基于INA193的电源电流高精度测定方法研究与实践  

Research and practice of high precision measurement of power current based on INA193

作　　者：关静[1] 胡圣尧[1] 杨子立[1] 于海平[1] Guan Jing;Hu Shengyao;Yang Zili;Yu Haiping(School of Electrical and Photoelectronic Engineering,Changzhou Institute of Technology,Changzhou 213032,China)

机构地区：[1]常州工学院电气与光电工程学院

出　　处：《电子测量技术》2019年第12期76-80,共5页Electronic Measurement Technology

基　　金：江苏高校品牌专业建设工程(PPZY2015B129);常州工学院科研基金(YN1515)项目资助

摘　　要：介绍了电流检测专用芯片INA193的应用电路,实测INA193的输出电压直流特性,通过DSP计算实际增益和偏移电压,建立修正输出电压实测值的修正方程式,从而减小与INA193输出电压理论值间的误差比例,达到提高检测电流精度的目的。实验结果表明,电流检测专用芯片INA193修正前输出电压实测值与理论值间误差比例高达-1.21^-1.55%,而修正后的输出电压值与理论值间误差比例减小到约0.1%。This paper introduces the circuit application of INA193 special chip current detection, the DC characteristics of output voltage through measuring INA193. Establish correction equation of corrected measured output voltage through calculating the real gain and offset voltage via the DSP, thus reducing INA193 output voltage error proportion comparing with the theoretical value, in order to enhance the precision of detected current. The experimental results show that, before correction, the proportion difference between measured values of the output voltage of INA193 special chip current and its theoretical value is as high as-1.21^-1.55%. This can be reduced to 0.1% after correction.

关 键 词：电流检测 高精度测量 数字信号处理 快速响应特性 INA193 

分 类 号：TN710[电子电信—电路与系统]