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低纹波高效率DCDC开关电源设计与实现的中期报告.docx

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低纹波高效率DCDC开关电源设计与实现的中期报告 Introduction Inrecentyears,theefficiencyofpowerelectronicsconvertershasbecomeanimportantresearchtopicinthefieldofpowerelectronics.InordertoimprovetheconversionefficiencyofDCDCswitchpowersupplies,theproblemofhigh-frequencyswitchingnoiseoftenencounteredintraditionalDCDCswitchpowersuppliesneedstobesolved.Theuseoflow-rippleDCDCswitchpowersuppliescaneffectivelysuppresstheswitchingnoisegeneratedbythepowersupply,reduceelectromagneticinterference,andimprovetheconversionefficiencyofthepowersupply.Therefore,thisreportmainlyintroducestheprogressofthedesignandimplementationofalow-ripplehigh-efficiencyDCDCswitchingpowersupply. Progress 1.Determinethedesignschemeaccordingtotherequirements.Thedesignrequirementsofthepowersupplyare:theinputvoltageis24V,theoutputvoltageisadjustablebetween5Vand12V,theratedoutputpoweris10W,andtheripplecoefficientislessthan1%.Basedontheserequirements,adesignschemeisproposed,andthecircuittopologyisasynchronousbuckconverter. 2.Designthecircuitschematic.Accordingtotheselectedtopology,thecircuitschematicofthepowersupplyisdesignedusingsimulationsoftware,andthecircuitparametersarecalculated. 3.Selectcomponents.Basedonthecalculatedcircuitparametersandtherequirementsofthecomponents,thecomponentsareselectedforthepowersupply,includingMOSFETs,inductors,capacitors,anddiodes. 4.Circuitsimulation.Thedesignedcircuitschematicisimportedintosimulationsoftwaretosimulatetheperformanceofthepowersupply.Thesimulationresultsshowthatthepowersupplymeetsthedesignrequirements,andtheoutputripplecoefficientislessthan1%. 5.PCBlayout.ThecircuitschematicisimportedintoPCBsoftwareforPCBlayout.Accordingtothelayoutconsiderationsanddesignspecifications,theplacementofcomponentsandtheroutingofthecircuitarecompleted. 6.Componentassembly.AfterthePCBismanufactured,thecomponentsareassembledonthePCBaccordingtothelayout.TheassemblyprocessincludesSMT,DIP,andsoldering. 7.Powersupplytest.Afterthecomponentassemblyiscompleted,thepowersupplyistested.Thetestresultsshowthatthepower