一种反激式恒压恒流输出ac2fdc开关电源芯片的设计

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1、万方数据AbstractThispaperissupportedbytheresearchprojectof“Theoreticalresearchand designofkeytechniquesforAC/DCconvertorwithBCDprocess”fromCADinstitue ofXidianUniversity.Basedontheprinciplesofswitchingpowersupply,aCV/CC outputflybackAC/DCswitchingpowersupplychipisdesignedinthispaper

2、. Theoperationprinciplesandmodesofflybackconverterareintroducedindetail. Basedontheresearchofelectromagneticinductiontheory,thetransformerusedin AC/DCconvertersisdesigned.Basedontheanalysisabove,thesystemdesignand circuitsimulationhavebeencompleted.Asoft-startcircuitisdesignedin

3、thechipto preventtherushcurrentandtheovershootoftheoutputvoltagefromdamagingthe powersystem,thesoft-startcircuitenhancesthesafetyandreliabilityofthesystem greatly.ThechiphasacapabilityofCV/CCoutput,itcanreducethechargetimewhen usedinlithiumbatterychargingapparatus.Whenthechipwor

4、ksintheCCmode,PFM modecontrolsthesystem,whenthechipworkintheCVmode,PWMmodecontrols thesystem.Thechipcanprovideflexiblesolutionsfordifferentloads.Theloadcurrent caninfluencetheoutputvoltage,inordertosolvethisproblem,acablevoltagedrop compensationcircuitisproposedtomakesurethesyst

5、emcanstabilizetheoutput voltageevenwhentheloadcurrentchangesalot.Thecircuitenhancestheload regulationandCVprecisiongreatly.EMIperformancecanalsobeoptimizedbyits frequencyjitteringfunction.Thewholechipisdesignedbasedonthe1.0µm40VBCDprocess.Thesimulation andtheverificationarecompl

6、etedbyHspice.Thesimulationresultsshowthatthechip hasagoodperformanceofCV/CCoutput,thefunctionandtheperformanceofthe wholecircuitmeetalltherequirements.Keywords:FlybackCV/CCCableVoltageDropCompensationFrequencyJittering万方数据万方数据目录第一章绪论..............................................

7、.....................................................................1 1.1课题背景及研究意义.............................................................................................1 1.2开关电源的发展及趋势........................................................................................

8、.2 1.3本论文的主要研究工作和章节安排..........................