Possibility for low cost voltage setting
I would still like to propose to keep
the possibility open for simple low-cost solutions.
Which means for example a simple analogue
level of the communications connection in order to set the required voltage
of the load; any digital signal on that communications connection would
overrule the analogue signal. This will of course not be possible if we
choose to use a communication scheme over the power lines.
General power adapters have a controller
on the primary side, which uses a feedback signal from the secondary (DC)
side to adjust its operation level. Mandating digital communications on
the secondary side would mean an additional controller on this secondary
side, with additional requirements of operating voltage (supplied by the
adapter itself) and control components.
I believe the impact of this is just
too large for general manufacturers to justify; unless the requirements
become mandatory by governments.
(+70% cost for a 20W adapter; +40% for
a 60W and about 25% for a 100W adapter)
Since I do not believe that standard
commodity products will come available with a double power connection,
I believe this has a major impact to the success of the UPAMD.
This will also allow for a transition
period, where mobile device manufacturers will learn to appreciate our
efforts and where costs of cabling and connectors will be reduced due to
large scale usage.
It does not have to interfere with or
restrain anything that we are trying to achieve; it can just be an additional
requirement.
Best regards,
Rene