标签: high-brightness

Abstract:Achangeintheforwardvoltage(VF)forastringofseries-connected,high-brightnessLEDs(HBLEDs)canindicatedeteriorationorcompletefailureofoneormoreoftheLEDs.Accordingly,thiscircuitassessestheLED'shealthbymonitoringVF.Maxim>AppNotes>AmplifierandComparatorCircuitsDisplayDriversLEDLightingKeywords:high-brightnessLEDs,HBLEDs,forwardvoltage,differentialmeasurments,LEDdrivers,comparatorsJul30,2010APPLICATIONNOTE4479DiagnoseLEDsbyMonitoringtheSwitch-ModeDutyCycleBy:FonsJanssen,SeniorMemberoftheTechnicalStaffAbstract:Achangeintheforwardvoltage(VF)forastringofseries-connected,high-brightnessLEDs(HBLEDs)canindicatedeteriorationorcompletefailureofoneormoreoftheLEDs.Accordingly,thiscircuitassessestheLED'shealthbymonitoringVF.AsimilarversionofthisarticleappearedintheApril4,2009issueofEDNmagazine.Theforwardvoltage(VF)ofhigh-brightnessLEDs(HBLEDs)isoftenmonitoredtoassessthehealthof……

摘要：利用热电发电机（TEG）检测表面温度和升压开关稳压器，一个有用的水平提高甘醇输出，报警电路，闪烁的高亮度发光二极管的表面温度超过阈值时。Maxim>AppNotes>CircuitProtectionKeywords:hot-surfacewarning,SeebeckEffect,stepupswitchingregulator,boostregulator,thermoelectricgenerator,TEG,high-Dec06,2010brightnessLEDs,HBLEDsAPPLICATIONNOTE4535Hot-SurfaceWarningLightRequiresNoExternalPowerAbstract:Usingathermoelectricgenerator(TEG)tosensethetemperatureofasurfaceandastep-upswitchingregulatortoboosttheTEGoutputtoausefullevel,thiswarningcircuitflashesahigh-brightnessLEDwhenthesurfacetemperatureexceedsathreshold.AsimilarversionofthisarticleappearedintheFebruary4,2008issueofMachineDesignmagazine.Becauseahot-surfacewarninglightaffectspersonnelsafety,itmustoperatereliablywheneverthesurfaceishot.Heat,however,complicatesth……

摘要：正向电压(VF)的字符串串联连接、高亮度Led(HBLed)的改变可以指示恶化或完成的一个或多个指示灯的失败。因此，这种电路通过监测VF评估LED的健康。Maxim>AppNotes>AmplifierandComparatorCircuitsDisplayDriversLEDLightingKeywords:high-brightnessLEDs,HBLEDs,forwardvoltage,differentialmeasurments,LEDdrivers,comparatorsJul30,2010APPLICATIONNOTE4479DiagnoseLEDsbyMonitoringtheSwitch-ModeDutyCycleBy:FonsJanssen,SeniorMemberoftheTechnicalStaffAbstract:Achangeintheforwardvoltage(VF)forastringofseries-connected,high-brightnessLEDs(HBLEDs)canindicatedeteriorationorcompletefailureofoneormoreoftheLEDs.Accordingly,thiscircuitassessestheLED'shealthbymonitoringVF.AsimilarversionofthisarticleappearedintheApril4,2009issueofEDNmagazine.Theforwardvoltage(VF)ofhigh-brightnessLEDs(HBLEDs)isoftenmonitoredtoassessthehealthof……

摘要：此LED驱动电路包括迟滞控制器U1（MAX16820的），相关功率元件和控制电路的基础上的四运放U2（LMX324）。U1驱动从24V源5个高亮度发光二极管，使用唯一的电感L1，MOSFETQ1的，赶上二极管D1。Maxim>AppNotes>DisplayDriversLEDLightingKeywords:high-brightnessLEDs,HBLEDs,hystereticcontrollers,LEDdrivers,temperature-basedcurrentfoldbackNov19,2010APPLICATIONNOTE4509DCVoltageControlsPWMDimmingofHigh-BrightnessLEDs(HBLEDs)Abstract:ThisLED-drivercircuitincludesahystereticcontrollerU1(MAX16820),relatedpowercomponents,andacontrolcircuitbasedonthequadopampU2(LMX324).U1drivesfiveHBLEDsfroma24Vsource,usingonlyinductorL1,MOSFETQ1,andcatchdiodeD1.AsimilarversionofthisarticleappearedintheJune24,2008issueofElectronicDesignmagazine.High-brightnessLEDs(HBLEDs)aremakinginroadsintothemoretraditionallightingthatincludesaDCdistributionsystem(anexampleisthe24VMR-16trackli……