对以太网供电中高频脉冲网络变压器选用不当的担忧

Concerns About the Improper Selection of the High Frequency Pulse Transformer in the Power over Ethernet Network

以太网供电(Po E)是利用以太网中传输高速网络信号的5类线来输送直流电,取消上网链接的终端要使用的电源,既可以节约成本,又可以对用电设备通过软件来控制,达到绿色环保的目的。但是,在原有的局域网(LAN)线上加入了直流电流后,多数网络设备制造商对其中网络变压器(LAN transformer)的选择认识不足,在满足直流电流加载功能的同时,损伤了电磁兼容(EMC)能力,故此,导致网络链接过程中的断续问题,这就是该文担忧之所在。

The Power over Ethernet（Po E） is the use of Ethernet of the cat5 UTP cable to transfer direct current, do not need an adapter to supply the power to the end use, Po E technique can save cost, and can control the electric devices through network by software, achieve the goal of green environmental protection, but, while the dc current is joined on the original cable of the LAN network, many of the network equipment manufacturers have not understood the choice of the LAN transformer sufficiently, in order to meet the transferring of dc load current function at the same time, damage to the electromagnetic compatibility（EMC）, therefore, lead to intermittent problem in the process of network link, this is the paper concerns.