Lightning stroke protection circuit of PSE equipment, control method and equipment

Abstract

The invention provides a lightning stroke protection circuit of PSE equipment, a control method and equipment, the input end of the lightning stroke protection circuit is connected with the power supply end of power supply equipment, and the output end of the lightning stroke protection circuit is connected with the interface of internet access equipment; the lightning stroke protection circuit comprises a first lightning stroke protection module, a second lightning stroke protection module and a third lightning stroke protection module; the power supply end of the power supply equipment is connected with the input end of the first lightning stroke protection module and the input end of the second lightning stroke protection module; an interface of the internet access equipment is connected with the output end of the first lightning stroke protection module and the output end of the second lightning stroke protection module. The grounding end of the power supply equipment is connectedwith the grounding end of the first lightning stroke protection module and the input end of the third lightning stroke protection module, the output end of the third lightning stroke protection moduleis connected with the interface of the internet access equipment, and the grounding end of the third lightning stroke protection module is grounded. The response speed is high, the protection effectis good, the leakage current can be cut off, and the error probability of equipment identification is reduced.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a lightning strike protection circuit of a PSE device. Background technique [0002] Active Ethernet (Power Over Ethernet (POE)) refers to the transmission of data signals for some IP-based terminals without any changes to the existing Ethernet Cat.5 cabling infrastructure. Technology that provides DC power to such devices. In the POE system, the power supply is called "power supply equipment" (PSE, Power Sourcing Equipment). [0003] According to the clear regulations on PSE communication equipment in international standards such as CE, FCC, and ITU-TK, PSE equipment should have the ability to protect against common / differential mode lightning strikes, and a lightning strike protection circuit is required. When in use, the PSE device needs to follow the IEEE802.3af / at / bt protocol standard, and perform handshake pairing according to the protocol standard. The protocol handshake is main...

AI Technical Summary

Problems solved by technology

[0004] At present, the common lightning protection circuit will directly use varistors, overload protection devices, or Schottky tubes instead of transient diodes (TVS). The current will be greater than 40uA, so it may fail to identify during the DET stage of protocol identification, and overload protection devices often need energy accumulation to work, thereby increasing the response time and reducing the protection effect

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