CN205304748U - Lightning protection and noise filtering circuit for electronic signals - Google Patents

Abstract

The utility model discloses an electronic signal's lightning protection and noise filtering circuit, this circuit utilizes electronic signal processing circuit first electronic device of electric connection and second electronic device respectively, and processing circuit is equipped with a plurality of circuit channels between two electronic device, and on a set of or circuit channel more than a set of respectively the electrical property even be equipped with electric capacity and auto transformer, and it has two sets of coil windings to coil respectively on a plurality of auto transformer, one of them group coil winding includes first coil winding and second coil winding in order to constitute common mode inductance unit, another group coil winding includes that third coil winding and fourth coil winding constitute is auto transformer, thereby can reduce the interference such as electromagnetic wave or noise that electronic signal received, and the high voltage etc. in the twinkling of an eye that produces during the filtering thunderbolt, reach the purpose of stably transmitting electronic signal.

Description

Lightning protection and noise filtering circuit for electronic signal

technical field

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

Background technique

Nowadays, with the rapid development of computer technology, many electronic and electrical products make people's daily life and work more convenient and comfortable. Electronic devices commonly used in people's daily life or work, such as desktop computers, notebook computers, tablet computers or smart phones, are all It has been ubiquitous in every corner of life, and the development trend of electronic devices is also moving towards the direction of powerful computing functions, fast speed and small size. Due to the rapid development of network communication technology, it will integrate 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 emails to each other through network communication, and at the same time search for various information through the network, real-time communication or online Games, etc., make the relationship between people and the Internet more intense and inseparable.

Various electronic devices or networks generally use two methods of cable connection and wireless transmission to transmit data. The cable connection technology needs to be equipped with electrical connectors. With the increasing use of electronic devices and networks, the electronic signals transmitted by electronic devices And the data capacity transmitted on the network is also increasing. In order to meet the needs of users, network manufacturers have been increasing the speed of network transmission, from 10Mbps to 100Mbps or 1Gbps, and even the transmission speed of the optical fiber network introduced now can reach more than 10Gbps. However, , whether it is an electronic signal or a network signal, when it is affected by a lightning strike, it will cause the electrical connector connected to the electronic signal or network signal line to receive the high-voltage signal generated at the moment of the lightning strike, and the instantaneous high voltage will cause the processing circuit to be electrically connected Damage to the chips and electronic parts of the electronic device, in addition to causing unstable, interrupted or completely inaccessible transmission of electronic signals or network signals, and even causing circuit boards or electronic devices ( Such as computers or sharers, etc.) hosts are faulted or damaged by the impact of 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 transmission operations such as network signal connection, uploading, and downloading, it is easy to be interfered by noise such as signals and electromagnetic waves from surrounding electronic components, or when various electronic devices transmit electronic signals, they are also susceptible to signals and electromagnetic waves from surrounding electronic components. The interference of noise and other noise will lead to the instability of electronic signal and network signal transmission, so filter elements, lightning protection devices and signal coupling devices must be installed in electronic devices or electrical connectors to filter signals and prevent Instantaneous high voltage during lightning strikes, etc., to reduce interference from noise, electromagnetic waves or instantaneous high voltages, surges, etc. of lightning strikes.

Therefore, how to solve the problem of electronic devices being struck by lightning to generate instantaneous high voltage, resulting in damage to chips, electronic parts or circuits, or the lack and insufficiency of electronic signal transmission being interfered by external electromagnetic waves, noise, etc., resulting in poor quality of electronic signal transmission, transmission The troubles and troubles such as content interruption or suspension are the directions that those engaged in this industry are eager 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 the inclusion of electronic signal transmission. Electromagnetic wave (EMI), noise interference or instantaneous high voltage of lightning strike, etc., and lightning protection and noise filtering circuit that can stably transmit electronic signals.

The main purpose of this utility model is that the lightning protection and noise filtering circuit utilizes an electronic signal processing circuit to electrically connect the first electronic device and the second electronic device respectively, and the processing circuit is between the first electronic device and the second electronic device There are multiple circuit channels, and one or more sets of circuit channels are electrically connected with capacitors and autotransformers, and multiple autotransformers are respectively wound with two sets of coil windings on the iron core. One set of coil windings includes the first coil winding and the second coil winding to form a common mode inductance unit, and the other set of coil windings includes the third coil winding and the fourth coil winding to become an autotransformer, thereby reducing the impact of the electronic signal Electromagnetic wave or noise and other interference, and filter out the instantaneous high voltage, surge, etc. generated during lightning strikes, so as to achieve the purpose of stably transmitting electronic 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) The other set of coil windings on the autotransformer includes the third coil winding and the fourth coil winding, and the third input end of the third coil winding of each variac is electrically connected to the circuit channel on the adjacent side, The third output end of each third coil winding is electrically connected to the fourth input end of each fourth coil winding, and then the fourth output end of each fourth coil winding is respectively electrically connected to the adjacent circuit on the other side channel, the induction value of each variac is between 30 μH to 350 μH, and the DC resistance is 0.5 ohm to 2 ohms (Ω, ohms), and the induction value of the preferred embodiment is 80 μH, and the DC resistance (DCR) is 1 ohm (Ω, ohms), and the inductance value of each coupling transformer (ohm) = 2π×F×L, the parameter F is the working 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 can wind the first two sets of coil windings on each side of the rectangular frame-shaped iron core. Coil winding, second coil winding, third coil winding and fourth coil winding.

Another object of the present utility model is the first electronic device for lightning protection and noise filtering (it can be a chip or a processor on a circuit board such as a desktop computer mainframe, a notebook computer mainframe, a tablet computer mainframe or a smart phone mainframe, etc.) And the processing circuit can be formed on the preset circuit board in the form of electrical connection, and then electrically connected to the second external electronic device through the circuit board (it can be a desktop computer host, a notebook computer host, a tablet computer host or a smart phone host, etc. electrical connectors (such as USB electrical connectors or network connectors, etc.) or portable storage devices (such as flash drives or removable hard disks, etc.)]; or formed on the circuit in such a way that the first electronic device and the processing circuit are electrically connected board, and then electrically connected to the first external electronic device through the circuit board; the first wire winding and the second coil winding of a group of coil windings on the autotransformer can be electrically connected through the circuit layout on the preset circuit board Between any two adjacent circuit channels; and the third coil winding of another set of coil windings of the autotransformer is electrically connected to the adjacent one side through the circuit layout on the preset circuit board with the third input terminal. The circuit channel, 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 predetermined circuit layout of the circuit board, and then electrically connected to the fourth input end of the fourth coil winding through the predetermined circuit layout of the predetermined circuit board. The ground side, and the fourth output terminal of the fourth coil winding is electrically connected to the adjacent circuit channel on the other side through the circuit layout of the preset circuit board.

Another object of the present invention is that two sets of coil windings are respectively wound on the iron cores of the plurality of autotransformers, wherein one set of coil windings includes a first coil winding and a second coil winding to form a common mode inductance unit, The other set 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-first electronic device; 11-pin group; 111-pin; 2-second electronic device; 21-terminal group; 211-terminal pin; 3-processing circuit; 31-circuit channel; 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-second coil winding ; 4221-second input terminal; 4222-second output terminal; 43-coil winding; 431-third coil winding; 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 electronic signals provided by the utility model includes a first electronic device 1, a second electronic device 2 and a processing circuit 3, wherein:

The first electronic device 1 has a pin group 11 for transmitting electronic/voltage signals, and the second electronic device 2 has a terminal group 21 for transmitting electronic/voltage signals, and then electrically connected between the pin group 11 and the terminal group 21 The processing circuit 3 is connected, and the processing circuit 3 includes one or more sets of circuit channels 31, then one or more sets of circuit channels 31 are electrically connected to the autotransformer 4 in parallel, and each variac 4 is connected to the iron Two sets of coil windings 42, 43 are wound on the core 41, wherein one set of coil windings 42 includes a first coil winding 421 and a second coil winding 422, the first coil winding 421 is connected to a first input terminal (A+) 4211, a first output The terminal (A-) 4212 is electrically connected to the adjacent circuit channel 31 in series, and the second coil winding 422 is electrically connected in series with the second input terminal (B+) 4221 and the second output terminal (B-) 4222. Connected to another adjacent circuit channel 31, so that the first coil winding 421 and the second coil winding 422 are respectively electrically connected to any two adjacent circuit channels 31 to form a common mode inductance unit 420; the other coil The winding 43 includes a third coil winding 431 and a fourth coil winding 432, the third input end 4311 (A+) of the third coil winding 431 of the coil winding 43 is electrically connected to the adjacent circuit channel 31, the third coil winding 431 The third output end 4312 (A-) of the fourth coil winding 432 is electrically connected to the fourth input end 4321 (B+) of the fourth coil winding 432 and then electrically connected to the ground side 44, and the fourth output end 4322 of the fourth coil winding 432 (B-) Electrically connected to another adjacent circuit channel 31 to form a loop of the autotransformer 4; the autotransformer 4 simultaneously winds two sets of coil windings 42 on the iron core 41, and one set of coil windings 42 Constitute the common-mode inductance unit 420, and another group of coil windings 43 constitute the loop of the autotransformer 4, to achieve the purpose of the common-mode inductance unit 420 and the autotransformer 4 sharing the same iron core 41, to reduce the cost of manufacturing the common-mode inductance unit 420 and The cost of the autotransformer 4 is low, and it is convenient to assemble the autotransformer 4 on one or more groups of circuit channels 31 of the processing circuit 3, thereby shortening the processing time, saving time and labor, and more in line with economic benefits.

And the above-mentioned first electronic device 1 (which can be a chip or a processor on a circuit board such as a desktop computer host, a notebook computer host, a tablet computer host, or a smart phone host) and the processing circuit 3 can be formed on the circuit board in an electrically connected manner. 5, and then electrically connected with the external second electronic device 2 through the circuit board 5, the second electronic device 2 can be an electrical connector (such as a USB electrical connector or network connector, etc.) or a portable storage device (such as a flash drive or a removable hard disk, etc.); the second electronic device 2 and the processing circuit 3 can also be formed on the circuit board 5 in an electrically connected manner, and then The circuit board 5 is electrically connected to the external first electronic device 1; and the circuit board 5 provides the power required by the circuits such as the first electronic device 1, the second electronic device 2 and the processing circuit 3, and the circuit board 5 can be set There is a power supply (such as: dry battery, rechargeable battery, lithium battery or button battery, etc., or a power supply electrically connected to an external mains power supply through a power cord to supply the power required by the circuit board 5), and the first electronic device 1. The second electronic device 2 and its configuration are prior art, and the detailed structure is not the main point of the present invention, 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 first electronic device 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, which is not to limit the scope of protection of the present utility model); and the processing circuit 3 utilizes each circuit channel The other end of 31 is electrically connected to each terminal pin 211 of the terminal group 21 of the second electronic device 2 (each terminal pin 211 can be respectively MX0+, MX0-, MX1+, MX1-, MX2+, MX2-, MX3+ and MD3-, It is only used as a number for distinguishing each terminal pin 211, and each number can be changed according to actual design requirements, not to limit the scope of protection of the present utility model).

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 and the second coil winding 422 respectively The preset circuit layout on the circuit board 5 is electrically connected to any two adjacent circuit channels 31 to form a common mode inductance unit 420. The inductance value of the common mode inductance unit 420 is between 90 ohms (Ω, ohms)～ Between 1000 ohms (Ω, ohms), and when transmitting network signals on each circuit channel 31 of the network signal processing circuit 3, the noise conditions contained in various signals are different, then the preferred embodiment of the common mode inductance unit 420 The inductance value 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 interference such as electromagnetic waves (EMI) or noise (niose), then 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 stability of high-frequency network signal transmission property], 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, thereby effectively filtering out interference such as electromagnetic waves or noise; and the first coil winding of the two coil windings 42 The first input end 4211 (A+) of 421 is electrically connected to the adjacent circuit channel 31, and the first output end 4212 (A-) of the first coil winding 421 is electrically connected to the After the second input terminal 4221 (B+) of the second coil winding 422 is electrically connected to the ground side 43 through the preset circuit layout of the circuit board 5, and the second output terminal 4222 (B−) of the second coil winding 422 ) 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 preset circuit layout of the circuit board 5 to form A loop of the autotransformer 4 is formed.

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 electronic signal cancel each other out, so that after the instantaneous high voltage is transmitted to the ground side 44, the network signal transmission between the circuit channels 31 will not be affected, and the electronic signal can be stably transmitted by each circuit channel 31, that is, Reduce the instability or interruption of the transmitted electronic signal caused by the instantaneous high voltage of the lightning strike, and will not damage the network system, and then detect it through the network simulation lightning strike generator of the electronic device to explain the obtained data, among which:

The DC filter circuit currently used in the network lines of electronic devices can be used to filter out DC and low-frequency noise, and the DC and low-frequency noise, such as the surge generated by static electricity or lightning strikes, has a very short duration and is low-frequency 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 electrical connectors and other high-speed transmission electrical connectors, the transmission speed is mostly in the range of 10Mb/s to 1Gb/s, and the frequency of the corresponding transmission signal is between 2.5MHz to 125MHz, which is far more than 1MHz. Therefore, DC Qualcomm The filter circuit can set a frequency threshold value, such as 1MHz, and only let the signal whose frequency exceeds the threshold value pass through, so as to filter out the low frequency signal. For the impact of instantaneous high voltage generated by lightning strike, according to the specification of IEC60950-4-5 The lightning strike generator for detection, when using the 10/700 lightning shock waveform, its internal internal resistance is about 15Ω, and the external resistance of the lightning strike generator must be equivalent to 25Ω, if using a network cable such as 10/100M , which consists 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 (kilovolts) The instantaneous 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 second electronic device 2 is stepped down and buffered to 27.778V by the low resistance value of the autotransformer 4, and the rest of the large voltage (about 5.97KV) is electrically connected to the ground side 44 through the respective variac 4 Filtering out, only residual voltage value 27.778V is left on the processing circuit 3 after the autotransformer 4 processing, and this voltage value is the voltage value that the processing circuit 3 can withstand [the network line can withstand the voltage of about tens to hundreds of volts (V) value, the processing circuit 3 can use a coupling capacitor of 0.1 μF, which can withstand a voltage of about 50V], that is, the instantaneous high voltage of the second electronic device 2 when it is subjected to a lightning strike can pass through a group of coil windings 43 of the autotransformer 4 to the first The three-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 processing circuit from the second electronic device 2 In each circuit channel 31 of 3, that is, the instantaneous high voltage is transmitted to the ground side 44 with the third coil winding 431 and the fourth coil winding 432 through each coupling transformer 4 between each circuit channel 31, thereby connecting the instantaneous high voltage to each The electronic signal or network signal in the circuit channel 31 is separated, and each coupling transformer 4 will not allow the electronic signal or network signal to be offset by the instantaneous high voltage, that is, the instantaneous high voltage will not be transmitted to the corresponding tube of the first electronic device 1. Each pin 111 of the pin group 11 prevents the instantaneous high voltage generated by the lightning strike from causing damage to the processing circuit 3 and the first electronic device 1, etc., or from attenuating electronic signals or network signals, so that each circuit channel 31 can continue The stable transmission of network signals will not cause unstable phenomena such as interruption or suspension of electronic signals, so that the transmission of electronic signals will be smooth and the quality of electronic signal transmission will be improved.

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 (A+) 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 During the transmission of network signals (that is, the transmission of alternating current), the inductance of the autotransformer 4 can be between 40 μH and 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), and the On the frequency band line, 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, etc., thus It will not be interfered or affected 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)], and π=3.14159.

If the network signal (high-frequency signal) is taken 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 inductance of the autotransformer 4 The value is: 2x3.14159x10,000,000x80＝50,265.44 ohms (ohms)≒50K ohms (ohms).

When the instantaneous high voltage (10μs+700μs≒1mμs≒1KHz＝F) generated by the lightning strike (low frequency signal) of the electronic device 1, 2 or the network (when using the 10/700 lightning strike waveform), when the working frequency (F=1000Hz), Through the inductance of the autotransformer 4 (L=80μH), the inductance value of the autotransformer 4 can be obtained: 2x3.14159x1,000x80=5.026544 ohms (ohms)≒5 ohms (ohms) equivalent impedance [auto The value of the coupling transformer 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, and the inductive reactance is proportional to the working frequency and the inductance value Proportional, so when the signal operating frequency increases, its inductive reactance will also increase, but the increase in inductive reactance will increase the attenuation of the signal, so there will be electronic signals or network disconnection or network transmission speed Slow down, but after the coupling buffer of the autotransformer 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 electronic signals or Unstable phenomena such as interruption or suspension of network signal transmission attenuation can avoid the interruption or suspension of electronic or network signal transmission caused by lightning strikes in each circuit channel 31, so that each circuit channel 31 can still transmit electronic signals or network signals smoothly , not affected by lightning strikes.

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 Carry out circuit signal processing modes of different frequencies respectively, the common-mode inductance unit 420 of a group of coil windings 42 is used to filter out external electromagnetic waves or noises received by high-frequency network signals, and the other group of coil windings 43 is used for autotransformers 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 coils are simultaneously wound on the iron core 41 of the autotransformer 4 Windings 42, 43 will not form mutual interference, conflict and other phenomena; then autotransformer 4 can filter out high-frequency network signal electromagnetic waves, noise and other interference and low-frequency lightning strike signal instantaneous high voltage and surge respectively, then it can reach The network 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, so that after the first electronic device 1 receives an external electronic signal, it passes through the autotransformer of the processing circuit 3 4 and the signal coupling capacitor for lightning protection and noise filtering of electronic signals, so as to transmit stable electronic signals to the first electronic device 1, to ensure that the electronic signal transmission is not easy to be interrupted or suspended, making the application of electronic signals more convenient Smooth, and can improve the quality of electronic signal transmission.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. The lightning protection and noise filtering circuits for electronic signals provided by the present utility model are used in the first electronic device 1 and the second electronic device 1. The electronic devices 2 are electrically connected by the processing circuit 3, so that a group of circuit channels 31 or a group of adjacent circuit channels 31 are respectively electrically connected with an autotransformer 4, and the autotransformer 4 is based on iron Two sets of coil windings 42, 43 are wound on the core 41, so that a set of coil windings 42 constitutes a common mode inductance unit 420, which can absorb electromagnetic waves (EMI) or noise (noise) contained in network signals received by the network connector. It is filtered through the ground side 44 of each variac 4, and then another set of coil windings 43 is used to form an autotransformer 4 loop, which can filter out interference such as instantaneous high voltage and surge waves during lightning strikes, so that each of the processing circuits 3 The circuit channel 31 is not disturbed by lightning and noise, so that it can stably transmit electronic signals, reduce interference such as external electromagnetic waves or noise, and reduce the number of the first electronic device 1, the second electronic device 2, the circuit channel 31 and related electronic components. etc. are affected by the instantaneous high voltage, surge or electromagnetic wave, noise, etc. of the lightning strike, so as to prevent the signal 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 41 with the autotransformer 4 Modes can reduce manufacturing costs, 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. To Chen Ming.

The utility model is mainly designed for the lightning protection device of the electronic signal processing circuit. The processing circuit is electrically connected between the first electronic device, the second electronic device and the circuit channel, and each circuit channel of the processing circuit is electrically connected to each other. Connect the signal coupling capacitor, and then electrically connect 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 autotransformer circuit, which can filter out the instantaneous high voltage generated by the network signal receiving lightning strike and the external electromagnetic wave noise of the network signal, etc., and can prevent the instantaneous high voltage from causing damage to the first electronic device, the second electronic device, the circuit channel or related electronic components, etc. Shock, damage, and avoid interference by electromagnetic wave noise, so that electronic signals can avoid being affected by lightning strikes and noise, etc., it can make the transmission and application of electronic signals smoother, data transmission is not interrupted or suspended, and the common mode inductance unit and self Coupling transformers share the same iron core, which can reduce manufacturing costs.

Claims (8)

1. an anti-lightning strike and noise filtering circuit for electronic signal, it includes the first electronic installation, processes circuit and second electronic device, it is characterised in that:

This first electronic installation includes the pin group with multiple pin;

This process circuit is electrically connected at the pin group of the first electronic installation and is provided with a group or more circuit channel of each pin being electrically connected in pin group, it has been electrically connected with autotransformer on the circuit channel that any two is adjacent, and multiple autotransformer is wound with two groups of coil windings respectively, one of which coil windings on each autotransformer includes first coil winding and the second coil windings, for first coil winding, second coil windings is electrically connected with between the circuit channel that any two is adjacent and forms the common mode inductance unit that inductance value is between 90 ohm��1000 ohm, another group coil windings on each autotransformer includes tertiary coil winding and the 4th coil windings, and the circuit channel of adjacent side it is electrically connected at the 3rd input of the tertiary coil winding of each autotransformer, 3rd outfan of each tertiary coil winding is electrically connected with in the four-input terminal of each 4th coil windings, it is electrically connected with in adjacent opposite side circuit channel with the 4th outfan of each 4th coil windings again, the influence value of each autotransformer is between 30 �� H��350 �� H, and direct current resistance is 0.5 ohm��2 ohm,And

This second electronic device is electrically connected at process circuit, and is provided with and is electrically connected with in each circuit channel and the terminal group with multiple terminal supportor.

2. the anti-lightning strike and noise filtering circuit of electronic signal according to claim 1, it is characterized in that, chip, electric connector or network chip, network connector in this first electronic installation, second electronic device respectively electronic installation or be arranged at the electric connector in electronic installation, Portable memory devices.

3. the anti-lightning strike and noise filtering circuit of electronic signal according to claim 1, it is characterized in that, the first coil winding of one group of coil windings in the plurality of autotransformer is that tandem is electrically connected at adjacent side circuit channel with first input end, the first outfan, and the second coil windings is that tandem is electrically connected at adjacent opposite side circuit channel with the second input, the second outfan.

4. the anti-lightning strike and noise filtering circuit of electronic signal according to claim 1, it is characterised in that the inductance value of the common mode inductance unit that the first coil winding of the plurality of autotransformer, the second coil windings are constituted is 800 ohm.

5. the anti-lightning strike and noise filtering circuit of electronic signal according to claim 1, it is characterized in that, the tertiary coil winding of the plurality of autotransformer, the 4th coil windings influence value be 80 �� H, and direct current resistance is 1 ohm, and the induction reactance value of each autotransformer be 2 �� xFxL, this parameter F is operating frequency; This parameter L is inductance value; ��=3.14159.

6. the anti-lightning strike and noise filtering circuit of electronic signal according to claim 1, it is characterized in that, the plurality of autotransformer includes rectangular box-like iron core and is wound in the first coil winding of each two groups of coil windings of side of rectangular box-like iron core, the second coil windings, tertiary coil winding and the 4th coil windings.

7. the anti-lightning strike and noise filtering circuit of electronic signal according to claim 2, it is characterised in that this network chip and process circuit electrically connected mode take shape on preinstalled circuit plate, again through the network connector outside circuit board electric connection; Or take shape on circuit board with network connector and process circuit electrically connected mode, the network chip of outside it is electrically connected at again through circuit board.

8. the anti-lightning strike and noise filtering circuit of electronic signal according to claim 1, it is characterized in that, the first coil winding of the one group of coil windings in two groups of coil windings in the plurality of autotransformer is be electrically connected at adjacent side circuit channel by the circuit layout on preinstalled circuit plate, and the second coil windings is electrically connected at adjacent opposite side circuit channel also through the circuit layout on preinstalled circuit plate; 3rd input of the tertiary coil winding in another group coil windings is electrically connected at, by the circuit layout on preinstalled circuit plate, the circuit channel that side is adjacent, the 3rd outfan in tertiary coil winding is electrically connected to ground side again through the preinstalled circuit layout of preinstalled circuit plate be electrically connected at the four-input terminal of the 4th coil windings also through the circuit layout of preinstalled circuit plate after, and the 4th outfan of the 4th coil windings is electrically connected to, by the circuit layout of preinstalled circuit plate, the circuit channel that opposite side is adjacent.