基于CPLD交流采样同步优化方法的设计与实现

介绍了一种应用于交流采样单元中的动态采样间隔调整法的设计与实现。首先,分析了交流采样中采用动态调整采样间隔法的工作原理及其产生误差的原因,在此基础上找出了采用该方法计算取整时所得余数与舍入法之间的规律,并指出该规律能够有效减小动态调整方法的运算量。最后给出了该方法的CPLD实现形式,简化了其实现过程的复杂度。现场运行结果表明,利用此法能有效地减小同步误差,提高测量精度。

Design and application of an optimization method for synchronous sampling based on CPLD

The design and application of a method, which is used in AC sampling unit, for dynamic adjusting synchronous-sampling-time-value is introduced. First, the theory of dynamic adjusting synchronous-sampling-time-value is described, and the reasons of causing errors are analyzed. Based on these, a rule between the R (round (T/N)) and dynamic adjusting synchronous-sampling-time-value is found, and its advantage of reducing dynamic adjusting calculation is pointed out. Finally, the implementation form based on CPLD is given and it has simplified the realising process. The practical operation demonstrates the method can efficiently reduce the synchronous errors, and improve the accuracy of unit sampling.