How to build a low cost great features PC based smart charger- discharger which can charge any NiCd or NiMH battery packs.
- The circuit uses the PC power supply , or any 12V power source.
-The circuit uses The "Temperature slope" method which is the most accurate and safe method, in this case the packs are charged by monitoring the temperature and end the charge when the charger sense the end of charge dT/dt, which depends on the battery type.
Two parameters are used as a backup to avoid over charging:
- Maximum time: The charger will stop after a predetermined time according to the battery capacity
- Maximum temperature: You can set the Max. battery temperature to stop the charging when it becomes too hot ( about 50 C ).
- The charger uses the PC serial port, i have built the software with Microsoft Visual Basic 6 with an Access database to store the battery parameters and charging profiles.
- A log file is generated with each charging process showing the charged capacity, charging time, cutoff method ( time or Max. temperature or Max. slope )
- The charging characteristics is displayed online through a graph ( Time versus temperature ) to monitor the battery temperature.
- You can discharge your packs as well as measuring it's actual capacity.
- The charger has been tested with more than 50 battery packs, it realy works great.
- The circuit uses the PC power supply , or any 12V power source.
-The circuit uses The "Temperature slope" method which is the most accurate and safe method, in this case the packs are charged by monitoring the temperature and end the charge when the charger sense the end of charge dT/dt, which depends on the battery type.
Two parameters are used as a backup to avoid over charging:
- Maximum time: The charger will stop after a predetermined time according to the battery capacity
- Maximum temperature: You can set the Max. battery temperature to stop the charging when it becomes too hot ( about 50 C ).
- The charger uses the PC serial port, i have built the software with Microsoft Visual Basic 6 with an Access database to store the battery parameters and charging profiles.
- A log file is generated with each charging process showing the charged capacity, charging time, cutoff method ( time or Max. temperature or Max. slope )
- The charging characteristics is displayed online through a graph ( Time versus temperature ) to monitor the battery temperature.
- You can discharge your packs as well as measuring it's actual capacity.
- The charger has been tested with more than 50 battery packs, it realy works great.
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Signing UpStep 1: The Schematic
The circuit can be divided into e main parts:
Measuring the temperature:
This is the most interesting part of the project, the purpose is to use a low cost design with a low cost components along with a good accuracy. i have used the great idea from
http://www.electronics-lab.com/projects/pc/013/ , review it , it contains all the required details.
A separate module in the program has been written to measure the temperature, as it can be used in other purposes.
The charging circuit:
================
- I used LM317 in the first design, but the efficiency was too bad and the charging current was limited to 1.5A, in this circuit i used a simple adjustable constant current source, using one comparator of the LM324 IC. and the high current MOSFET trannsistor IRF520.
- The current is adjusted manually using the 10Kohm variable resistor. ( i'm working on changing the current through the software ).
- The program controls the charging process by pulling Pin(7) high or low.
The discharging circuit:
===================
- I have used the remaining two comparators from the IC, one for discharging the battery pack and the other for listening to the battery voltage and stop the discharging process as soon as it drops to a predetermined value ( for ex. 1V for each cell )
- The program monitors pin(8) , it will disconnect the battery and stop charging when it's logic level "0".
- You can use any power transistor can handle the discharge current.
- Another variable resistor ( 5K ohm ) controls the discharge current.
Measuring the temperature:
This is the most interesting part of the project, the purpose is to use a low cost design with a low cost components along with a good accuracy. i have used the great idea from
http://www.electronics-lab.com/projects/pc/013/ , review it , it contains all the required details.
A separate module in the program has been written to measure the temperature, as it can be used in other purposes.
The charging circuit:
================
- I used LM317 in the first design, but the efficiency was too bad and the charging current was limited to 1.5A, in this circuit i used a simple adjustable constant current source, using one comparator of the LM324 IC. and the high current MOSFET trannsistor IRF520.
- The current is adjusted manually using the 10Kohm variable resistor. ( i'm working on changing the current through the software ).
- The program controls the charging process by pulling Pin(7) high or low.
The discharging circuit:
===================
- I have used the remaining two comparators from the IC, one for discharging the battery pack and the other for listening to the battery voltage and stop the discharging process as soon as it drops to a predetermined value ( for ex. 1V for each cell )
- The program monitors pin(8) , it will disconnect the battery and stop charging when it's logic level "0".
- You can use any power transistor can handle the discharge current.
- Another variable resistor ( 5K ohm ) controls the discharge current.
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So, it has been unpublished. Please do not republish until it has been corrected. When you republish, if everything is fixed, I'll remove this note. Multiple attempts to republish without correction will result in deletion.
Just wondering if you managed to complete this instructable ?
i know its been a few years since the original posts but this software and the schematic would be greatly appreciated for my home project, i have recently become severely mobility impaired and started learning electronics (now that im stuck in one room full-time!) and have over two dozen (28!!!) varying sizes battery packs that would greatly benefit these tests using you excellent 'ible !
Please could you say if this is complete and/or if you could email me all the info including full parts listing so i too can make one of these 'super battery pack charger/discharger's' ??? !!!! ???
many thanks in advance for any or all help given through pm and i'll post you my email addy !!!
keep up the great inventive work !!!
Thanks a lot for your e-mail,
Actually i have made this project long time ago, all the info i have is posted to the website, but i think the schematic is a little bit missing some parts numbers, i think this can be sent.
But the final version of the software is the one on the website
Please let me know how can i help you in this project
By the way, i still have the circuit in the picture, i don't need it any more, but the shipping cost is high, better to build it at home.
I will try to help you as much as i can.
Regards
Hossam
I'm gathering the components at the moment and have downloaded all the software and schematic but the link for the research i need does not work anymore and i would very much like to see the extra information from the dead link (understandable considering how much time has past !)
here is the text from your 'ible that i need the link for:
Measuring the temperature:
This is the most interesting part of the project, the purpose is to use a low cost design with a low cost components along with a good accuracy. i have used the great idea from http://www.electronics-lab.com/projects/pc/013/ , review it , it contains all the required details.
Would you be able to remember the name of the project from the electronics-lab.com website that has all these required details ?
or if you could write me down the full list of exactly which components (capacitors, resistors, IC's etc) your original circuit used and all values so that i can start ordering the parts?!!!?
Once again, thanks for the great help in Reviving this Old But EXCELLENT Project as i need to breathe New-Life into it !!!
It would be a whole lot more useful if it was universal!
Hi.
I think that your diagram is not well. First, the diode at pin 2 LM324 is turned. I think ,anode have to go at pin2 ,cathode at gnd to establish 0.6v at pin2.
Second,I have 3 v to 4v at fan with slow moving ventilation.Which type of the fan I must use: at 5v ,or 12v?.When I put 82k resistor between VCC and the baseof the transistor (I put BC639 ) I have about 8v to 9v, but BC639 is just warmer(about 40 to 50 Celsius degree.Third , cooling fancontacts need to be turned (oposite).
Fourth,100kOhm resistor at trimer 10kOhm#pin12 LM324,I think it should be there.Without 100kOhm , don't have current adjustment at all. With resistor ,have
current range from 0 to 0.65 A max..Why is that?.And,finally , In software you have a bug when I turn CHARGE button, next PAUSE,and again CHARGE button the program says '55 error' and close the program.
Best Regards from Serbia-Belgrade
Right mouse click on the link, "Save target as", let it download to your computer. It will save as FA2OIVDFDO2058V.htm. Once the download is completed change the .htm extension to .rar. Then open the file and it will unpack properly. Note: you will need Winrar or another program that opens RAR compressed files.
I just love batteries too (Link) . Just made a dis charger with Arduino .
Nice work .
thank you in advance. -~