Re: What should happen AFTER charging?

[Bruce Nordman <bnordman@xxxxxxx>]

"charger or power supply" is a key question.
That distinction triggers different treatment in energy regulation.
After much discussion (which I was not part of), the conclusion was
that a battery charging system is one in which the power supplying
device has the charge control circuitry.  When the charge control
circuitry is in the charged device (which could be only a battery or
a device containing a battery), then the supply is just a power supply.
By this criterion, I think a UPAMD adapter is always a power supply.

I suspect a) has some uses, but I think b) will be the dominant usage model.
Power burden for maintaining the communication link should be kept to a
minimum.  The device may request more power at any time, whether for
recharging or for just use (to not deplete the battery).  Could be useful to
have a timer so the adapter attempts repowering/recharging after an interval
so that the device doesn't need to do this.

While not part of the normative standard, I think it worth informatively
discussing how to present the different system states to users in terms and
indicator lights, for those systems that choose to do so.

--Bruce

On Tue, Sep 7, 2010 at 2:04 AM, Piotr Karocki <pkar@xxxxxxxx> wrote:

What is scenario after device is charged?
Device send message "please stop powering me", waits for ACK, and?

a) communication ceased; no more power; owner should disconnect device
b) communication is active, in mean of "keep alive" messages, and after some time (e.g. day or hour) device could request recharging

In another words, UPAMD adapter should be treated as charger or as power supply?


--
Piotr Karocki

-- 
Bruce Nordman
Lawrence Berkeley National Laboratory
eetd.lbl.gov/ea/nordman
BNordman@xxxxxxx
510-486-7089