通过监测开关工作周期诊断指示灯

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