how can i implement usb charging in a mod

[ffwd]

ok, so pretty much the title says it all, i dropped and broke my nice custom 2x aa batt box mod, so its back to the drawing board. this time i want to implement usb charging into it, along with indicator lights (charging, low batt, charging complete) anyone got an idea on how to do this with a 14500 battery?
thanks
ffwd

 

[Sgood1971]

I have been looking at this thread pretty hard. Towards the end it gets to the good stuff but the whole thing is worth reading.

http://www.e-cigarette-forum.com/forum/battery-mods/41398-best-5v-mini-usb-pass-through.html

 

[Global_Apathy]

spark fun electronics has a max1555 board

 

[Sgood1971]

spark fun electronics has a max1555 board

Got a link?

 

[karmatized]

The issue is you need to control at what point does it stop charging, microchip makes a very small board for charging batteries via usb and you must use a cap to time the charge level by the voltage.

http://www.microchip.com/stellent/g...09~12~en006096~PressReleaseLayout/46643-1.png

 

[Global_Apathy]

The max1555 is a single cell 3.7V LI-po charging circuit. It doesn't need a timer to run. It works off of voltage set points and current.

I can't post links yet have to get my post count up. Search for max1555 and sparkfun in google you should find it.

 

[Sgood1971]

I think this is it SparkFun Electronics - Lithium Ion/Polymer USB Battery Charger IC - MAX1555 Still asleep will have to read it more closely after coffee.

 

[Global_Apathy]

Yes they have the chips too if you want to solder it all urself. With the board it's just a drop in.

 

[Sgood1971]

Told you I was asleep Here is the board I think. SparkFun Electronics - LiPoly Charger - Single Cell 3.7-7V Input wow that thing looks interesting. 4cm x 4cm This is something I will be giving a try very soon.

 

[Sgood1971]

Question though, it says it's li-poly and then the description says "Polymer Lithium Ion" I am sure both of those are interchangeable, but would this work on let's say a 14500?

Obviously I have quite a learning curve to get through, but I'm capable of getting there with a few nudges.

 

[Sgood1971]

Sorry for the multiple posts, but the above board looks like it would pair REAL nice with this SparkFun Electronics - Polymer Lithium Ion Batteries - 2000mAh

 

[misterD]

that pcb with mini usb from sparkfun its gonna come to almost 20 bucks. at this point id order a bartleby.
im waiting on some mini-usb-female-5pin to come from china then i'll try to work on something 1/2 decent...
i screwed up my blue-mod but if i had the switch a lil closer to the top it'd fit ok...

 

[Sgood1971]

The stuff from sparkfun is a little pricey, but the point to me is to build something and if I buy a bartleby I'm not going to get the time working with my hands in. Also, I have limited skills so far and would be a LOT more comfortable just incorporating a prebuilt board into my mod while still getting to solder, etc. and learning a little along the way.

 

[Global_Apathy]

To quote the specification sheet of the chip
"The MAX1551/MAX1555 charge a single-cell lithium-ion
(Li+) battery from both USB* and AC adapter sources.
They operate with no external FETs or diodes, and
accept operating input voltages up to 7V."

Though single cell can be taken as one 3.7V unit as long as the batteries in the cell are the same. Meaning you can use this on parallel batteries with higher capacities just not series batteries. I stumbled across this part whilst searching for a boost converter to charge 9V Li+ via usb. Technically all you need is the chip, a couple smd caps, and a usb female, but the board is a drop in.

 

[Sci]

Take a look here: https://shop.maxim-ic.com/storefront/samplecart.do?event=SampleNow&partnumber=MAX1555EZK+&rownum=0#

Then here: QuickView - MAX1551, MAX1555 SOT23, Dual-Input, USB/AC Adapter, 1-Cell Li+ Battery Chargers

But, 1st, sign up with them so you can get free samples.

 

[misterD]

can you guys please tell me the difference between this, this and the pricey one sparkfun has?

 

[Global_Apathy]

http://cds.linear.com/docs/Datasheet/4062fb.pdf

linear has a couple of choices too

 

[Sci]

can you guys please tell me the difference between this, this and the pricey one sparkfun has?

The 1st this comes out of China, it's cheap & it's going to take a while to get here. The second this is the stock 510 charger. They are trying to see if it will do what the pricey one sparkfun has does. Hope that helped you, I wrote it & I'm not sure about it...

 

[Sci]

http://cds.linear.com/docs/Datasheet/4062fb.pdf

linear has a couple of choices too

Haven't seen that one, thanks. The ones from Maxim are what I've seen/heard about in all of the charging circuits so far.

 

[Global_Apathy]

Mister D, I'm thinking it is the same circuit and I'm thinking that it's made in china, so it's about 1/3 the price after shipping. Now it has a usb male but with a soldering iron and a little messing around that can change.