一种科氏流量计的改进驱动电路研究  

Research on an Improved Driving Circuit of Coriolis Mass Flow Meter

作　　者：候山山 黄丹平[1,2,3] 徐同旭 郭康 张芯豪[1] 

机构地区：[1]四川理工学院机械工程学院,四川自贡643000 [2]人工智能四川省重点实验室,四川自贡643000 [3]固态酿造关键技术研究四川省院士(专家)工作站,四川自贡643000

出　　处：《四川理工学院学报（自然科学版）》2017年第5期37-43,共7页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

基　　金：过程装备与控制工程四川省高校重点实验室项目(GK201602)

摘　　要：稳定振动的流量管保证着科氏流量计流量测量的准确性,而维持流量管振动的关键是流量计驱动电路。现阶段科氏质量流量计模拟驱动存在一种驱动电路驱动一种型号一次仪表、电路离散元器件繁多、驱动信号幅值不稳定等问题,从而导致流量管振动不稳定,影响流量计算。针对其问题,改进模拟驱动电路,由VCA810和OPA820集成芯片组成的自动增益模块替代离散元器件组成的增益电路,由以TDA2030为核心芯片的集成功放模块代替原有功率放大电路。在驱动电路中,可调整增益模块稳幅单元来改变输出信号幅值,使驱动电路满足不同一次仪表对功率的需求,从而实现驱动多种型号一次仪表的功能。对所研发试验级驱动电路进行测试,实验结果表明所研发驱动电路可以驱动不同型号一次仪表,起振时间满足实际工况需求。The drive circuit is the key factor whether the Coriolis mass flow meter can work normally. Nowadays,the traditional analog drive system of Coriolis mass flow meter which consists of many discrete electronic components has common problems. First,much extra noise may be caused by discrete components which influence accuracy of measurement. Second,the traditional analog drive system has limited used range. In order to improve the performance of analog drive circuit,the integrated chip has been applied in the new analog drive circuit,which will decrease much noise. The VCA810 and OPA820 will be combined together to form auto gain module,and the TDA2030 will be the core of power amplifier module. In the improved analog drive circuit,one particular resistance of auto gain module has adjustable value,which can adapter to the power supply of different type flow meter. Experiments show that the new analog drive circuit has better effect compared with the traditional drive circuit.

关 键 词：改进电路 集成模块 平稳驱动 可调增益 

分 类 号：TN710[电子电信—电路与系统]