外文翻译开关电源半桥和全桥变换器拓扑(适用于毕业论文外文翻译

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1、w《功率因数校正开关电源的研究与设计》外文翻译SwitchingPowerSupplyDesign开关电源设ilCHAPTER3Half-andFull-BridgeConverterTopologies3.1IntroductionHalf-bridgeandfull-bridgetopologiesstresstheirtransistorstoavoltageequaltotheDCinputvoltagenottotwicethisvalueasdothepush-pullsingle-endedandinterleavedfor

2、wardconvertertopologies.Thusthebridgetopologiesareusedmainlyinofflineconverterswheresupplyvoltagewouldbemorethantheswitchingtransistorscouldsafelytolerate.BridgetopologiesarealmostalwaysusedwherethenormalACinputvoltageis220Vorhigherandfrequentlyevenfor120-VACinputs.Anaddi

3、tionalvaluablefeatureofthebridgetopologiesisthatprimaryleakageinductancespikesFigures2.1and2」0areeasilyclampedtotheDCsupplybusandtheenergystoredintheleakageinductanceisreturnedtotheinputinsteadofhavingtobedissipatedinaresistivesnub-berelement.3.2Half-BridgeConverterTopolo

4、gy3.2.1BasicOperationHalf-bridgeconvertertopologyisshowninFigure3」.Itsmajorwadvantageisthatlikethedouble-endedforwardconverteritsubjectsthe“of厂transistortoonlyVdeandnottwicethatvalue.ThusitiswidelyusedinequipmentintendedfortheEuropeanmarketwheretheACinputvoltageis220V・Fir

5、stconsidertheinputrectifierandfilterinFigure3>1.Itisuseduniversallywhentheequipmentistoworkfromeither120・VACAmericanpoweror220-VACEuropeanpower.Thecircuitalwaysyieldsroughly320-VrectifiedDCvoltagewhethertheinputis120orFIGURE3.1Half-bridgeconverter.Oneendofthepowertransfor

6、merprimaryisconnectedtothewjunctionoffiltercapacitorsClC2viaasmallDClockingcapacitorCb.TheotherendisconnectedtothejunctionofQIQ2whichturn“on"and“off，onalternatehalfcycles.WithSIintheclosedpositionthecircuitisavoltagedoublerintheopenpositionitisafull-waverectifier.Ineither

7、casetherectifiedoutputisabout308to336Vde.220VAC.ItdoesthiswhenswitchS1issettotheopenpositionfor220-VACinputortotheclosedpositionfor120-VACinput.TheS1componentisnormallynotaswitchmoreoftenitisawirelinkthatiseitherinstalledfor120VACornotfor220VAC.Withtheswitchintheopen220-V

8、ACpositionthecircuitisafullwaverectifierwithfiltercapacitorsClandC2inseries.Itproducesapeakrecti