Switching Power Supply Design, Second Edition

《Switching Power Supply Design, Second Edition》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、Source:SwitchingPowerSupplyDesignPart1TopologiesDownloadedfromDigitalEngineeringLibrary@McGraw-Hill(www.digitalengineeringlibrary.com)Copyright©2004TheMcGraw-HillCompanies.Allrightsreserved.AnyuseissubjecttotheTermsofUseasgivenatthewebsite.TopologiesDownloadedfromDigitalEngineeringLibrary@McGra

2、w-Hill(www.digitalengineeringlibrary.com)Copyright©2004TheMcGraw-HillCompanies.Allrightsreserved.AnyuseissubjecttotheTermsofUseasgivenatthewebsite.Source:SwitchingPowerSupplyDesignChapter1FundamentalSwitchingRegulators—Buck,Boost,andInverterTopologies1.1IntroductionThereareabout14basictopologie

3、s(basicblockdiagrams)commonlyusedtoimplementaswitchingpowersupply.Eachtopologyhasuniquepropertieswhichmakeitbestsuitedforcertainapplications.SomearebestusedforAC/DCoff-lineconvertersatlow(<200W)outputpower,someathigheroutputpower.SomeareabetterchoiceforhighACinputvoltages(
220VAC);somearebetter

4、foranACinputof120Vorless.SomehaveadvantagesforhigherDCoutputvoltages(>~200V)orinapplicationswheretherearemorethanfourorfivedifferentoutputvoltages.Somehavealowerpartscountthandoothersforthesameoutputpowerorofferabettertradeoffinpartscountversusreliability.Lesserinputoroutputrippleandnoiseisafre

5、quentfactorinatopologyselection.Similarly,sometopologiesarebetterusedforDC/DCconverters—againwithhighandlowoutputpower,highorlowoutputvoltages,andminimumpartscountassignificantselectioncriteria.Further,sometopologieshaveinherentdesigndrawbackswhichrequireadditionalcircuitryormorecomplexcircuitr

6、y,notcompletelyanalyzableinvariousworst-casesituations.Thustomakethebestchoiceofatopology,itisessentialtobefamiliarwiththemerits,drawbacks,andareasofusageofalltopologies.Apoorchoiceofatopologycandoomanewpowersupplydesignattheveryoutset.Inthischapter,theschematicsofthefundamentalandearliesttopol

7、ogies—thebuck,boost,andpolarityinverter—aredescribed.Theirbasicoperationisdescribed;criticalwaveformsareshownand3DownloadedfromDigitalEngineeringLibrary@McGraw-Hill(www.digitalengineeringlibrary.com)Copyright©2004TheMcGraw-HillCom