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4hv.org :: Forums :: High Voltage
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Help with Flyback driver?

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Platinum
Thu Dec 01 2011, 12:31PM Print
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
 		I have two of these

Link2

And two of these

Link2

Is there anyway I can make a driver out of these? can they be used in a ZVS, and could I use one MOSFET of it own?

They were taken from the PS3 PSU, and assumed still working, not sure about 21n50c3's though.

Thanks. Something like this

Link2

But I think a 9V battery will be a bad PS,
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Alex M
Thu Dec 01 2011, 01:23PM
Alex M Registered Member #3943 Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
 		You would need more components than that, also that circuit is not ZVS.
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Platinum
Thu Dec 01 2011, 01:34PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
 		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.
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Inducktion
Thu Dec 01 2011, 03:33PM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
 		If you use two of the same mosfets, you CAN make a ZVS driver. You'll need two ultrafast diodes, two 10k ohm resistors, two 470 ohm resistors (they need to be around 2 watts), 2 12 to 18 volt zener diodes (anywhere in there will work) and a toroid.
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Marko
Thu Dec 01 2011, 04:02PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
 		Try this:

Link2
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Platinum
Thu Dec 01 2011, 04:14PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
 		Dr. Pork I do not have these parts :(

I do not have some of the resistors for the ZVS, but I do have the zeners and the diodes I have 2 15K resistors, I have loads of inductors.


I also only have a 19V 3.25A PSU.
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Marko
Thu Dec 01 2011, 06:08PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
 		If you keep insisting on building projects using parts you can get from a broken TV, you'll end up with frustration only! You need SG3525, a few resistors, diodes and a GDT (there might likely be one in the PS3 PSU). You can use a TL494 too, which you can pull from an old PC PSU, but you need to amplify it's outputs useng bjt totem poles. I think Uzzors or someone had a schematic around.
.
High voltage devices you have likely won't work for "ZVS" driver, though some IRFP260's or IRFP150's should work well enough. Hard to find a circuit simpler than that.

Marko
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Platinum
Thu Dec 01 2011, 07:07PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
 		Damn.

Why can't you use a single MOSFET to drive a flyback?
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Platinum
Fri Dec 02 2011, 12:49AM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
 		Although I've wanted yo use the transistor out of a TV t switch a flyback I just opened a very large colour TV intending to make a oscilloscope, but it's protected against removing the defection coils. So I thought discharge CRT, snip of flyback output and see some arcs, here is a video!

Link2

Excuse my messy bench, I clean it everyday but it's back to square one the amount of stuff I take apart and do lol. IRL the arcs look bigger.

When you pull to much current the TV shuts off for about 6 seconds, :(

O wonder if I could take the board out and run it, but I don;t see why it just don't work (The transistor) on it own, but I have tried them and 12v is not enough maybe mains?

I love flyback, but I still do not have a reliable driver :( I think if I take the driver out it'll cease to work.
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Platinum
Fri Dec 02 2011, 06:08PM
Platinum Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
 		OK, ok sorry for the double post, but I have several high power 1500v transistors, do I use mains to drive them?
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