Electronic switch circuit for power over Ethernet

Abstract

The invention discloses an electronic switch circuit for power over Ethernet. The electronic switch circuit comprises positive / negative input ends, positive / negative output ends, an output current sampling circuit, a control module and an electronic switch, wherein the electronic switch is connected between an input end and an output end of the electronic switch circuit in series; the electronic switch is turned on / off under the control of the control module according to an output current sampling value provided by the output current sampling circuit, and the electronic switch is turned off under the control of the control module to carry out current overload protection when output current is overloaded; and after the electronic switch is turned off, the output load condition is detected by the control module to restart the circuit. The electronic switch circuit disclosed by the invention has the advantages that overcurrent output control can be realized through the adoption of the electronic switch in the control of output, and output work is restarted under the condition that the output load returns to a normal value; and overload protection and short-circuit protection can be realized, and the requirement of application under loaded, power-on and other various conditions can be met.

Description

[technical field] [0001] The present invention relates to Ethernet power supply technology, in particular to an electronic switch circuit for Ethernet power supply. [Background technique] [0002] Power over Ethernet technology (POE) is more and more widely used in wireless coverage, security, and other occasions. In order to regulate various applications, the IEEE802.3 standard specifies two standard applications, of which the long-term power specified in the af standard is 13w, The long-term power specified in the standard is 25w. In applications that meet this standard, PSE (power source equipment) equipment must be used for power supply at the power supply end, and PD (power device) must be used for power receiving control at the power receiving end. Pass the standard A series of protocols and applications related to power detection and power limitation are specified. An application satisfying the standard protocol can implement a secure application. [0003] Due to th...

AI Technical Summary

Problems solved by technology

In these non-standard applications, the current market products only supply power to the network port output (mostly adopt 4,5 positive, 7,8 negative power supply mode), or only connect a resettable fuse in series in the loop, each Each port has no current limit, and the precise power limit of the port cannot be realized. These non-standard applications have great potential safety hazards; the action time of the recoverable insurance is very long, and the fault tolerance performance is poor.

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