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Circuit for inhibiting interference signal and carrying out surge protection

A technology for surge protection and interference suppression, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc.

Active Publication Date: 2012-03-21
黄兴英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the transmission power needs to be large or the attenuation requirements are high, the capacitors connected in series cannot meet these requirements.
Another known method of avoiding destructive low-mid-frequency phenomena on high-frequency signal lines is to use inductive elements in parallel on equipment lines. It also does not reduce the steepness of the voltage rise at the terminals of the electrical equipment

Method used

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  • Circuit for inhibiting interference signal and carrying out surge protection
  • Circuit for inhibiting interference signal and carrying out surge protection
  • Circuit for inhibiting interference signal and carrying out surge protection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] attached figure 1 Shown is a schematic diagram of the circuit structure of the Ethernet interference suppression and lightning protection circuit of the present invention. It can be seen from the figure that on the two pairs of differential lines RX+ and RX- and TX+ and TX- of Ethernet, four impedance elements L1, L2, L3 and L4 are connected in series respectively, among which: the first differential line RX+ is connected in series The impedance element L1 consists of two series reactor coils L11 and L12. The connection method of the reactor coils L11 and L12 is an anti-parallel connection, and the connection terminal A of the two reactor coils in series is also called the anti-parallel connection terminal A, and the lead wire is connected to the ground PGND. In the same way, impedance elements L2~L4 are connected in series on the differential lines RX-, TX+, and TX- in the same way, and each impedance element also includes coils L21 and L22, L31 and L32, L41 and ...

Embodiment 2

[0035] figure 2 shown in the figure 1 On the basis of , the schematic diagram of the circuit structure of each reactor coil is grounded through the voltage sensitive element. This circuit is mainly used in some special environments. Due to the high grounding resistance of the ground grid, there is a lot of interference and the voltage difference of the ground grid potential is large, so as to avoid unnecessary interference that may cause abnormal line transmission. In the figure, the anti-parallel connection terminals A, B, C, and D of the impedance elements L1, L2, L3, and L4 are connected to the ground wire through the voltage sensitive element E.

[0036] When the line voltage is lower than the working voltage of the voltage sensitive element E, the voltage sensitive element E is in an open circuit state, and each differential line is open with the impedance elements L1, L2, L3, L4 and the ground wire; when there is a surge current or voltage wave, When the voltage sens...

Embodiment 3

[0040] image 3 shown in the figure 1 On the basis of , a schematic diagram of the circuit structure of a three-terminal voltage sensitive element connected between the differential line and the series impedance element and grounded. From the figure, it can be seen that the figure 1 On the basis of , the discharge tubes F1, F2 are connected in parallel between the differential line and the series impedance and grounded to ensure that the reactor coils in the impedance elements L1, L2, L3, and L4 will not be burned by excessive surge current. Among them, the discharge tubes F1 and F2 are the same and are three-terminal gas discharge tubes.

[0041] In the mine zone LPZ0 A Zone (Every object in this zone may be directly struck by lightning and conduct all the lightning current, and the electromagnetic field strength in this zone is not attenuated.) and lightning protection zone LPZ0 B (The objects in this area cannot be directly struck by the lightning current correspondin...

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Abstract

The invention discloses a circuit for inhibiting an interference signal and carrying out surge protection. The circuit comprises an Ethernet signal input port and the circuit is characterized in that: each difference line of the Ethernet signal input port is respectively and serially connected with impedance elements composed of two reactor coils which are connected in series or two reactor coils which are reversely connected in parallel; and the impedance elements on each difference line share a magnetic core reactor. The same ends of the two coils are connected with each other in series through the Ethernet difference line and the other two ends are shorted and then are grounded or are serially connected through utilizing a voltage-sensitive element and then are grounded. The inductance impedance parameters of the two reactor coils in the same impedance element of the circuit are the same; forward and reverse inductances which are cancelled out with each other are generated on the serially-connected difference lines by the reactor coils through the way of reversely connecting the reactor coils in parallel; and the inductance impedances of the two ends which are connected with the difference lines are zero. With the circuit provided by the invention, the influence and attenuation on line transmission signals are very small, so that the communication device can be used for effectively inhibiting the interference signal and carrying out the surge protection. The circuit provided by the invention is applicable to various communication circuits.

Description

technical field [0001] The invention relates to a communication circuit, in particular to an interference signal suppression and surge protection circuit. Background technique [0002] At present, in the transmission of high-frequency signal circuits and network signals, such as the transmitting circuit of mobile base stations, the network lines of super-category five lines, coaxial cables, various signal lines, etc. that are widely used now. The input and output terminals of the signal are very susceptible to adverse voltage or current waves such as bad signals and induced lightning surges. These wave phenomena will interfere or even directly damage the insulation performance of the corresponding electronic equipment and lines. Lightning protection is generally not considered in the signal transmission ports of data acquisition, video transmission, Ethernet and other equipment widely used in various communication devices. When these signal transmission ports are not protect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02H9/04H04L12/24
Inventor 黄兴英
Owner 黄兴英
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