电感计算公式L6562_flyback
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L6562 Transformer Calculate Tools
1.Design Specifications
Vinmin=85VAC Vinmax=135VAC
Fl=50Hz
Vo=24VDC
Io=0.8A
Vaux=16V
Δvop-p=1V
2.Pre-design Choices
Fsmin=55KHz
Vor=100V
η=85%
3.Preliminary Caculations
Vpkmin=Vinmin×1.414=120.19V
Vpkmax=Vinmax×1.414=190.89V
Po=Vo×Io=19.2W
Pin=Po/η=22.58824W
Kv=Vpkmin/Vor= 1.2019
F1(Kv)=(0.637+0.0046×Kv)/(1+0.729×Kv)=0.3424655
F2(Kv)=(0.5+0.0014×Kv)/(1+0.815×Kv)=0.2534329
F3(Kv)=(0.424+0.00057×Kv)/(1+0.862×Kv)=0.2085841
F5(Kv)=(0.5+0.0014×Kv)/(1+0.815×Kv)=0.5
4.Operating Conditions
Ipkp=2Pin/(Vpkmin×F2(Kv))= 1.483136A
Irmsp=Ipkp×sqrt(F2(Kv)/3)0.431074A
Ipks=2Io/(Kv×F2(Kv))= 5.252774A
Irmss=Ipks×sqrt(Kv×F3(Kv)/3) 1.518458A
5.Transformer
Lp=Vpkmin/((1+Kv)×Fsmin×Ipkp)=669.1555uH Lpreal=680uH
n=Vor/(Vo+Vf)= 4.065041
(a.)Choose Transformer Core
Ae=54mm2
ΔB=0.24Gs
(b.)Transformer Caculations
Np=Lp×Ipkp/(Ae×ΔB)=
76.57783T Npreal=77T
Ns=Npreal/n=18.942T Nsreal=19T
Naux=(Vaux+0.6)×Nsreal/(Vo+0.6)=12.82114T Nauxreal=13T
Lg=0.4×π×Npreal2×Ae/Lpreal=0.591365mm