浮选液位测量用高精度差分恒流源设计与优化  

Design and optimization of high precision differential constant current source for flotation level measurement

作　　者：陈启标 高云鹏[1] 杨唐胜[1] 李曦婷 王新宇 Chen Qibiao;Gao Yunpeng;Yang Tangsheng;Li Xiting;Wang Xinyu(College of Electrical and Information Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学电气与信息工程学院,长沙410082

出　　处：《仪器仪表学报》2024年第8期154-164,共11页Chinese Journal of Scientific Instrument

基　　金：国家重点研发计划(2021YFC2902700,2021YFC2902701)项目资助。

摘　　要：矿浆浮选液位测量作为选冶生产的关键环节,其测量系统中恒流源的准确性和稳定性直接影响最终产品质量。针对现有恒流源电路输出精度低、高频特性及带负载能力差等缺点,设计了一种新型高精度差分恒流源电路,通过在反馈回路和负载两端引入补偿电容,优化电路的高频特性,减小输出信号相移,并采用浮地接入负载,优化电路的负载特性,据此提高电路输出阻抗和带负载能力,最后完成对电路的仿真和实际测试。实际测量结果表明,所设计的新型恒流源在0~4 kΩ范围内实现100 Hz~50 kHz可调、0~20 mA恒流的效果更好,电路频率特性和负载特性显著提高,最大相对误差分别为0.513%和0.378%,满足矿浆浮选工业现场液位高准确测量的实际需求。Slurry flotation level measurement is a key link in the production of beneficiation,the accuracy and stability of the constant current source in the measurement system directly affect the quality of the final product.Aiming at the shortcomings of the existing constant current source circuit,such as low output accuracy,high frequency characteristics and poor load capacity,a new type of highprecision differential constant current source circuit is designed in this paper.By incorporating compensation capacitors at both ends of the feedback loop and load,the circuit′s high-frequency characteristics are optimized,reducing the phase shift of the output signal.Additionally,the load characteristics are enhanced using a floating access load.As a result,the circuit′s output impedance and load capacity are improved.The simulation and practical testing of the circuit demonstrate its effectiveness.Measurement results indicate that the newly designed constant current source achieves an adjustable range of 100 Hz to 50 kHz and a constant current of 0 to 20 mA within a 0 to 4 kΩrange.The circuit′s frequency and load characteristics show significant improvement,with maximum relative errors of 0.513%and 0.378%,respectively,meeting the high accuracy requirements for liquid level measurement in the pulp flotation industry.

关 键 词：矿浆浮选 恒流源 高精度 补偿电容 输出阻抗 

分 类 号：TD923[矿业工程—选矿] TH89[机械工程—仪器科学与技术]