以太网供电技术及受电端电路设计

为解决具有以太网接口的小型功率设备供电不便的问题,在分别分析IEEE 802.3af标准中的以太网供电系统构成、以太网供电传输方式、以太网供电过程及其他电气特性的基础上,提出了一种通过以太网获取电源的解决方案,并给出了详细的电路设计原理图。该方案可同时支持以太网供电输入和其他辅助电源输入,并可以同时输出3.3 V和5 V这2种电压供系统使用。测试结果表明,该设计方案具有较低的成本和较高的效率,能够很好地解决小型功率设备供电不便的问题。

Technology of Power over Ethernet and the Circuit Design for Powered Device

To overcome the inconvenience of supplying power to small devices with Ethernet interface,based on the analysis on the architecture of the power over Ethernet(PoE) system in the standard of IEEE 802.3af,the transmission pattern of PoE,PoE process and other electrical features,the solution using Ethernet interface to get power supply and the design principle of the circuit are proposed.The solution supports PoE input and other auxiliary power supply input;meanwhile it outputs 3.3V and 5V voltages for system use.The result of test shows that this design scheme features low cost and high efficiency,it well solves the inconvenience of power supply for small devices.