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Registered Member #5171
Joined: Tue Jun 05 2012, 11:32AM
Location:
Posts: 67
Hello everyone. Today i'm making this new thread(yeah, again) to ask you some help about building a full bridge psu. The diagram i'm gonna use, is this one But.. something is really not clear at me. The most unclear thing, it's about these transformers, i mean the ones that have GDTA-GDTB, and GTDB-GDTA.. How should i make them? thanks in advance to everyone will help me.
Registered Member #1134
Joined: Tue Nov 20 2007, 04:39PM
Location: Bonnie Scotland
Posts: 351
They should be wound as per the descriptions espoused in the DRSSTC sections of his website.
The turns ratio will be about 1:2:2 for each GDT, on a suitable ferrite core. Do a quick search on here to see what core models other people are using, and what number of turns you should be using.
For example, for my GDT's I use large ferrite rings from Maplin, and find 10:20:20 turns quite suitable. I wind them with twisted pairs removed from CAT-5 cable.
Registered Member #1134
Joined: Tue Nov 20 2007, 04:39PM
Location: Bonnie Scotland
Posts: 351
Tom Williamson wrote ...
are these ferrite cores much good?
both me and Uleashed are working together on this :3
Probably not. From the description, it says they are powdered metal cores. Either buy cores for which there are proper specifications, or experiment with a few (this is how I found the cores from Maplin)
Registered Member #2405
Joined: Fri Oct 02 2009, 12:59AM
Location: Wisconsin
Posts: 140
Tom Williamson wrote ...
are these ferrite cores much good?
both me and Uleashed are working together on this :3
Tom, If you use cores that are made of 77 or 78 material then you should be good. All the cores I use I try to use that mix and they work fine. They are pretty common cores.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
You don't need toroids, Tom. E-cores will do.
RS supply a lot, but they tend to be more expensive than some places. They don't supply the big ones we like to use for H-bridges, but supply loads suitable for GDT's.
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Full-Bridge building
