Saber仿真开关电源设计.pdf

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1、®PowerConverterDesignUsingtheSaberSimulatorAStep-By-StepGuidetotheDesignofaTwo-Switch,Voltage-Mode,ForwardConverterUsingtheSaberSimulatorBySteveChwirkaAnalogy,Inc.Beaverton,Oregon(503)626-9700Page1of32®TableofContent1.0ScopeofDocument32.0Specifications32.1InputSpecifications32.2

2、OutputSpecifications32.3OtherSpecifications33.0Step-By-StepDesignProcess43.1OpenLoopDesign43.1.1DefinetheDutyCycleandTurnsRatiooftheTransformer43.1.2DesigntheRectifierandFilterCapacitor(OptionalSection)5ValidatetheRectifierandFilterCapacitorusingSaber93.1.3OutputFilterDesign10In

3、ductorDesign10CapacitorDesign113.1.4ValidatetheOpenLoopDesignusingSaber113.2CompensatorDesignusinganAveragedModel153.2.1ValidatetheAveragedModelusingSaber163.2.2Open-LoopACAnalysis183.2.3DesigningtheCompensationCircuit183.2.4ValidatetheCompensatorDesignusingSaber213.2.5Validatet

4、heClosedLoopParametersusingSaber213.3ModulatorDesignandFinalClosedLoopSimulation233.3.1ValidatetheModulatorDesignusingSaber253.3.2ValidatetheClosedLoopDesignusingSaber273.4FinalComponentLevelDesign29Page2of32®1.0ScopeofDocumentThisengineeringdocumentwillguidethereaderthroughthes

5、tep-by-stepdesignofatwoswitch,voltagemode,forwardpowerconverterusingtheSaberSimulator.Intheprocess,wewilldescribetypicaldesignconsiderationsandproblemsandhowtoovercomethem.ValidationofeachstepinthedesignprocesswillbeperformedusingSaber.2.0SpecificationsThefollowingspecifications

6、willbeusedtodesignthepowerconverter.2.1InputSpecificationsLineInput150Vdc,±6VPin(max)=Pout(max)=30/.8535WattsEff2.2OutputSpecificationsVout15VdcVout(ripple)£25mVp-pIout50mAto2AIout(ripple)£100mAp-pPout(max)=(15V)(2A)30Watts2.3OtherSpecificationsEfficiency³85%SwitchingFrequency20

7、0KHz(derived)Page3of32®3.0Step-By-StepDesignProcessThissectiondetailsthestepsnecessarytodesignthepowerconverter.3.1OpenLoopDesign3.1.1DefinetheDutyCycleandTurnsRatiooftheTransformerThebasicrelationshipinaforwardconverterisVout@(Vin)(1/n)(D)whereVout=dcoutputvoltagen=turnsratio=n

8、p/nsD=dutycycleGiventhatVout=15VDCandVin=150VDC