Multi channel battery charger: Difference between revisions
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{{OLPC}} |
{{OLPC}} |
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This page describes a charger for multiple [[Hardware#XO_Laptop|XO Laptop]] batteries. |
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== Introduction == |
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= Multi Channel Battery Charger = |
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Code name "Supercharger" |
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'''See''' [[Product News]] for product availability. |
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== |
== Input Power == |
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* 15 batteries per unit. |
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* Charge batteries in 2 hours |
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* AC (120/240V) and DC operation |
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** DC connector is not yet finalized |
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* Operates at 50 degrees Centigrade ambient temperature |
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* External laptop power DC cables. |
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* 2 cables with XO DC jacks on them |
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** 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. |
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* Bi-Color indicator LED per battery channel |
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** Red Led and Green Led. Same color setup as the XO laptop. Red, Green, and Yellow when both are enabled. |
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* ''Future'' RJ45 10/100 ethernet connection |
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== Electrical Input Requirements == |
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== Electrical Misc == |
== Electrical Misc == |
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* The CPU is an Atmel At91SAM7x family part. |
* The CPU is an Atmel At91SAM7x family part. |
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** See http://www.atmel.com/dyn/products/product_card.asp?part_id=3754 |
** See http://www.atmel.com/dyn/products/product_card.asp?part_id=3754 |
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* The per battery DC-DC charger is a SEPIC design based around a MicroChip MCP1631 part |
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* DB9 for RS-232?? |
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== Software == |
== Software == |
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* will be updated soon |
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* Forth/C combination. |
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* http://dev.laptop.org/git/projects/supercharger |
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* '''Density'''. Getting as many batteries as possible in as small a footprint is a goal. |
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* '''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. |
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* Approximately 2 hours for complete charge |
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** Maximum number of simultaneous charging channels |
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* '''Stackable'''. More vertical space is available than floor sq footage so an idea was to make them stackable. But see above point. |
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*** 15 Batteries on AC |
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*** 10 Batteries via 150W DC source |
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* '''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. |
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*** 8 Batteries via 2 60W solar blankets |
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*** 4 Batteries via 1 60W blanket |
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* '''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. |
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== Datasheets == |
== Datasheets == |
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* [[Image:At91sam7x128_256_pc.pdf]] Atmel CPU |
* [[Image:At91sam7x128_256_pc.pdf]] Atmel CPU |
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* [[Image:DS2756.pdf|DS2756]] DS2756 |
* [[Image:DS2756.pdf|DS2756]] DS2756 |
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* 30A connector |
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[[Category:Peripherals]] |
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Latest revision as of 08:49, 14 March 2011
This page is monitored by the OLPC team.
This page describes a charger for multiple XO Laptop batteries.
Introduction
Code name "Supercharger"
Input Power
- AC Power 100V-230V. 300W
- DC 10V-28V. 150W
Exterior Connections
- AC In: IEC for 120/220VAC
- DC In: 10VDC to 28VDC 2 Pin connector that mates with whats on the GP solar blanket.
- DC connector is not yet finalized
- 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.
- The per battery DC-DC charger is a SEPIC design based around a MicroChip MCP1631 part
Software
- Forth/C combination.
- http://dev.laptop.org/git/projects/supercharger
Function
- Approximately 2 hours for complete charge
- Maximum number of simultaneous charging channels
- 15 Batteries on AC
- 10 Batteries via 150W DC source
- 8 Batteries via 2 60W solar blankets
- 4 Batteries via 1 60W blanket
- Maximum number of simultaneous charging channels
Datasheets
- File:At91sam7x128 256 pc.pdf Atmel CPU
- File:DS2756.pdf DS2756