cupoftea
Advanced Member level 5
Hi,
We are doing 165W PFC (200VAC in, 390Vout, 60kHz)
L = 270uH.
Inductor = MS sendust torroid with 60 turns. (MS 157060-2)
With the attached excel spreadsheet it is calculated that the peak B is 0.15T (at 3.5A). The very long excel calculation attached had to be used to get Bpk. There is nowhere in the below catalog where an equation is to be found for this. Would you agree?
The method involved splitting the ur vs H graph for 60u sendust into linear sections, and thus finding equations giving ur at any H. Then H had to be “stepped”…giving deltaB = uo.ur.deltaH…….so then Bpk was calculated by adding up all the deltaB’s.
This is an extraordinarily long winded way, but there is no other way, would you agree?
MS 157060-2
(LTspice of PFC, and excel calc of inductor Bpk attached)
We are doing 165W PFC (200VAC in, 390Vout, 60kHz)
L = 270uH.
Inductor = MS sendust torroid with 60 turns. (MS 157060-2)
With the attached excel spreadsheet it is calculated that the peak B is 0.15T (at 3.5A). The very long excel calculation attached had to be used to get Bpk. There is nowhere in the below catalog where an equation is to be found for this. Would you agree?
The method involved splitting the ur vs H graph for 60u sendust into linear sections, and thus finding equations giving ur at any H. Then H had to be “stepped”…giving deltaB = uo.ur.deltaH…….so then Bpk was calculated by adding up all the deltaB’s.
This is an extraordinarily long winded way, but there is no other way, would you agree?
MS 157060-2
Literature - Micrometals
www.micrometals.com
(LTspice of PFC, and excel calc of inductor Bpk attached)