基于间歇励磁和信号重构的电磁水表变送器研制  

Development of Electromagnetic Water Meter Transmitter Based on Intermittent Excitation and Signal Reconstruction

作　　者：于新龙 徐科军[1] 许伟[1] 吴建平[1] 闫小雪 YU Xin-long;XU Ke-jun;XU Wei;WU Jian-ping;Yan Xiao-xue(School of Electrical and Automation Engineering,Hefei University of Technology,Hefei,Anhui 230009,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽合肥230009

出　　处：《计量学报》2021年第9期1160-1166,共7页Acta Metrologica Sinica

摘　　要：针对电磁水表低功耗的要求,提出间歇励磁方式,每周期进行一次三值波励磁;针对电磁水表需要在励磁电流小、传感器输出信号非常微弱的条件下实现极低测量下限的要求,提出信号重构滤波的处理方法,将幅值解调后的信号重构为矩形波信号,以便对信号进行梳状带通滤波,从而保证电磁水表的测量准确度。研制了基于MSP430低功耗单片机的变送器,并进行水流量标定实验,结果表明:该系统满足1级水表的测量准确度,且流量测量下限可达0.4 m^(3)/h,量程比可达400。To meet the requirements of low power consumption of electromagnetic water meters,an intermittent excitation method was proposed, and three-value wave excitation was performed every cycle. In response to the requirements of electromagnetic water meters to achieve a very low measurement lower limit under the condition of a small excitation current and a very weak sensor output signal,a processing method of signal reconstruction filtering was proposed to reconstruct the amplitude demodulated signal into a rectangular wave signal,so as to facilitate the comb band-pass filtering of the signal,thereby ensuring the measurement accuracy of electromagnetic water meters. The transmitter based on the MSP430 low-power MCU was developed and the water flow calibration experiments were carried out. The results show that the system can meet the measurement accuracy of the first-class water meter,and the lower limit of flow measurement can reach 0. 4 m^(3)/h,and the turn-down ratio can reach 400.

关 键 词：计量学 电磁水表 间歇励磁 信号重构 三值波励磁 量程比 

分 类 号：TB937[一般工业技术—计量学]