new random pwm technique for a full-bridge

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1、IEEETRANSACTIONSONPOWERELECTRONICS,VOL.28,NO.11,NOVEMBER20135013NewRandomPWMTechniqueforaFull-BridgeDC/DCConverterWithHarmonicsIntensityReductionandConsideringEfficiencyYen-ShinLai,SeniorMember,IEEE,andBo-YuanChen,StudentMember,IEEEAbstractPWMtechniquesforafull-bridgedc/dcconverterEMIandwillaff

2、ectthenearbyelectronicdevices.Ingeneral,areinvestigatedandanewrandomPWMtechniqueisproposedelectromagneticcapability(EMC)standards,e.g.,CISPR,FCC,inthispaper.ThreePWMtechniqueswithconstantswitchingfre-VDE,etc.[1]–[3],shouldbeconsideredandcompliedwithforquencyarediscussedandtherelatedrandomPWMte

3、chniquesconverterdesignandproduction.Thetraditionalwaystoover-whichspreadtheharmonicclustersandgiveconstantaveragein-ductorcurrenttoreducetheoutputvoltageripplearediscussed.comethisproblemincludeaddingEMIfilter[4]–[6]orusingTheprosandconsofthreeconstantswitchingfrequencyPWMEMIshielding.However,

4、thesemethodswillincreasethecom-techniquesandtherelatedrandomcounterpartsareinvestigated.ponentcountsandcost.Ininvertercontrol,EMIsuppressionExperimentalresultsshowthatthereisasignificantefficiencydroptechniqueshavebeendevelopedforalongtime,andrecentlyoftherandomPWMtechniqueduetosignificantincreas

5、eofswitch-someofthetechniqueshavebeenmigratedfrominverterap-ingcounts.Therefore,thispaperpresentsanewrandomPWMtechniquetosignificantlyreducetheharmonicintensitywhilenotplications[7]–[10]toconverterapplications[11]–[15],suchcausingrelevantimpactontheefficiency.AnFPGA-baseddigital-asrandomPWMtechn

6、iquesorvariableswitchingfrequencycontrolledisolatedfull-bridgedc/dcconverterprototypeisbuilttotechniques.verifytheperformanceofconventionalandproposedPWMtech-RandomPWMtechniqueshavebeendevelopedformanyniques.Thespecificationsoftheconverterincludethefollowing:years.Itcanbeclassifiedintofourcatego

7、ries,includingrandominputvoltage=400V,outputvoltage=12V,outputpower=528W,andswitchingfrequency=100kHz.Measuredefficiencycarrierfrequencymodulationwithfixedduty(RCFMFD)[16],andharmonicspreadfactorwillbeusedfortheevaluationofthese[17],rando