计量学报2011，Vol.32Issue(3)：193-197,5.DOI:10.3969/j.issn.1000-1158.2011.03.01
基于高低压电源切换的双环恒流控制电磁流量计励磁控制系统
High/Low Voltage Power Switching Based on Dual-Loop Constant Current Control for Electromagnetic Flowmeter Excitation Control System
摘要
Abstract
Based on the simulation analysis of constant excitation current control, a novel method of dual-loop control for constant excitation current control is proposed in order to improve high-frequency square wave excitation performance of the electromagnetic flowmeter. This method includes an outer loop for high/low voltage power switching and an inner loop for current fine-tuning, which can ensure ero satiability of the sensor output signal and high power efficiency of the excitation system when electromagnetic fiowmeter is excited by high-frequency square wave. A square wave excitation control system is designed to realize to excite the coil by high frequency precisely. The simulation results show that the higher the high voltage power,the more widely the excitation frequency can be expanded. The experimental results show that the speed of constant excitation current control is fast and the sensor output signal of the electromagnetic fiowmeter has steady zero when the excitation system is excited by high-frequency square wave.关键词
计量学/电磁流量计/励磁控制/电源切换/双环恒流控制/高频励磁Key words
Metrology/ Electromagnetic flowmeter/ Excitation control/ Power switching/ Dual-loop constant current control/ High-frequency excitation分类
通用工业技术引用本文复制引用
杨双龙,王刚,徐科军,石磊,李积春..基于高低压电源切换的双环恒流控制电磁流量计励磁控制系统[J].计量学报,2011,32(3):193-197,5.基金项目
"863"计划重点项目(2008AA042207) （2008AA042207）
重庆市科学技术委员会项目(CSTC 2008AB2059) （CSTC 2008AB2059）
