EMC讲座资料

电力电子装置电磁干扰的形成、预测及抑制技术EMIemissionmechanism，predictionanditscontroltechniquesinpowerelectronicsequipment30Oct30Oct,200,20077报告人:和军平[e-mail]哈工大三：电子装置的辐射干扰发射电子装置的辐射发射基本原理电子装置辐射的预测辐射干扰的抑制技术一：研究者简介二：电力电子装置的传导电磁干扰发射电力电子装置传导干扰发射基本原理电力电子装置传导干扰的预测电力电子装置传导干扰抑制技术EMI诊断技术30,Nov,200730,Nov,2007，，JunpingJunpingHeHe四：总结哈尔滨工业大学深圳研究生院（电力电子与电力传动研究中心）[e-mail]教育经历：2003年—2005年博士后（电气工程），清华大学、台达DPEC1999年—2003年获博士学位(电气工程),清华大学研究方向：电力电子与电传动，电磁兼容，计算机自动测控技术研究专长:电力电子电磁兼容技术30,Nov,200730,Nov,2007，，JunpingJunpingHeHe主要EMC科研项目:1)台达公司企业资助项目：开关电源磁元件杂散电磁场及其对电磁干扰的作用，2003-2005，优秀完成2)国家自然基金资助项目：典型电力电子装置电磁干扰特性的研究，1999-2002，完成3）在IEEE-APEC,PESC,EMC，电机工程学报，电工技术学报发表发表论文多篇EMC工作实验室30,Nov,200730,Nov,2007，，JunpingJunpingHeHe实验室的LISN实验室的ＥＭＩ接收机近场探头30,Nov,200730,Nov,2007，，JunpingJunpingHeHe二：电力电子装置的传导电磁干扰发射(150kHz-30MHz)2.1电力电子装置传导干扰发射基本原理2.1.1：测试布局和检测量30,Nov,200730,Nov,2007，，JunpingJunpingHeHeLN单相：L，NlineEMI接收机测量上述线上的射频干扰量值，均要小于限值30,Nov,200730,Nov,2007，，JunpingJunpingHeHe三相：L1，L2，L3，EMI接收机测量上述线上的射频干扰量值，均要小于限值30,Nov,200730,Nov,2007，，JunpingJunpingHeHe2.1.2电力电子装置电磁干扰的产生源头和传播机理ThreefactorsofEMI!EMIsource,couplingpaths,sensitiveobjective电磁干扰产生的源头Therearelotsofdifferentopinions.Mosfet,Diode,transformer,ACloopetcStrictlyspeaking,OnlyNonlinearswitchingdevicesaretrueEMIsourcesforEMIemission!Othersarecouplingpaths!OnlyforRadiationemissionorsimplyanalysis,otherstransformerandACloopcanbetreatedasEMIsource!SensitiveobjectiveEMIsource30,Nov,200730,Nov,2007，，JunpingJunpingHeHeuDUDMuD0uDRIDMiDttdiD/dttfrr(a)(b)二极管开通特性IRM(b)uDURMuD0uDRIFiDttdiF/dttrr(a)Q1Q2dirr/dtirrt0t2t1二极管的反向恢复过程（硬恢复）A:A:DiodeturnDiodeturn--onandturnonandturn--offoff30,Nov,200730,Nov,2007，，JunpingJunpingHeHe•Voltagespike•HighFrequencyRinging(EMI)Current,IswVoltage,VswDiodeReverseRecoveryTurn-onTurn-offB:B:TransistorturnTransistorturn--onandturnonandturn--offoff30,Nov,200730,Nov,2007，，JunpingJunpingHeHeHowaboutcouplingpaths!Thedifficultfactors!BasicEMIcouplingmechanismA:AlongmetalLead30,Nov,200730,Nov,2007，，JunpingJunpingHeHeB:spaceInducteffectB1:Capacitivecouplingeffect:Thereisacouplingcapacitorbetweenevery-twoconductors!DSSkC2112=PS1C2C3C4CTraceTransformerii30,Nov,200730,Nov,2007，，JunpingJunpingHeHeB1:Capacitivecouplingeffect:CapacitorbetweendraintoheatsinkCapacitorbetweenhighdv/dttraceormetaltoearthGDSheatsinkDheatsinkhighdv/dtPCBtraceearthVsicm30,Nov,200730,Nov,2007，，JunpingJunpingHeHeB2:Inductivecouplingeffect:Thereisacouplinginductorbetweenevery-twoloops!Typicalmagneticloops:Inductor1:Transformer:XZY边柱侧线包侧磁力线Inductor2:B边柱线包xyz30,Nov,200730,Nov,2007，，JunpingJunpingHeHe开关管M1PFCL1电解电容220uF电容0.47uFCM216mH电容Cx0.33uFCM11mH输入端子输出端子工频整流桥HighfrequencyACloopsInductivecoupling:produceEMIdirectlysometimeÎsensitivecircuitcomplicitEMIcouplingpaths.ÎinfluenceEMIfilterperformance.30,Nov,200730,Nov,2007，，JunpingJunpingHeHeTotalEMIcouplingpaths30,Nov,200730,Nov,2007，，JunpingJunpingHeHe2.1.3电力电子装置电磁干扰的共模/差模分析Why?Example:SinglephaseEmissiononLline:VLEmissiononLline:VN2/DMCMLVVV+=2/DMCMNVVV−=2/)(NLCMVVV+=)(NLDMVVV−=So,VL&VNVcm&Vdmaresame!Vcm&Vdm30,Nov,200730,Nov,2007，，JunpingJunpingHeHeWhy?因为差模回路和共模回路有不同的特点和性质，分开考虑，便于把握EMI形成、传播和抑制。差模回路：voltageorcurrentbetweenL&NoramongL1、L2、L3Equivalentinternalimpedanceissmall!Pathsisclear!共模回路：voltageorcurrentbetweenlinesandEarthEquivalentinternalimpedanceislarge!Pathsisunclearinmostcase!ThroughparasiticcapacitorThroughlines-loadExample1ofFlyback30,Nov,200730,Nov,2007，，JunpingJunpingHeHeS1D1LaD2D5CdRdD3D4NoisePathofDMNoisewithoutLISNExample2ofaBoostPFCS1D1LaD2D5CdRdD3D4NoisePathofCMNoisewithoutLISNCM30,Nov,200730,Nov,2007，，JunpingJunpingHeHeExample3ofaDriver30,Nov,200730,Nov,2007，，JunpingJunpingHeHeUse-nessofDM/CMAnalysis：ItisveryusefulforEMIfilterdesignandEMIdebug!DMEMIfiltertocontrolDMemission!IthasnoinfluenceonCMEMI.LDM1LDM1Cx1LDM2LDM2Cx2Generally,CxislargeseveraluF,Ldmissmall!30,Nov,200730,Nov,2007，，JunpingJunpingHeHeCMEMIfiltertocontrolCMemission!LCM2Cy1Cy1IthasnoinfluenceonDMEMI.LCM130,Nov,200730,Nov,2007，，JunpingJunpingHeHeAnactualEMIfiltertocontrolEMIemission!CMfilter+DMfilterTheleakageinductanceofCMchokecanbeusedasLDMLCM2Cy1Cx2Cy1LCM1Cx130,Nov,200730,Nov,2007，，JunpingJunpingHeHeItisseemthatEMIpathsissimpleandclearinaboveexamples!Butinfactifweconsidercouplingeffectamongany-twocomponents,linesandearth,theDM/CMcanbebecomeverycomplicatedsometime!30,Nov,200730,Nov,2007，，JunpingJunpingHeHe2.2电力电子装置传导干扰发射的预测两种主要方法：时域仿真法、频域法时域仿真法1:BuildhighfrequencymodelofcomponentsandthePCB;2:ExtractparasiticparametersbetweenthecomponentsandthePCB3:PredictEMIemissionwithcircuitsimulator.4:CompliancecheckandoptimizationoflayoutBuildhighfrequencymodelofcomponentsExtractparasiticparameterofPCBModelLibrarySpecificationEMISimulation30,Nov,200730,Nov,2007，，JunpingJunpingHeHeA:HighFrequencyModelofPassiveElementsA:HighFrequencyModelofPassiveElementsResistorsCapacitorsInductorspCRkLfdecdB/20−decdB/20+pRCπ21pkCLπ21ZESLESRCfZ0f0LESREPCfZ0factf030,Nov,200730,Nov,2007，，JunpingJunpingHeHeTransformersWiresZLpc2/r2/r2/iL2/iL2/iL2/iL2/eL2/eL2/r2/r1r2r1c2c3cpR2pR2slpL2pL2nHints:1:Parasi