Re: Suggestions for 1kW, unregulated SMPS

Paul Mathews wrote:

2) Full-bridge output SMPS poses extra challenges keeping DC out of the
transformer. Be careful, or use a series capacitor right from the
start. Don't believe the app notes that say that current mode control
prevents DC imbalance (flux walking). That promise is only realized
under controlled conditions.

Yeah, I can't imagine a current trip being fast enough to limit the
inrush into what's practically a sudden dead short.

3) Push-pull topology requires a larger transformer, but circuit is
less complex.

That's why I wanto to go PP.

4) There is much literature available on gate drivers. For a project
like yours, simply choose one of the many good integrated gate drivers.

5) The most important design element is layout. Study SMPS layout
carefully. Where di/dt is high, no inductance is too small to be
ignored. Where dv/dt is high, same is true for capacitance.

Sure. I've been reading quite a lot on the subject, out of interest,
and that's what actually got me started on this idea. This is one
of the rare opportunities where it makes sense to design a custom
SMPS, and a simple one to boot.

--Daniel
.