电网高速数据采集系统板级同步开关噪声抑制研究

Study on Board-Level Simultaneous Switching Noise Reduction of Power Grid High-Speed Data Acquisition System

结合电网高速数据采集系统的特点,通过对同步开关噪声的分析,给出了板级降噪方案,利用SIwave仿真工具,研究了模数混合系统的平面分割方案,并设计分析了典型的电磁带隙结构。研究表明合理的器件布局和平面分割可有效抑制平面间的干扰,电磁带隙结构可有效抑制高频段同步开关噪声,并可通过调整单元格尺寸、数量、间距及板厚等来调整截止频率范围和隔离度。最后将系统级和板级噪声抑制措施应用到高速采集板卡,仿真结果满足电源完整性的需求,设计过程有利于初期发现和解决问题,增强系统稳定性,为电力系统监控装置提供坚实的基础。

Based on the features of power grid high-speed data acquisition system and to enhance the stability of the system, by means of analyzing simultaneous switching noise （SSN） a board-level noise reduction scheme is given. Using simulation tool Slwave, a plane-partitioning scheme for hybrid analog-digital system is researched and a typical electromagnetic band gap （EBG） structure is designed and analyzed. Research results show that reasonable device layout and plane partitioning can effectively suppress the interferences between planes, the EBG structure can effectively restrain SSN in high-frequency section, and the cut-off frequency and isolation can be adjusted by modifying the size., amount, spacing of cells as well as the thickness of the plane. The noise reduction measures for system-level and board-level are applied to high-speed data acquisition boards and cards, and simulation results show that the requirement of power integrity is met. The design process is favorable to solve problems found in initial stage and enhance stability of high-speed data acquisition system.