Variants of current-mirror circuits for reducing current imbalance in parallel LED strings

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1、VariantsofCurrent-MirrorCircuitsforReducingCurrentImbalanceinParallelLEDStringsSinanLiS.Y.(Ron)HuiDepartmentofElectrical&ElectronicEngineeringDepartmentofElectrical&ElectronicEngineeringTheUniversityofHongKongTheUniversityofHongKongHongKong,China&ImperialCollegeLondonEmail:

2、sean861031@gmail.comEmail:ronhui@eee.hku.hk&r.hui@imperial.ac.ukAbstract—Current-mirror(CM)circuitshavebeenbasicswitchedmodepowercircuitwithcurrentfeedbackcontrol.circuitcomponentsinmanyanalogandintegratedcircuitByeliminatingtherequirementofapowersupplyand/ordesigns.Theircu

3、rrentcontrolpropertiesmakethemattractivesophisticatedswitchedmodefeedbackcontrol,theproposalincurrentbalancingapplications.Inthispaper,arangeofofferssimpleandelegantsolutiontocurrentbalancingofvariantsofCMcircuitsapplicabletoreducingcurrentparallelLEDstringsatlowcost.Thispa

4、perwillpresenttheimbalanceinparallelLEDstringswithoutusingaseparatefundamentalcharacteristicsof(i)standard,(ii)Wilsonandauxiliarypowersupplyarepresented.Thefeaturesincluding(iii)improvedWilsoncurrent-mirrorcircuits(iv)self-advantagesanddisadvantagesareaddressedandcommented.

5、configurableCMcircuitsforreducingcurrentimbalanceinPracticalresultsoftheirapplicationsinhigh-powerLEDparallelLEDstringswithoutusingawell-regulatedcurrentsystemswithparallelstringsareincludedandusedtohighlightreferencesource.Itmustbepointedoutthatthesecircuitsaretheirperform

6、anceforcomparisonpurposes.notnew.ThecontributionhereistoprovideacriticalreviewwiththefocusontheirsuitabilityinreducingcurrentI.INTRODUCTIONimbalanceinparallelLEDstrings.Inparticular,thepracticalLEDhasemergedasanewtechnologytoreplaceaspectsofthesecircuitsthatcausetheirperfor

7、mancetraditionallightingdevices.[1].Duetotheslightvariationsdeviatingfromtheidealsituationareaddressed.PracticalamongindividualLEDdevices,thecurrentsinparallelLEDmeasurementsareincludedtodemonstratethesepracticalstringsareusuallynotidentical.Thiscurrent-imbalanceissues.prob

8、lemhasthepotentialdangerofcausingover-currentsituationinsomeLEDstringsandconsequen