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A friend is revamping a variable output SMPS. The original used
a single 24VAC winding and a 35A conventional bridge. He found
that this bridge became very hot when the full 28V / 8A was being
drawn and so changed to this set-up, which uses "push-pull" windings,
as he calls them. He says that now there's very little heating in the
diodes at full output. He wonders why Schottky diodes aren't used
more often as power rectifiers. Maybe he's not looking around
enough, but a quick glance through RS's catalogue shows that most
if not all of their bridges aren't Schottky (I think). The other question
he has is whether there's something about Schottkys he doesn't
know that makes them unsuitable as power rectifiers, especially
for long-term use, and should he go back (reluctantly) to standard
diodes

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