It would make a great deal of sense for them to put all the
intelligent electronics in the base/power station (including the
standby, power switches, remote control receiver, etc) so they can
completely depower the display (and the associated energy loss) during
"standby".

There are other ways they can reduce the standby cost while still
providing the same consumer experience.

-Adam

On Sun, Oct 11, 2009 at 1:34 AM, Russell McMahon <apptechnz@gmail.com> wrot=
e:
>> I have not read the article
>
> Total text was pasted at end of message.
>
>> 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.
>
> They said:
>
> 'Sony Corporation ... highly efficient wireless power transfer system
> ... up to 60 Watts of electrical energy can be transferred over a
> distance of 50cm (at an efficiency of approximately 80%, approximately
> 60% including rectifier).
> ... =A0Sony has also drawn on its years of experience developing high
> radio frequency (RF) technologies ... to create a new rectifier that
> realizes both high speed and high efficiency. The new wireless power
> transfer system combines these technologies to realize transfer
> efficiency of 60%, even when a rectifier is included. ...
>
> ... and enables products such as television sets and mobile PCs to be
> efficiently powered, wirelessly.
> '
>
> >From this we can conclude:
>
> - Independent of the freuqency used the rectifier is fast ("high speed").
>
> - 60% is highly efficint.
>
> - it takes years of RF development experience to produce a rectifier
> that is 75% efficint (60/80)
>
> - 40% energy loss is going to be acceptable to the regulatory
> authorities for dec=3Dvices such as TVs and mobile PCs.
>
>
> No mention was made of any possible health concerns that may be voiced
> if such a system was proposed for widespread domestic use.
> [Note what that sentence says and not what it could easily be
> translated to say.]
>
>
>
> =A0 =A0R
>
>
> .
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