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1、180IEEETRANSACTIONSONPOWERELECTRONICS,VOL.17,NO.2,MARCH2002ANovelResonantGateDriverforHighFrequencySynchronousBuckConvertersKaiweiYao,StudentMember,IEEE,andFredC.Lee,Fellow,IEEEAbstract—Thispaperintroducesanewresonantgatedriverforboththetopandbottomswitchesofasynchronousbuckcon
2、verter.Acoupledinductorisusedtoreducethesizeaswellastotransferenergybetweenthetopandbottomgatedriving.Apossiblesemi-conductorintegrationapproachisproposedforthisresonantgatedriverbasedonaself-adaptivecontrolmethod.Theoreticalanal-ysis,simulationandexperimentalresultsprovethatth
3、eproposeddrivercangreatlyreducethegatedrivinglossandthatitiswellsuitedtohigh-frequencyapplications.IndexTerms—Gatedrive,highfrequency,resonantgatedrive.I.INTRODUCTIONFig.1.Conventionalgatedriver.INCEthesynchronousbuckconvertercangreatlyreduceSconductionloss,itiswidelyusedinlow-
4、voltageandhigh-currentoutputapplications,ofwhichthevoltageregu-latormodule(VRM)formicroprocessorsisagoodexample.Toshrinkthesizeofthepowersupply,whichisespeciallyimportantinVRMapplications,theswitchingfrequencyisincreasedtoreducethepassivecomponents’size.However,oneissuerelatedt
5、ohigh-frequencyapplicationsisthesignificantgate-drivinglosses.Foraconventionalgate-drivingcircuitshowninFig.1,thegate-drivinglossisabout(1)HeretheswitchinganddrivinglossesofthesmalldrivingFig.2.Losscomparisoninasynchronousbuckconverter.MOSFETs(and)areignoredfortheirrelatedsmall
6、values.ThepowerMOSFETsdrivinglossisduetothechargingV,thetotalgate-drivinglossiscomparabletotheconductionanddischargingoftheequivalentinputcapacitorCissthroughlossat1MHzandevenhigherat2MHzswitchingfrequency.thegateresistanceRg.isthetotalgatechargewhentheSincethefulloutputpowerof
7、thesynchronousbuckconvertergateischargedtovoltagelevelandistheswitchingisonlyabout20W,thegate-drivinglossescandegradethetotalfrequency.Itisclearlyshownin(1)thatthegate-drivinglossefficiencybyabout5%atfullloadwithover1MHzswitchingisproportionaltotheswitchingfrequency.Thislosscou
8、ldbefrequency.Forthelower-outputvoltageapplications,wh
