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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。
Combined with the characteristics of high-speed data acquisition system in power grid, this paper presents a board-level noise reduction scheme by analyzing the noise of synchronous switch. Using the SIwave simulation tool, the plane division scheme of the analog-digital hybrid system is studied and the typical electromagnetic band Gap structure. The research shows that reasonable device layout and plane division can effectively restrain the interference between planes. The electromagnetic band gap structure can effectively suppress the high-frequency synchronous switching noise and can adjust the cutoff frequency range by adjusting the cell size, the number, the spacing and the plate thickness And isolation. Finally, the system-level and board-level noise suppression measures are applied to high-speed acquisition boards. The simulation results meet the requirements of power integrity. The design process is conducive to early detection and problem solving, enhancing system stability and providing a solid foundation for power system monitoring devices .