26-04-2012, 01:50 PM
Not sure how you're getting there, Al. Indeed, I'm not entirely sure how it's going to work at all, as the primary is not being driven at all well. I assume it's a 50Hz transformer...
OK, when Q3 saturates, there is 6V DC across the primary. But what happens when it switches off? Presumably C3 is meant to resonate with the inductance of the primary? If not, I can't see where the flux goes. Perhaps it's being used as a flyback converter? In which case, you'd only need half-wave rectification on the secondary. On the other hand, if there was another power transistor, driven from Q1, and a centre-tapped primary, then I might be happy.
Without building one and experimenting, I'd have to advise caution with this circuit. Certainly it has a low component count, but there are better and more efficient ways of doing it.
OK, when Q3 saturates, there is 6V DC across the primary. But what happens when it switches off? Presumably C3 is meant to resonate with the inductance of the primary? If not, I can't see where the flux goes. Perhaps it's being used as a flyback converter? In which case, you'd only need half-wave rectification on the secondary. On the other hand, if there was another power transistor, driven from Q1, and a centre-tapped primary, then I might be happy.
Without building one and experimenting, I'd have to advise caution with this circuit. Certainly it has a low component count, but there are better and more efficient ways of doing it.
