FIG. 3 and FIG. 4 are a circuit block diagram, a simplified circuit diagram, a circuit block diagram of the best embodiment, and a circuit diagram of the autotransformer according to the present invention. As can be seen, the network signal processing circuit of the present invention includes a network chip 1, a network connector 2, and a processing circuit 3 that is electrically connected between the network chip 1 and the network connector 2.

The network chip 1 has a pin group 11 for transmitting an electronic / voltage signal. The network connector 2 has a terminal group 21 for transmitting electronic / voltage signals. Further, the processing circuit 3 is electrically connected between the pin group 11 and the terminal group 21, and the processing circuit 3 includes one or more sets of circuit channels 31, and each circuit channel 31 includes a signal coupling capacitor. 32 is electrically connected. The autotransformer 4 is electrically connected in a parallel manner between the network 2 and the signal coupling capacitor 32 and between one or more sets of circuit channels 31.
Each autotransformer 4 winds two coil windings 42 on a core 41. The first input terminal 4211 (A +) of the first coil winding 421 of the two coil windings 42 is electrically connected to the adjacent circuit channel 31. The first output end 4212 (A−) of the first coil winding 421 is electrically connected to the ground side 43 after being electrically connected to the second input end 4221 (B +) of the second coil winding 422. In addition, the second output end 4222 (B−) of the second coil winding 422 is electrically connected to another adjacent circuit channel 31 to form a circuit of the single-turn transformer 4.

In addition, the network chip 1 and the processing circuit 3 for the network signal described above can be formed on the circuit board 5 by an electrical connection method. Further, it is electrically connected to the external network connector 2 via the circuit board 5. Further, the network connector 2 and the processing circuit 3 are formed on the circuit board 5 by an electrical connection method, and further electrically connected to the external network chip 1 through the circuit board 5. The circuit board 5 is used to supply power necessary for circuits such as the network chip 1, the network connector 2, and the processing circuit 3.
In addition, the circuit board 5 is supplied with a power source (for example, a dry battery, a rechargeable battery, a lithium battery, a button battery, or the like, or a power source required by the circuit board 5 is connected to an external AC power source via a power cable) Can be installed. However, the arrangement of the network chip 1 and the network connector 2 is a conventional technique, and the detailed configuration is not the focus of the present invention, and thus will not be described here.

  Further, each of the above-described single-winding transformers 4 winds two coil windings 42 on the core 41, and the first input end 4211 (A +) of the first coil winding 421 of the two coil windings 42 is It is electrically connected to the adjacent circuit channel 31. The first output end 4212 (A−) of the first coil winding 421 is electrically connected to the second input end 4221 (B +) of the second coil winding 422 by a circuit layout method installed on the circuit board 5. Further, it is electrically connected to the ground side 43 by a circuit layout installed on the circuit board 5. The second output end 4222 (B−) of the second coil winding 422 is electrically connected to another adjacent circuit channel 31 via the circuit layout installed on the circuit board 5, so that the two coil windings 42 are connected to each other. The circuit of the autotransformer 4 is formed in accordance with the circuit layout installed on the substrate 5.

Since the above-described network chip 1 is a voltage mode chip, the network chip 1 supplies a drive voltage to the processing circuit 3 and changes together with the voltage when transmitting a signal. In this case, the electric resistance is provided from the signal coupling capacitor 32 so that a voltage is generated and the signal is transmitted. Since the network chip 1 using the voltage mode does not need to be provided with an electrical resistance, it is only necessary to install a signal coupling capacitor 32 in each circuit channel 31 of one or more processing circuits 3.
The characteristic of the signal coupling capacitor 32 is that, when the supply voltage flows to the first end, a transient charge of a single polarity (positive charge, etc.) is generated at the first end, and the second of the coupling capacitor 32 is generated. At the two ends, transient charges of another polarity (such as negative charges) are generated.

  When the supply of the positive charge to the first end of the signal coupling capacitor 32 is stopped after the predetermined time has elapsed, the second end of the signal coupling capacitor 32 causes the signal cup to flow when the negative charge flows along the circuit channel 31. Reach the transmission effect of the ring. At the same time, since the signal coupling capacitor 32 does not directly pass the signal through the circuit channel 31, the effect of preventing the backflow of current is reached. However, since the speed at which the signal coupling capacitor 32 performs charging / discharging is related to the time constant, it is possible to supply signal transmission that is just right for the charging / discharging time only by combining the time constant and the signal cycle. Will not be interrupted. As the electric capacity of the signal coupling capacitor 32 increases, the time constant also increases accordingly. Therefore, the electric capacity of the signal coupling capacitor 32 is 100 μF to 0.01 μF, and the best electric capacity of the signal coupling capacitor 32 is 0. .1 μF.

  The processing circuit 3 described above couples the circuits at both ends by the signal coupling capacitor 32 connected on each circuit channel 31. The resistance of the capacitance (Z) is called reactance, the unit is ohm (Ω), and the formula of reactance is as follows.

  Z = 1 / (2π * f * C)

In the above formula, f is a frequency and the unit is Hertz (Hz). C is the capacitance value of the capacitor, and its unit is microfarad (μF).
Since capacitance is exploited to isolate electricity and couple signals, the reactance, operating frequency and capacitance value are inversely proportional, as can be seen from the above formula. Therefore, in the situation where the signal coupling capacitor 32 having the same capacitance value is used and the signal frequency is increased, the reactance is reduced accordingly, and if the signal attenuation is weakened, the network has a good network online. And the signal transmission speed is also increased. Capacitance takes advantage of the characteristic that the strength increases with frequency, and the current network frequency (bandwidth) becomes higher (greater than 1 Gbps). Signal coupling is performed by electric field induction formed by isolating DC current. In addition, the characteristics of the signal coupling capacitor 32 and the coupling effect of the high-frequency network signal are enhanced accordingly.

  Further, the processing circuit 3 uses one end of each circuit channel 31 to electrically connect to each pin 111 of the pin group 11 of the network chip 1. (Each pin 111 can be divided into MD0 +, MD0-, MD1 +, MD1 +, MD2 +, MD2-, MD3 + and MX3-, respectively, which is a symbol only for distinguishing each pin 111. The processing circuit 3 uses the other end of each circuit channel 31 to change the terminal group 21 of the network connector 2. Each terminal pin 211 is electrically connected. (Each terminal pin 211 can be divided into MX0 +, MX0-, MX1 +, MX1-, MX2 +, MX2-, MX3 + and MD3-, respectively, which are symbols only for distinguishing each pin 211. Actually, it can be changed based on design needs, and does not limit the patent scope of the present invention.)

  As shown in FIG. 4, the autotransformer 4 includes a rectangular frame-shaped core 41 (or a circular shape or a rectangular shape) and two 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 is the second coil winding. After being electrically connected to the second input terminal 4221 (B +) of 422, it is electrically connected to the ground side 43. Further, the second output end 4222 (B−) of the second coil winding 422 is electrically connected to another adjacent circuit channel 31 to form a circuit of the autotransformer 4.

  2 and 4 are a simplified circuit diagram of the present invention and a circuit diagram of the autotransformer. As can be seen from the figure, when the network signal processing circuit of the present invention is actually implemented, the terminal pin 211 on one side of the terminal group 21 of the network connector 2 receives a shock from a lightning strike from the outside in the process of transmitting the network signal. In this case, the instantaneous high voltage and surge generated by lightning strike are transmitted to each circuit channel 31 of the processing circuit 3 through the network connector 2, and are transmitted from each circuit channel 31 to each autotransformer 4. Since each autotransformer 4 has a low electrical resistance value (approximately 0.1Ω to 10Ω), the instantaneous high voltage generated by a lightning strike reaches several thousand KV (volts) and a surge. The high voltage and surge are transmitted to each autotransformer 4 through the circuit channel 31. By winding the first coil winding 421 and the second coil winding 422 of the autotransformer 4 on the core 41 in a series connection method, an instantaneous high voltage is transmitted to the ground side 43 to step down and the high voltage is reduced. Buffer.

Via each autotransformer 4, the network signal in each circuit channel 31 and the instantaneous high voltage are separated, and the instantaneous high voltage is not canceled mutually with the network signal, and the instantaneous high voltage is transferred to the ground side 43. If transmitted, the network signal can be stably transmitted to each circuit channel 31 without being affected by the network signal transmission between the circuit channels 31. That is, the network system is not damaged at the same time as reducing the occurrence of an unstable or interrupting phenomenon in the network signal transmitted by the instantaneous high voltage due to the lightning strike. In addition, we will conduct a test by simulating a lightning strike generator through the network, and explain based on the obtained data.

  Current DC filtering circuits applied to network lines can be used to filter DC and low frequency noise. In addition, the duration of a surge caused by direct current or low frequency noise such as static electricity or lightning strike is extremely short, and the signal is a low frequency signal. The width of a surge generated by static electricity or lightning strike is about several thousand volts (Volt), the frequency is about 1 kHz to 1 MHz, and the voltage rise time (Rise Time) is about 1 to 10 microseconds (μs). However, the transmission speed of a connector that performs high-speed transmission such as a network connector is about 10 Mb / s to 1 Gb / s, and the frequency of the corresponding transmission signal is 2.5 MHz to 125 MHz, both far exceeding 1 MHz. Therefore, a low frequency signal can be filtered by setting one frequency threshold value (for example, 1 MHz) in the DC high-pass filter circuit and allowing only a signal exceeding the threshold value to pass.

  Regarding the instantaneous high voltage shock caused by a lightning strike, when a lightning strike generator that tests based on the norm of IEC 60950-4-5 uses a lightning shock waveform of 10/700, an internal resistance value of about 15Ω is internally provided. And the external electrical resistance of the lightning generator should be equal to 25Ω. When the network uses a 10 / 100M network cable, it is composed of 8 lines, and each line has 8 200Ω electric resistances connected in series (8 200Ω electric resistances are connected in parallel and 25Ω externally). Equivalent resistance). For example, when a lightning striker generator generates an instantaneous high voltage (low frequency direct current) of 6 KV (thousand volts), the autotransformer 4 (having an electrical resistance value of 0.1Ω to 10Ω and the best electrical resistance value installed) Is 1Ω). The formula for the calculation is as follows:

  6KV / (15 + 200 + 1) X1Ω (when the best electrical resistance value of the autotransformer 4 is set to 1Ω) ≈27.778V

  The lightning strike received by the network connector 2 is stepped down and buffered to 27.778V by the low electrical resistance value of the autotransformer 4, and the remaining large voltage value (about 5 to 97KV) is electrically connected to each autotransformer 4. Is eliminated by the grounded side 43. Only 27.778V of the remaining voltage value remains on the network processing circuit 3 after the autotransformer 4 has processed. This voltage value is a voltage value that the network processing circuit 3 can withstand. [The network line can withstand a voltage value of tens to hundreds of volts (V), and the network processing circuit 3 has a coupling capacitor 32 of 0.1 μF. Can withstand a voltage of about 50V]. In other words, the instantaneous high voltage when the network connector 2 is subjected to a lightning strike is such that the two coil windings 42 of the single-winding transformer 4 are connected in series by connecting the first coil winding 421 and the second coil winding 422 in series. Since the high voltage at the moment of lightning strike is stepped down and buffered by being wound on the winding transformer 4, the instantaneous high voltage enters the circuit channels 31 of the network processing circuit 3 through the network connector 2, and each circuit channel 31 Each single-winding transformer 4 transmits the instantaneous high voltage to the ground side 43 by the first coil winding 421 and the second coil winding 422, and the instantaneous high voltage and the network signal in each circuit channel 31. Isolate.

  In addition, each autotransformer 4 does not cancel the network signal with an instantaneous high voltage, and the instantaneous high voltage is not transmitted to each pin 111 of the pin group 11 corresponding to the network chip 1, so that the instantaneous voltage generated by lightning strikes. Can prevent problems such as injury or damage to the processing circuit 3 and the network chip 1 or attenuating the network signal, and each circuit channel 31 can continuously transmit the network signal stably. Does not cause unstable phenomena such as interruption or temporary suspension.

  Further, each autotransformer 4 winds a first coil winding 421 and a second coil winding 422 of two coil windings 42 on a core 41, and a first input end 4211 of the first coil winding 421. (A +) is used to make electrical connection with the adjacent circuit channel 31. The first output end 4212 (A−) of the first coil winding 421 is electrically connected to the ground side 43 after being electrically connected to the second input end 4221 (B +) of the second coil winding 422. Further, the second output end 4222 (B−) of the second coil winding 422 is electrically connected to another adjacent circuit channel 31, thereby forming a circuit of the autotransformer 4. When the circuit channel 31 of the processing circuit 3 is applied to transmission of a network signal (that is, transmission of alternating current), the sensitivity of the autotransformer 4 is 40 μH to 800 μH (microhenry) according to different ranges. (The sensitivity value of the best embodiment can be 80 μH).

If the equivalent impedance value is calculated based on the equivalent impedance value, the value of the autotransformer 4 can be between 200 ohm (Ω) and 10,000 ohm (Ω) when the equivalent impedance value is 100 MHz. The impedance that appears on the line of the frequency band transmitting the network does not affect the transmission of the network signal.
A common network signal, such as 10M, 100M, or 1G, can be transmitted smoothly through the processing circuit, and the network signal is not interrupted, paused, or attenuated. No interference or influence of 4. The reactance value of the autotransformer 4 can be calculated by the following formula.

  Reactance value (ohm) = 2πxFxL

The parameter F is an operating frequency [unit: hertz (Hz)].
The parameter L is an inductance amount [unit: Henry (μH)], π = 3.14159.

  For the network signal (high frequency signal), when the reactance value of the autotransformer 4 is calculated with the operating frequency (F) of 10,000,000 Hz and the inductance (L) of 80 μH, the reactance value of the autotransformer 4 is 2 × 3.14159 × 10,000,000 × 80 = 50,265.44 ohms≈50K ohms.

  The operating frequency (F = 1000 Hz) of the instantaneous high voltage generated when the network receives a lightning stroke (low frequency signal) (when using a 10/700 lightning shock waveform, 10 μs + 700 μs≈1 mμs≈1 KHz = F) In this case, due to the inductance of the autotransformer 4 (L = 80 μH), the reactance value of the autotransformer 4 obtained is equivalent impedance of 2 × 3.14159 × 1,000 × 80 = 5.026544 ohms≈5 ohms [The numerical value of the autotransformer 4 is between 200 ohm (Ω) and 10,000 ohm (Ω)]. The instantaneous high voltage caused by a lightning stroke can be found from the above calculation formula. The reactance, the operating frequency, and the inductance value are directly proportional. Therefore, under the situation where the signal operating frequency increases, the reactance also increases accordingly. However, due to the increase in reactance, the attenuation of the signal increases, and therefore the network is interrupted or the transmission speed of the network becomes slow. Arise.

  However, if the reactance value is effectively lowered by reducing the reactance value to about 5 ohms due to the buffer by the coupling of the autotransformer 4, the signal attenuation state can be effectively reduced. Instability such as interruption or temporary suspension can be prevented by attenuation of network signal transmission. That is, since each circuit channel 31 can avoid a phenomenon such as interruption or temporary suspension of network signal transmission caused by a lightning strike, each circuit channel 31 can still smoothly transmit a network signal, and the influence of the lightning strike. Not receive.

Therefore, the present invention mainly designs the lightning strike prevention device of the network signal processing circuit, and electrically connects the processing circuit between the network chip and the network connector. Each circuit channel of the processing circuit is electrically connected to the signal coupling capacitor and further connected in parallel to the autotransformer. The main point of protection is to filter the instantaneous high voltage that occurs when the network signal is subjected to lightning strikes through the coupling action of the autotransformer. The application of network signals is smoother because the instantaneous high voltage has the advantage of avoiding the impact and damage of the network chip or related electronic components, and avoiding the impact of the network signal due to lightning strikes. Reach the purpose without interruption during data transmission.
The above shows the best embodiment of the present invention, and does not limit the scope of the present invention. Even if simple modifications and equivalent structural changes are made using the manuals and diagrams of the present invention, the important significance of the present invention is not lost and is included in the scope of the present invention.

  When the lightning strike prevention device for a network signal processing circuit according to the present invention is actually implemented according to the above-described contents, the above-described effects and objects can be surely realized and the practicality is excellent.

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 Single-turn transformer 41 Core 42 Coil winding 421 First coil winding 4211 First input terminal 4212 1st output terminal 422 2nd coil winding 4221 2nd input terminal 4222 2nd output terminal 43 Ground side 5 Circuit board

Claims (3)

Including a network chip for transmitting a network chip, a processing circuit and a network signal;
The network chip is electrically connected to the network connector using a processing circuit, and the processing circuit is provided with a plurality of circuit channels between the network chip and the network connector, on one set or more than one set of circuit channels. In addition, each signal coupling capacitor is electrically connected,
The processing circuit is one set or one or more sets of circuit channels interposed between the signal coupling capacitor and the network connector, and the electric capacity of the signal coupling capacitor is 100 μF to 0.01 μF. Reducing the reactance value by connecting each with a single voltage transformer in a parallel manner between matching circuit channels,
In addition, the electric resistance value installed in each autotransformer is 0.1Ω to 10Ω, and each autotransformer includes a core and two coil windings wound on the core. The first input end of one coil winding is electrically connected to the circuit channel adjacent to one side, and the first output end of the first coil winding is electrically connected to the second input end of the second coil winding and then grounded again. And a second output end of the second coil winding is electrically connected to a circuit channel adjacent to the other side, and the structure of a lightning strike prevention device for a network signal processing circuit. Included in the single-winding transformer are a rectangular coil-shaped core 41 and a first coil winding wound around each side of the rectangular frame-shaped core, a second coil winding,
The network chip and the processing circuit are molded on a circuit board by an electrical connection method, and further electrically connected to an external network connector via the circuit board,
Alternatively, the network connector and the processing circuit are molded on a circuit board by an electrical connection method, and further electrically connected to an external network chip via the circuit board.
The first input end of the first coil winding of the two coil windings is electrically connected to a circuit channel adjacent to one side via a circuit layout installed on the circuit board, and the first coil winding of the first coil winding One output end is electrically connected to the second input end of the second coil winding through the circuit layout installed on the circuit board, and further electrically connected to the ground side through the circuit layout installed on the circuit board. ,
2. The network signal processing circuit according to claim 1, wherein the second output end of the second coil winding is electrically connected to a circuit channel adjacent to the other side through a circuit layout installed on the circuit board. Structure of lightning strike prevention device.   The best electrical resistance value installed inside the autotransformer is 1Ω, and the reactance value (ohm) of the autotransformer is 2πxFxL, and the parameter F is an operating frequency (unit: hertz (Hz)). The parameter L is an inductance [unit: Henry (μH)], π = 3.14159, and the best electric capacity of the signal coupling capacitor is 0.1 μF. The structure of the lightning strike prevention apparatus of the network signal processing circuit of 1.

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