Ethernet power supply equipment interface circuit and Ethernet power supply equipment

Abstract

The embodiment of the present application provides an interface circuit of a power over Ethernet device and a power over Ethernet device. The interface circuit includes: a first MOS transistor, a second MOS transistor, a current balance module, a first network transformer, and a socket, wherein the current balance module uses The current between the data line pair of the balanced socket and the idle line pair of the socket; the first MOS tube is connected to the first network transformer, and the first network transformer is connected to the two pairs of data lines of the socket; the center tap of the first network transformer The positive pole is connected to the positive terminal of the POE, the negative pole of the center tap of the first network transformer is connected to the negative pole of the first PSE; the second MOS tube is connected to the current balance module, and the current balance module is connected to the idle line pair of the socket. The balance of the current and power of the two channels is realized, the situation that the output power of the single channel of the PSE chip is too large, the life of the PSE chip is increased, and the heat generation and damage caused by the excessive current of the single channel are reduced.

Description

technical field [0001] The present application relates to the technical field of power over Ethernet, and in particular, to an interface circuit of a power over Ethernet device and a power over Ethernet device. Background technique [0002] POE (Power Over Ethernet, Power over Ethernet) refers to the use of some IP-based terminals (such as IP phones, wireless access points, etc.) without any changes to the existing Ethernet Cat.5 wiring infrastructure. , network cameras, etc.) while transmitting data signals, it can also provide DC power supply technology for such devices. A complete POE system includes two parts: PSE (Power Sourcing Equipmen, power supply equipment) and PD (Powered Device, power receiving equipment). The PSE device is the device that supplies power to the Ethernet client devices and is also the manager of the entire POE power supply process. The PD device is the PSE load that receives power, that is, the client device of the POE system. [0003] In the p...

AI Technical Summary

Problems solved by technology

[0004] The inventor found in the research that when the above method is adopted, the two-channel power supply of the PSE chip will cause the load current transmitted by the two channels to be unbalanced due to the PCB (Printed Circuit Board, printed circuit board) wiring and the network transformer. problem, and the greater the output power, the more obvious the imbalance of the load current, resulting in the current difference between the idle line pair and the data line pair. And it will lead to excessive output power of the PSE chip, which will affect the life of the PSE chip

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