Seite - 42 - in Emerging Technologies for Electric and Hybrid Vehicles

Energies 2017,10, 1217 Figure47.Bridgeless InterleavedBoostPFCConverter [46]. Williamson et al., presented some isolatedDC-DCconverter topologies in [44]. TheZVSFB ConverterwithCapacitiveOutputFilter (Figure48)canachievehighefficiencyas ituseszerovoltage switching(ZVS)alongwith thecapacitiveoutputfilterswhichreduces theringingofdioderectifiers. The trailingedgePWMfull-bridgesystemproposedin[107]. TheInterleavedZVSFBConverterwith VoltageDoubler (Figure49) further reduces thevoltage stress andripple currenton thecapacitive outputfilter, it reduces thecost too. Interleavingallowsequalpowerandthermal lossdistribution in eachcell. Thenumberof secondarydiodes is reducedsignificantlyby thevoltagedoubler rectifier at theoutput [34]. Among itsoperatingmodes,DCM(discontinuousconductionmode)andBCM (boundaryconductionmode)arepreferable. TheFullBridgeLLCResonantConverter (Figure50) is widelyusedin telecomindustry for thebenefits likehighefficiencyat resonant frequency. Butunlike the telecomsector,EVapplications requireawideoperating range. Reference [41] showsadesign procedure forsuchconfigurations for theseapplications. Figure48.ZVSFBConverterwithCapacitiveOutputFilter [46]. 42