基于线性电源的单/双频电磁流量计励磁控制系统  

Linear regulator based single/dual frequency excitation control system for electromagnetic flowmeter

作　　者：杨双龙[1] 王刚 徐科军[1,3] 石磊 

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009 [2]重庆川仪自动化股份有限公司,重庆404001 [3]工业自动化安徽省工程技术研究中心,合肥230009

出　　处：《电子测量与仪器学报》2010年第2期147-152,共6页Journal of Electronic Measurement and Instrumentation

基　　金：国家863计划(编号:2008AA042207)资助项目;重庆市科学技术委员会项目(编号:CSTC2008AB2059)资助项目

摘　　要：研制电磁流量计励磁控制系统,提出基于线性电源设计恒流源电路,并采用高压源激励使系统具有快速响应性能,基于H桥设计励磁线圈驱动电路以进行方波激励,设计检流电路以实现励磁电流的准确检测,基于DSP设计励磁时序产生电路实现单频或双频精确励磁。经实验验证,该励磁控制系统可实现精确的高频或双频励磁并保证电磁流量计输出信号具有稳定零点,从而为提高其测量速度和测量精度奠定基础。Coil exciting is the precondition for flow measuring by magnetic flowmeter. The exciting method adopted is the key for improving measuring accuracy and speed. The excitation system for magnetic flowmeter is developed, and new methods are proposed, including the designing of current-regulator circuit based on linear voltage-regulator powered with high voltage to acquire fast response performance for the system, the designing of driving circuit for exciting coil by square wave based on H-bridge, the designing of current-measurement circuit used to measure exciting current accurately, the designing of exciting scheduling generating circuit based on DSP to realize exciting the coil by single or dual frequency precisely. The experimental results show that the excitation system can be used to excite the coil in the form of high or dual frequency precisely and synchronously assure that the output signal of magnetic flowmeter has steady zero. Thereby, this provides the foundation of improving the flowmeter’s measurement accuracy and speed.

关 键 词：电磁流量计 励磁控制系统 线性电源 高频励磁 双频励磁 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]