EMC设计认证高级班培训教材

1EMC+PCB2220V220VESD’’’’EMC89/336/EECEMCEMCCCCCCC—ChinaCompulsoryCertification200351200251FCCFCCFCC3CENELEC—1973ETSIANSI19831996EMCIEC—1906CISPR—10KHzTC77—//EMC4EMC(1.2)•••••()5EUT0.8m1~4m13102017.32101~40.8163210311V/m801000MHz(1kHz80%)1kHz80801000MHz17a.b.c.d.adbcEUT50ohmLISN0.8m/LISNLISN50ohm81(EFT)()I/OkHzkVkHzkV50.2550.5150.551251523522.544(10%)(20%)100mm,EUT100mmEUT100mmEUT1/EUT1m100pf92(Surge)1.022.034.040.51(10%)kV10/700usVAEUT251min103(ESD),kV,kV212183631548442421b—1a—I1.6×0.8mEUT500mmEUT100mmEUT1m2500mm470kΩ=EUT100mm111/s104(50Hz220/380V)16AACV1357911ABC()D600W12----------220V0V——Earth)+++++13213“----Z=0”PCBEMCVGVZZ=0✦EMCZ=RAC+jωLδ=1/(πfµσ)1/2RAC=0.076rf1/2RDCδr0.37IIACACSlR⋅=σl)()75.043.2ln(2.0HdllLµ−⋅⋅=14Hzd=0.65cm10cm1md=0.27cm10cm1md=0.06cm10cm1md=0.04cm10cm1m10Hz51.4µ517µ327µ3.28m5.29m52.9m13.3m133m1k429µ7.14m632µ8.91m5.34m53.9m14m144m100k42.6m712m54m828m71.6m1.090.3m1.071M426m7.12540m8.28714m10783m10.65M2.1335.52.741.33.57503.865310M4.2671.25.482.87.141007.710650M21.33562741435.750038.5530100M42.65471.477150M63.9811071152mV200mV2mV-10mV10mV~20mV20mV~100mV100mV~200mVPCB01020304050102030405060708090100fohm/VGIVG(LF)C1550kHzCPVGVSVNRLC2VG12C12RLVGVSCpRLVGVS16VsR1R1RLLVGIN1IN2ISVS+VNω=R1/LVN/VGRL/RS+RLMfVGRS1VS1RS2RL2RL1VS2IN1IN2ISVL12I1ZgVNVN=I1ZgI1I2Z2Z1ZgV2V1V~~~1217213213I1I2I3213I1I2I318)2tan()0(tZjZcλπ=)sinh()cosh()()sinh()cosh()(0000xZUxIxIxZIxUxUccγγγγ−=−=0xtXU0I0U(x)I(x)UtItZt=0cZ,γ{00.050.10.150.20.25012345678910abS[Z(x)/Zc]213192131f1MHzf10MHz~SPGMPGSPG20PCB(1MHz)()220VACLNPE220VACLNPE(10MHz),1/20/20PCB211000V:12123220.6VTπL1L223LCDMCMIDM~ICMVCM~ICMLNPEC1L1C2C3L2L3C5C4C1C4C5XC2C3YL1L2L3LL24Y()UfICYπ20XCLRZfofLCZfofCLRCL25µµ(µr10000)C1/C2:10~100Zff1f2TILf26ZZ=jωL+RfRZFL)()1(log2010dBZZZILTSF++=f(Hz)Z()1M10M100M1G1101001000Ur=125Ur=2700Ur=850f(Hz)Z()1M10M100M1G1101001000OneturnTwoturns/—20dB/27LNPE250VAC50/60HzDC—400Hz1mA—2000VAC1—1700VAC1-25~8510Aat40!28ZPCB×××滤波器××29SEAR+B(dB)()(rrr)r=/cuSE=20log10(E1/E2)dB0.1mm3456789100150200250300350400450500frequencySE(dB)对于平面波，金属材料作屏蔽体足以满足屏蔽要求0.5mm30)()()()(1502220MHzhkwnlmf++=hwl,,knm,,012…LLh31FDTD33cm230cm30cm30cmf051015202530354045500102030405060SEeandSEmalongthecentrallinekshieldingeffectiveness(dB)SEeSEm05101520253035404550-50510152025SEeandSEmalongthecentrallinekshieldingeffectiveness(dB)SEeSEmAB32()()()()331GHz34SE40dB,5mm×××36035ØØØ1.mmØØ0.6VØ3602.ØØØ36PCBPITdtrtr=d+tr10.5V(t)t∑∞=Φ++=1)2(cos)(nnntTnCTtVπτTtnTtnTnTnTCrrnππτπτπτ)sin()sin(2=Ttnrn)(+−=ΦτπPCBA1=2/TA2=0.64/TfA3=0.2/Ttrf21/π1/πtr-20dB/dec-40dB/decA1A2A3PCBPCB3nS5nS10nS9nS50nSSTTLLSTTLTTLHCMOSCMOS37L=0.002S(2.3lg(2S/W)+0.5µHWSL=(L1L2-M2)/(L1+L2-2M)L1=L2L=(L1+M)/2MIIExample1:IPCB1324DM/CMRF)VCCCICEVCC38CICEVCCVtIC∆∆⋅∆=IVCCtICVVCCI=20mAC=2nFt=10nSV=100mVpoorgoodVCC39E=KfLI––E=Kf2AIE=2.6IAf2/DµV/m1/πd1/πtr40dB/decfff-20dB/dec-40dB/decE=2.6IAf2/DEdB=20lg2.6IA/D+40lgf40dB/dec20dB/decE=2.6IAf2/D40PCBPCB12DC~0.51101001G110mΩ/41DMDMA/DL75mm25mmL:0~10cmVAB:15~75mVAB1.5mmPGA128-pinC/4PGA1010010.1nH/cm255075100mmABCD42ABCDABCD/++λ/20LI2HCPI3I1CPVCM43LCPICMRWRWLZCM=RW+jωL+RL+1/jωC“”VCM?20H20H20HDigitalpowerAnalogpowerDigitalgroundAnaloggroundMoat4420H3mmICM:E=1430IL/(fD3)µV/m:E=0.63ILf/DµV/mE=1.26ILf/DµV/mLλ/2λ/4E=120I/DµV/mLE=1.26ILf/D+Vcc-Vcc+V-VZ0/2Z0/245PCBPCB=20lg(E1/E2)=20lg(ICM1/ICM2)=20lg[(VCM/ZCM1)/(VCM/ZCM2)]=20lg(ZCM2/ZCM1)=20lg(1+ZL/ZCM1)dBRR10ns100ns50ns0.5~1µstr30pF100pF150pF2400pFC100~150Ω300Ω100Ω120ΩR32MHz3.2MHz6MHz320kHzBWTTLCMOS2MB/s10~100kB/s46/CMCMDMCMCMCMCMDMVVIZT=V/I471021031041051061071080.0010.010.1110100100010000mΩ/mHz+µ+µDPCBPCBHHDtrace1trace22)(1),(HDLtKr+=PCB1.3W48PCB3☯☯52Ø5.GuidelinePCB1GHz1/20PCB1/20PCB