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1、ADC-ACConverterUsingaiVoltageEquationalTypeSwitched-CapacitorTransformerIK.IshimatsuI.Oota,EUenoKumamotoIndustrialResearchInstituteKumamotoNationalCollegeofTechnology3-11-38HigashimachiKumamoto-shi,862JapanKumamoto-ken,861-11JapanAbstract-AnewtypeDGACconverterusingavoltageequa-F
2、ig.1showsthecircuitconfigurationofaconventionaltionaltypeSCtransformerispresented.Atestcircuitwhichconverter[6]usinganSCtransformer(thetransformerra-convertsDCvoltage(160V)toanACvoltage(100V/60Hz)tiois4)anditsclockwaveforms.InFig.1,thesymbols$ik,wasbuilt.Theexperimcmtalresultsof
3、theprototypeDC-AC$or,$,,and$Nareidealswitches.Thecharge-transferconvertershowthattheefficiencyisveryhigh(98%)anditscapacitorsC,(k=1-4)arealwaysconnectedinseries.Theoutputpowerislarge(300W).input-sideswitches9,(k-1-4)areclosedwhenthe4phaseI.INTRODUCTIONnon-overlappingclocks@ikare
4、inahighlevel,respectively.EachcapacitorC,ischargeduptotheDCinputvoltageV,Aswitched-capacitor(SC)transformerconsistsofonlycapacitorsandswitches.ItconvertsavoltagetootherbyInDut-sideswitchesVoltageselectorswitchesmeansofchangingtheconnectionofcapacitorsusingswitches.Recently,power
5、suppliesusingSCtransformersareapplicabletoDC-I)C[1]-[2],AC-DC[3]-[4],DC-AC[SI-[6],andAC-ACconverters[7].Theseconvertersaresmallsizeandlightweight,sincetheydon'thavemagneticpartssuchascoilsandlransformers.However,theconven-tionalconverterscouldnotrealizehighpowerandhighef-ficienc
6、y,sincetheinputcurrentflowsnon-continuously.Themaximumpowerofthe(conventionalconverterswaslessthan-IdealswitchesA'-100Wandthehighestefficiencyofthesewaslessthan95%.Inthispaper,anewDC-ACconverterusingavoltageequationaltypeSCtramformerispresented.Thefeatures....ofthiscircuitareasf
7、ollows.(1)Theoutputpowerislarge....anditsefficiencyishigh,sincetheinputcurrentiscontinu-........ous.(2)Appliedvoltageofeachcharge-transfercapacitorislow.AprototypeDC-ACconverterisbuiltandtestedtoconfirmthecharacteristics.ThetestcircuitconvertsaDCvoltage(160V)toanACvoltage(100V/6
8、0Hz).11.CIRCUITCONFIGURATIONANDPRIN-CIPLE:OFOPE
