[SHR-Unstable] Forcing fast-charge

Cédric Berger cedric.berger74 at gmail.com
Wed Apr 29 08:58:09 CEST 2009

On Tue, Apr 28, 2009 at 15:36, Joerg Reisenweber <joerg at openmoko.org> wrote:

> That's nonsense as there is no dumb charger out there not being capable of
> supplying 500mA. OTOH any management of maximum ingress current to USB by
> whatever means will inevitably fail when unplugging the charger device
> connected to FR during powerdown and replace it with a (nonexistent) weaker
> one.

I have several car chargers rated 350mA max. (Though I admit pulling 500mA
generally works)
And what if the "charger" is a small usb host device... like a Freerunner ?
Or a solar panel ?
Or you have 2 phone charging from the same usb port ?

I usually charge from a car charger and when I want to charge faster than
500mA from usb (so ~300mA to battery with phone on), I have to push usb
limit to 1A.
But as it is too much for my poor charger, I also limit battery charge
current (ex 500mA).
This way I have about 700-750mA pulled from my charger (though it can peak
to 1A as needed).

Note than doing this (I used a little GUI with 1 set button for each value),
I must set usb current limit, then only I set charge current limit. And in
the meanwhile, since charge limit=usb limit=1A, it starts pulling about 1A
and I cannot avoid that.
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