基于 NIOSII 的电能表现场校验仪系统设计

摘要

To solve the problems of alternating current and voltage synchronous sampling and low operational preci -sion, a NIOSII based field calibrator for electric energy meters has been developed and designed in this paper .The o-verall structure of the system , the voltage sampling module , the current sampling module , the A/D conversion module and the zero-crossing detecting circuit as well as the software developing flow have been presented .Comparing with the traditional implementing strategy of DSP or special metering IC , the proposed design is flexible and will offer rapid and accurate performance .The results of test indicate that the system will operate stably and accurately .%为了解决多路电压、电流同步交流采样以及运算精度不高的问题，设计开发了基于NIOSII的电能表现场校验仪。给出了系统架构、电压采集模块、电流采集模块、A／D转换模块、过零检测电路和软件开发流程。相对于传统的DSP或专用计量芯片实现方案，该设计具有设计灵活、处理速度快、运算精度高等特点。测试结果表明，该系统工作稳定、误差小。