LCC环路反馈设计.pdf

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1、ApplicationReportSLUA582A–October2010–RevisedNovember2010FeedbackLoopDesignofanLLCResonantPowerConverterHongHuang.........................................................................................Power-SupplyControlProductsABSTRACTThisapplicationnotedescribe

2、sanapproachtodesignfeedbackloopcompensationforanLLCresonanthalf-bridgepowerconverter.TheapproachdescribedhereisbasedonthemeasuredBodeplotsofthemodulatorgeneratedbyanetworkanalyzer.Asweknow,aslongasthemodulatorBodeplotsareobtained,thefrequencydomainpolesandzerosint

3、hefeedbackloopcompensationcanbeanalyticallydetermined,thenfine-tunedwithabenchtest.Thismeasurementisnecessaryaspartoffeedbackloopdesignbecauseapracticalsmall-signalmodelisnotavailableforLLCresonantconverters.ThisdocumentusestheTexasInstruments'UCC25600asthefrequen

4、cycontroller.AdetaileddescriptionoftheUCC25600anditsassociatedexampledesignfixture,theUCC25600EVM-341,canbefoundintheproductdatasheetandtheevaluationmoduleuser’sguide,respectively;bothadditionaldocumentsareavailablefordownloadatwww.ti.com.Contents1ControlLoopDescr

5、iptionofanLLCConverter.........................................................................22LoopCompensationDesignApproach...................................................................................43Methodology.........................................

6、........................................................................54References...................................................................................................................8ListofFigures1BlockDiagramofaTypicalLLCResonantHalf-BridgeConver

7、ter...................................................22AnotherWaytoDefineGm(w)andGc(w).................................................................................33InitialGm(w)Measurement.......................................................................

8、..........................64Re-MeasurementofGm(w).................................................................................................75Desi