一种基于中值滤波法交流电流采样技术研究与应用

摘要

为了得到高精度的采样电流以满足控制需求，通过硬件校正A/D采样的增益误差与偏移误差，并在传统采样算法基础上加入了中值滤波法来对A/D采样的精度进行提高。基于TMS320F2812处理器搭建了实验平台，实验结果表明，采用A/D校正和中值滤波法可以很好地提高采样精度。%In order to obtain high-precision sampling currents to meet the control requirement, the gain error and offset error of analog to digital sampling were revised by the hardware. On the basis of traditional sampling algorithm the median ifltering was added to improve the sampling accuracy. The experimental platform was built up based on the digital signal processor TMS320F2812. The experimental results show that adopting analog to digital correction and median ifltering could improve the sampling accuracy well.