稳压电源中英文翻译.docx

稳压电源中英文翻译.docx

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稳压电源中英文翻译

山东理工大学

毕业设计

（外文翻译材料）

学院：

电气与电子工程学院

专业：

09电气双学位

*******

******

NCswitchingpowersupply

Abstract

Thissystembasedon51SCMcontrolunit,usedforLM2576-wildnumericalcontrolaswitchingpowersupplyoffuzzydigitalcontroltechnology,adjustloadR1,R2proportiontochangeoccupiesemptiescomparedtomaketheoutputstability,andcanbethroughthebuttons,digitaldisplaytorealizeoutputvoltagenumericalcontrol.Inaddition,thesystemtoinputpressure,flow,inputoutputflow,switchtubeoverheataswellastheprotectioncircuit,ensurethatthesystemisstableandreliable.

Keywords:

thenumericalcontrolswitchpowersupply，LM2576-wild，microcontroller

CONTENTS

Thefirstchapterdesigntask

1.Basicrequirements

2.Playapart

Thesecondchapteroverallschemecomparisonandcompared

Inthethirdchapterofthesystemhardwaredesign

（a）Thedesignofthewholesystem

1.Thesystemdesignthought

2.Theblockdiagramofthewholesystem

（b）Unitcircuitfunctionandtheanalysisoftheoperation

1.MinimumAT89S52SCMsystem

2.Rectifiercircuit

3.Thepowercircuit

4.LM2576-ADJvoltagecircuit

5.Thewholewaveoutputrectifiercircuitparametersarecalculated

6.Over-voltageprotection

Thefourthchaptersystemsoftwaredesign

1.Theflowchartofthewholesystem

Chapter5systemcommissioning

1.Thesoftwaredebugging

2.Hardwaredebugging

3.Themachinecommissioning

Chapter6systemtests

1.Thetestprojectcircuit

2.Testinginstruments

3.Testresults

Thefirstchaptertasksandrequirements

（a）Thetask

Designandconstructionofaswitchingpowersupply,itsstructurediagramshownasshowninfigure1

（b）Requirements

1,basicrequirements

（1）Basicspecifications:

inputvoltage:

+10V/DC（fluctuatingrange8to12V）

Outputvoltage:

+2.5V/DC~+6.5V/DC

（2）Thebasictechnicalindex:

Theoutputofsubsectionpowershift,and8from+2.5Vto6.5V+,andevery0.5Vincrease.Namely（2.5,3,3.5,4,4.5,5,5.5,6）

Efficiency:

70%（p<+2.5V/DC,1Atestingaccurate）

Maximumoutputcurrent:

2A;Voltageadjustmentrate:

2%orless;Currentadjustrate:

2%orless

（3）Canbearbitrarytunedtotherequirementsoftheoutputvoltage,andwithacertainwayofthedisplay.

（4）canbearbitrarythroughthekeyboardcontrolopen/closetheoutputvoltage.

2.Playapart

（1）Haveover-voltageprotection,inputvoltageprotectionmovement,thereare15Vovercurrentprotection,morethan3Aoutputcurrentprotectionmovement

（2）Improveefficiency:

80%（p

（3）Theripple:

1%orless（+2.5V/DC,2A20MHzoscilloscopetestingaccurate）

（4）Pressfromlowtohighorfromhightoloworderautomaticallychangetheoutputvoltage,eachfile2~3seconds,betweentimeandspaceinthetest.

Thesecondchapterschemecomparisonandselection

Plan1:

thedivisioncomponents,suchasSelf-excitationswitchingpowersupply,thecircuitprinciplediagramisasfollows:

TheinputvoltageforAC220v,50Hzacalternatingcurrent,afterfiltering,againbyrectifierbridgeafterrectifyingintoadc,throughthecontrolcircuitswitchtubeconductionandglobemakehighfrequencytransformerofalowvoltagemeasurementproducehigh-frequencyvoltage,smallpowerbyhigh-frequencytransformercouplingtosecondtest,thenthroughrectifierfilter,getdcvoltageoutput.Inordertomaketheoutputvoltagestability,withtheTL431samplingerror,theopticalcouplingamplifier,throughthePWMtocontrolswitchtubeconductionanddeadline（i.e.occupiesemptiescompared）,makestheoutputvoltageremainstable.

Fromtheforegoing,thisschemecircuitismorecomplex,difficult,sodon'tdebuggingfeasible.

Plan2：

DC-DCtransformtheBUCKtypewithA/Dconverter,andconstantlytestingpoweroutputvoltage,dependingonthepowersupplyoutputvoltageandofthedifferenceofthesetvalue,useofPWMmodulePWMwavesinoutput,directcontrolofthepowersupply.ARMextendedbuttons,digitaldisplaytorealizethenumericalcontroloutputvoltage.

Thisschemeissimple,butallthecircuitbydivisioncomponents,interference;AndPWMmodulesingle-chipmicrocomputercontrolprogramiscomplicated,consider52andA/Dprogrambetweenfactors,willcausetheoutputofthePWMdelay,distortion,sothattheoutputvoltageisnotquitestable,andsoon.

Plan3:

thespecialchippowerLM2576-suchaswild,itstypicalcircuitareasfollows:

LM2576seriesofstabilizerwhicharemonolithicintegratedcircuit,canprovidethebuckswitchingvoltageregulators（buck）allsortsoffunctions,candrive3Aload,haveexcellentlinearandloadadjustmentability,andLM2576stabilizerinteriorcontainsfrequencycompensationdeviceandAfixedfrequencyasits,thenumberoftheexternalcomponentscanbeminimized,andeasytouse.

Thisscheme,220V/50HzacvoltageafterrectifyingcircuitandDC/DCvoltagechipLM2576wildtransformationforstable-DCvoltage,andthenthroughtheadjustmentoftherelationshipofscaleandR2R1toadjustLM2576chipoftheinputoutputvoltagestabilitythanempty.Anexternalcircuitcomponentsnumberless,andtheprogramissimple,andtheoutputvoltagestabilityisgood.

Throughvariousprogram,feasibility,complexity,systemindexcomparativeadvantagesanddisadvantagesofeachscheme,comprehensive,weusethethirdplan.

Inthethirdchapterofthesystemhardwaredesign

（a）Thedesignofthewholesystem

1.Thedesignthought

SystemtomonolithicintegratedcircuitAT89S52,LM2576-forthecorepart,andthewildthroughthemonolithicintegratedcircuittooutputvoltagegather,comparison,operations,andtheoutputvoltagecontrol,automaticregulationsystemstructurediagramshownasshowninfigure1.

220V/50HzacvoltageafterrectifyingcircuitandDC/DCvoltagechipLM2576wildtransformationforstable-5~12VDCvoltageoutput,theoutputvoltagethroughsamplingcircuitbysampling,A/DconversionchipADC0804afterconvertingto52afterprocessing,controlsimulationelectronswitchtochoose4051respectivelytheninepotentiometerR2,changeR1andR2ratiovalues,whichchangeLM2576-ofthewildchipPWMpulseofempty,MOStubesworkthantoswitchstatein,theinputof15VDCvoltage"chopped"fortheandofthesamefrequencyPWMwavespulsewave,pulsewavethroughtherectifierfiltercircuitoutputfor5~12VDCvoltage.

Becauseofthisthetopicrequesthavenineoutputsteppingdemand,socantuneinadvanceeachvoltageresistance,throughthecorrespondingkeychoiceoutputvoltage,directlytotheanalogswitch4067chooseresistance,theycangettooutputvoltage.

Atthesametime,todetectthevoltage,currentvaluethroughthedisplayLCD1062real-timedisplay.Ifworkingcurrentistoobig,theflowdetectioncircuitwillbesenttothetestingresultsofsingle-chipmicrocomputer,SCMcontrolrelaythroughtheacbranchrealizeover-currentprotectionsysteminfault,aftertheoperationissetbytheresetbuttontomaycausethesystemtoresumenormalwork.

2.Theblockdiagramofthewholesystem

（b）Unitcircuitfunctionandtheanalysisoftheoperation

1.MinimumAT89S52SCMsystem

Minimumsystemincludingcrystaloscillatorcircuitandresetswitchandpowersupplyparts.Figure2fortheminimumAT89S52SCMsystem.

2.Rectifiercircuit.

Thewaverectifiercircuitismadeupoftwohalfwaveofrectifiercircuit.Becauseinthenexttwo,addonmiensinputvoltageoftheoppositepolarity,therefore,toadynamicbalance,ineverysignalcycle,theC1andC2experience2timescharger,dischargeprocess,currentwillappeartwocurrentpulsewithpolarity.SoinadditiontotheVosawtoothwaveonthewavyfrequency,improvetheabilityofdoublefiltering,thusreduceripplevoltage.

3.Powersupplycircuit

Thedcpowerbypowersupply,filtering,protection,suchasvoltage,fourbasicmodules.

（1）ThepowertransformerUSESastep-downtransformer,thepowergridvoltage220Vtransformintoneedacvoltage.Theacvoltage

Afterrectifying,mayobtainelectronicequipmentneeddcvoltage.

（2）Userectifiercircuitbridgerectifiercircuitsingle-phase,50Hzacalternatingcurrenttransformationfordirectioninvariablebutstillhasthepulsesizestraight

Flowelectricity.Itsadvantageishighvoltageripplevoltage,small,theutilizationrateoftransformerhigh.ThisdesignbyAbridgepileofbridgerectifier,RS808domaximumcurrentcanreach8A,cooperatewiththedesignofthelargefiltercapacitance,sothepoweroftheinstantaneouslargecurrentpowersupplycharacteristics,lownoise,goodreactionspeed,outputripplesmall.

（3）Filtercircuitusingcapacitancefiltercircuit,willthepulsationoftherectifiercircuitoutputfilter,getmostofthecomponentsissmoothdctheelectricity.Thiscircuitadopts4700uF/50VlargecapacitanceC3,C4tomaketheoutputvoltagemoresmooth,thepowersupplycharacteristicsmoment,suitablefortaketheperceptualload,suchasmotorstart-up.C3,C4everyparallelconnectiona0.1uF/63VCBBcapacitance,filtertohighfrequencyinterference,makeinputtointegratedcircuitsL11,L12ofdcasfaraspossiblethesmoothandpure.

（4）ByLM317outputvoltagecircuitispower,LM337outputnegativesupply.LM317andLM337areusedinternalheatLoad,containsovercurrentprotection,hotoffandsafetyworkingareaforperfectprotectioncircuit,thatpowercansavethefuse,andsoeasylossdevice.Regulatingcircuit:

tomeettheneedsofthedifferentapplicationsituationandthevoltageissettocanbeadjusted.ThecalculationoftheoutputvoltageVo=1.25x（1+Rf/R）,adjustableresistanceinuse