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1、SwitchModePowerSupplyBasicsTutorial-summaryortutorialaboutthebasicsofswitchmodepowersupplies,theirdesign,operationandadvantagesanddisadvantages.SMPSTUTORIALINCLUDES·Switchmodepowersupply·Switchmoderegulatorfundamentals·Stepdown'Buck'converter·Stepup'Boost'converter·B
2、uck-BoostconverterSwitchmodepowersuppliesarewidelyusedbecauseoftheadvantagestheyofferintermsofsize,weight,cost,efficiencyandoverallperformance.Asaresultoftheirperformance,switchmodepowersuppliesareusedinallbutthemostexactingapplicationstoprovideanefficientandeffectiv
3、esourceofpowerformostformsofelectronicsystems.Switchmodepowersupplieshavebecomeanacceptedpartoftheelectronicssceneandareoftenreferredtoasswitchmodepowerconverters,orjustswitchers.SwitchmodepowersupplyterminologySwitchmodepowersupply,SMPS,technologymaybereferredtobyan
4、umberofsimilarterms.Whiletheyalllookatthesamebasictechnology,theyrefertodifferentelementsoftheoveralltechnology:·Switchmodepowersupply,SMPS: Thetermswitchmodepowersupplyisgenerallyusedtoindicateanitemthatcanbeconnectedtothemains,orotherexternalsupplyandusedtogenerat
5、ethesourcepower.Inotherwordsitisacompletepowersupply.·Switchmoderegulator: Thistypicallyrefersjusttotheelectroniccircuitthatprovidestheregulation.Aswitchmoderegulatorwillbepartoftheoverallswitchmodepowersupply.·Switchmoderegulatorcontroller: Manyswitchmoderegulator
6、integratedcircuitsdonotcontainheseriesswitchingelement.Thiswillbetrueifthecurrentorvoltagelevelsarehigh,becauseanexternalseriesswitchingelementwouldbeabletobetterhandlethehighercurrentandvoltagelevels,aswellastheresultantpowerdissipation.SwitchmodepowersupplybasicsTh
7、ebasicconceptbehindaswitchmodepowersupplyorSMPSisthefactthattheregulationisundertakenbyusingaswitchingregulator.Thisusesaseriesswitchingelementthatturnsthecurrentsupplytoasmoothingcapacitoronanoff.SwitchingregulatorconceptusedinswitchmodepowersupplyThetimetheseriesel
8、ementisturnedoniscontrolledbythevoltageonthecapacitor.Ifitishigherthanrequired,theseriesswitchingelementisturnedoff,ifitislowerthan
