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