通信电源的EMC技术研究

Research on EMC Technology of Communications Power Supply

从通信电源电磁骚扰的机理着手,分析了通信电源的开关电路及二极管的反向恢复时间引起的电磁骚扰。从减小搔扰源产生的搔扰信号,切断搔扰信号的传播途径,增强被搔扰体的抗搔扰能力三个方面分别提出相应的电磁抑制措施,讨论了电磁兼容设计中需要加以注意的有关问题。最后以车载通信电源为例,主要分析了在一个电源系统中多个子系统之间出现的电磁兼容问题,阐述了在设计时的基本思考及有关问题的解决方案。

The page begins at the mechanism of electromagnetic disturbance in oommunications power supply, and analyses the electromagnetic disturbance cansed by the power supply＇s switch circuit and the inverted resume time of diode. It continues to bring forward the corresponding measure to restrain the electromagnetic disturbance from three aspects： decreasing the disturb signals created by the disturb source, cutting off spread route of the disturb signals, and increasing the ability of disturbed part to resist the disturbance. It also discusses the related problems that should be noticed in EMC design. At the end, it takes the power supply of vehiclecarried eommunication equipment as an example, and mainly analyses the EMC problems appear among several subsystems of one power supply system; and expounds the basic ideas in design and the solution of the related problems.