CN111313391A - Ethernet port lightning protection surge protection circuit of industrial Internet of things gateway - Google Patents

Abstract

The invention discloses an Ethernet port lightning protection surge protection circuit of an industrial Internet of things gateway, which is applied to a communication terminal, wherein the communication terminal comprises an RJ45 Ethernet port and a network card chip, and is characterized in that the Ethernet port lightning protection surge protection circuit of the industrial Internet of things gateway comprises a primary protection circuit and a secondary protection circuit which are arranged between the RJ45 Ethernet port and the network card chip, and the circuit is applied to the industrial Internet of things gateway terminal; the surge protection system required by the gateway power supply of the Internet of things generally comprises two stages, reliable protection can be realized by utilizing the characteristics of various surge suppression devices, surge current can be effectively discharged, surge energy is absorbed, and the integral anti-surge grade is improved, so that electronic components such as subsequent chips of the gateway of the Internet of things are effectively protected, the electronic components cannot be damaged by the surge current, the surge test standards such as GB/T17626.5 and IEC61000-4-5 are met, the 4-stage is reached, and the static test standards such as GB/T17626.2 and IEC61000-4-2 are met, and the 4-stage is reached.

Description

An Ethernet port lightning protection and surge protection circuit for an industrial Internet of Things gateway

technical field

The invention relates to the field of Internet of Things communication gateway equipment, in particular to an Ethernet port lightning protection and surge protection circuit of an industrial Internet of Things gateway.

Background technique

The industrial Ethernet interface is the most widely used communication equipment interface. The electromagnetic compatibility of Ethernet is related to the stable operation of the communication equipment. In the industrial application environment, Ethernet is prone to surges and outdoor use of Ethernet is prone to lightning strikes. Overvoltage and overcurrent generated by lightning surges will damage the electromagnetic compatibility balance of Ethernet. Therefore, it is necessary to make a lightning strike protection scheme for industrial Ethernet interfaces. .

1. The equipment is installed in the field or in a strong electromagnetic industrial environment.

2. After the lightning strike of the Ethernet port of the industrial IoT gateway is damaged, the continuity of industrial data collection is affected.

3. After the industrial IoT gateway is damaged by lightning, the maintenance cost is high.

4. The high surge protection of the Ethernet port of the industrial IoT gateway has become one of the functions that the device must have;

In the industrial environment, network communication cannot avoid the high surge caused by strong electromagnetic interference and the damage to the communication network port caused by lightning strikes in the field. In this case, it is necessary to increase the protection circuit and surge absorption of the Ethernet network port.

To this end, a lightning and surge protection circuit for Ethernet ports of an industrial IoT gateway is proposed.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an Ethernet port lightning protection and surge protection circuit of an industrial Internet of Things gateway. By adopting the protection circuit of this scheme, it can meet the surge test standards such as GB/T17626.5 and IEC61000-4-5, and reach 4 Class, and meet GB/T17626.2, IEC61000-4-2 and other electrostatic test standards, reaching class 4. The overall application environment of the Industrial Internet of Things is satisfied, so as to solve the problems raised in the above background art.

In order to achieve the above purpose, the present invention provides the following technical solutions: an Ethernet port lightning protection and surge protection circuit of an industrial Internet of Things gateway, which is applied to a communication terminal, wherein the communication terminal includes an RJ45 Ethernet port and a network card chip, and is characterized in that , the lightning and surge protection circuit of the Ethernet port of the industrial Internet of Things gateway includes a primary protection circuit and a secondary protection circuit arranged between the RJ45 Ethernet port and the network card chip.

By adopting the above technical solutions, the circuit is applied to the terminal of the industrial IoT gateway; the surge protection system required by the power supply of the IoT gateway is generally composed of two levels. By utilizing the characteristics of various surge suppression devices, reliable protection can be achieved and effective It discharges the surge current, absorbs the surge energy, and improves the overall anti-surge level, thereby effectively protecting the electronic components such as the subsequent chips of the IoT gateway, so that it will not be damaged by the surge current, which meets GB/T17626. 5. IEC61000-4-5 and other surge test standards, reaching level 4, and meeting GB/T17626.2, IEC61000-4-2 and other electrostatic test standards, reaching level 4. The overall satisfaction of the industrial Internet of Things application environment.

Preferably, the primary protection circuit includes a ceramic gas discharge tube GDT, one end of the ceramic gas discharge tube GDT is electrically connected to the RJ45 Ethernet port, and the other end of the ceramic gas discharge tube is grounded.

Preferably, the model of the ceramic gas discharge tube is UN1812-90CSMD, the capacitance value is less than 1.0pF, and the resistance value is more than 1GΩ.

Preferably, the secondary protection circuit adopts a TVS tube to absorb differential mode energy as the secondary protection, and the TVS tube in the secondary circuit protection adopts a transient suppression diode.

Preferably, the TVS tube model is SLVU2.8-4.

Compared with the prior art, the beneficial effects of the present invention are:

This circuit is used in industrial IoT gateway terminals; the surge protection system required by the IoT gateway power supply is generally composed of two levels. Using the characteristics of various surge suppression devices, reliable protection can be achieved, and surge current can be effectively discharged. Absorb surge energy and improve the overall anti-surge level, thus effectively protecting electronic components such as subsequent chips of the IoT gateway, so that they will not be damaged by surge current, meeting GB/T17626.5, IEC61000-4- 5 surge test standards, reaching level 4, and meet GB/T17626.2, IEC61000-4-2 and other electrostatic test standards, reaching level 4. The overall satisfaction of the industrial Internet of Things application environment.

Description of drawings

1 is a structural block diagram of an embodiment of the present invention;

Fig. 2 is the circuit diagram of the RJ45 Ethernet port of the present invention;

3 is an overall circuit diagram of a ceramic gas discharge tube used in the primary protection of the present invention;

4 is a circuit diagram of a TVS diode of the present invention.

In the picture:

1. RJ45 Ethernet port; 2. Primary protection circuit; 3. Secondary protection circuit; 4. Network card chip.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to FIG. 1 to FIG. 4, the present invention provides a technical solution:

As shown in Figure 1, an Ethernet port lightning protection and surge protection circuit of an industrial IoT gateway is applied to a communication terminal. The communication terminal includes an RJ45 Ethernet port 1 and a network card chip 4. The lightning and surge protection circuit of the Ethernet port includes a primary protection circuit 2 and a secondary protection circuit 3 arranged between the RJ45 Ethernet port 1 and the network card chip 4 .

By adopting the above technical solutions, the circuit is applied to the terminal of the industrial IoT gateway; the surge protection system required by the power supply of the IoT gateway is generally composed of two levels. By utilizing the characteristics of various surge suppression devices, reliable protection can be achieved and effective It discharges the surge current, absorbs the surge energy, and improves the overall anti-surge level, thereby effectively protecting the electronic components such as the subsequent chips of the IoT gateway, so that it will not be damaged by the surge current, which meets GB/T17626. 5. IEC61000-4-5 and other surge test standards, reaching level 4, and meeting GB/T17626.2, IEC61000-4-2 and other electrostatic test standards, reaching level 4. The overall satisfaction of the industrial Internet of Things application environment.

Specifically, as shown in FIG. 3 , the primary protection circuit 2 includes a ceramic gas discharge tube GDT, one end of the ceramic gas discharge tube GDT is electrically connected to the RJ45 Ethernet port 1 , and the other end of the ceramic gas discharge tube is grounded.

Specifically, as shown in FIG. 3 , the model of the ceramic gas discharge tube is UN1812-90CSMD, the capacitance value is less than 1.0pF, and the resistance value is more than 1GΩ.

Specifically, as shown in FIG. 4 , the secondary protection circuit 3 uses a TVS tube to absorb differential mode energy as the secondary protection, and the TVS tube uses a transient suppression diode in the secondary circuit protection.

Specifically, as shown in FIG. 4 , the TVS tube model is SLVU2.8-4.

working principle:

This circuit is used in industrial IoT gateway terminals. The surge protection system required by the IoT gateway power supply is generally composed of two levels. Using the characteristics of various surge suppression devices, reliable protection can be achieved, and the surge current can be effectively discharged. Absorb surge energy and improve the overall anti-surge level, thus effectively protecting electronic components such as subsequent chips of the IoT gateway, so that they will not be damaged by surge current, meeting GB/T17626.5, IEC61000-4- 5 surge test standards, reaching level 4, and meet GB/T17626.2, IEC61000-4-2 and other electrostatic test standards, reaching level 4. The overall satisfaction of the industrial Internet of Things application environment.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (5)

1. The utility model provides an industry thing networking gateway's ethernet port lightning protection surge protection circuit, is applied to communication terminal, communication terminal includes RJ45 ethernet port (1) and network card chip (4), its characterized in that, industry thing networking gateway's ethernet port lightning protection surge protection circuit is including setting up RJ45 ethernet port (1) with one-level protection circuit (2) and second grade protection circuit (3) between network card chip (4).

2. The Ethernet port (1) of the gateway of the Internet of things of industry of claim 1 is protected from lightning surges, characterized in that: one-level protection circuit (2) include ceramic gas discharge tube GDT, and ceramic gas discharge tube GDT's one end and RJ45 ethernet port (1) electricity are connected, and ceramic gas discharge tube's the other end ground connection.

3. The Ethernet port (1) of the gateway of the Internet of things of industry of claim 2 is provided with a lightning surge protection circuit, which is characterized in that: the ceramic gas discharge tube is UN1812-90CSMD, the capacitance value is less than 1.0pF, and the resistance is more than 1G omega.

4. The Ethernet port (1) of the gateway of the Internet of things of industry of claim 1 is protected from lightning surges, characterized in that: the secondary protection circuit (3) adopts a TVS tube to absorb differential mode energy as secondary protection, and the TVS tube adopts a transient suppression diode in the secondary circuit protection.

5. The Ethernet port (1) of the gateway of the Internet of things of industry of claim 5 is provided with a lightning surge protection circuit, which is characterized in that: the model of the TVS tube is SLVU 2.8-4.

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