Aaron's Homepage Forum
Aaron's Homepage Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ
 All Forums
 Electronics
 Power Supply
 NiMH charger

Note: You must be registered in order to post a reply.
To register, click here. Registration is FREE!

Screensize:
UserName:
Password:
Format Mode:
Format: BoldItalicizedUnderlineStrikethrough Align LeftCenteredAlign Right Horizontal Rule Insert HyperlinkInsert EmailInsert Image Insert CodeInsert QuoteInsert List
   
Message:

* HTML is OFF
* Forum Code is ON
Smilies
Smile [:)] Big Smile [:D] Cool [8D] Blush [:I]
Tongue [:P] Evil [):] Wink [;)] Clown [:o)]
Black Eye [B)] Eight Ball [8] Frown [:(] Shy [8)]
Shocked [:0] Angry [:(!] Dead [xx(] Sleepy [|)]
Kisses [:X] Approve [^] Disapprove [V] Question [?]

   Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG)

   

T O P I C    R E V I E W
chandan.ahluwalia Posted - Jan 16 2013 : 09:49:58 AM
Hello Everyone,
I am coming here after a long time.
I remember those days when I used to stick to the screen and watch all the posts here and gather as much information as I could.
Then I got a job and everything changed . No more time for new circuits any more.

Anyways, I was looking for a simple circuit which can be build using the parts which are easily available.

As you can see, I am from India and getting a universal charger from overseas is pretty costly!

I need a charger which can charge a battery pack consisting of 6 AA 2100Mah Cells which theoretically 7.2V.

It would be great if I can power that charger from regulated 12V DC off a spare computer SMPS.

I do not need a PCB diagram as I will construct it on a normal board which has a lot of holes for solder(Don't know what its called).

Thank you for your help in advance

Regards,
Chandan Ahluwalia.
2   L A T E S T    R E P L I E S    (Newest First)
audioguru Posted - Jan 28 2013 : 09:19:40 AM
Energizer and two Japanese Ni-MH cells manufacurers advise NOT to trickle-charge them at more than only 1/40th their capacity.
Each cell might reach 1.5V when fully charged.
A charger IC should be used that regulates the charging current to 1/10th the capacity then it disconnects when it senses a full charge.
pebe Posted - Jan 16 2013 : 12:08:53 PM
I assume your cells are Nicads or Ni-Mh. You should always charge these from a constant current source. If you assume the charging voltage to be about 1.35V per cell you can feed them in series from your 12V supply via a resistor that will drop about 4V.

The recommended charging rate for 2100mA cells would be 210mA. An 18ohm 2W would give a charging current of 217mA so should be OK. Charging from the fully discharged state would take 14hrs

Aaron's Homepage Forum © 1995-2020 AARONCAKE.NET Go To Top Of Page
This page was generated in 0.06 seconds. Snitz Forums 2000