Ethernet interface surge preventive circuit

Abstract

The invention provides an Ethernet interface surge preventive circuit. A power protection circuit is used to realize differential mode protection for live wire and zero line parts and common mode protection for live wire grounding and zero line grounding; a POE buckle plate protection circuit is arranged to selected different paths for positive and negative currents to absorb large power current and play a protection role; and the protection circuit is provided primary and secondary protection circuits, the differential mode protection capability of the network port is enhanced, transmission performance of the network is not influenced, original network transmission distance and speed can be ensured, the network transmission distance and network port waveform can meet the standards, and alightning protection effect is good.

Description

Technical field [0001] The invention relates to the field of electric power communication, in particular to an Ethernet interface anti-surge circuit. Background technique [0002] Power communication equipment is generally used to monitor and communicate with the entire power grid. Because it often deals with high voltages, for specific application scenarios, the power specification proposes that the network ports of communication equipment need to meet the requirements of surge and withstand voltage. The method of surge protection is to effectively discharge the energy of lightning strikes, while the method of withstand voltage requires the equipment to prevent the conduction of high voltage from forming current. One is to conduct and the other is to resist. These two kinds of protection are inherently contradictory. . In many power communication equipment development manufacturers, everyone basically implements surges by installing lightning protection devices for network port...

AI Technical Summary

Problems solved by technology

Among many power communication equipment development manufacturers, everyone basically realizes the surge by installing the lightning protection device of the network port, and overvoltage by removing the lightning protection device of the network port. Network port surge and withstand voltage protection requirements, because the new standards ITU-TK.21 and K.44 increase the differential mode protection requirements of POE (Power Over Ethernet active Ethernet) equipment, so the POE equipment we design and produce Must have differential mode protection

However, in the existing technology, there are problems that cannot meet the surge and withstand voltage protection requirements of the power network port at the same time, and the differential mode protection capability of POE equipment is poor.

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