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Registered Member #3943
Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
I am having trouble finding suitable ferrite cores for use in a gate drive transformer. I can find ones that are recommended on here online but the shipping prices to the UK are expensive.
For example I am not paying £15 delivery!
All the ones I have salvaged all make my chips get very hot fast.
Anyone know where I can get suitable cores in the UK cheaply? They need to be able to work at 20-100khz.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
EVR's offer really can't be beat. But since you asked for UK sources: I think I used similar Fair-Rite cores, but I got mine from RS because they had UK stock.
Fair-Rite make lots of different ferrite grades. 77 and 78 are what we mostly use for GDTs and feedback/protection CTs.
Maplin also sell ferrite rings in their CB radio department. I've no idea what material these are made of, but if you've got a Maplin nearby, they might be worth a try.
I do know that if you're salvaging cores from equipment, the yellow/white and green/blue ones are common, but useless for GDTs. They're iron powder, not ferrite.
Registered Member #3943
Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
@EastVoltResearch I sent you a PM ( :
@Steve Conner Thanks. The cores were out of a couple of old TV's/monitors that I used for parts awhile ago. They had no colouring/ just plain ferrite. None of them seem to be well suited since they make my chips get hot (I even had a UCC37322 explode as soon as I connected power!).
I have read up lots online about winding your own GDT's and have followed all the advice in using tri-filier windings to reduce leakage inductance but it all seems to point to the core being the problem. I should be getting that scope soon so I will be able to check things like this and make sure waveforms are relatively decent rather than just waiting until something gets hot.
I did check maplins but the problem, like you said, you just don't know what you are getting as there are no datasheets.
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
hmm, ive been after some GDT cores, what ones would be the best out of the ones ive narrowed down? ,%
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=4294955962
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Alex,
Got your PM. Just contact me at my email address i sent you with your shipping info. I don't check this forum or PMs here that much, so contacting me via email is best.
Registered Member #3943
Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
EastVoltResearch wrote ...
Alex,
Got your PM. Just contact me at my email address i sent you with your shipping info. I don't check this forum or PMs here that much, so contacting me via email is best.
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Where to get suitable ferrite beads for gate drive transformers in the UK?
But since you asked for UK sources: I think I used similar Fair-Rite cores, but I got mine from RS because they had UK stock. 