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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* Operate at 50 degrees Centigrade ambient temperature |
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== Electrical Input Requirements == |
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** DC connector is not yet finalized |
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* 2 cables with XO DC jacks on them |
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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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* Two indicator lights per battery channel |
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** Red Led and Green Led. Use the same setup as in the laptop. Red, Green, and Yellow both are enabled. |
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switch batteries. |
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* ''Future'' RJ45 10/100 ethernet connection |
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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