OESF | ELSI | pdaXrom | OpenZaurus | Zaurus Themes | Community Links | Ibiblio

IPB

Welcome Guest ( Log In | Register )

> Battery Extenders
Ferret-Simpson
post Mar 20 2006, 11:40 AM
Post #1





Group: Members
Posts: 573
Joined: 8-June 05
Member No.: 7,295



http://www.solware.co.uk/psp/psp-battery.shtml

I SWEAR that would just detonate the PSP battery. . ..
Go to the top of the page
 
+Quote Post
 
Start new topic
Replies
Da_Blitz
post Feb 13 2007, 09:30 PM
Post #2





Group: Members
Posts: 1,565
Joined: 7-April 05
From: Sydney, Australia
Member No.: 6,806



i am assuming nicads here, if so then the charging circuit makes sense, not the best or the most efficent but its ugly and it works.

things to watch out for: the 0.6v drop across the diodes (in this case the drop should be closer to 0.6 rather than 0.7) not the best way to do it but its very robust. now for 0.6V*0.5A we get 0.3W so you could use a small signal diode instead, saves alot of room

i would actually look into a 2 cell charger with a buck boost converter. hackaday had one. you put 2 cells in series giving you about 3v and use the boost to pump it up to 5v at high efficcy. you would be looking at about 80% efficency at such small voltages where as your design relies on resistive parts giving it a good iffence on discharge (only loss is via the diode) but really bad on the charge (lot of power wastage in the diode)

other thing to watch out for is reling on the nicads to give 1.25V, this is a VERY BAD IDEA, at full charge they can give more than that for about 5 mins, meaning a dead Z if you are unlucky. also as the battries discharge once you hit 80% capacity the voltage falls rapidly, meaning you could lose up to 20% of the total battery capacity

if you have a pic programmer then you can get really good high effincy battery charger/discharger plans off of the net. if you dont then there are others that reliy on discreete ICs that have better effincy but less features. the advantage is they all fit in an altoids tin smile.gif
Go to the top of the page
 
+Quote Post

Posts in this topic
Ferret-Simpson   Battery Extenders   Mar 20 2006, 11:40 AM
Ferret-Simpson   http://www.consolesandgadgets.co.uk/catalo...atter...   Mar 20 2006, 11:48 AM
rrnwexec   7200 mAh or stated another way... enough to power...   Mar 20 2006, 02:46 PM
Da_Blitz   http://www.consolesandgadgets.co.uk/catalo...atte...   Mar 23 2006, 04:53 AM
jpmatrix   QUOTE(Da_Blitz @ Mar 23 2006, 02:53 PM) http:...   Mar 24 2006, 04:25 AM
rrnwexec   QUOTE(Da_Blitz @ Mar 23 2006, 02:53 PM)http:/...   Mar 24 2006, 08:00 AM
macemoneta   I use this with my Sl-5500: http://cgi.ebay.com/w...   Mar 26 2006, 07:35 AM
Curious Aardvark   the first unit is actually an 1800 battery with a ...   Mar 28 2006, 02:12 AM
ntw1103   I am using a custom battery pack that I made. bat...   Jan 8 2007, 09:57 PM
daniel3000   QUOTE(ntw1103 @ Jan 9 2007, 07:57 AM)I am usi...   Jan 9 2007, 12:00 AM
Ling   I am using the Joytech PSP Power Extender. I got m...   Jan 11 2007, 06:26 PM
Jon_J   I know this is more expensive, as most all things ...   Jan 11 2007, 07:29 PM
ntw1103   I will post the diagram as soon as I make one.   Jan 11 2007, 07:35 PM
speculatrix   Brando have a good range of PSP power accessories:...   Jan 12 2007, 01:46 AM
ntw1103   Okay, here is the diagram for my battery. This is ...   Feb 9 2007, 07:03 PM
speculatrix   QUOTE(ntw1103 @ Feb 10 2007, 04:03 AM)Okay, h...   Feb 10 2007, 12:45 PM
pelrun   Ntw's circuit is pretty scary. The only compo...   Feb 11 2007, 07:25 PM
Da_Blitz   i am assuming nicads here, if so then the charging...   Feb 13 2007, 09:30 PM
jpmatrix   hi here i've just found and bought the Etitech...   Apr 30 2007, 04:53 AM
Capn_Fish   I'm looking at building a battery extender for...   Jun 3 2007, 02:41 PM
speculatrix   QUOTE(Capn_Fish @ Jun 3 2007, 11:41 PM)I...   Jun 4 2007, 02:15 PM
Capn_Fish   QUOTE(speculatrix @ Jun 4 2007, 05:15 PM)QUOT...   Jun 4 2007, 02:52 PM
speculatrix   you have to have an intelligent charging circuit f...   Jun 5 2007, 03:45 AM
pelrun   It's really a bad idea to do this yourself, un...   Jun 5 2007, 05:58 AM
laan   Purchased this one today: http://www.portablepowe...   Jan 14 2008, 04:11 AM
speculatrix   QUOTE(laan @ Jan 14 2008, 12:11 PM) http:...   Jan 14 2008, 04:48 AM
laan   QUOTE(laan @ Jan 14 2008, 01:11 PM) Purch...   Jan 14 2008, 11:15 AM
tanjian2   I've had a Zap Universal Power supply (blew up...   Jan 15 2008, 01:55 AM
jpmatrix   QUOTE(laan @ Jan 14 2008, 01:11 PM) Purch...   Jan 15 2008, 04:48 AM
Capn_Fish   Something like this: http://www.sparkfun.com/comm...   Jul 14 2008, 07:56 PM
xamindar   I am looking for a battery extender that I can plu...   May 11 2010, 05:19 PM
koan   I've been using a Sanyo Eneloop KBC-L2 for som...   May 12 2010, 01:36 AM
xamindar   Thanks for the recommendations. I didn't know ...   May 12 2010, 02:54 AM
xamindar   Well, got it. It works but gets really hot. It end...   May 26 2010, 05:08 PM
koan   QUOTE(xamindar @ May 27 2010, 11:08 AM) W...   May 27 2010, 04:56 AM


Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



RSS Lo-Fi Version Time is now: 24th April 2015 - 05:58 PM