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Charger NOT EQUAL with Power Suppy

Posted: Wed May 11, 2016 12:25 pm
by LuckyDime
All, who have problems with stopping/restarting LP should think over, that a smart phone charger communicate with the charged device. They act like a 'smart' device too.
They have a charging characteristic with three period:

- bulk charging: maximum voltage/current for charging the battery till 70-80% of its capacity (also known as fast charging).
- absorption charge: optimised fix voltage / decreasing current for charging the battery till 98% of its capacity.
- float charging till 100% of capacity and for regenerate the battery.

Different battery capacity require different charging characteristics, despite there are 'universal' chargers, stongly suggested to use its own charger.

LP is like a PC, its need a "stupid" power supply providing max. 2A.
My guessing is that smart phone/tablet chargers can't handle the dynamic power hungers, and that's why - despite they are quality chargers - can't handle the situations.

Re: Charger NOT EQUAL with Power Suppy

Posted: Thu May 12, 2016 11:03 pm
by tasrock
Is it possible to apply 5V from a real power supply to a pair of pins (Arduino pins maybe?) in order to power the LattePanda instead of using the USB connector? I am having a hard time finding any USB chargers that supply anything higher than the 2A units that I currently have which seem to have issues.

Re: Charger NOT EQUAL with Power Suppy

Posted: Fri May 13, 2016 5:10 am
by LuckyDime
I don't know is it possible to power the LP with GPIO/Arduino pins or not, but I've bought a power supply like this:

http://www.modmypi.com/raspberry-pi/acc ... 2.5a-black

Re: Charger NOT EQUAL with Power Suppy

Posted: Fri May 13, 2016 5:57 am
by Lutz
tasrock wrote:Is it possible to apply 5V from a real power supply to a pair of pins (Arduino pins maybe?) in order to power the LattePanda instead of using the USB connector? I am having a hard time finding any USB chargers that supply anything higher than the 2A units that I currently have which seem to have issues.
Yes, very important question to the team of LattaPanda.
I really need to know this too !! :!: :!:

Re: Charger NOT EQUAL with Power Suppy

Posted: Fri May 13, 2016 1:47 pm
by tasrock
LuckyDime: Thanks for the tip.

Re: Charger NOT EQUAL with Power Suppy

Posted: Fri May 13, 2016 3:07 pm
by LuckyDime
You are welcome :)

Re: Charger NOT EQUAL with Power Suppy

Posted: Sat May 21, 2016 2:34 am
by strawberrymaker
you could just rip an old micro usb cable apart and plug it into the panda, grap a multimeter and test the continuity. but from what ive seen on the panda there wasnt any kind of isolation

Re: Charger NOT EQUAL with Power Suppy

Posted: Sat May 21, 2016 4:19 pm
by strawberrymaker
Or i would guess that you can use that little 4 pin header named CN2 for powering.

Re: Charger NOT EQUAL with Power Suppy

Posted: Sun May 22, 2016 2:15 pm
by acasta
LuckyDime wrote: (...)
LP is like a PC, its need a "stupid" power supply providing max. 2A.
(...)
There is also another solution out there: UBS charging cables like this one have a hard-wired "please-provide-max-current" signal inside.

So, with cables like this, you can use a "smart charger" as LP power supply.

Further more, this cable has the big advantages of being short and having thick wires, meaning that the voltage drop on the cable is low, leaving all the power to your LP.


-ac

Re: Charger NOT EQUAL with Power Suppy

Posted: Sun May 22, 2016 3:58 pm
by strawberrymaker
About the 5V Pin idea:
I have tested it, they are all connected together. so you can use anything to power the panda via any 5V Port, but use a thick enough cable and enough pins for it (~3 Power Pins) :D