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Forums
4hv.org :: Forums :: High Voltage
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Triple Flyback Stack advice wanted

 1 2
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Signification
Fri Sept 11 2015, 03:01AM
Signification Registered Member #54278 Joined: Sat Jan 17 2015, 04:42AM
Location: Amite, La.
Posts: 367
 		Can you arrange -four- flybacks in a sort of back-to-back usable configuration with some common primary windings between 'pairs' of xfmrs?
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Kiwihvguy
Tue Sept 15 2015, 12:08AM
Kiwihvguy Registered Member #3395 Joined: Thu Nov 04 2010, 08:42AM
Location: Christchurch, New Zealand
Posts: 193
 		Hi everyone,

Have been experiencing some problems with fake IGBTs and multiple failures so this is on hold for the moment, but testing and construction should resume within the next few months. I just have to ensure I have genuine IGBTs and i will be redesigning the layout to be more professional.

Thanks for the advice so far. You can see my post about fake IGBTs in the general chatting section if you're curious
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paris
Mon Sept 21 2015, 10:09AM
paris Registered Member #3042 Joined: Wed Jul 28 2010, 12:36AM
Location:
Posts: 121
 		where ya get fake stuff from? just curious , Im about to launch into spending spree
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Kiwihvguy
Tue Oct 20 2015, 11:30PM
Kiwihvguy Registered Member #3395 Joined: Thu Nov 04 2010, 08:42AM
Location: Christchurch, New Zealand
Posts: 193
 		Hi paris,

Pretty much most sellers on ebay won't be selling genuine IGBTs. I bought mine from a seller who was based in China, though they could come from anywhere.

The non-genuine ones are much much cheaper, but their current and/or voltage ratings are lower. It's more worthwhile to invest in genuine components from places like element14 or Digikey.

Who knows, perhaps all of my ZVS problems have been caused by non-genuine IGBTs over the last few years!
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paris
Thu Oct 22 2015, 01:42AM
paris Registered Member #3042 Joined: Wed Jul 28 2010, 12:36AM
Location:
Posts: 121
 		mate wish ya posted a tad sooner ;0) yea Ive recieved some stuff from china now , looovvee the prices , will see what gives
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Justin
Thu Oct 22 2015, 01:53AM
Justin Registered Member #46164 Joined: Wed May 07 2014, 08:16AM
Location: California, USA
Posts: 89
 		I'd recommend checking all of the parts you get from china before using them. I just received 50 "genuine new" IGBTs from china and 7 so far are dead on arrival and many of them look to be rejects or fakes.
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paris
Thu Oct 22 2015, 02:27AM
paris Registered Member #3042 Joined: Wed Jul 28 2010, 12:36AM
Location:
Posts: 121
Ive only got hyper fast diodes and TVS diodes .....which might be square housed IN4001 but Im optimistic / gullable
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Erlend^SE
Thu Oct 22 2015, 03:03PM
Erlend^SE Registered Member #1565 Joined: Wed Jun 25 2008, 09:08PM
Location: Norway
Posts: 159
 		What is the intended use of the whole construction?

For arcs you may want to parallel them for more current.
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Kiwihvguy
Mon Nov 02 2015, 09:12AM
Kiwihvguy Registered Member #3395 Joined: Thu Nov 04 2010, 08:42AM
Location: Christchurch, New Zealand
Posts: 193
 		Erlend, yes the flybacks are currently configured in parallel for a higher current output. A higher voltage by configuring them in series would be much more effective to get a bigger arc due to the bigger spark jumping distance, but the voltage stresses would be large, to engineer a safe system would be more complicated, risky etc

Just for arcing really. It's a wonderful pastime!

So far a friend of mine has bought some IRG7PH42U IBGTs from element14 (1200V 90A) and I intend to build a new circuit specifically for this triple flyback stack, especially with genuine trustworthy parts and not unreliable "fakes".

At the moment, this current ZVS is using some old IRFP250s which handle 36VDC in fine, but I'm not sure about 48V as I don't want blow my last pair of reliable transistors.
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