Protection circuit for multi-port POE (power over Ethernet) power supply output shunt

A technology for protecting circuits and power supplies, which is applied in the direction of protection against overcurrent, which can solve the problems of uncontrollability and long delay time, and achieve the effects of short delay time, reliable circuit and multiple control methods.

Inactive Publication Date: 2013-02-06
深圳市虹远通信有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem that the delay time of the protection mode of the power supply port of the existing POE power supply is too long and cannot be controlled, the present invention provides a protection circuit for the output branch of the multi-port POE power supply

Method used

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  • Protection circuit for multi-port POE (power over Ethernet) power supply output shunt
  • Protection circuit for multi-port POE (power over Ethernet) power supply output shunt
  • Protection circuit for multi-port POE (power over Ethernet) power supply output shunt

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0045] Such as figure 1 As shown, the protection circuit for the output shunting of the multi-port POE power supply in the embodiment of the present invention includes a switch circuit 1, a sampling device 2 and a judgment control system 3; the switch circuit 1 includes a switch control device 11 and a switch device 10 connected to each other , the switch device 10 is connected to a power supply port of the POE power supply; the sampling device 2 is connected to the switch device 10; the input terminal of the judgment control system 3 is connected to the sampling device 2, and its output terminal is connected to the switch device 10 through the switch control device 11; The judging control system 3 judges whether an overcurrent or a short circuit occurs at the power supply port through the sampling signal obtained from the sampling device 2. Wh...

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Abstract

The invention provides a protection circuit for a multi-port POE (Power Over Ethernet) power supply output shunt. The protection circuit for the multi-port POE power supply output shunt comprises a switch circuit, a sampling device and a judgment control system, wherein the switch circuit comprises a switch device; the switch device is connected with a power supply port of the POE power supply; the sampling device is connected with the switch device; an input end of the judgment control system is connected with the sampling device; and an output end of the judgment control system is connected with the switch device; the judgment control system judges whether the power supply port is in overcurrent or in short circuit through a sampled signal acquired from the sampling device; and when the power supply port is in overcurrent or in short circuit, the judgment control system controls the switching off of the switch device. The protection circuit for the multi-port POE power supply output shunt is accurate in control way, so that unnecessary delay in a traditional way is avoided.

Description

technical field [0001] The invention relates to an overcurrent and short circuit protection circuit, in particular to a protection circuit for output branching of a multi-port POE (Power Over Ethernet, power supply system based on Ethernet) power supply. Background technique [0002] The multi-port POE power supply requires that the port can stop output when one or more power ports have overcurrent, short circuit and other faults, and the output can be resumed when the fault is eliminated, while not affecting the normal output of other power ports. [0003] Most of the current technologies are to connect the self-recovery fuse in series in the output circuit, and a large current flows through the self-recovery fuse during overcurrent or short circuit, so that the impedance becomes larger after heating, thereby limiting the output current. Typical circuit such as figure 1 As shown, taking the 100M POE power supply as an example, after the power supply port is loaded, the cur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/08
Inventor 袁辉曹满欣郑继焕廖德祥
Owner 深圳市虹远通信有限责任公司
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