switching power supply

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1、SwitchingPowerSupplyByTonyLinHsin-ChengYaoECE445,SENIORDESIGNPROJECTFALL2004TA:ChadCarlson12/05/2004ProjectNo.22ABSTRACTSwitchingpowersupplyhasitsdominantroleintheeraofeveradvancingtechnology.Powerisneededineveryelectronicdeviceandswitchingpowersupplyisacrucialcomponentinmanyelectronicdev

2、icessuchascomputeranditsperipherals.Switchingpowersupplyhastheadvantageinitssmallsize,lightweight,highefficiency,andthecapabilityoftakingawiderangevoltageinput.Aspeoplebecameawareofenergyissues,efficiencyofelectronicdevicesbecomesapriorityforengineers.Thisswitchingpowersupplysystemisdesig

3、nedtooutputaiiiregulatedDCvoltageof12VforanACinputvoltagebetween90Vto130V.Thedevicehasamaximumoutputloadof2A,whichisatotalof24Wwithapproximately80%efficiency.TABLEOFCONTENTS1.INTRODUCTION11.1BenefitsandAdvantages11.2Specifications11.3Subprojects21.3.1ACInput21.3.2RectifierandFilter21.3.3D

4、C-DCConverter21.3.4FeedbackandPulseWidthModulator21.3.5DCLoad32.DESIGNPROCEDURE42.1DesignDecisions4iii2.1.1Rectifier42.1.2CoreMaterial42.1.3CoreGeometry42.1.4PrimaryCircuitSwitch42.2ToolsUsed53.DESIGNDETAILS63.1Schematics63.2Components63.2.1InputFilter63.2.2Transformer73.2.3OutputFilter73

5、.2.4OpticalCouplerCircuits83.2.5PWMCircuits94.DESIGNVERIFICATION114.1Testing114.1.1RectifierandFilter114.1.2DutyRatioAdjustments114.1.3OutputVoltageRegulation124.1.4Efficiency124.2Conclusions135.COST155.1Parts155.2Labor155.3TotalCost156.CONCLUSIONS16APPENDIXA1–TransformerInductancesA1APPE

6、NDIXA2–DutyMeasurementsA2REFERENCES18iii1.INTRODUCTIONSwitchingpowersupplyplaysanimportantroleastechnologyinelectronicdevicesrapidlyadvances.Inadditiontoitsapplicationincomputerpowersupply,itisalsoappliedinmonitors,medicalequipments,stereosystems,communicationsystems,andaerospaceapplicati

7、onswheregoodefficiency,lightweightandsmallsizewhereofprimeconcern.1.1BenefitsandAdvantagesAstherecentadvancesinsemiconductordevicesandcontrolcircuits,switchingpowersupplyproductionhasincreasedtremendously.Themassproductionofswitchingpowersupplieshasnotonlyincreasedi