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Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
Thanks for the links, I am after a large ferrite core so i can take a stab at a homemade transformer, i dont have any specs, this more of a trial and error experiment. I was thinking something like this size anyone have any other links for a high voltage ferrite core?
Thanks again
Side note, since this is the high voltage forum, i got a small FBT to start an arc 2 1/2 inches away shortly before it died.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Tom Williamson wrote ...
the specs im after are:
im going to have 7.2Kw in (230v @ 30A)
4 secondaries for series and paralleling depending on what power i want
with 100% efficancy i should get about
18mA per secondary at 10Kv
im probibly wrong somewhere though
im not sure if anything of this is possible im just stepping into the shore of transformer design and building
I'd suggest possibly using four cores if you want four secondaries. (I'm planning on using two cores). I'm aiming for 50kV, but I'm aware of the problems involved. Primaries will probably be in parallel (maybe series, using a higher voltage, not sure yet).
Using four cores, four primaries and four secondaries would allow you to connect the secondaries in series or parallel, but I agree with the post that says this is not usually successful. (I think it was Bwang)
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
hmm im frankly just not sure about any of this transformer design stuff is there any good resources that can show me how do design ferrite HV transformers, work out the core volume and other things i need to know?
ive been googleing during lunch brakes and havent found much that will fully explain how to make transformers with ferrite
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
I'd second what Mattski said. The link I posted above has a section on design.
Also, the spec sheet I posted above gives you an idea of what power you can expect and at what frequency for a given CSA, for a core similar to N27, ie one that is most efficient at around 25kHz, but will go up to 100kHz.
I worked it out by choosing the frequency (25kHz) then checking the spec. sheet for power rating in push-pull (H-bridge, etc), which gives a figure of 2.445kW per core.
Knowing this is best I can achieve with good efficiency is a good place to start. Two cores will give me around 5kW, so I just need to pump 2.5kW through each core at 25kHz and see what happens. No 'real' maths involved.
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Ferrite Transformer
