Intelligent battery charger circuit

[mbruck]

charger solar atmega

This is awesome charger.

But I'm working with Atmel AVR cpu's. Is posible to share PIC basic code, so I will translate whole project to ATMega and BASCOM AVR?

 

[codewiz]

burp charger

pls, anybody done charger for 100 to 200AH SLA batteries using microcontroller especially PIC without those special chips of microchip or avr app notes? i need it seriously. thanks

 

[blueroomelectronics]

nimh charger schematic 12v microchip

What special chips do you want to avoid?

 

[noname1806]

pic charger

hello..
i don,t know how to build the programming.
can u show me the example of the programming.
thanks.

 

[speedy29]

Devo proprio realizzare un caricabatterie, appena ho tempo lo realizzo e poi vi dico le mie imprssioni.

 

[macobt]

Hello Dexter Dude
I read all pages about this project''intelegent battery charger'' and I like it and i want to built it,but before I start I have some qwestions?
Can I programm the chip PIC16F628 with PICKIT2 Clone, and how to calibrate the charger with this programmer,I have PIC16F628-04 i/p is need for this chip any crystal?
And finaly what letters are shown on led display and what they mean?
Best Regards macobt

 

[Dexter Dude]

I do not own a PICKIT2 Clone( there are quite a few variants ) but if you check your programmer specifications I'm sure you will be able to find out .

This charger uses no Xtal please see schematic on page 4 .

A:" letters are shown on led display and what they mean?"
I already explained that , but here we go
I battery in or just 1 element connected
S slow charge
H high charge
F finish charging and start trickle charging
P Peak error or voltage unmodifed for 10minutes => some error ocured
2 2 elements connected
3 3 elements connected
4 4 elements connected
E A error on accumulator / battery not connected / battery disconected => connection error

 

[LOSTISLAND]

Hi all,
I put a C Codevision code
It's inspired from Atmel application note with some changes
It's a 3 state PWM FAST charger C code
if anybody is interested I can explain more
It worked good
But The source code isn't just a charger
but the charger part footprint in the code is clear

 

[LOSTISLAND]

it is the schematic of fast pwm charger I mentioned above

 

[macobt]

I do not own a PICKIT2 Clone( there are quite a few variants ) but if you check your programmer specifications I'm sure you will be able to find out .

This charger uses no Xtal please see schematic on page 4 .

A:" letters are shown on led display and what they mean?"
I already explained that , but here we go
I battery in or just 1 element connected
S slow charge
H high charge
F finish charging and start trickle charging
P Peak error or voltage unmodifed for 10minutes => some error ocured
2 2 elements connected
3 3 elements connected
4 4 elements connected
E A error on accumulator / battery not connected / battery disconected => connection error

I make it the charger and works,I calibrated by second metod with trim pot,My problem is when I put 2 batteries in charger first he show (I) than goes to slow and high,why he dont show 2 bateries in first place?
Here is picture of my charger

 

[Dexter Dude]

The trim-pot is not corectly calibrated .


Did you use this method :
"The ratio between (Charger output) / Voltage on Pin 17) should be 2.1:1 . So if you have 0.803V on charger output -> adjust Pin 17 to 0.382V " ?

 

[macobt]

I measure the dc voltage on charger output it is 2.85V,and with adjusting the pot(I have multyturn pot of 2kohm,on pin 17 I get between 0.19 and 0.25 volts.
Please help,I realy want this charger to work
Regards maco bt

 

[@t]

it is the schematic of fast pwm charger I mentioned above

LOSTISLAND, can you provide the schematic in PDF, bmp or jpg?
I don't know how to open your file.
Thanks.

 

[Dexter Dude]

"" I measure the dc voltage on charger output it is 2.85V" <- I presume the PIC is not in the charger (removed from socket , power is OFF) and you connected 2 batteries o the charger . Then do the following : adjust the trim-pot like this ratio between (Charger output) / Voltage on Pin 17) should be 2.1:1 . So if you have 2.85V on charger output -> adjust Pin 17 to 1.357V .
If by adjusting the trim-pot does not satisfy the above mentioned rule than you probably mounted a diode the wrong way or one of the close components is defective .

 

[macobt]

"" I measure the dc voltage on charger output it is 2.85V" <- I presume the PIC is not in the charger (removed from socket , power is OFF) and you connected 2 batteries o the charger . Then do the following : adjust the trim-pot like this ratio between (Charger output) / Voltage on Pin 17) should be 2.1:1 . So if you have 2.85V on charger output -> adjust Pin 17 to 1.357V .
.

Hello Dexter
I try again this metod by measuring the dc on charger out and my bateries are 2.8volts,so on pin 17 should get 1.35 volts but I get no more than 0.4 volts on pin 17(Adjusting with pot),I do it this test with PIC out of charger,and I check all components they are OK,can you post once again the hex file for the chip,and to try with first mhetod with hex for calibrating.
I do not know where to find the mistake
Please help

 

[Dexter Dude]

The hex file is posted on page 4 on this thread . I'v made a picture which might help you to do a proper calibration ( after all ,it's just a voltage divider trouble ). Hope this helps .
Also , double-check your PCB for errors or solder bridges (maybe post your PCB for other users to see ) .

Good luck !

 

[macobt]

I check all parts and there are ok,finaly I check my PIC16F628 and I can read and write on him but anyway I buy a new one and gues what finaly it worked out,I calibrated by first mhetod,I measure the dc voltages when the charger is on,with batery in and without PIC insade,on pin 17 I adjust the desire value 1.35 volts.
Now when I put bateries in it show 2 batery in and it is ok,but with other type of nimh batery its show one batery????
Tell me please it is this explanation with measuring the voltages ok,like I wrote above??
Thanks for helping
Best regards

 

[LOSTISLAND]

it is the schematic of fast pwm charger I mentioned above

LOSTISLAND, can you provide the schematic in PDF, bmp or jpg?
I don't know how to open your file.
Thanks.

You could open that with Altium Designer 6 ,
but here is pdf format

 

[sarmad_101]

Message is unavailable.

 

[Dexter Dude]

Your calibration seems to be slightly off .Be sure to follow this rule ratio between (Charger output) / Voltage on Pin 17) should be 2.1:1 .You could adjust the trim-pot in order to increase voltage on pin 17 by 30-50mV .This way the problem battery pack will read "2" instead of "1" . The exact adjustment it is used only by discharging procedure and by detecting the number of batteries attached , charging only uses deltaV so a precise calibrated voltage it is not mandatory .

For a better calibration please use method 2 ( serial connection with PC using an USART adapter like MAX232 or someting similar ) .