数字比例交流电桥关键技术研究  

Research on the Key Technology of the AC Digital Ratio Bridge

作　　者：王智炜 李琛恭 杨雁[3,4] 黄璐 WANG Zhiwei;LI Chengong;YANG Yan;HUANG Lu(Institute of Electrical Engineering,Yanshan University,Qinhuangdao,Hebei 066004,China;Institute of Electrical and Information Engineering,Hunan University,Changsha,Hunan 410082,China;National Institute of Metrology,Beijing 100029,China;Key Laboratory of Electrical Quantum Standards,State Administration for Market Regulation,Beijing 100029,China)

机构地区：[1]燕山大学电气工程学院,河北秦皇岛066004 [2]湖南大学电气与信息工程学院,湖南长沙410082 [3]中国计量科学研究院,北京100029 [4]国家市场监督管理总局重点实验室(电学量子基准),北京100029

出　　处：《计量学报》2025年第1期30-35,共6页Acta Metrologica Sinica

基　　金：国家重点研发计划项目(2022YFF0605503);国家市场监管总局质量技术基础能力建设专项(ANL2303)。

摘　　要：基于一种电桥自动辅助平衡算法,对数字比例交流电桥装置进行了改进。改进的数字比例交流电桥能够有效减小中心支路电位对测量结果的影响,实现了自动化快速测量。引入高精度电压跟随器实现模拟开关与桥路、采集卡的有效隔离以提升测量精度。对采集卡采集到的电压比例进行修正,修正后的电压相对比例误差小于10μV/V。将改进型数字比例交流电桥装置与传统四端对交流电阻电桥进行对比实验,在典型频率下数字比例交流电桥的测量不确定度优于1×10^(-5)。Based on an automatic auxiliary balancing algorithm for bridges,the digital proportional AC bridge device is improved.The improved digital proportional AC bridge can effectively reduce the influence of the central branch potential on the measurement results,and realize automatic and fast measurement.A high-precision voltage follower is introduced to effectively isolate the analog switch from the bridge and the acquisition card to improve the measurement accuracy.The voltage ratio collected by the capture card is corrected,and the corrected voltage relative proportional error is less than 10μV/V.The improved digital proportional AC bridge device is compared with the traditional four-terminal AC resistance bridge,and the measurement uncertainty of the digital proportional AC bridge is better than 1×10^(-5) at typical frequencies.

关 键 词：电学计量 交流电阻 数字比例交流电桥 自动平衡 

分 类 号：TB971[一般工业技术—计量学]