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4hv.org :: Forums :: High Voltage
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Winding your own ferrite transformer

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Thomas W
Wed Aug 17 2011, 06:50PM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
im afraid i wont be getting the cored £17 shipping :S
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Dr. ISOTOP
Wed Aug 17 2011, 09:03PM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
Ash Small wrote ...

bwang wrote ...

"Active snubbing" is definitely not essential, considering my transformer works without it.

Can you give us some more details about your transformer, Bwang?

Is there a thread on here about it?

What frequency does it run at?

Does the frequency vary with load?

What's the output voltage, etc?


Somewhere around 70 KHz, 50% duty cycle, 0.3 uF resonant capacitor with a simple Tl494 controller
The turns ratio is 200:8, but because of resonance, etc the unloaded output voltage is roughly twice what the ratio would predict.
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Ash Small
Wed Aug 17 2011, 09:07PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Tom Williamson wrote ...

im afraid i wont be getting the cored £17 shipping :S

I paid £5 each for my cores, I have four of them. I was offered them when I went to collect a diffusion pump and some other vacuum equipment, so I grabbed them on the spot. I think he found them at a hamfest or teslathon or something, when he was intending to use them for a fusor power supply, I think. One of those projects that never got finished.

I have some numbers for EPCOS agents in the south of England somewhere if you are interested, I think they usually come in packs of ten (five pairs), but I might have a another couple of pairs if you don't want them all, but you can definitely find cheap, unused, large cores 'second hand'.

bwang wrote ...


Somewhere around 70 KHz, 50% duty cycle, 0.3 uF resonant capacitor with a simple Tl494 controller
The turns ratio is 200:8, but because of resonance, etc the unloaded output voltage is roughly twice what the ratio would predict.

What's the input voltage? 170V?
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Adam Munich
Wed Aug 17 2011, 10:49PM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
TSC is backlogged right now. They had power failures that destroyed many cores...
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