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1、MagneticsDesignforSwitchingPowerSuppliesLloydH.DixonSection1IntroductionExperiencedSwitchModePowerSupplydesign-ersknowthatSMPSsuccessorfailuredependsheav-ilyontheproperdesignandimplementationofthemagneticcomponents.Parasiticelementsinherentinhighfrequencytransformersorinductorscauseava-rietyof
2、circuitproblemsincluding:highlosses,highvoltagespikesnecessitatingsnubbersorclamps,poorcrossregulationbetweenmultipleoutputs,noisecou-plingtoinputoroutput,restricteddutycyclerange,Figure1-1TransformerEquivalentCircuitetc.FigureIrepresentsasimplifiedequivalentcircuitofatwo-outputforwardconverte
3、rpowertransformer,optimizeddesign,(3)Collaborateeffectivelywithshowingleakageinductances,corecharacteristicsexpertsinmagneticsdesign,andpossibly(4)Becomeincludingmutualinductance,dchysteresisandsatu-a"magneticsexpert"inhisownright.ration,coreeddycurrentlossresistance,andwindingObstaclestolearn
4、ingmagneticsdesigndistributedcapacitance,allofwhichaffectSMPSInadditiontothelackofinstructioninpracticalperformance.magneticsmentionedabove,thereareseveralotherWithrareexception,schoolsofengineeringpro-problemsthatmakeitdifficultfortheSMPSdesignervideverylittleinstructioninpracticalmagneticsre
5、le-tofeel"athome"inthemagneticsrealm:vanttoswitchingpowersupplyapplications.Asa.Archaicconceptsandpractices.Ourgreat-result,magneticcomponentdesignisusuallydele-grandparentsprobablyhadabetterunderstandinggatedtoaself-taughtexpertinthis"blackart".Thereofpracticalmagneticsthanwedotoday.Unfor-are
6、manyaspectsinthedesignofpractical,manu-tunately,inanerawhencomputationwasdiffi-facturable,lowcostmagneticdevicesthatunques-cult,ourancestorsdevelopedconceptsintendedtionablybenefitfromyearsofexperienceinthisfield.tominimizecomputation(suchas"circularHowever,themagneticsexpertisunlikelytobesuff
7、i-mils")andothershortcuts,stillinuse,whichcientlyawareoftheSMPScircuitproblemscausedmakethesubjectofmagneticsmorecomplexandbythevariousparasiticelementsandtheimpactofconfusingtoustoday.Ancientdesignequationsthespecificcircuitlocationsof
