电磁兼容技术完整培训(杨继深)

20024„„„„„„•1996“”•1997“GJB-151”•1998“”•1999“”•2001“”•2002“”„„„„„„„„••••••„„„„„××IECTC77IEC×××××CENELECEN×××××FCCDODFCCPart××,MIL-STD.×××VCCIVCCI,GB××××-××××GJB×××-×ו••••()~4m0.8m131030~40.8=E/VE=V/mV=(5kHz)300ms×0.8mEUT500mmEUT100mmEUT1m2500mm470kΩ=EUT100mm(dB)10lgP2P1P1P220lgV2V1I2I120lg=0dBµVdBVdBmVdBµV1A1mA1µAdBAdBmAdBµA1V/m1µV/mdBV/mdBµV/m1W1mWdBWdBm()()EMCπd1/πtrtr-20dB/dec-40dB/decAV(orI)=2A(d+tr)/TV(orI)=0.64A/TfV(orI)=0.2A/Ttrf2„„„„„=IR~200mV2mV10mV~20mV200mV20mV~100mV2mV~10mV=RAC+jωLL≈1µH/mδδ=1/(πfµrσr)1/2RAC=0.076rf1/2RDCr0.37II=0.65cm10cm1md=0.27cm10cm1md=0.06cm10cm1md=0.04cm10cm1m10Hz51.4µ517µ327µ3.28m5.29m52.9m13.3m133m1k429µ7.14m632µ8.91m5.34m53.9m14m144m100k42.6m712m54m828m71.6m1.090.3m1.071M426m7.12540m8.28714m10783m10.65M2.1335.52.741.33.57503.865310M4.2671.25.482.87.141007.710650M21.33562741435.750038.5530100M42.65471.477150M63.981107115ω=R1/LRL/RS+RLVN/VGf~~~12=(L/C)1/2CCFP1=1/2π(LC)1/2ZP=(ωL)2/RRACRDC~VsRs~VsRs••:SE=20lg(E1/E2)dB∝1/r3H∝1/r2H∝1/r3E∝1/r2E∝1/rH∝1/r377E/HΩλ/2πr=E0e-t/δA20lg(E0/E1)=20lg(et/δ)dBA8.69(t/δ)dBA=3.34t√fµrσrdB=3.68×10-7√fµr/σr377Ω:R20lg2DfDfZsZs:R20lgZs=D=mf=MHz(dB)1500.1k1k10k100k1M10M100M3×108/2πrr=30mr=1mr=30mr=1mf(0.5mm)250150r=0.5mr=0.5mdB00.1k1k10k100k1M10M=20lg(1-e-2t/δ)•B••=1+R0/RSH0H1R0µ=∆B/∆HH≡HLSE=100–20lgL–20lgf+20lg1+2.3lg(L/H))=0dBL≥λ/2=48+20lgZC–20lgLf+20lg(1+2.3lg(L/H))ZC7.9/DfSE=20lg(πD/L)+20lg(1+2.3lg(L/H))•()•()•()•()•¾()¾¾¾¾¾=••••Ω!VI~Z=V/IVI„EMC„„„„~~ΓΓLπ×6=24204101001×20=2012