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Rockbox mail archiveSubject: Re: Trickle ChargingRe: Trickle Charging
From: Uwe Freese <mail_at_uwe-freese.de>
Date: Tue, 10 Dec 2002 11:45:43 +0100 Hello Björn, Björn Stenberg wrote on Monday, December 9, 2002, 10:05:40 PM: BS> Being the project Charger Guru, are you planning on adding some type BS> of trickle charging to the code? I hadn't planned it yet, but I can do it if you like. BS> There is currently a problem with charging the Archos overnight. If BS> the batteries get full at 4am, the unit will stay turned on and BS> consume batteries for a number of hours until I wake up and unplug BS> it. Thie is especially a problem if the Deep Discharge option is BS> enabled. BS> Would it be feasible to add a small trickle charge that offsets this BS> so that the batteries remain full in the morning? Before starting to write code, I have some questions about the design. My first thought was: - charger on if voltage < a - charger off if voltage > b (with b a little bit smaller than the max voltage of the last complete charge cycle) But this has a disadvantage: The batteries are not equally full the whole time. It depends on when you plug off the charger if your batteries are completely full or not. So now I think of this: Charging on means charging with ~300 mA, charger off means decharging ~100mA. So start charging at intervals 15 sec (charge) - 45 sec (decharge) (or is this what you call trickle charge?). Check the voltage every minute and adjust the values. E.g. if the voltage is too low, charge 16 s and decharge 44 s. I think this should work very well and keep the batteries full. However, the feature should be configurable (on/off), because this is not good when using the player all the time plugged in. Another possibility is to only enable it when deep discharge is off. Or maybe: - start trickle charge after a complete charge cycle if deep discharge is off - stop trickle charge after 12h, because charging over a long time is not good for the batteries So please comment these ideas. I'll then implement and test it. I think it will be finished at the weekend. Bye, Uwe. Received on 2002-12-10 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |