简介:Thezero-voltagequasi-resonantboostswitchingDC-DCconverterhasbeeninves-tigatedbyusingthetimeaveragingequivalentcircuitapproachofperiodicallyswitchinglinearnetworks.TheDCsteadystateandACsmallsignalcharacteristicsoftheconverterarealsogiven.
简介:BasedontheanalysisofDCcharacteristicsofsiliconbipolartransistorsatlowtemperature,DCanalyticmodelsofECLcircuitatlowtemperaturearederived,thencomparedwiththeexperimentaldataandcomputersimulationresults.ThemodificationofSPICEBJTmodelabouttemperatureanddesignoflowtemperatureECLcircuitarediscussed.
简介:Inordertorealizethemodulardesignofthemicrogrid,thispaperproposedanewmodulartopologyfortheAC-DCmixedmicrogrid.Inthattopology,theACmicrogridunitandtheDCmicrogridunitwerepackagedtogetherbytheback-to-backconverter.Thebattery-supercapacitorhybridenergystoragesystemwasconnectedtotheDCbusofback-to-backconverter.Bythereasonabledesignonthebattery-supercapacitorhybridsystem,theenergystoragesystemcouldsupplytherapidpowerandenergysupportforthemicrogridspontaneously.Themathematicalmodelandthecontrolalgorithmofthatmicrogridtopologywerestudied.Bythesimulationanalysis,itcanbeconcludedthatAC-DCmixedmodularmicrogridtopologycouldoperatesteadilyonboththegrid-connectedmodeandtheisolatedmode.Furthermore,wecanconcludebythesimulationthatthedesignedmodularmicrogridcouldoperateuninterruptedwhenthemicrogridtopologyswitchedfromthegrid-connectedmodetotheisolatedmode.Theseamlessswitchingbecamethenaturalpropertyforthemodularmicrogrid.Asaresult,themodularmicrogridtopologycanbeconsideredasausualpower/loadmoduletorealizethefriendlypowerinteractionwiththepowergrid.
简介:In_2O_3∶SnO_2(ITO)thinfilmswerefabricatedonthesubstrateofflexiblepolyethyleneterephthalate(PET)byDCmagnetronsputteringfromaceramictargetofIn_2O_3/SnO_2(90∶10).PropertiesofthethinfilmswerecharacterizedbyX-raydiffraction(XRD),four-pointprobe,Hall-effectmeasurement,UV-Visspectrophotometer,andscanningelectronmicroscopy(SEM).Theeffectsofsputteringpressure,oxygenpartialpressureanddepositiontemperatureonpropertiesofmicrostructureandoptoelectronicspropertiesofPET/ITOthinfilmswereinvestigatedindetail.High-qualityITOthinfilmsonPETsubstrateswiththeresistivityaslowas8.5×10-4Ω·cmandtheopticaltransmittanceover80%inthevisiblespectrumrangewereobtained.
简介:WeproposeaBPNNbasedadaptiveslidingmodecontrolschemeforspeedtrackingofaDCmotorwithunknownsystemnonlinearities.Theinput-outputlinearizationtechniqueisusedtocancelthenonlinearities,andoutputoftheBPNNisincorporatedintothecontrollerintheproposedscheme.ItisshownthattherotorspeedofaDCmotorcanfollowanyarbitrarilyselectedtrajectoriesundervariableloadtorque.Thentheapplicationoftheapproachistestedviacomesimulations.
简介:Inthispaper,wedemonstratetheacetylehe(C2H2)sensorwithhighsensitivityusingahollow-corephotonicbandgapfiber(HC-PCF).ExperimentsformeasuringC2H2concentrationsingasmixtureareperformed.Usinga2m-longHC-PCFasgascell,thespectrumofacetyleneatn1+n3bandhasbeenmeasured,andtheP11-branchhasbeenselectedforthepurposeofsensing.Aminimumdetectivityof143partspermillionbyvolume(ppmv)forthesystemconfigurationisestimated.
简介:Soft-switchingtechniquesareattractivetounity-power-factorAC/DCconverterintheviewofthesizereductionandEMIsuppression.Asoft-switchedboostPFCconverterhasbeenstudiedbasedonitstopologyanalysis,PSIMsimulationandcircuitexperiment.Aspeciallimitationofsoft-switchingtechniqueshasbeenfoundintheirAC/DCapplications.