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Subject: Re[2]: Question to powermgm.c charging algorithm
From: Uwe Freese (mail_at_uwe-freese.de)
Date: 2002-08-08


Hello Nielsen,

Nielsen Linus (ext) wrote on Thursday, August 8, 2002, 12:44:19 PM:

>> positive delta = voltage is going down
>> negative delta = voltage is going up

NLe> What makes you think that?

>> why is the second test (delta <= 5) ? Shouldn't it be (delta
>> >= 5), that means "turn off charging if the voltage
>> went down at least by 0.005" Volts?

NLe> No, i guess it means "stop charging if the voltage doesn't rise that much
NLe> anymore".

>> Does the first check (delta < -50) mean that charging
>> stops if the voltage went up very quickly?

NLe> No, it stops if the voltage drops quickly, a negative-delta detection.

But 0.3 Volts dropping (see powermgm.c comment)? That is not the voltage
drop that marks a complete charging. Thats too much!

I thought that the 0.3 Volts is the value that stops charging when the
battery voltage goes UP (it wouldn't normally).

| now a little more ascii art ;)
|
| +0.3v _----_ -0.005v
| _-/ \-
| _/
| _---/
| ___-------------/
|---/
------------------------------------------------

Bye, Uwe.



Page was last modified "Jan 10 2012" The Rockbox Crew
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