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Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Tom Williamson wrote ...
im thinking, should we control it off a ICL8038 function generator IC?
I know absolutely nothing about IC's, although I've read elsewhere that the ICL8038 is discontinued, but a few vendors still have some old stock.
Someone on another forum suggested using an AD5932 as a replacement, which is programmable, but others here recommend the TL494, which seems pretty simple to use.
I'm still reading up on ballast inductors and series resonant circuits. I know a bit about parallel resonant circuits, but I've not used series resonance before, but it seems fairly straightforward.
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
yes saddly they are discontinued but i managed to get myself 10 for about £5 on ebay :D
iits very simple to use too, and i have no knowlage of resonance at all its confusing, the AD5932 is a interesting IC but from my POV it looks rather complex to use
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
bwang wrote ...
You'll want to use a TL494, which is specifically meant for this sort of application (SMPS control). After all, all you need is a simple square wave.
I'm inclined to agree with you here, Bwang, although there is an argument for introducing dead-time. The waveforms in the diagram I posted regarding series resonance and 'soft switching' has four different square waves attached. That came from a fairly technical paper, so maybe it warrants 'some' consideration.
Personally, I'm in favour of keeping things as simple as possible (I was hoping to avoid using IC's completely, although it does make sense to use an IC for this application) but it may make sense to use the ICL8038 if it is suitable, and if you have several 'lying around'.
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Winding your own ferrite transformer
