开关电源中有源EMI滤波器技术

随着开关电源开关频率的提高，EMI噪声污染越来越严重。这些日益严重的污染，使有源EMI滤波器技术得到了很广泛的应用，同时也对有源滤波技术提出了更高的要求。阐述了开关电源中有源EMI滤波器的基本原理并对其几种代表性的典型拓扑进行了概括分析，展望了今后一个时期内有源EMI滤波器的发展方向。指出有源EMI滤波器是开关电源及电力电子设备满足电磁兼容要求的一个重要研究方向，集成化、模块化、标准化是有源EMI滤波器发展的必然趋势。

Active EMI Filter Technology in Switch Mode Power Supply

Following the frequency raising of switch mode power supply, the EMI noise pollution was becoming more and more serious than before. These growing pollutions had resulted in widespread application of active EMI filter technology and in the meantime higher requirements were raised to active EMI filter technology. The basic principle of active EMI filter technology was described and summerized analysis on several representatively typical topology was carried out and it looked forward to the development direction of active EMI filters in a certain period of time in the future appointed out that active EMI filters were an important study direction to meet the requirements of electromagnetic compatibility in switch mode power supply and power electronic equipment, and integration, modularization and standardization are certain development trend for active EMI filters.