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Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Uzzors project marathon! When I was a n00b I thought a bigger power supply would give me better sparks, which is true. So I tried to find ways to get more than 12V, and a few years later resulted in this project. I started it a few months ago, but it's taken a while to work out the kinks and make it stable. Theoretically it can pump 750W, but I think 500W is more realistic considering component heating and all. I've tested it with a 10 ohm resistive load and a Mazzilli driver without failures or the voltage so much as flinching. So about 230W so far. I don't have a heavier load available so it's true capabilities are yet unknown. I settled on a simple resistor based over-current detection scheme, which hasn't failed me yet. The overkill double 30CPU04's can take quite a pounding in the event of emergency anyway. A pair of IRFP450s died of overheating, but that was after pulling arcs for a few minutes. It's difficult to cool stuff sufficiently in that stuffed case.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
I think it was from a monitor, but a standard ATX core would work fine. The monitor ones are physically larger, but otherwise similar. At only 45kHz one can easily get away without driver ICs, anything else would just be overkill.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
You can use bucket water with little NaOH as load, you should be able to push as much power you want into it (until it boils). Expect lots of hydrogen to be produced though.
1kW should be about right for two IRFP450's, as long as you are cooling them well enough.
At high output currents I would actually be much more afraid about overheating the diodes than mosfets.
Your components don't look like they are getting much airflow at all - I'd be worried about all the plastic catching fire.
Ferrite transformer and input bridge rectifier will also get pretty hot.
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15 - 48V 16A SMPS
