How much power can a "35" transformer make?

[370forlife]

That new Rosewill Deer 350W has a "35" labeled transformer. (labeled as ERL-35-2005)

I just noticed the HEC made Xigmatec NRP-PC502 500W psu also has a "35" labeled transformer (labeled as ERL-35-24) as seen in the second-down picture here: http://www.jonnyguru.com/modules.php...tory4&reid=158

so can a "35" labeled transformer do 500w, as the HEC's obviously did.

[linuxguru]

Re: How much power can a "35" transformer make?

Depends on the switching frequency, the max magnetic flux density that the ferrite can handle without excessive heating, and the engineering design margins. As a rule of the thumb, for commodity ferrite EI or EE transformers in a conventional half-bridge topology with BJT switchers (almost all PC PSUs), 35-size primary transformers can handle about 250..350W.

[370forlife]

Re: How much power can a "35" transformer make?

So about 99% of the time they can only do 250-350W unless they are a special type of transformer?

[linuxguru]

Re: How much power can a "35" transformer make?

Yes, for almost all commodity designs. It's possible to go higher with specialty ferrites, higher switching frequencies and MOSFET switchers, but you won't generally see those in PC PSUs, which are price-sensitive and use commodity parts where possible.

[yanz]

Re: How much power can a "35" transformer make?

that deer "35" transformer is a fake "35" transformer. it maybe just a "33" transformer.

[370forlife]

Re: How much power can a "35" transformer make?

that deer "35" transformer is a fake "35" transformer. it maybe just a "33" transformer.

The one in the new one is an actual "35" transformer, but in the old deer I rebuilt a while back, that was a fake "35" just a relabeled 33.

[yanz]

Re: How much power can a "35" transformer make?

i see. i have a hec 300W (working) that has a "ERL-35" transformer, and it is taller about 1 cm(?) than the deer's.

[370forlife]

Re: How much power can a "35" transformer make?

The one in the new deer is about 1/4" taller than the "35" in my old deer.