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

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Ash Small
Sun Aug 14 2011, 08:45PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
bwang wrote ...

EBay has some HGTG30N69B3D's at $24.99 for a rail or 30...best price/IGBT I know of right now.

When I 'copy and paste' that part number to Ebay I get 'Your search returned 0 items'

Link2

Am I doing something wrong?
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RickR
Sun Aug 14 2011, 09:17PM
RickR Registered Member #93 Joined: Thu Feb 09 2006, 04:11PM
Location: Houston, Texas
Posts: 64
 		Just Google hgtg. They're still for sale (4:15 pm CDT)

Sorry, brain fart, that should read search eBay for hgtg.

Rick
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Thomas W
Sun Aug 14 2011, 09:23PM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
 		i got a 24v powersupply for this project now as well as a scope
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Ash Small
Tue Aug 16 2011, 11:29AM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
 		Seems I might have run into a stumbling block last night.

I did a fair bit of googling on ZVS and ZCS switching, and the results I got pretty much all said that if you want an H-bridge transformer to work at both heavy and light loading (short circuit and open circuit) you need 'active snubbing' on the output.

This means ,basically, connecting an IGBT to the secondary, at 50kV ???.

Surely there must be an alternative?

(EDIT: A low voltage, actively snubbed, 'third winding', maybe? to compensate for low loads.....Or am I on the 'wrong track'?)
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Thomas W
Tue Aug 16 2011, 06:31PM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
 		connecting it to 50Kv is fine... really all you need is some good resistors :D
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Ash Small
Tue Aug 16 2011, 07:20PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Tom Williamson wrote ...

connecting it to 50Kv is fine... really all you need is some good resistors :D

I'll look into it some more later...I did think about putting 50 in series smile

I'll post links to some of the articles I've been reading, too.
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Dr. ISOTOP
Tue Aug 16 2011, 08:33PM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
 		"Active snubbing" is definitely not essential, considering my transformer works without it.
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Ash Small
Tue Aug 16 2011, 08:40PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
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?
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Aleksandr
Wed Aug 17 2011, 04:56PM
Aleksandr Registered Member #4056 Joined: Wed Aug 17 2011, 12:55PM
Location:
Posts: 1
 		Hello.
Here is mentioned TSC International.
I have ordered in U core ferrite 50ALL in small amounts from them through a site on 04/26/2011.
I have not received anything yet. Only promises to send the next week smile.
Is it the manufacturer or the seller?
Has anybody bought ferrite from them?
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Ash Small
Wed Aug 17 2011, 06:38PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Aleksandr wrote ...

Hello.
Here is mentioned TSC International.
I have ordered in U core ferrite 50ALL in small amounts from them through a site on 04/26/2011.
I have not received anything yet. Only promises to send the next week smile.
Is it the manufacturer or the seller?
Has anybody bought ferrite from them?

I think several here have, and they all complain about lead times, but they all seem to get them eventually.
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