标签: 温度检查

Variousconcernsmustbeaddressedwhendealingwithtemperaturesensingapplications,whichfallintotwobroadcategories:precisiontemperaturemeasure-mentandsystemthermalmanagement.Precisiontemperaturemeasurementapplications(suchasthoseencounteredintheprocesscontrolindustry)requirehighlyaccuratetemperaturesensors.Applicationsofthistypefrequentlyuseathermocouple(orhigherprecisionsensor)inconcertwithlowoffset/lowdriftanaloginterfacecircuitstoacquireandconditionthetemperaturesignalwithminimumerror.Sensorabsoluteaccuracyandlinearityareprimaryconsiderations;sensorcostisasecondaryissue.Systemthermalmanagementschemes,ontheotherhand,regulatethecreation(and/ordisposal)ofheatwithinthesystem.Examplesofsystemthermalman-agementapplicationsareCPUover-temperaturedetectorsinpersonalcomputersandthermalshutdowncircuitsinpowersystems.Thetemperaturesensormustbeaccurateenoughtodetectwhentemperatureisapproachingtheupperboundryofthe“safe”operat-inglimit.Typically,fullscalesensormeasurementerrorsof2°Cto5°Careadequateforsuchapplications.Theprimaryconcernsinsensorselectionaresensorcost,size,andeaseofinterfacetotheprocessor.TB067TemperatureSensorStrategiesKeepSystemThermalProblemsinCheckAuthor:MicrochipTechnologyInc.OVER-TEMPERATURESHUTDOWNHeatsinkingthehighpowerdissipationdevicesinasystemisthesimplestthermalmanagementstrategy.INTRODUCTIONInthiscase,onlythesystemmustbemonitoredforVariousconcernsmustbeaddressedwhendealingcatastrophicover-temperatureconditionsduetoawithtemperature……