IGBT热损耗计算

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1、3.3IGBTIGBTPfw/T1.vCEsat=f(iC,vGE)2.3.Pon/TPoff/T1.2.3.4.IGBTPtot/T=Pfw/T+Pon/T+Poff/TPfw/D1.vF=f(iF)2.3.IGBT1.2.3.4.Ptot/D=Pfw/D+Poff/DnIGBTmPtot/M=(n*Ptot/T)+(m*Ptot/D)3.4IGBTPon/T=fs*Eon/T(vdiLLTj/T)Poff/T=fs*Eoff/T(vdiLHTj/T)1t1Pfw/T=iC(t)•VCE(t)dtT0Pfw/T=i

2、Lavg*vCEsat(iLavgTj/T)*(t1/T)=iLavg*vCEsat(iLavgTj/T)*DTDTiLavgPoff/D=fs*Eoff/D(vdiLLTj/D)1TPfw/T=vF(t)•iF(t)dtTt1Pfw/D=iLavg*vF(iLavgTj/D)*(1-DT)=iLavg*vF(iLavgTj/D)*(DD)DDIGBTIGBT3.5vrefvhfoutfsˆvrefvˆhm0m1IGBTIGBTT1D2IGBT3.2.1.25060HzIGBT1.[194]y=f(x)=A+Bx+C

3、x2ABC3.1-3.41.2.50Hz3.4.y=A+BxIGBTIGBTT11tdeadAfw/TˆˆBfw/T2Afw/TˆˆBfw/T2Pfw/T1=-••i1+•i1+m•cos••i1+•i1(3.1)2Ts483DiodeD21tdeadAfw/DˆˆBfw/D2Afw/DˆˆBfw/D2Pfw/D2=+••i1+•i1–m•cos••i1+•i1(3.2)2Ts483tdeadtdead3.61200V/50AIGBTtdeady=Bx+Cx2IGBTIGBTT1Pon+off/T1=fs•iˆ1Bo

4、n+off/T+Bon+off/T•ˆi1(3.3)4DiodeD2Poff/D1=fs•iˆ1Boff/D+Coff/D•ˆi1(3.4)41200V/50AIGBT3.7a)b)mcosIGBT1.31.4m*cos=0.64m*cos=0.1m*cos=-0.64IGBT2.1.2.50Hz3.4.5.fs>>foutIGBTT1y=A+BxvCEsatvCEsat(t)=VCE0+rCE•iˆC(t)=VCE0+rCE•iˆ1sintVCE0iC=0rCEIGBTIGBTT11VCE0ˆˆrCE2VCE0ˆˆ

5、rCE2Pfw/T1=•i1+•i1+m•cos••i1+•i1(3.5)2483D2y=A+BxvFvF(t)=VF0+rF•iF(t)=VF0+rF•iˆ1sintVF0iF=0rFD21VF0ˆˆrF2VF0ˆˆrF2Pfw/D2=•i1+•i1–m•cos••i1+•i1(3.6)2483IGBTT1IGBTP1ˆiˆion+off/T1=•fs•Eon/T1+Eon/T1(3.7)3.7IGBTIGBTD21Poff/D2=•fs•Eoff/Dˆi1(3.8)3.83.83.5T1D2T2D1