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Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
Sorry to make a new thread but I'm happy as I completed the driver. All I did to make this was solder outputs of the un rectified PSU output (12v 32A) and those wires come through the PSU casing and go to a wire connector.
Here is a video of the output. If I had to estimate the arc goes 4"+
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
One problem is that, the flyback arc is not as high current anymore, is there any reason for this? the voltage is very high but the current has dropper.
And it seems that the flyback likes a big air gap in it's ferrite.
I think I know what caused the current to drop, the HV from the flyback came back into the circuit and some resistors on the surface and maybe more stuff has overvolted and fried, how do I stop HV coming back into the circuit?
basically you are feeding a square wave into the transformer. This is the same as using a push/pull or half bridge or full bridge driver. The low current is probably because of the low duty cycle. the psu is probably trying to regulate the voltage, and since there is not much power consumed from the rectified 12V side it is running at low duty cycle.
Moral of the story, a full bridge is (one of) the best transformer driver. Learn how to make your own bull bridge driver so you can have it run at whatever duty cycle you want.
Registered Member #3943
Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
Dude that was amazing!
Hopefully the PSU was not an expensive one. Might I suggest lead acid battery's for powering things like this, they can take some abuse and are not very expensive if you go to the right place's to buy them.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Alex1M6 wrote ...
Dude that was amazing!
Hopefully the PSU was not an expensive one. Might I suggest lead acid battery's for powering things like this, they can take some abuse and are not very expensive if you go to the right place's to buy them.
Lead acid batteries wouldn't work here if I've read the thread correctly.
All Platinum has done is by-passed the rectifier on the PSU output, and fed the un-rectified PSU output straight into a flyback, if I understand this correctly. (possibly with a series capacitor as well)
(at least, that's what I think he has done, I'm going to have to try this myself)
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
Ash Small wrote ...
Alex1M6 wrote ...
Dude that was amazing!
Hopefully the PSU was not an expensive one. Might I suggest lead acid battery's for powering things like this, they can take some abuse and are not very expensive if you go to the right place's to buy them.
Lead acid batteries wouldn't work here if I've read the thread correctly.
All Platinum has done is by-passed the rectifier on the PSU output, and fed the un-rectified PSU output straight into a flyback, if I understand this correctly. (possibly with a series capacitor as well)
(at least, that's what I think he has done, I'm going to have to try this myself)
You are exactly correct, I had the PSU from a old 60GB PlayStation3, I just used a multimeter and checked the voltages on the secondary and directly soldered two wires on the output, and then fed that High Frequency into the flyback.
I've also done this with PC SMPS's, even wallworts like router PSU's, chargers, anything using ferrite cores. I couldn't stop the High Voltage coming back onto the circuit and some resistors got fried, and output dropper badly then nothing. In future how do I stop HV coming back to the circuit?
You can't power this off batteries because it's a very complex circuit inside, it uses mains.
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
You could probably try to add a filter of some sort, a snubber. (they block and prevent voltage spikes)
It can consist of a few different things. The easiest is just a resistor and a capacitor.
Two zener diode and resistors would work too, just connect them in antiseries across the primary wires. (cathodes both facing outwards across the primary leads) You just need to get zener diodes that are higher voltage than the square wave you're feeding your flyback.
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PS3 400W PSU flyback driver.
