提出一种基于数字采样任意波形的交流信号真有效值计算方法。该算法通过等间隔采样获得信号一定时长的样本数据并对样本数据进行逐点平方，依据信号的最低频率分量和精度要求设计合适的数字低通滤波器，通过对信号样本平方序列进行低通滤波并对结果开方就可获得信号的真有效值。经过仿真分析和实际测量表明，该算法结果和波形无关，能够满足频率及波形随机变化的应用要求。%In this paper,the true RMS algorithm for AC signal based on digital sampling arbitrary waveform is presented, with which the certain duration sample data is acquired by equal interval sampling,and then squaring is proceeded point⁃by⁃point. The digital low⁃pass filter was designed according to the lowest frequency component and accuracy requirements of AC sig⁃nal. The true RMS of AC signal is obtained by conducting low⁃pass filtering of signal sample square sequence and squaring filtering results. Simulation analysis and practical measured results show that the result from the algorithm is independent of waveform, and can meet the application requirements of random variation for frequency and waveform.
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