Backward feed equipment and power supply control method thereof

Abstract

The invention provides backward feed equipment and a power supply control method thereof. The backward feed equipment comprises a DCDC voltage converting unit, a plurality of interface units, a plurality of controllable switch units and a control unit, wherein each interface unit is connected with user equipment for supplying power when the connected user equipment is injected with the power supply; each controllable switch unit performs forward conduction when being turned on and stops conduction when being turned off; each controllable switch unit has an input end connected with one interface unit correspondingly and has an output end connected to the input end of the DCDC voltage converting unit; the control unit is used for judging whether each interface unit is capable of supplying power and is in the state of connection; and the control unit turns off the controllable switch units connected with the interface units capable of supplying power and in the state of connection and turns on the controllable switch units one by one. The backward feed equipment and a power supply control method thereof in the invention realize equal power division of backward feeding ports and accordingly enable the user equipment using the ports to obtain average power supply as much as possible.

Description

technical field [0001] The invention relates to the network field, in particular to a backfeed device and a power supply control method thereof. Background technique [0002] With the development of Ethernet technology, especially the birth of the IEEE802.3af standard, the technology of using Ethernet cables to transmit power has gradually become the mainstream, and more and more devices support Ethernet backfeed, including IP phones, digital video surveillance , WLAN access points and other low-voltage network-connected systems, using Ethernet backfeed, not only improves the flexibility of the system, but also reduces the complexity of user installation and use costs. [0003] At present, Ethernet backfeed equipment generally adopts figure 1 The shown scheme provides power to an Ethernet backfeed device. The user uses Midspan (midspan) or PSE (Power Sourcing Equipment, power supply equipment), and injects DC power into the corresponding Ethernet port of the backfeed equip...

AI Technical Summary

Problems solved by technology

for example figure 1 Among them, an Ethernet port of the backfeed device has power injection, and the power is finally sent to the DC / DC voltage conversion unit on the board to supply power to the system through the diode connected to the Ethernet port. At this time, there is 48V voltage, if a user feeds power to the device through another Ethernet port, and the voltage is lower than the 48V voltage at the DC / DC inlet, the diode connected to the Ethernet port will not conduct, so that the user cannot participate in feeding the device powered by

[0005] use figure 1 The scheme shown feeds power to the system. When one user supplies power, other users can use the service normally without power supply. When multiple users access at the same time, the power of the Ethernet backfeed device is provided by the user with the highest power supply voltage. ; This power supply method will increase the burden on power supply user equipment and affect the balance of the system, which is unfair to power supply users or users with high power supply voltage

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