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

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Thomas W
Sun Aug 07 2011, 11:46AM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
 		how much is pretty cheap for the IGBTs?
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Ash Small
Sun Aug 07 2011, 12:10PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Tom Williamson wrote ...

how much is pretty cheap for the IGBTs?

£6.26 each

Link2

Looks like they're out of stock now, they had plenty last time I checked. I think they are suitable for this application.
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Thomas W
Sun Aug 07 2011, 03:41PM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
 		hmm do we want to wait several months?
or should we get them from mouser?

EDIT:

just looking through my boxes of stuff and i found 4 IGBTs Bricks
from Sulaiman(Thanks!) :D
http://www.datasheetcatalog.org/datasheet/toshiba/1694.pdf
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Ash Small
Sun Aug 07 2011, 05:10PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
 		Mouser has these @ £3.50 each:

Link2

I'm not ready to order any yet, though

EDIT: at 5kW and 340V I think current is only around 15A, but I want a safety factor of around 3 @ 100C. You may have different priorities, though.
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Thomas W
Sun Aug 07 2011, 05:47PM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
 		yh, im gonna try get around 5-7Kw cause my dads bringing up into my room a 32A line with a plug :D
from what i can see i will only need 1 module and thats it :D
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Dr. ISOTOP
Sun Aug 07 2011, 06:38PM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
 		There's a Ebay seller who has rails of surplus HGTG30N60B3D's for $24...as good as you can get for IGBTs, short of buckets of free minibricks.
You'll want two blocks (full-bridge) for best performance if you use those little bricks.
As much as it pains me to say this, the transformer should probably go under oil :(
Also, you _will_ need a soft-switching topology.
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Thomas W
Sun Aug 07 2011, 07:24PM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
 		whats a soft switching topology?

i have no clue on this area of electronics
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Ash Small
Sun Aug 07 2011, 10:08PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Tom Williamson wrote ...

whats a soft switching topology?

Something like this (There are other designs)
1312754909 3414 FT121661 Soft Switched Full Bridge


EDIT: basically, once the capacitor is fully charged, current stops flowing, so you can switch off at zero volts, or 'near' zero volts (ZVS), I think. (I've done some rough calculations, but I don't trust my maths, as I'm a 'newbie'. I came up with 800nF and 50uH, for 5kW @ 25kHz and 340V, using Wikipedia's definition of a Farad, but I doubt this is correct. (My maths, not the definition))
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Dr. ISOTOP
Mon Aug 08 2011, 02:37AM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
 		The simplest one is a series resonant transformer, where a series capacitor on the primary side resonates with the leakage inductance of the transformer.
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Ash Small
Mon Aug 08 2011, 10:02AM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
bwang wrote ...

The simplest one is a series resonant transformer, where a series capacitor on the primary side resonates with the leakage inductance of the transformer.

Correct me if I'm mistaken, but won't the leakage inductance vary with load? A multi-purpose power supply will, at least, require a series inductor as well, and maybe even a more complex design?

EDIT: I've done some research and it seems the leakage inductance remains constant.
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