Multi channel battery charger: Difference between revisions
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* DB9 for RS-232?? |
* DB9 for RS-232?? |
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* USB B connector (Its a USB device) |
* USB B connector (Its a USB device) |
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* 2 cables with XO DC jacks on them |
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== Electrical Misc == |
== Electrical Misc == |
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Revision as of 08:51, 10 February 2008
This page is monitored by the OLPC team.
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NOTE: The contents of this page are not set in stone, and are subject to change! This page is a draft in active flux ... |
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Multi Channel Battery Charger
See Product News for product availability.
Specifications and Features
- 15 batteries per unit.
- Charge batteries in 2 hours
- AC (120/240V) and DC operation
- Operates at 50 degrees Centigrade ambient temperature
- External laptop power DC cables.
- 2 of the XO DC power cables available to the kids so they they can power their laptops while they switch batteries. This keeps them from having to turn off the laptops to switch batteries.
- Bi-Color indicator LED per battery channel
- Red Led and Green Led. Same color setup as the XO laptop. Red, Green, and Yellow when both are enabled.
Future
- RJ45 10/100 ethernet connection
Electrical Input Requirements
- AC Power 100V-230V. 300W
- DC 12V-30V. 150W
Exterior Connections
- AC In: IEC for 120 to 220VAC
- DC In: 12VDC to 30VDC 2 Pin connector that mates with whats on the GP solar blanket.
- DB9 for RS-232??
- USB B connector (Its a USB device)
- 2 cables with XO DC jacks on them
Electrical Misc
- The CPU is an Atmel At91SAM7x family part.
Software
- will be updated soon
Mechanical
- Density. Getting as many batteries as possible in as small a footprint is a goal.
- Physical Safety. Its got to be stable and hold lots of heavy batteries but not be able to fall over on top of a child. Who might be trying to climb on it to get his battery.
- Stackable. More vertical space is available than floor sq footage so an idea was to make them stackable. But see above point.
- Heat dissipation. Each battery needs 15W worst case and most of that power will be dissipated into the batery. I expect the electronics/battery to dissipate less than 1W/battery. PSU at 300W @ 85% efficiency is 45W.
- Enclosure. Metal. Except perhaps for some plastic for the battery holder. Having metal available to heatsink to should help in keeping the electronics from burning up in hot countries.
Datasheets
- File:At91sam7x128 256 pc.pdf Atmel CPU
- File:DS2756.pdf DS2756