电子秤中英文资料翻译Word下载.docx
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电子秤中英文资料翻译Word下载.docx
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Moreattentionhasbeenpaidonthedevelopmentoftheportabledigitalbalancewithcommercialworthsincetheusualmeasurershavebeenunpopularsuchaspolebalancespringbalanceandsomeothers.Theschemeoftheportabledigitalbalancewithhighperformanceandlowcostisputforward.Theideasforthesignalprocesscircuitisintroducedandthespeciehardwarechartismade.Thekeypartsoftheweighsensorelastomerarespecified.Moreovertheproblemstodealwiththecurrentandtheimprovementontheaccurationhavebeensolved.
Keywords:
digitalbalance;
elastomer;
poweramplifier;
measurementrangeconversion;
electricresource
CLC;
TH715.1+93DocumentCode:
Aliteraturenumber1007-7332(2001)04-0269-04
0Introduction
Developmentofscienceandtechnology,theweighingtechnologyputforwardhigherrequirements,especiallymicro-processingtechnologyandsensortechnology,tremendousprogresshasgreatlyacceleratedthisprocess.Currently,electronicscalesusedincommercialsaleshavebeenquitecommon,butallkindsofelectronicscalesarewidelyusedinthemarket,therearesignificantlimitations.Theseelectronicscaleslargevolume,highcost,needforfrequencyACpowersupply,andcannotcarry.Popularportableelectronicweighingscalesonthemarket,ortheyusearodtothespringcompression,tensiledeformationofthespringbalancetoachieve,suchasmetering,measurementerrorislarge,morethanoncespringelasticlimit,itwillgeneratealotoferrors,aswellasdamagetotherodtypescalesarecurrentlygoingoutofthemeteringequipment,therefore,aminiaturized,canbereplacedinthefuturedevelopmentofuniversalrodscaleselectronicscalesbythepeopleattachgreatimportancetodesignalightweight,easytocarry,accuratemeasurement,intuitivereadingscivilianelectronicscalesimminent.
Thisproductisfullyelectroniccircuitdesign,fullytakingintoaccounttheadvantagesofvarioustypesofelectronicscales,andsmallandportable,measurementerrorissmall(1%),reliable/lowpricesonthecivilianmarkethasgoodprospectsforuse.
1SystemPrinciples
Portableelectronicscalesystemshown(Figure1),whichconsistsofsensors,amplifiers,rangeconversioncircuit,A/Dconverterandadisplay/powersupplycircuitandthelike.
Straingaugesensorelementconsistingofaresistor,theweighingweaksignal,theprecisionofthedifferentialamplifier,twostages(0~2Kg,2~10Kg)automaticconversionrange,theA/Dconverter,saidamplifiedre-convertedintoananalogsignaltoadigitalliquidcrystaldisplay(LCD)display,theprocessingcircuitpowersupplyvoltageintothebatterypowersupplyvoltagelevelrequiredforthetypeofeachunitcircuit.
2loadcellselectionanddesign
Intheelectronicscalesystem,thesensoristhemostcriticalcomponentisalsopartofthedesignofelectronicscalesdifficulttodealwith,itsperformancedirectlydeterminestheaccuracyofelectronicscales.Small-scaleloadcellstructure,typeandmorecategories.Inordertomaketheloadcellhasgoodlinearity,stronginputsensitivityandstrongresistancetolateralloadforce,wehaveadoptedatwo-holeparallelbeamloadcell[1](Figure2),astheuseofdomestichardaluminumalloyLY12elastomermaterial,theelastichysteresisandcreepissmall,thesmall-scaleloadcell,thestorageofthismaterialislargerthanW,elasticmodulusissmall(about1/3ofsteel),themanufactureofsmalltheloadcellweighingscale,andtheidealmaterial.
Workingprincipleofthesensoris:
Whenthesensorissubjectedtoexternalloadsproleoftheupperandlowerbeamsparallelelastomerelasticdeformation/pasteinaparallelbeamoffourstraingaugesR1~R4consistsofbridgeoutputvoltageisgeneratedwithlinearizedexternalloadincrementp,pcanknowthesizeoftheexternalload.
Sizeofthesensoraccordingtothemaximumrangeoftheelasticelementmaybeprimarilydetermineddetectionpoint(peakstress)sectionthicknessh1,,todeterminetheformandsizeoftheopening,thesensorsensitivityisgenerallyrequire(1.5~2)mV/Vrange,thefull-bridgeTheoutputvoltageU0.
As
Where:
S-straingaugesensitivityfactor;
UCC--forthebridgevoltage
-DetectionPoint(straingaugeaffixedat)strain,
Also
Mp-detectionpointbendingmoment;
E-modulusofelasticityofthematerial;
W1-detectionpointflexuralmodulus;
Beacuse
(Similartriangles);
So
b-elasticelementwidth;
h1-sectionalthicknessdetectionpoint;
Mmax=pL/4-maximumbendingmomentsatbothendsoftheelasticelement;
p-Maximumweight;
l-doubleholecenterdistance;
L-lengthofelastomers
Canpush
Openholediameter
,
Thestiffnessratio
.
Thisvaluecanbeusedascalibrationvaluesestimatedelasticstiffnessisadequate.
Sizeelastomerdeterminedaccordingtotheaboveprinciples,itsprocessingbyconventionaltechnologystandards,throughtheheatoutofthelibrary,theopeninglinecutting,grindingandotherprocessesrequiredbyconventionalpatch
3amplifiercircuitdesignprocessingseveralproblems
(1)Power:
Thise-weighed2onthe5thordinaryzinc-manganesebatteries(3V)orrechargeablebattery(2.4V)powersupply.Foreachlevelofthesupplyvoltagecircuitforthisisnotenough,sothechoiceofswitchingtoBoostRegulatorManifoldTL499Aforpowerconversion(Figure3).
TheoutputvoltageoftheregulatorTL499Arangeofupto2.9~30V,outputcurrentof100mA,therequiredinputvoltagerangeof1.1~10V.TL499Athebatteryvoltageupto15V,7.5Vandthengetasymmetricalvoltageoutputthroughtheopamp.
(2)Reducetheinfluenceoftheequivalentoffsetvoltagemeasurementaccuracy;
bridgeoutputsignalissuperimposedonahighvoltageDCsupplymoldweaksignal,youshouldfirstensurethatthepowerbridgetogetahighdegreeofstability,constantcurrentbridgeusescircuitryasshownin(4)below.
BytheA1,R5,R6,R1constituteaconstantcurrentsourcecircuitforprovidingahighdegreeofstabilitybridgepowercircuit.R1-R4constitutingthedetectionresistancestraingaugebridgeforceduetotheactionoftheforcetodeformtheelasticbody,leavingacorrespondingchangeinstraingaugeresistance,therebyweakbridgeoutputvoltagesignalproportionaltotheforcebytheelasticbody,Rpiszeropotentiometertoadjustthebridgeoutputtozero.A2-A5andperipheralcomponentsofthedifferentialamplifier.Thecircuithasaninputimpedance(300-500mΏ)high,highcommonmoderejectionratio(110DB).Inputoffsetvoltage(20uv)andoffsetvoltagedrift(0.25-10uv/℃)smallfeatures,idealforthebridgeamplifiercircuitform.Circuitisdividedintotwo,thefirststageconsistsofA2,A3,therebytoimprovetheinputimpedanceoftheamplifiercircuit,thesecondstagebytheA4,A5constituteadifferentialamplifier,seekinganexactmatchtoA4externalresistor,whilelowergaincircuithasguaranteedsmalloffsetvoltage,Rwnumbertunethegainoftheamplifier.
(3)Achievescaletransformation,theelectronicscalerangeisdividedintotworanges,thefirstrange0-2Kg,secondrange2-10Kg,automaticconversionrangefromthecircuit(Figure5).
A/DconversionandtherealitycircuitICL7106completedbythemanifold,rangeconversionbychangingthereferencevoltageVREF7106implementation.WeighingcomparatorcircuitcomparestheoutputsignalofthedifferentialamplifiercomposedbyA6,whentheweighingscaleat0-1999grange,thesignalissmall,thecomparatordoesnotmovefromRp1adjustedreferencevoltagethroughanalogswitchesSW1,plustoVREFend7106;
whenweighingmorethan1999g,comparatorA6flipRP2obtainedbythereferencevoltagesignalviatheanalogswitchSW2to7106;
simultaneouslyoutputA6controlthepositionofthedecimalpointislitLCDdisplay.
4TestResults
Byactualmeasurement,theelectronicscaletechnicalindicatorsareasfollows:
Accuracydegreelevel:
3Maximumweighing:
10kg
Minimumscalevalue:
Range:
0-1999gtimeerror:
≤1%
1.999-10kgwhendrift:
<
0.1%/℃
Weight:
≤400gvolume:
about110mmx80mmx35mm
5Conclusions
Renamedsomeoftheperformancecharacteristicsofsomefailings,oneofwhichisthehighprice,afteraccountingcostabout120yuan;
Furthermorehighlinearityerror;
functionisstilllacking,suchastarefunction,computingfunctions.Theseneedtobeaddressedinafuturecircuitimprovements.Aselectronicscalessmall,easytocarry,suchastofurtherreducecostsinthecivilianmarketwillhavegoodprospectsforuseA/DconversionandtherealitycircuitICL7106completedbythemanifold,rangeconversionbychangingthereferencevoltageVREF7106implementation.WeighingcomparatorcircuitcomparestheoutputsignalofthedifferentialamplifiercomposedbyA6,whentheweighingscaleat0-1999grange,thesignalissmall,thecomparatordoesnotmovefromRp1adjustedreferencevoltagethroughanalogswitchesSW1,plustoVREFend7106;
SimultaneouslyoutputA6controlthepositionofthedecimalpointislitLCDdisplay.
焦作工学院(自然科学版),第20卷,第四期,2001年7月
中文译文:
便携式电子秤的研制
郭三明,郑均忠
(焦作工学院电气工程系,河南焦作454000)
摘要:
目前,市场上常见的杆式秤和弹簧秤等计量器具已逐步被淘汰。
因而,具有商用价值的便携式电子秤的研制受到了人们的高度重视。
鉴此,本文提出了高性能、低成本的普及型电子秤的全电子路线设计方案。
介绍了信号处理电路的设计思路,给出了具体的硬件设计框
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