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January 29, 2006Uber Battery for the PSP!
Posted by greg
This was brought to my attention recently in an email sent by Jeff. PSPeeOnYou originally posted in this thread with regard to creating a 100 hour “Uber Battery” for the PSP.
Jeff has also sent us some schematics for a LI-ION battery charger/power supply. Here’s what he had to say:
There seems to be interest in making a really large battery pack for those extended flights to Moscow and Peking. Stringing together the batteries is pretty easy, but how to charge them? And the PSP requires between 5 and 5.5 VDC for its AC adapter port, while lithium batteries are 3.6VDC. You could series two of them to make 7.2 VDC, and then use a linear regulator, but the regulator will get hot and you will lose about 25% of your battery charge to just heat.
Instead, why not make a circuit that will both charge the battery appropriately, and boost the 2.1 to 4.2 VDC native voltage for Li-ion batteries to 5.1 volts? National Semiconductor (www.national.com) makes two chips which will do this quite efficiently. They are the LM3622 and LM2621. The datasheets for these chips are downloadable in pdf format and each has a reference design which will do just about exactly what we need.
The charging stage will take a DC input of 4.5 to 6.5 volts available from the PSP AC adapter. The datasheet has a very complete desription of how the charging chip works: http://cache.national.com/ds/LM/LM3622.pdf. Theoretically, you should be able to parallel up as many batteries as you need. R1 and R2 were intended to be soldered-in jumpers that would allow individuals to choose their deep-discharge reconditioning strategy. (Only connect one of these, otherwise you get a short circuit.)
The output stage is based on the LM2621. The datasheet is available here: http://cache.national.com/ds/LM/LM2621.pdf. The inductor at the input stage is turned on to charge up the inductor’s magnetic field. Then the transistor is turned off and the inductor must discharge through the diode D1 to charge up the capacitor C2. The rest of the circuit is feedback to regulate the voltage to the proper 5.1VDC. ( The reference design uses a 50kOhm resistor at Rf2, but I wanted 5.1VDC for load regulation margin, so I used 47kOhm.) This is sort of an inductive charge pump.
Of course to make this circuit properly with noise immunity, you really need to design a circuit board. This can be done by downloading free (!!) schematic capture and board layout software from www.pcb123.com. Parts can be purchased from DigiKey or Allied or similar. You really need to have 20 or 50 or 100 boards to begin to make this cost effective though. If you are making just one or two, the setup costs for board manufacture end up killing you. What might be better is to buy a battery pack made by logic3 and dissect the thing for the charging circuit/power supply. They probably have not used this exact circuit, but I bet you it is pretty close. I bought one here: http://www.nothingbutsoftware.com/
catalog_type_page/ProductCode/34474 for $20. I plan to tear it apart and figure out if I can make it work on a larger battery pack. I’ll let you know how it goes.One last thing, www.batterygeek.net is selling a 15 hour Li-ion pack for about $75, which ought to last you on a flight to anywhere in the world.
It’s an interesting read - check it out.
23 Comments »
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wo0o0o first 1 and shit thats kewl
That is pretty cool. For those 100 hour, no power, no contact, mountain hikes.
now thats just plan crazy but then cool #3
Anyone know what happened to all those halo threads?
eboot loader for 2.6 is out on pspupdates already so this can be the first comment for it before it’s posted on this site :)
thos halo thre ads…. they took it out but i downloaded them already :P
why did they take them off..?
Who gives a crap why they were taken off? I think the idea of teasing like that is just retarded. I’d rather know whats up then see a bunch of people hyped up for whats probably nothing.
actually my friend tested it and he said its just a menu thats it…. to show us its gonna work
I made a similar power supply using two 9v alkaline batteries in a altoids tin. I haven’t tested how long it will last. But it works fine. It’s a hell of a lot smaller too :)
It will do in a pinch.
y do all this when u can take out ur battery and just use the charger now that just simple as 1 2 3 come on now =)
woohooo more time to watch PORN..
I can just see it, getting on an airplane for an international flight with a rolled up container filled with batteries. Security I think would jump you carrying this little device even before you entered the airport.
lame shit
Is there anything a that can’t be done with a leatherman?!
no
Wooohoo, a double-post!
GO SPAM GO!!
RETARDED
snoop lol thats so true it looks like a bomb plus most airlines dont let u use handheld game consoles on flights
wtf is this its better to buy one :)
NO ITS A WASTE OF TIME YOU COULD BE CURING A DISEASE NOT WASTING TIME ON GHETTO BATTERYS but seriosly that thing looks cool
what homebrew is he playing
im sure if u bring this on a plain they will kick your taliban ass of the plane
lol