低功耗电磁流量计的设计与实现

Design and Implementation of Electromagnetic Flowmeter with Low Consumption

传统电磁流量计大多采用交流220 V或直流24 V供电,励磁电流高达250 m A左右,耗能高,成本高。文中设计了一种基于MSP430F4794单片机的低功耗电磁流量计,采用3.6 V锂电池供电,励磁方式采用三值梯形波励磁,励磁电流仅为30 m A。围绕低功耗详细叙述了DC-DC升降压电路、三值梯形波励磁电路、信号处理电路、MSP430F4794单片机控制及外围电路。经实验测试,该电磁流量计能够满足用户需求。

Most of traditional electromagnetic flowmeters adopt AC 220 V or DC 24 V power supply. Their exciting current can be as much as 250 m A,and their energy consumption and cost are both high. Based on MSP430F4794 MCU,a kind of low power electromagnetic flowmeter was designed using 3. 6 V lithium batteries. Its excitation mode used three-valued trapezoidal wave way,and the exciting current was only 30 m A. Around low power,the DC-DC buck-boost circuit,three-valued trapezoidal wave excitation circuit,signal processing circuit,single chip microcomputer-MSP430F4794 and peripheral circuit were described. Experimental results show that it can satisfy customers＇ needs.