I have had a few questions and requests for additional documentation regarding my next powder coating machine build.
I have drawn up some proper schematics of the powder coating controller including the subsections for variable HV supply.
The full controller schematic is here:
You'll notice I just specified 28VDC input; its really up to you how to obtain this; you can get cheap switching modules off ebay; laptop power supplies, or you can build your own power supply with a transformer and rectifier (My preference as its most robust option). I didn't go into it here as its pretty standard stuff
I have also done a schematic and board for just the HV supply; again its just a simple switching power supply which drives the flyback transformer. There are other popular flyback drivers which use the resonance of the flyback itself to set the frequency, but I have found the timer based designs easiest to build and having the easiest to obtain parts.
Here is the schematic:
And the board layout:
I'm going to have boards made for this driver; If you're interested I'll be selling them for $10 each + $2 shipping (I will just send them as "letter mail"). Let me know via e-mail or comments if you're interested as that will get me motivated to put them up on the store http://www.thegreatgeekery.com/store/
I'm also playing with the idea of moving the flyback (and a HV cascade) onto the gun, I havn't made too much progress in this area, just a box of parts really...