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Help with Flyback driver?

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LAN_403

Platinum

Fri Dec 09 2011, 12:00AM

Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525

I tried 12v on it, didn't work very low output, no flyback output what so ever.

I made arcs from a CRT, look at my thread, there is a video. but it shuts off after every prolonged pulling of an arc.

Marko

Fri Dec 09 2011, 02:55AM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

Platinum wrote ...

I tried 12v on it, didn't work very low output, no flyback output what so ever.

I made arcs from a CRT, look at my thread, there is a video. but it shuts off after every prolonged pulling of an arc.

Hm, I have too hard time believing it only refuses to work for you because it hates you. 90% people building this for the first time do errors like placing the diodes wrongly (from gate to emitter of the same transistor or using a wrong core material for the inductor (although this often works anyway!).

Another common error is wrong phasing of the primary coils.

Finally you must make sure you're not using a dead transformer or that it hasn't died while you were cooking it with output of an SMPS.

If you could take a picture of your setup, it would help as all far more than 3 pages of rants :)

Marko

Platinum

Fri Dec 09 2011, 03:31AM

Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525

All I was trying to do was use a HOT in a single transistor flyback driver.

Patrick

Fri Dec 09 2011, 03:45AM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

Platinum wrote ...

All I was trying to do was use a HOT in a single transistor flyback driver.

I am really confused! what is the purpose of this thread? I thought you wanted help making a SMPS for your existing transformers.

But then you say your buying one, then you say your trying to use Horzontal output trransistors. what specifically do you need from those of us here on the forum?

Platinum wrote ...

I know that circuit is not ZVS, but could I make a ZVS with this circuit, or could I make a different circuit which only uses one MOSFET.

Platinum wrote ...

I mainly want a reliable flyback driver, I've powered flybacks from CFL ballasts, SMPS from PC's and other things, from small PSU's from router, phones, chargers, but never any of them were good.

Platinum

Fri Dec 09 2011, 03:47AM

Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525

Close thread.

Patrick

Fri Dec 09 2011, 03:51AM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

Platinum wrote ...

Close thread.

Wait! why? im confused, what are your needs in this area?

As near as i can tell, you should:

-Abandon the use of HOT's, use a real MOSFET or IGBT type. (i have my favorites, but their not for ZVS)
-dont bother using anything but the flyback from your salvaged TV's
-buy real components from an online source, even if its from a foriegn country, the US or any other.

Yes the components in TV's are often free and often useful, for this project your limiting yourself too much, to crap that doesnt matter.

lets see if you can get a bag full of the peices you need, at low cost. then we'll be able to advise you on how to assemble known good components with a known good circuit, then we can stop chasing a tail.

As for your power supply, im thinking about that one too.

EDIT: i see your in the UK, you can definatly get the parts you need, without to much cost.

Platinum

Fri Dec 09 2011, 01:49PM

Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525

Thank you, I'm sorry I go off the handle sometimes, so I'm getting the ZVS.

Platinum

Sun Dec 11 2011, 07:36PM

Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525

Yeah, but I was trying to use HOT's for the time being.

Marko

Sun Dec 11 2011, 08:07PM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

Hi platinum

Well, the proper way to use hot's would be to start from this schematic:

and then modify it to work with a HOT instead of a mosfet. I don't think anyone has done that though so you would be left to go through TV schematics or application notes in order to find out how to drive a HOT properly. Drive circuitry for HOT's is much more complex than for mosfets or igbt's, you'd likely require a pulse transformer driven by a mosfet in order to get several amps of the drive current required.

I didn't think you'd like this idea since you didn't seem to be capable of attaining the components required and designing the drive circuit yourself.

Marko

Platinum

Sun Dec 11 2011, 09:41PM

Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525

Yep bin that :)

I have 2 400v 10A transistors, is the voltage to high to be used a single transistor flyback driver?

Never mind the two transistor I got from a SMPS are actually commonly use in flyback driver.

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