Bjtpower
Full Member level 5
Core (Inductor) selection for PFC
Dear Friends
Here i am designing a PFC for my application
Design Inputs are
Vin(Min)=200vac
Vin(Max)=265 vac
Output power:400 Watts
Frequency of Converter : 100KHZ
Inductor Ripple Factor:10%
i have calculated some values
Dmin:0.31,Dmax:0.49
I avg (Low voltage):2.45 Amp
Iavg(High Voltage):1.81 Amp
i have used the Formula to calculate the Inductance at high Voltage
L=(Voltage across Inductor) x D(min) x time/(inductor Ripple)
L=(264 X 0.31 X 10X10^-6)/0.38=2.145 mH
Worst case current at low voltage:Imax+(10%of inductor ripple/2)=2.45+0.12=2.57 Amp
Now,
LI^2=2.14 (mH) X (2.57^2)=14.13
now, i have to search the core in TDK/EPCOS (not in Magnetics) i know magnetics approch but it is too costly and samples is not possible easily.
How to go, Pls help me step by step process to select the core
Thanks
Marx
Dear Friends
Here i am designing a PFC for my application
Design Inputs are
Vin(Min)=200vac
Vin(Max)=265 vac
Output power:400 Watts
Frequency of Converter : 100KHZ
Inductor Ripple Factor:10%
i have calculated some values
Dmin:0.31,Dmax:0.49
I avg (Low voltage):2.45 Amp
Iavg(High Voltage):1.81 Amp
i have used the Formula to calculate the Inductance at high Voltage
L=(Voltage across Inductor) x D(min) x time/(inductor Ripple)
L=(264 X 0.31 X 10X10^-6)/0.38=2.145 mH
Worst case current at low voltage:Imax+(10%of inductor ripple/2)=2.45+0.12=2.57 Amp
Now,
LI^2=2.14 (mH) X (2.57^2)=14.13
now, i have to search the core in TDK/EPCOS (not in Magnetics) i know magnetics approch but it is too costly and samples is not possible easily.
How to go, Pls help me step by step process to select the core
Thanks
Marx