Novel lightning protection circuit for PoE (power over Ethernet) power supply system

Abstract

The invention discloses a novel lightning protection circuit for a PoE (power over Ethernet) power supply system; the novel lightning protection circuit comprises a PSE (Power Sourcing Equipment) direct-current power source, a switch control circuit, a first lightning protection circuit, and a second lightning protection circuit; positive output of the PSE direct-current power source forms a positive power supply end; the switch control circuit includes a plurality of MOS (metal oxide semiconductor) transistors and a PSE control chip that controls on and off of the MOS transistors; the MOS transistors are parallelly connected at one end and then connected to a negative pole of the PSE direct-current power source; outputs of the other ends of the MOS transistors form a negative power supply end; the first lightning protection circuit is connected between the negative pole of the PSE direct-current power source and a ground end; the second lightning protection circuit is connected between the positive pole of the PSE direct-current power source and the ground end. Fewer protective devices are used in the whole PoE power supply system, the novel lightning protection circuit is simpler, product competitiveness is improved, a simpler and more economic lightning protection solution is provided, and more sufficient placement space is provided for the miniature design of products.

Description

technical field [0001] The invention relates to the technical field of POE power supply protection, in particular to a novel lightning protection circuit for a PoE power supply system. Background technique [0002] The POE power supply system is divided into a standard POE power supply system and a non-standard POE power supply system. The advantage of the POE power supply system is that it can take power where there is a network interface but no mains wiring interface. The transmission medium is based on the current Ethernet wiring superimposed power transmission. , It is inevitable to appear in the open air, the mains are intertwined and other wiring scenarios, the power supply system is vulnerable to interference or damage by natural lightning strikes and the surrounding mains, high-voltage lines and other induction signals, the traditional lightning strike protection scheme for the power supply system came into being, but The required energy discharge devices are usually...

AI Technical Summary

Problems solved by technology

[0002] The POE power supply system is divided into a standard POE power supply system and a non-standard POE power supply system. The advantage of the POE power supply system is that it can take power where there is a network interface but no mains wiring interface. The transmission medium is based on the current Ethernet wiring superimposed power transmission. , It is inevitable to appear in the open air, the mains are intertwined and other wiring scenarios, the power supply system is vulnerable to interference or damage by natural lightning strikes and the surrounding mains, high-voltage lines and other induction signals, the traditional lightning strike protection scheme for the power supply system came into being, but The required energy discharge devices are usually twice the number of power supply ports, the number of required discharge devices is too large, and the initial investment cost is high, resulting in a large power supply system and certain limitations in wiring

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