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页数:6页
时间:2019-02-19
《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》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
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
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