Hi Russell,

I have not read the article so this is a guess: I would think that
they are using a relatively high frequency (100s of KHz?) and that
making an efficient rectifier for those frequencies is difficult. A
passive diode would have voltage drop, on resistance, capacitance, and
possibly reverse-recovery to deal with. An active device could be much
better, but there would still be some power needed to run the control
circuit and to charge the FET gates each cycle.

Sean


On Sat, Oct 10, 2009 at 10:28 PM, Russell McMahon <apptechnz@gmail.com> wro=
te:
> I would have thought that the power transfer efficincy could have been
> substantially higher, and the loss levels attributed to rectifcation
> are bizarre.
>
>
> =A0 =A0 =A0 =A0Russell
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