ferrite.png

 

This is the ferrite core 30A/65A

 

Fair Rite 0475176451 for 65A

Fair Rite 0475164181 for 30A

 

Those ferrites are not high current model, so, need put a gap

Enphase has applied 0.065mm Kapton Tape one 4 sides, and it makes 0.26mm gap.

 

This is the reference table

table.png

 

65A model can support upto 72A with 70% of Bs

30A model can support upto 53A with 70% of Bs

 

I have used 0.1mm x 2 = 0.2mm tape to reduce the gap, and reduced current as 56A.

and, 2 pass widing to increase the impedance 4x, and reduce the staturation current as 28A.

using 4 ferrites, I have set 19Ohm @ 110kHz

I want to