Different Winding Losses from HFSS and Maxwell

[SenpaiAbdullah]

Hi, I have a planar transformer design and I am simulating it in HFSS and Maxwell to figure out the AC resistance and winding loss.

HFSS gives me higher losses by a factor of 2-3. My board copper thickness (2oz - 70um) is of same order as the skin depth at the operating frequency (75um at 1MHz). Which one to trust and what could be the cause of discrepancy.

Thanks

 

[Easy peasy]

Skin depth is that depth at which the current density falls to 37%, so for 70um there is still current crowding on the surfaces, more than this though, depending on layers in each winding you will get significant proximity effect at 1MHz.

 

[FvM]

Only you know what might be different between both models.

 

[SenpaiAbdullah]

Skin depth is that depth at which the current density falls to 37%, so for 70um there is still current crowding on the surfaces, more than this though, depending on layers in each winding you will get significant proximity effect at 1MHz.

Does Maxwell account for proximity effects?