三相精密程控标准源DDS结构优化设计  

Optimal Design of Three-Phase Precise Programmable Standard Source DDS Structure

作　　者：刘保连[1] 丁祖军[1] 李小光[2] 

机构地区：[1]淮阴工学院电子与电气工程学院,江苏淮安223003 [2]洛阳理工学院,河南洛阳471003

出　　处：《电测与仪表》2013年第11期87-91,共5页Electrical Measurement & Instrumentation

基　　金：江苏省高校自然科学基础研究面上项目(11KJB470002)

摘　　要：对传统DDS技术的频率分辨率、相位分辨率进行了分析，并对其结构进行了优化，使得频率分辨率、相位分辨率是10的负整数幂，不存在尾数，提高了DDS输出频率及相位的精度。通过合理选择采样点数、正弦值二进制位数，有效减小了由相位截断误差引起的运算杂散，提高了信噪比。在优化DDS基础上设计了三相精密程控标准源，能够叠加2~31次谐波，输出波形过渡平稳，无振荡及尖峰毛刺。输出基波电压以及电流误差小于0.05%，频率分辨率高。This paper optimizes the traditional DDS structure based on the analysis of frequency resolution and phase resolution of traditional DDS technology, which are negative power of 10 without mantissa. So the accuracy of frequency and phase is improved. Through the reasonable selection of sampling points number and sine value bits number, the spurs caused by phase truncation is effectively reduced and the SNR is raised. The paper designs the three-phase precise programmable standard source on the basis of optimized DDS, which can overlape 2~31 harmonic. The output wave transition is smooth without oscillation and peak burr. The error of output fundamental voltage and current is less than 0.05%and the frequency resolution is high.

关 键 词：标准源 DDS 相位累加器 频率分辨率 相位分辨率 精度 

分 类 号：TM933[电气工程—电力电子与电力传动]