Need battery charger - 3 AAA NiMH Battery

• May 29, 2004

• #1

R

real_tr

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nimh charger schematic

hi to all

i need a 3 NiMH Battery Charger schematic (smart)
I make some search on internet and found Dallas's DS2700 ic
other ic's use so many componets on ic and some of them doesnt have an application circuit on their pdf
DS2700's bad property is it look to the temperature of the battery and at my circuit my battery is so far from the battery charger circuit that charger cannot meausure temperature.
Can anyone help ?

Thanx..

MeCeX

 

• May 29, 2004

• #2

M

ME

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max712 battery charger

Try to have a look at this intelligent battery charger reference design using an Atmel AVR microprocessor:

http://www.atmel.com/dyn/products/app_notes.asp?family_id=607
AVR450: Battery Charger for SLA, NiCd, NiMH and Li-ion Batteries (44 pages, updated 11/02)
This Reference Design is a battery charger that fully implements the latest technology in battery charger designs. The charger can fast-charge all popular battery types without any hardware modifications. The charger design contains complete libraries for SLA, NiCd, NiMH and Li-Ion batteries.


Features
• Complete Battery Charger Design
• Modular “C” Source Code and Extremely Compact Assembly Code
• Low Cost
• Supports Most Common Battery Types
• Fast Charging Algorithm
• High Accuracy Measurement with 10-bit A/D Converter
• Optional Serial Interface
• Easy Change of Charge Parameters
• EEPROM for Storage of Battery Characteristics


Description
The battery charger reference design is a battery charger that fully implements the latest technology in battery charger designs. The charger can fast-charge all popular battery types without any hardware modifications. It allows a full product range of chargers to be built around a single hardware design; a new charger model is designed simply by reprogramming the desired charge algorithm into the microcontroller using In-System Programmable Flash memory. This allows minimum time to market for new products and eliminates the need to stock more than one version of the hardware. The charger design contains complete libraries for SLA, NiCd, NiMH, and Li-Ion batteries.


There is downloadable source code for two versions:
C source code for Atmel AVR AT90S2333 or AT90S4433
Asssembly source code for Atmel AVR ATtiny15

Application note: http://www.atmel.com/dyn/resources/prod_documents/doc1659.pdf
Source code: http://www.atmel.com/dyn/resources/prod_documents/avr450.zip

 

• May 29, 2004

• #3

Ante

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nimh battery charger schematic

I recommend the MAX 712, have used it a couple of times and it works perfect. **broken link removed**

Ante :roll:

 

• May 30, 2004

• #4

K

kasamiko

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lm317 nimh battery charger circuit pdf three

And you can request free sample of MAX712 on Maxim website too.. 8O

 

• Jun 5, 2004

• #5

B

benri22

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basic nimh charging circuit

you can using google search the site:
the keyword: "battery charger", schematic

I am always doing this way in which I got a lot of information regarding what I am looking for.

 

• Jun 5, 2004

• #6

M

ME

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max712 problems

benri22 said:

you can using google search the site:
the keyword: "battery charger", schematic

I am always doing this way in which I got a lot of information regarding what I am looking for.

Click to expand...

You don't need Google to search this site, we have our own search function: www.edaboard.com/search.php
This search function is much more efficient for searching EDAboard than Google is.

 

• Jun 14, 2004

• #7

Y

yeechyan

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nimh charger schematics

Try to search for the datasheet of the regulator IC LM317. There's a sample charger circuit included for the LM317.




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• Jun 14, 2004

• #8

C

C-Man

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nimh battery+charger+scheme+simple

yeechyan,
please do not post files which are freely available on the net, post a link like this instead:

**broken link removed**

best regards

 

• Aug 7, 2004

• #9

T

tong

Guest

circuit diagram for nimh charger

MAX712/713 have problem with some batts.

If the voltage 0.25 volt is wrong, the timer and A/D
won't work.

Some batts or old batts make the 0.25v error.
I think it comes from internal resistant.

 

• Aug 7, 2004

• #10

N

nikifena

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max713 scheme atmel

before some months I make a charger with LM3647 froma National
I use it for 2 or 4 NiMH or NiCd batteries, but it's easy to configure for any range of batteries.
I give a eagle files with PC board and schemes.
I have some troubles with make chip design in eagle, but board is OK
(on pcb lm3647 is mirrored)

PS: If someone like to make changes on board, I will be happy to see his design

 

• Aug 8, 2004

• #11

T

tong

Guest

30451c.zip

If you localed in USA, you can order sample IC or buy chip IC from many company.

national, maxim-ic, onsemi.com

There are many good chip IC out there.
But beware of max713/712. It's old fashion chip.
There are many problems. One is internal resistant and one is trickle current for ni-mh is too high.


Onsemi have one PDIP type, MC33342-D

BQ2003 series

LM series

 

• Aug 8, 2004

• #12

Ante

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battery charger nimh schematic

Tong,

There is noting wrong with the MAX chip as long as you use professional quality batteries, don’t buy those cheap crappy once and you will be fine.

Ante :roll:

 

• Aug 11, 2004

• #13

T

tong

Guest

nimh charger source code

Yes, I have 20 Toshiba ( the deep blue ) and SANYO 1800 ( deep green ).

charging at C/3 only 1 cell.

Sometime I can fast charge to 6 hrs.!! without terminate.

I meter the voltage across R sense, I didn't 0.25v
for some batts.

What's wrong ?

 

• Aug 11, 2004

• #14

Ante

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nimh aaa battery charger circuits usb

Tong,

Which value does Rsense have?

Ante :roll:

 

• Apr 17, 2005

• #15

S

sajal1975

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ni-mh charger circuit diagram

hi,
nimh charger help can be at
www.geocities.com/euro446/models.html

 

• Mar 8, 2006

• #16

N

nta119

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battery charger schematic for aaa

I am fresh in this forum. can any one show me the 4 AA NIMH circuit diagram (+6 V). i am using the dc adapter 12V 1A as power source. thank you.

 

• Jun 23, 2006

• #17

R

rajudp

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nimh battery charger lm317

i was not able to open eagle file

 

• Oct 23, 2006

• #18

I

isasis

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max712 türkiye

Need PCB on LM3647

 

• Oct 24, 2006

• #19

Q

Quibbler

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nimh recharger circuit

I've made many types of NiCd and NiM-H chargers, IMHO the temperature sense is by far the best method. I have found when you're wacking in a lot of power monitoring the over-voltage is not reliable as there is always some small and variable junction potential between the bateries and their holder.

 

• Nov 4, 2006

• #20

E

elcielo

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battery charger design maxim 712

Intelligent Battery Charger Reference Design

https://ww1.microchip.com/downloads/en/AppNotes/30451c.pdf