T
treez
Guest
Hello,
We need to wind a flyback transformer on a Ferroxcube PQ3535 former. We need 20 primary turns interleaved between two layers of 10 secondary turns (ie Np = 20, Ns = 20)
Irms(sec) = 0.77Arms
Irms(pri) = 1.4Arms
The PQ3535 bobbin is 20.8mm in winding length.
As such, we would need the Secondary wire diameter to be 2mm in order to arrange its layers to span along the full length of the bobbin (as you know this is necessary to reduce leakage inductance). However, 2mm Enamelled wire is too unwieldy to wind easily. Therefore, we will instead simply scrap the idea of winding right across the bobbin, and simply wind 20 turns of bifilar TEX-ELZ triple insulated wire for primary and secondary. (we will use 7/0.17 TEX-ELZ)
Do you think that this bifilar winding (primary and secondary twisted together then wound together) will give as low leakage inductance as interleave winding of primary and secondary, even if it doesn’t quite span the full length of the bobbin.?
Ferroxcube PQ3535 bobbin
https://www.ferroxcube.com/FerroxcubeCorporateReception/datasheet/pq3535.pdf
TEX-ELZ triple insulated wire
https://www.furukawa.co.jp/tex-e/en/product/texelz.html
We need to wind a flyback transformer on a Ferroxcube PQ3535 former. We need 20 primary turns interleaved between two layers of 10 secondary turns (ie Np = 20, Ns = 20)
Irms(sec) = 0.77Arms
Irms(pri) = 1.4Arms
The PQ3535 bobbin is 20.8mm in winding length.
As such, we would need the Secondary wire diameter to be 2mm in order to arrange its layers to span along the full length of the bobbin (as you know this is necessary to reduce leakage inductance). However, 2mm Enamelled wire is too unwieldy to wind easily. Therefore, we will instead simply scrap the idea of winding right across the bobbin, and simply wind 20 turns of bifilar TEX-ELZ triple insulated wire for primary and secondary. (we will use 7/0.17 TEX-ELZ)
Do you think that this bifilar winding (primary and secondary twisted together then wound together) will give as low leakage inductance as interleave winding of primary and secondary, even if it doesn’t quite span the full length of the bobbin.?
Ferroxcube PQ3535 bobbin
https://www.ferroxcube.com/FerroxcubeCorporateReception/datasheet/pq3535.pdf
TEX-ELZ triple insulated wire
https://www.furukawa.co.jp/tex-e/en/product/texelz.html