摘要
针对一般电桥测量电路的输出量为模拟信号的问题,提出了一种具有模数转换(A/D:Analog-to-Digital)功能的数字电位器电桥测量电路。该电路由数字电位器、微处理器、电压比较器等芯片组成,实现了转换速度为226～926μs、测量相对误差小于0. 15%的A/D转换功能。经实验验证,该电路不仅能自动调节电桥平衡,还可实时测量且输出电桥可变电阻值或待测信号的数字量,该设计扩展了电桥的功能,省去一般采用电桥的电路系统中的A/D转换芯片,简化了电路设计。
Aiming at the problem that the output of general measuring bridge circuit is analog signal,a measuring bridge circuit with analog-to-digital conversion function applying digital potentiometer is proposed.The circuit is composed of a digital potentiometer,a microprocessor and a voltage comparator.A conversion rate of226~926μs and an error less than 0.15%are realized.The circuit can adjust balance automatically,and the digital value of variable resistor in bridge circuit or the digital of signal to be surveyed can be measured and output in real time.The circuit expended the function of bridge circuit,and eliminated the A/D conversion chip in the bridge circuit system and simplified the structure of circuit.
作者
孔德旭
李传南
KONG Dexu;LI Chuannan(College of Electronic Science and Engineering,Jilin University,Changchun 130012,China;State Key Laboratory on Integrated Optoelectronics,Jilin University,Changchun 130012,China)
出处
《吉林大学学报（信息科学版）》
CAS
2019年第3期305-309,共5页
Journal of Jilin University（Information Science Edition）
基金
国家自然科学基金资助项目(61177025)
吉林省科技发展计划基金资助项目(20130102009JC)
吉林大学2014年"大学生创新创业训练计划"基金资助项目(2014A51204)
