家用电器产品通用标准解析-2

Experienceyoucantrust.家用电器通用标准IEC/EN60335-1技术要点介绍主讲:吴丽(Sarah)1.Powerinputtest:.Thepowerinputoftheapplianceatratedvoltageandatnormaloperatingtempshallnotdeviatefromtheratedpowerinputshownintable.Somepointsmustbenoticed:1)Complianceischeckedbymeasurementwhenthepowerinputhasstabilized.2)Allcircuitswhichcanoperatesimultaneouslyareinoperation.3)Theapplianceissuppliedatratedvoltage.4)Theapplianceoperatesunderthenormaloperation(load).Inmanypart2standardsoftheEN60335havethespecificdefinitionforthenormaloperation(load)correspondingtothevariousofproducts.5)Ifthepowerinputvariesthroughouttheoperatingcycle,thepowerinputisdeterminedasmeanvalueofthepowerinputoccurringduringarepresentativeperiod.2.Temprisetest(heatingtest):Wesupplythevoltagetotheheatingapplianceandthemotoroperatedappliance.Heatingappliance:1,15timesratedpowerinput.Motoroperatedapplianceandcombinedappliance:between0,94timesand1,06timesratedvoltage.2)TestingPosition:Asfaraspossibletosimulatenormalpositionofuse.Testcorneriscommonlyusedinthetesting.3)Weusetheresistanceandthermocouplemethodtomeasuretemp.Thermocouplemethodintroduction:Ifyoumeasurethetempofliveparts,pleaseinsulatetheliveparts.TypeK:Temprange:0~1200Cdegree.(NiCr--NiAl)Thermocouplefixationissue:TCjunctionshallbeinallcaseingoodcontactwithsurfacewhenmeasuringthesurfacetemperature.Thejunctionshallbeweldedandnottwistedtogether.ThejunctionshalllooklikeasmallpearlwiththewiresstickingoutatanangleTwistedwiresnotonlyhaveanundefinedjunctionpositionbutmayhaveotherdefectsaswell.Tapeandglueandsoldering:Water-glass(liquidandintendedasglue)isfineforglasssurfacesandveryhotplaces,buttaketimetodry.Tapecoveringthejunctionisfine.Usepressuresensitivetapefortemperaturebelow70[C]andthermosettingtapeforhighertemperatures.Forextremetemperaturesusethermosettingglassfibretape.Solderingorbrazingisfineforsomesituations.Thermocouplesusedfordeterminethetemperatureriseofthesurfaceofwalls,ceilingandfloorareattachedtothebackofsmallblackeneddisksofcopperorbrass,15mmindiameterand1mmthick,Thefrontofthediskisflushwiththesurfaceofboard.Dullblack-paintedplywoodapproximately20mmthickisusedfortestcorner.4)Whereiscriticalplacenormallywewanttomeasurethetemp?a)Surfaceoftheinsulation;b)Attheplaceswherefailurecouldcauseashortcircuitc)Contactbetweenthelivepartsandaccessiblemetalpartsd)Bridgingofinsulationorreductionofcrandcl.e)Safetycomponents.f)Mountingsurfaceandsupportingsurface.g)Accessiblesurface.5)Protectivedeviceshallnotoperate.Protectdevice:theoperationofwhichpreventsahazardoussituationunderabnormaloperationconditions.Itcanbeover-currentprotectionlikecurrentlimitingdevice,templimitingdevicelikethermalcut-outetc.Keywords:underabnormaloperationconditions.Ifthethermostatoratemperaturelimiterismountedonaheat-conductingpart,youshallmeasurethetwoplaces,oneismountingsurfaceandanotheris5mmfromthecomponentconcerned.3.Abnormaltest;Itisareasonablyforeseeablemisuse(carelessoperation)andsinglefaultcondition.Tosimulatetheforeseeablemisuseaccordingtotheproductsfeature.Thermostat:Temp-sensingdevice,theoperatingtemperatureofwhichmaybeeitherfixedoradjustableandwhichduringnormaloperationkeepsthetemperatureofthecontrolledpartbetweencertainlimitsbyautomaticallyopeningandclosingacircuit.Keyword:duringnormaloperation.Temperaturelimiter:Temp-sensingdevice,theoperatingtemperatureofwhichmaybeeitherfixedoradjustableandwhichduringnormaloperationsoperatesbyopeningorclosingacircuitwhenthetempofcontrolledpartreachesapredeterminedvalue.Keyword:duringnormaloperation.Thermalcut-out:devicewhichduringabnormaloperationlimitsthetempofthecontrolledpartbyautomaticallyopeningthecircuitorbyreducingthecurrentandconstructedsothatitssettingcannotbealteredbytheuser.Keywords:duringabnormaloperation.Self-resettingthermalcut-out:Thermalcut-outwhichautomaticallyrestoresthecurrentaftertherelevantpartoftheappliancehascooleddownsufficiently.Non-self-resettingthermalcut-out:Thermalcut-outwhichrequiresamanualoperationforresettingorreplacementofapart,inordertorestorethecurrentThermallink:Thermalcut-outwhichoperatesonlyonceandthenrequirespartialorcompletereplacement.SotheThermallinkandThermalcut-outarekindofprotectivedevice.Pleasenoticethatsamecomponentcouldbeasthermalcut-outorthermostatintheappliancesometimesbutnotalways.Whetheritisthermalcut-outorthermostatisaccordingtotheoperationcondition:normalorabnormal.Ifsomethingisoperatedinthenormaloperation,youshalldotheshortcircuitintheabnormaltest.AbnormaltestforheatingelementincludingthetubularsheathandPTCSeriesmotor:(a.c.andd.c.seriesmotor,universalmotor)Tolosethespeedismostimportantthingtobeevaluatedforseriesmotor.(mechanicalhazards)Lockingthemotor:Stalledconditions:case1:Lockingtherotorifthelockedrotortorqueissmallerthanthefullloadtorque;Case2:Lockingmovingpartsofotherappliance.Electroniccircuit:Fortheelectroniccircuitwhichareincorporatingtheelectroniccomponentandsuchelectroniccomponentsarenotsafetycomponents,thereliabilityofthecircuitmustbenoted.Generalrequirement:Electroniccircuitsshallbedesignedandappliedsothatafaultconditionwillnotrenderthe