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1、低功耗流量测量技术研究摘要：随着微电子技术的快速发展，特别是一些性能稳定可靠的模块化、高集成度芯片及器件的问世，使得设计低功耗、便携式的现场检测仪表成为可能，也成为今后检测仪表及装置的发展趋势。而在流量测量应用中，电磁流量计作为无能量损耗的流量测量仪表，以其独特的性能特征，已广泛的应用于工业过程中的各种导电液体的流量测量，形成了独特的应用领域，成为应用越来越广泛的流量测量仪表。目前国内的电磁流量计，普遍为工频交流供电或24V直流供电方式，功耗较大，在仪表便携式和低功耗的要求上没有得到实现。本文对电池供电的电磁流量计进行了研究。对主要组成部分进行了低功耗设计，使
2、电磁流量计实现低功耗的工作要求。本文的测量电路主要是应用于由电池供电的电磁流量计中，从励磁方式和测量电路方面进行了低功耗设计，同时满足测量的精度要求，使得电磁流量计的电池供电成为可能，可以更好的适应野外现场作业等环境，满足仪表便携式、低功耗的要求。关键词：电磁流量计，运算放大器，双积分A/D转换，低功耗第36页共34页LowpowerlossflowmeasurementengineeringresearchAbstract：Alongwithmicroelectronictechnology'sfastdevelopment,speciallysomesta
3、blepropertyreliablemodulation,thehighintegrationratechipandcomponent'sbeingpublished,causestodesignthelowpowerloss,theportablesceneexaminationmeasuringappliancetobecomepossibly,alsowillbecomeexaminesthemeasuringapplianceandequipment'strendofdevelopmentfromnowon。Butintheflowmeasureme
4、ntapplication,theelectromagneticflowmetertakesthenon-energylosstheflowmeasurementmeasuringappliance,byitsuniqueperformancecharacteristic,thewidespreadapplicationincommercialrun'seachkindofelectricconductionliquid'sflowmeasurement,hasformedtheuniqueapplicationdomain,becomestheapplica
5、tionmoreandmorewidespreadflowmeasurementmeasuringappliance.Atpresentthedomesticelectromagneticflowmeter,generallyforthepowerfrequencyexchangepowersupplyorthe24Vcurrentpowersupplyway,thepowerlossisbig,portableandinthelowpowerloss'srequesthasnotobtainedinthemeasuringappliancerealizes.
6、Thisarticlehasconductedtheresearchtobatterypowersupply'selectromagneticflowmeter.Hascarriedonthelowpowerlossdesigntothekeycomponent,causestheelectromagneticflowmetertorealizethelowpowerlossworkrequirement.Thisarticlemeteringcircuitismainlyappliesinbyinthebatterypowersupplyelectromag
7、neticflowmeter,hascarriedonthelowpowerlossdesignfromtheexcitationwayandthemeteringcircuitaspect,simultaneouslysatisfiesthesurveytheaccuracyrequirement,enableselectromagneticflowmeter'sbatterypowersupplytobecomepossibly,mayenvironmentandsoonbetteradaptationopencountryfieldoperation,s
8、atisfythemeasuringa
