David said:
What do you really mean by "efficient"?
Seems a bit silly to talk about power efficiency when you have an
"unlimited" current supply available.
Maybe he has a limited cooling budget ;-)
You can buy suitable commercial 12V to 24V converters, that is the
easiest way.
Agree, though I had success in repairing a MOSFET converter
that was inside a 400W subwoofer amp. Some loser had replaced
a blown 50A 60V FET with a 2A 650V one, probably wondered why
it blew again! This thing generates +-22V, which I plan to use
with a power h-bridge to servo a large PM DC gear-motor that
will drive an antenna rotator for radio DF. We'll see...
The sub-woofer had a large "MOSFET" sticker on it, but the
actual amp used BJTs - the converter has the only MOSFETs.