电磁兼容技术全面培训(杨继深)

20024„„„20024„„„20024•1996“”•1997“GJB-151”•1998“”•1999“”•2001“”•2002“”20024„„„„„„„„20024••••••20024„„„„„20024220AC2002420024TEMPESTTEMPEST20024TEMPEST//200241.dV/dtdI/dt2.20024NEMPESD20024V20024-------+++++++VV20024VGPCBPCB2002420024//2002420024IECCISPRCISPRPub.××IECTC77IEC×××××CENELECEN×××××FCCDODFCCPart××,MIL-STD.×××VCCIVCCI,GB××××-××××GJB×××-××20024•••••20024()20024EUT1~4m0.8m131030200242017.32101~40.82002420024EUT200242002421200242002420024AF=E/VE=V/mV=200242002420024200242002420024LISNAMN20024LISN2002420024EUT22002420024EFTFTB15ms(5kHz)300ms200241100pf20024100mm,EUT100mmEUT100mmEUT120024I20024200241.6×0.8mEUT500mmEUT100mmEUT1m2500mm470kΩ=EUT100mm20024VV135791113200242002420024200242002420024(dB)10lgP2P1P1P220lgV2V1I2I120lg200241V1mV1µV1µV=0dBµVdBVdBmVdBµV1A1mA1µAdBAdBmAdBµA1V/m1µV/mdBV/mdBµV/m1W1mWdBWdBm20024()()EMC2002420024dT1/πd1/πtrtr-20dB/dec-40dB/decAV(orI)=2A(d+tr)/TV(orI)=0.64A/TfV(orI)=0.2A/Ttrf2200241220024„„„„„200240V220V+++++2002420024V=IR20024100mV~200mV2mV10mV~20mV200mV20mV~100mV2mV~10mV20024Z=RAC+jωLL≈1µH/mδδ=1/(πfµrσr)1/2RAC=0.076rf1/2RDCr0.37II20024Hzd=0.65cm10cm1md=0.27cm10cm1md=0.06cm10cm1md=0.04cm10cm1m10Hz51.4µ517µ327µ3.28m5.29m52.9m13.3m133m1k429µ7.14m632µ8.91m5.34m53.9m14m144m100k42.6m712m54m828m71.6m1.090.3m1.071M426m7.12540m8.28714m10783m10.65M2.1335.52.741.33.57503.865310M4.2671.25.482.87.141007.710650M21.33562741435.750038.5530100M42.65471.477150M63.98110711520024/0.60.50.40.30.20.1012345678910S/W20024IGVNI1I2VG20024CPVGVSVNRL2C2VGC12120024CpRLVGVSRLVSVG20024LVsR1R1RLVGIN1IN2ISVS+VNMω=R1/LRL/RS+RLVN/VGf20024VGRS1VS1RS2RL2RL1VS2IN1IN2ISVL200241212V~~~122002420024123123I1I2I3I2ABI1CABR2R3CR1I3200241232002420024LLRRZ0=(L/C)1/2CCFP1=1/2π(LC)1/2ZP=(ωL)2/RRACRDC20024R1R2R3L1L2L312320024~VsRs~VsRs20024C1SC3SC1SC3SC2SC2S2002420024••20024E2E1,:SE=20lg(E1/E2)dB20024SER1R2ABRABBAR1R220024E∝1/r3H∝1/r2H∝1/r3E∝1/r2E∝1/rH∝1/r377E/HΩλ/2πr20024tE0E1δ0.37E0E1=E0e-t/δA20lg(E0/E1)=20lg(et/δ)dBA8.69(t/δ)dBA=3.34t√fµrσrdB2002420024R20lgZW4ZsZS=3.68×10-7√fµr/σr377Ω20024377:R20lg4Zs4500dB:R20lg2DfDfZsZs:R20lgZs=D=mf=MHz20024R(dB)1500.1k1k10k100k1M10M100M3×108/2πrr=30mr=1mr=30mr=1mf20024(0.5mm)250150r=0.5mr=0.5mdB00.1k1k10k100k1M10M20024B=20lg(1-e-2t/δ)•B••2002420024H0H1R0RsRsSE=1+R0/RSH0H1R02002420024µr10315µ10510.010.11.010100kHz20024Bµ=∆B/∆HH200242002410080604020101001k10k200242002420024L≡HLSE=100–20lgL–20lgf+20lg1+2.3lg(L/H))=0dBL≥λ/220024ZC7.9/DfSE=48+20lgZC–20lgLf+20lg(1+2.3lg(L/H))ZC7.9/DfSE=20lg(πD/L)+20lg(1+2.3lg(L/H))200242002420024•()•()•()•()•200242002420024¾()¾¾¾¾¾2002420024fc2002432t/d27.2t/l+=2002420024SESEffc5f20024/2002420024200242002436036020024••••20024200242.5mΩ!VI20024~Z=V/IVI200242002420024/-2.37-1.85+0.34-1.66-0.76-0.74+0.799//-0.44+1.200-0.4+1.420-0.25-0.14-0.13IIIIVIII2002420024„EMC„„„„20024200242002420024~~20024/IDMICMVVICMICM200241.50Hz13572.1MHz1MHz200243dB20024TCΓΓLπ2002420406080100fc10fc100fc1000fc5432120N/6N/dB200245010020dB4×6=24204101001×20=201220dBLC20024CππΓΓΓΓLL20024~Fco=1/(2πRpC)IL=20lg(ωCRp)ILIL=20lg(ωL/Rs)ZsCZL~ZsLZLFco=Rs/(2πLZsZLZsZL20024LCRRL=R/2πFCC=1/2πRFCTTππL/2C/2200241.6mmZCf(MHZ)1µF1.70.1µF40.01µF12.63300pF19.31100pF33680pF42.5330pF601/2π√LCCL200241nf1M100k1010.110k1k10010Hz1001k10k100k1M10M100M1G100pf10nf100nf10µf1µf10mf100µf1m10cm1cm1mmΩ20024200240.15-0.150-551255-150-55125-10-5COGX7R-6020-3090-300Y5V30%∆C%∆C%∆C20024COGX7RY5V200-20-40-60-80020406080100%Vdc%∆C20024ZL1/2π√LCµH(MHZ)3.4458.828685.71252.65001.2fLC20024CTTCTCCTCCTT20024LC20024T30701GHz2060402002491282002420024200241GHz20024RF20024••••2002420024C=4.28pfC=3.48pf19%C=51pfC=49pf4%200241.402.3.“”4.2002420024µr=500~10000R=0.1~100Ωmµr=10~100R=1k~1MΩmµr1000020024Z=jωL+RLR(f)RZω1MHz10MHz100MHz1000MHz20024Ω110100100012545001250600300300.11101001000½1½ΩΩΩ2002420024200242002420024200242002420024π200242002430MHz50Ω20024200242002450Ω/50Ω100Ω/0.1Ω0.1Ω/100Ω0-10200240.1Ω100Ω~~100Ω0.1Ω50Ω0.1/100Ω020024200242002420024PCBPCB20024PCB20024PCBPCB200242002420024PCBPCB20024trdT1/πd1/πtr-20dB/dec-40dB/decAV(orI)=2A(d+tr)/TV(orI)=0.64A/TfV(orI)=0.2A/Ttrf22002420024Q1Q2Q3Q4R4R2R3R1VCCICCIIIVgIg20024ICCVCCIgVg20024132420024L=0.002S(2.3lg(2S/W)+0.5µHWSL=(L1L2-M2)/(L1+L2-2M)L1=L2L=(L1+M)/2MII20024200242002420024dIdtZC=dVdtdIdIdVf1/2π√LC20024200242002420024AI:H=IA/(4πD3)A/mE=Z0IA/(2λD2)V/mZW=Z02πD/λΩ:H=πIA/(λ2D)A/mE=Z0πIA/(λ2D)V/mZW=Z0=377ΩZ0fD20024:H=IL/(4πD2)A/mE=Z0ILλ/(8π2D3)V/mZW=Z0λ/2πDΩ:H=IL/(2λD)A/mE=Z0IL/(2λD)V/mILZ0fD20024ZGZLV~IZC=ZG+ZL=AZC≥7.9DfE=7.96VA/D3µV/mZC≤7.9DfE=63IAf/D2µV/mH=7.96IA/D3µA/mE=1.3IAf2/DµV/m20024E=2.6IAf2/DµV/m200241/πd1/πtr40dB/dec-20dB/dec-40dB/decff40dB/dec20dB/decE=2.6IAf2/DEdB=20lg2.6IA/D+40lgff20024EMIEMIcm24MHz10301004000B406100040074HC620504518674LS65020187.22.474AC3.5805.52.20.750.2574F3805.52.20.750.2574AS1.412020.830.15N√N20024E=2.6IAf2/D20024dBµV/mdBµV/m1101001000110100100020024~LRIZ=R+jωLL=Φ/IΦ∝A~200242002468HC1174HC00ABABE200242002412101mΩ/DC~0.51101001G2002475mmA/DLAB25mmL:0~10cmVAB:15~75mV200241.5mmPGA128-pinnH/cm1001010.1C/4255075100PGAmm2002420H20024DCBAABCD20024