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| Comparator hysteresis issues |
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| StillTrying:
You don't show how the cells are connected in series, or not, that's quite an important bit in getting each cells supply and reference to work. https://forum.allaboutcircuits.com/threads/battery-charging-cutoff-using-tl431.137944/ https://320volt.com/en/balancing-li-ion-li-polymer-batteries-battery-balancing-circuit/ https://sound-au.com/articles/lithium-charging.htm |
| Pentoad:
Each cell has one of these circuits on it and the cells are connected in series. B- is cell negative and B+ is cell positive. K1 4 is just the output of the relay which will be on each module so K1 4 is connected through the relay to B+ when the relay coil is energised using an external 5v source. The comparator and all other electronics in the module are powered by the cell and the modules are not connected to each other in any other way. I will add the full diagram later today. |
| StillTrying:
"The comparator and all other electronics in the module are powered by the cell" Makes sense. :) If powering the LM239 from the 3V-4.2V cell voltage, you'll have to make its ref voltage and its cell voltage inputs about half(or less) = 1.5V-2.2V because the LM239's inputs don't work within 1.5V of its VCC. http://www.ti.com/product/LM239 |
| Pentoad:
I was a bit concerned about that. I am using a 2.048v LM4040 so that's a bit close. Looks like I will have to find one of a lower voltage as one of the comparators is being used for low voltage cutoff detection as low as 2.5v if the module is to be used on lifepo4. This appeared to work in my tests however but will probably be unstable as the reference is too close to the supply voltage in this condition. |
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