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Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
I made a flyback driver a while back with an old cheapy ATX PSU, that was around 380W~ (12v x 32a), and with other ferrite cored SMPS's. While this gave pretty powerful flyback arcs they would not last more than 5 minutes, the problem was HV coming back into the powersupply, how do I stop this from hapening, then if I'm correct this will be a good way to power a flyback for HV.
To power the flyback you directly solder wires on the secondary part of the transformer inside the PSU, this is unrectified, unregulated HFAC. I assume.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
EDIT: This post is incorrect. I've posted again further down the thread,
(Hi Platinum, my guess is that you need to put a resistor in series with the arc. I don't think it's a problem of HV getting back into the power supply, but more a problem created by by-passing the the regulator circuitry in the power supply, and drawing too much current.
This is fine for a couple of minutes, until the 'fets (or whatever) overheat.
This is just a guess though, others may have other suggestions.)
Registered Member #4074
Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335
Would this be similar to powering a flyback off the HF output of a low voltage halogen PSU? I tried this when I removed an old HF halogen transformer from the ceiling, but at 24VA input I didn't get anything but the faintest spark from a variety of flybacks. Even when I held both the output lead and ground in my hand I couldn't feel any current flow. I guess it was putting out about 1000v at a few uA.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Platinum wrote ...
In series with the arc? What resistor should I use? I'm not sure if I even have some resistors anymore.
Hang on....I should remember not to post after drinking.
There are two issues here, I think. If you add a resistor to restrict current from the power supply, place it in series with the primary of the flyback. I assume you are by-passing the regulator circuit in the power supply.
The other issue could be voltage spikes from the flyback primary getting back to the secondary of the PSU, causing voltage spikes in the primary of the PSU and driver circuit.
You'll need a 'scope to check for voltage spikes in the primary circuit of the PSU, but you can check the current in the flyback primary with an ammeter.
If it is voltage spikes a snubber circuit should sort it out, if it's drawing too much current a resistor in series with the flyback primary should sort it out.
Sorry about the confusion,it was late last night when I posted.
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
I think I'm going to buy two GF 250Watt 12v halogen PS (and series the outputs) and go very easy on the primary turns on the flyback. I'm unsure what type of circuit these halogen PS's use but in the 100watt you have two 13009 transistor if I remember correctly andf the 250watt has 4 of them. The circuit is infact simple.
I've probably already asked this but is there any weird way to get HV arcs? Except CFL, do all laptop's have CCFL inverters? Would I be able to make an arc with this, or could I buy something cheap-ish (£30~) to make some arcs? (I will also buy halogen supply) I have flybacks and ignition coils..
Registered Member #4074
Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335
Let me know if you have any success with those halogen drivers, I was never able to get any decent output. IIRC the output of the halogen PSUs need a resistor in series with the primary of the flyback, and they will also need either a high power resistor or a halogen lamp across the 12V output to provide a stable load, otherwise you may damage the power supply.
EDIT: Mikes Electric Stuff on youtube has a demonstration of a halogen power supply being used to drive a flyback: youtube link
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
XravenorX wrote ...
Let me know if you have any success with those halogen drivers, I was never able to get any decent output. IIRC the output of the halogen PSUs need a resistor in series with the primary of the flyback, and they will also need either a high power resistor or a halogen lamp across the 12V output to provide a stable load, otherwise you may damage the power supply.
EDIT: Mikes Electric Stuff on youtube has a demonstration of a halogen power supply being used to drive a flyback: youtube link
I have had success with them before. But I always used to use like 3 turns on the flyback's primary as I was stupid, use atleast 6. Even then I think it'll run for a limited period of time, so I'd use 10-15. To have a better output you could always series two transformers.
This thread maybe able to show you something...
Also this website sells high power halogen power supplies, as well as the domestic 250watt ones (It seems that 250w is the highest you can buy, but this website sells alot more high power ones)
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