电气外文文献及翻译开关电源设计.docx

电气外文文献及翻译开关电源设计.docx

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电气外文文献及翻译开关电源设计

外文文献：

SwitchingPowerSupplyDesign

Switchingpowersupplyworkinhighfrequency,highpulsestate,areanalogcircuitsinaratherspecialkind.Clothboardstofollowtheprincipleofhigh-frequencycircuitwiring.

First,layout:

Pulsevoltageconnectionasshortaspossible,includinginputswitchconnectedtothetransformer,outputtransformertotherectifiertubecable.Pulsecurrentloopassmallaspossiblesuchastheinputfiltercapacitorisreturnedtothetransformertotheswitchcapacitornegative.Someout-endedoutputtransformersaretheoutputrectifiertotheoutputcapacitorbacktotransformercircuitXcapacitorascloseaspossibletotheinputswitchingpowersupply,inputlinesshouldbeavoidedinparallelwithothercircuits,shouldbeavoided.YcapacitorshouldbeplacedinthechassisgroundterminalorFGconnectors.Atotaloftouchinductionandtransformertomaintainacertaindistanceinordertoavoidmagneticcoupling.Suchaspoorhandlingoffeelinginbetweeninductorandtransformerplusashield,overanumberofEMCperformanceforpowersupplytothegreaterimpact.

Generaltheoutputcapacitorcanbeusedtheothertwoacloserectifieroutputterminalshouldbecloseto,canaffectthepowersupplyoutputrippleindex,twosmallcapacitorinparallelresultsshouldbebetterthanusingalargecapacitor.Heatingdevicestomaintainacertaindistance,andelectrolyticcapacitorstoextendmachinelife,electrolyticcapacitorsistheswitchingpowersupplybottlenecklife,suchastransformers,powercontrol,highpowerresistorsandelectrolytictomaintainthedistancerequiredbetweentheelectrolyteleavingspaceforheatdissipation,conditionspermitting,maybeplacedintheinlet.

Controlparttopayattentionto:

Weaksignalhighimpedancecircuitconnectedtosamplethefeedbackloopasshortasintheprocessingasfaraspossibleavoidinterference,thecurrentsamplingsignalcircuits,inparticularthecurrentcontrolcircuit,easytodealwithsomeunexpectedbadTheaccident,whichhadsomeskill,nowto3843thecircuitexampleshowninFigure

（1）Figure1betterthanYuFigure2,Figure2ZaifulltimebyobservingthecurrentwaveformoscilloscopeMingxiansuperimposedspikes,YouyuganraolimitedflowratiodesignZhiDianlow,Figure1thereisnosuchphenomenon,thereareswitchdrivesignalcircuit,switchresistanceshouldbeclosetotheswitchdrivercanswitchtheworktoimprovethereliabilityofthisandthehighDCimpedancevoltagepowerMOSFETdrivercharacteristics.

Second,routing

Alignmentofcurrentdensity:

nowthemajorityofelectroniccircuitboardusinginsulatedcopperconstitutetied.CommonPCBcopperthicknessof35μm,thealignmentvaluecanbeobtainedinaccordancewith1A/mmexperiencethevalueofcurrentdensity,thespecificcalculationscanbefoundintextbooks.Toensurethealignmentprinciplesofmechanicalstrengthshouldbegreaterthanorequaltothewidthof0.3mm（othernon-powersupplycircuitboardmaybesmallerminimumlinewidth）.PCBcopperthicknessof70μmisalsocommoninswitchingpowersupply,thenthecurrentdensitycanbehigher.

Addthat,nowChangyongcircuitboarddesigntooldesignsoftwaregenerallyitemssuchaslinewidth,linespacing,holesizeandsodryplateGuoJinXingparameterscanbeset.Inthedesignofcircuitboards,designsoftwareautomaticallyinaccordancewiththespecifications,cansavetime,reducesomeoftheworkloadandreducetheerrorrate.

Generallyhigheronthereliabilityoflinesorlinedensitywiringcanbeuseddoublepanel.Characterizedbymoderatecost,highreliability,tomeetmostapplications.

Theranksofsomeofthepowermoduleproductsarealsousedplywood,mainlytofacilitateintegrationofpowerdevicessuchastransformerinductancetooptimizewiring,coolingandotherpowertube.Goodconsistencywiththecraftbeautiful,transformercoolinggoodadvantage,butitsdisadvantageishighcost,poorflexibility,onlysuitableforindustrialmassproduction.

Single-sided,themarketcirculationofalmostuniversalswitchingpowersupplyusingsingle-sidedcircuitboard,whichhastheadvantageoflowercostsinthedesignandproductiontechnologyarealsotakensomemeasurestoensureitsperformance.

SinglePCBdesigntodaytotalkaboutsomeexperience,asasinglepanelwithlowcost,easy-to-manufacturefeatures,theswitchingpowersupplycircuithasbeenwidelyused,becauseofitssidetiedonlycopper,thedevice'selectricalconnections,mechanicalfixationshouldrelyonthecopperlayer,theprocessingmustbecareful.

Toensuregoodperformanceofthemechanicalstructurewelding,single-sidedpadshouldbeslightlylargertoensurethatthecopperandsubstratetiedgoodfocus,andthuswillnotbeshockedwhenthecopperstrip,brokenoff.Generalweldingringwidthshouldbegreaterthan0.3mm.Paddiametershouldbeslightlylargerthanthediameterofthedevicepins,butnottoolarge,toensurepinandpadbythesolderconnectionbetweentheshortestdistance,plateholesizeshouldnothinderthenormalconditionsforthedegreeofinvestigation,thepaddiameterisgenerallygreaterthanpindiameter0.1-0.2mm.Multi-pindevicetoensureasmoothinvestigationdocumentscanalsobelarger.

Electricalconnectionshouldbeaswideaspossible,inprinciple,shouldbelargerthanthewidthofpaddiameter,specialcircumstancesshouldbeconnectedinlinewiththeneedtowidentheintersectionpad（commonlyknownasGenerationtears）,toavoidbreakingcertainconditions,lineandpad.Principleofminimumlinewidthshouldbegreaterthan0.5mm.

Single-boardcomponentstobeclosetothecircuitboard.Needoverheadcoolingdevicetodeviceandcircuitboardbetweenthepinspluscasing,canplayasupportingdeviceandincreasethedualroleofinsulationtominimizeoravoidexternalshocksonthepadandthepinjunctionimpactandenhancethefirmnessofwelding.Circuitboardsupportingtheweightoflargepartscanincreasetheconnectionpoint,canenhancejointstrengthbetweenthecircuitboard,suchastransformers,powerdeviceheatsink.

Single-sidedweldingpinswithoutaffectingthesurfaceandtheshellspacingofthepriorconditions,itcanbetostaylonger,theadvantageofincreasedstrengthofweldedparts,increaseweldareaandimmediatelyfoundaWeldphenomenon.Shearpinlonglegs,theweldingforcesmallerparts.InTaiwan,theJapaneseoftenusethedevicepinsintheweldingareaandthecircuitboardwasbent45degrees,andthenweldingprocess,itsreasoningIbid.Doublepaneltodaytotalkaboutthedesignofsomeoftheissues,inrelativelyhighnumberofrequests,ortakethelinedensityofthelargerapplicationenvironmentsusingdouble-sidedPCB,itsperformanceandvariousindicatorsofalotbetterthanasinglepanel.

Two-panelpadasholeshavebeenhighintensitymetalprocessing,weldingringsmallerthanasinglepanel,thepadholediameterslightlylargerindiameterthanpins,asintheweldingprocesssoldersolutionconducivetopenetratethroughthetopholesolderpadtoincreasetheweldingreliability.Butthereisadisadvantageiftheholeistoolarge,wavesolderingtinwhenthejetimpactinthelowerpartofthedevicemaygoup,havesomeflaws.

Highcurrenthandlingofalignment,linewidthinaccordancewithpre-quoteprocessing,suchasthewidthisnotenoughtogoonlineingeneralcanbeusedtoincreasethethicknessoftinplatingsolution,themethodhasagoodvarietyof

1.Willtakethelinesettopadproperty,sothatwhenthecircuitboardmanufacturingsolderalignmentwillnotbecovered,thewholehotairnormallybetinplated.

2.Inthewiringbyplacingpads,thepadissettotakeinlineshape,payattentiontothepadholessettozero.

3.Inthesolderlayerplacedonline,thismethodisthemostflexible,butnotallPCBmanufacturerswillunderstandyourintentions,neededcaptions.Placethelineinthesolderlayerofthesitewillnotcoatedsoldertinninglineseveralmethodsasabove,tonotethat,ifthealignmentofaverywideallplatedwithtininsolderafterthesolderwillbondalotanddistributionisveryuneven,affectingappearance.Articletincanbeusedgenerallyslenderwidthinthe1~1.5mm,lengthcanbedeterminedaccordingtolines,tinpartoftheinterval0.5~1mm

Double-sidedcircuitboardforthelayout,thealignmentprovidesaveryselective,makewiringmorereasonable.Ontheground,thepowergroundandsignalgroundmustbeseparated,thetwotoconvergeinfiltercapacitors,inordertoavoidalargepulsedcurrentthroughthesignalgroundconnectioninstabilitycausedbyunexpectedfactors,thesignalcontrolcircuitgroundingpointasfaraspossible,askill,asfaraspossiblethealignmentofthenon-groundedwiringlayerinthesameplace,thelastshopinanotherlayerofearth.Outputlinethroughthefiltercapacitors,thegeneralfirst,andthentotheload,inputlinemustalsopasscapacitor,tothetransformer,thetheoreticalbasisistoripplethroughtripfiltercapacitor.

Voltagefeedbacksampling,inordertoavoidhighcurrentthroughthealignmentofthefeedbackvoltageonthesamplingpointmustbethemostperipheralpoweroutputtoincreasetheloadeffectoftargetmachine.

Alignmentchangefromawiringlayertoanotherwiringlayergenerallyusedholeconnected,notthroughthepinpaddevicetoachieve,becausethepluginthedevicemaybedamagedwhentherelationshipbetweenthisconnection,thereiscurrentineverypassageof1A,atleasttwothrough-hole,throughholediameterisgreaterthantheprincipleof0.5mm,0.8mmgenerallyprocessedensurereliability.

Coolingdevices,in