基于间歇励磁和信号重构的电磁水表变送器研制

doi:10.3969/j.issn.1000-1158.2021.09.07

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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0.4m3/h,量程比可达400。

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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

Abstract：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 0.4m3/h, and the turn-down ratio can reach 400.

Key words： metrology electromagnetic water meter intermittent excitation signal reconstruction three-value wave excitation turn-down ratio

收稿日期: 2019-12-10 发布日期: 2021-09-24

PACS:

TB937

通讯作者: 徐科军(1956-),男, 江苏无锡人,合肥工业大学教授,博士生导师,主要从事传感器技术、自动化仪表和数字信号处理方面的研究。Email:dsplab@hfut.edu.cn E-mail: dsplab@hfut.edu.cn

作者简介: 于新龙(1995-),甘肃武威人, 合肥工业大学在读研究生,主要研究方向为电气测量与系统智能控制。Email:377512419@qq.com

引用本文:

于新龙,徐科军,许伟,吴建平,闫小雪. 基于间歇励磁和信号重构的电磁水表变送器研制[J]. 计量学报, 2021, 42(9): 1160-1166.
YU Xin-long,XU Ke-jun,XU Wei,WU Jian-ping,Yan Xiao-xue. Development of Electromagnetic Water Meter Transmitter Based on Intermittent Excitation and Signal Reconstruction. Acta Metrologica Sinica, 2021, 42(9): 1160-1166.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2021.09.07 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2021/V42/I9/1160

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