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Sold/Expired Sales Thread: USB Micro Charger for Li-Ion/Poly Cells

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Re: Feeler: USB Micro Charger for Li-Ion/Poly Cells

wapkil said:
An interesting thing about this charger is that one can charge a Li-Ion from 4 NiMHs (or alkalines, lithiums, etc. - anything between ~0.9V and 1.75V) with it. There are boxes that take 4 AAs, connect them in series and pretend to be an USB power source. I think they should work well with this charger.
Click to expand...

Ohh, It would 🙂
 
Re: Feeler: USB Micro Charger for Li-Ion/Poly Cells

Sabrewolf said:
Ohh, It would 🙂
Click to expand...

To be clear, I was writing about "dumb" 4AA boxes, without any circuit inside. With NiMHs they soon fall below the USB voltage, with anything else they can be above the USB voltage. They are cheap, it's not safe to use them with USB devices but they would work well with this charger. Just an idea for travelers 🙂
 
Re: Feeler: USB Micro Charger for Li-Ion/Poly Cells

Put me on the list please 🙂


Great idea Btw!
 
Re: Feeler: USB Micro Charger for Li-Ion/Poly Cells

wapkil said:
To be clear, I was writing about "dumb" 4AA boxes, without any circuit inside. With NiMHs they soon fall below the USB voltage, with anything else they can be above the USB voltage. They are cheap, it's not safe to use them with USB devices but they would work well with this charger. Just an idea for travelers 🙂
Click to expand...

Ohh, I know what ya meant :grin2:
 
Re: Feeler: USB Micro Charger for Li-Ion/Poly Cells

donn_ said:
I'd be in for one if it was offered in a 'goosed' version. 300mA is too slow for me.
Click to expand...

I think going much higher may be impossible with a linear charger in such a small case. When I was testing another linear charger, it was working correctly without cooling at 400mA but was overheating at 600mA. These ICs usually have thermal regulation that lowers the current when they overheat but it defeats the purpose of using higher currents. A switching charger IC could work but I couldn't find any in a solderable package.

EDIT: Actually the small case is not the most important problem. It could work if there was a good thermal path to it. Anyway I think it would be complicated to design a good, small, high current charger with a linear IC.

BTW, Sabrewolf - do I understand correctly that you plan to cover all the insides in Norland? I couldn't find its thermal conductivity, I hope it doesn't act as an insulator...
 
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Re: Feeler: USB Micro Charger for Li-Ion/Poly Cells

wapkil said:
I think going much higher may be impossible with a linear charger in such a small case. When I was testing another linear charger, it was working correctly without cooling at 400mA but was overheating at 600mA. These ICs usually have thermal regulation that lowers the current when they overheat but it defeats the purpose of using higher currents. A switching charger IC could work but I couldn't find any in a solderable package.

EDIT: Actually the small case is not the most important problem. It could work if there was a good thermal path to it. Anyway I think it would be complicated to design a good, small, high current charger with a linear IC.

BTW, Sabrewolf - do I understand correctly that you plan to cover all the insides in Norland? I couldn't find its thermal conductivity, I hope it doesn't act as an insulator...
Click to expand...

I will be using Arctic Ceramic epoxy instead 🙂
That means the entire case will be a heatsink :thumbsup:
 
Re: Feeler: USB Micro Charger for Li-Ion/Poly Cells

Illum said:
the thing is, the DSD charger is being fed by a 5.5VDC 450ma wallwort, I was referring to the big o'fat PCB board in the charging cradle...
I can understand it if there's an AC-DC conversion to work with but dood...its being fed with DC:ohgeez:

well okay, its not as fat as it sounds but it does have alot more components than a single IC...
[not my pic]
Click to expand...
I could see all that in a usb plug...
and the component sabrewolf uses are probably more pricey, and smaller.
 
Re: Feeler: USB Micro Charger for Li-Ion/Poly Cells

Edwood said:
Robert.

I guess I missed the first batch?

Please put me on your list for the next batch. I posted interest in one here:

http://www.candlepowerforums.com/vb/showpost.php?p=3060412&postcount=45

This little charger will be perfect for charging those loose little Li-poly battery packs I have lying around.

-Ed
Click to expand...

Naw, I will make a bigger batch, Within reason..
Well, I do have my limits as to how many things
i can build at once. But that is just the "Interest" list..
The orders will be shipped out according to the "Paid" list 🙂
 
What about a dual head option, one for 100 mA charge and one for 300 mA charge. I would prefer to carry one cable instead of two. Is this possible?
 
RocketTomato said:
What about a dual head option, one for 100 mA charge and one for 300 mA charge. I would prefer to carry one cable instead of two. Is this possible?
Click to expand...

It would require a switch to swap the 100/300mA inputs
to the chip to pull it off.. And i haven't found a switch that
is small enough to shove inside the body. There is literally
no room in there for any extra components 🙁

I wish it was as simple as adding an extra clip lead to the chip :mecry:
 
Can you put a second head in series with the first one? One wired for 100 mA and the second wired for 300 mA. If you plug them both into two different ports then you could get a 400 mA charge.
 
RocketTomato said:
Can you put a second head in series with the first one? One wired for 100 mA and the second wired for 300 mA. If you plug them both into two different ports then you could get a 400 mA charge.
Click to expand...

I couldnt stuff 2 seperate charging IC's inside 🙁
 
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