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A mini PPA v2,my first portable attempt. - Page 6

post #76 of 83
2/11/13 at 7:23am

Have you tested charging the batteries with just that PCB alone?

 

Since it only seems to be a protection PCB not an actual battery management PCB

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post #77 of 83
2/15/13 at 11:57am
Thread Starter 
Have you tested charging the batteries with just that PCB alone?

Since it only seems to be a protection PCB not an actual battery management PCB

I'm not sure that is accurate, I am fairly certain that both battery PCB's that I am using regulate the charge as well as the discharge, however I don't think either of them regulate the charge current. I will need to look at the dada sheets of the controller ICs to be sure.
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post #78 of 83
2/15/13 at 12:09pm
Thread Starter 
Have you tested charging the batteries with just that PCB alone?

Since it only seems to be a protection PCB not an actual battery management PCB

I'm not sure that is accurate, I am fairly certain that both battery PCB's that I am using regulate the charge as well as the discharge, however I don't think either of them regulate the charge current. I will need to look at the dada sheets of the controller ICs to be sure.
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post #79 of 83
2/15/13 at 1:36pm

Two PCB's?

 

The wording for some of the protection PCB's for these batteries can be very misleading

 

example: http://www.ebay.co.uk/itm/PCB-Charger-for-3-Packs-3-7V-Li-ion-Li-Lithium-18650-Battery-Rechargeable-2-3A-/221118857088?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item337bb5ff80

 

"Charger PCB" - Although really this is only a protection PCB

 

Looking through ebay  and various other websites it's pretty much impossible for me to source a charging PCB for an 11.1v pack - only laptop style power bricks which are normally used for higher voltage RC car LIPO battery packs.

 

This is the type of IC which would be suitable for charging such battery packs which you want to use: http://docs-europe.electrocomponents.com/webdocs/10e2/0900766b810e269b.pdf

 

Evaluation kit version of that IC: http://www.maximintegrated.com/datasheet/index.mvp/id/3105

 

 

If for some reason I am completely wrong then please school me about my errors :(


Edited by miniq - 2/15/13 at 2:01pm
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post #80 of 83
3/23/13 at 8:03am

Nice stuff!!  This amp maybe a true worthy competitor to Justin's Pico Power.

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post #81 of 83
3/23/13 at 11:38pm
Thread Starter 
Quote:
Two PCB's?

Yes and no. I am using one type of PCB in one amp, and another type in the other amp.

 

To clarify, Both battery management boards keep the cell pack from over discharging and over charging.

 

I am trying to test both to decide whitch one i prefer, but either one will work fine.

 

I have been away from this project for awhile, I will post an update soon.

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post #82 of 83
3/23/13 at 11:59pm
Thread Starter 

Ok, I have been away for a few weeks, and have not been able to work on this much at all in that time.

frown.gif

 

My job sent me out of state and while i was away I simply did not have any  spare time to work on this.

 

However, I am back now, and shortly I will be caught up on things at the office that piled up while I was away.

 

An update is in order! I have the new PCB designs pretty much done, but I am working on a couple of upgrades to the amp that i want to include in the PCB order to keep costs down.

 

The first is a digital POT that will allow not only volume control, but also allow adjustment of the op-amp and buffer bias settings from a single encoder.

 

The second is a small DC/DC converter board that will allow this amp to be powered from a USB port, and then paired with a small DAC for a neat little desktop amp.

 

Both of these are still early in development, but hopefully they will work on the first try....tongue_smile.gif.

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post #83 of 83
5/8/13 at 8:54am
Any new updates to this awesome project?
I'm for sure interested in a PCB set or two, if there will be some kind of group deal later on smily_headphones1.gif
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