Hi,
I am hoping to build a balanced regulated LiFePO4 battery pack. I would like to be able to maintain a regulated voltage of at least 3V per cell throughout the discharge cycle. Further, I want to avoid switching elements in the balancing and regulation. As far as possible I would also like to minimise extra current draw due to the solution, though the other criteria mentioned take precedence. Im something of a novice, so please bear with my questions if they are stupid.
Can anyone recommend a suitable schematic?
If I regulate each cell individually with a VLDO linear regulator will this provide balancing or could it have the opposite effect? I am thinking that one of the cells may have lower internal resistance and thus provide more of the current than the others, causing the regulator equivalent resistance to decrease in order to maintain constant output voltage, thus increasing relative current flow from this cell. This could cause the voltage of this cell to drop more quickly than in others, again causing the equivalent resistance of the regulator to drop (relative to the others), again causing more current to flow from this cell than otherwise. Or is the cell output voltage a linear function of its internal resistance? Or is equivalent resistance the wrong way to think of a linear regulator?
I am hoping to build a balanced regulated LiFePO4 battery pack. I would like to be able to maintain a regulated voltage of at least 3V per cell throughout the discharge cycle. Further, I want to avoid switching elements in the balancing and regulation. As far as possible I would also like to minimise extra current draw due to the solution, though the other criteria mentioned take precedence. Im something of a novice, so please bear with my questions if they are stupid.
Can anyone recommend a suitable schematic?
If I regulate each cell individually with a VLDO linear regulator will this provide balancing or could it have the opposite effect? I am thinking that one of the cells may have lower internal resistance and thus provide more of the current than the others, causing the regulator equivalent resistance to decrease in order to maintain constant output voltage, thus increasing relative current flow from this cell. This could cause the voltage of this cell to drop more quickly than in others, again causing the equivalent resistance of the regulator to drop (relative to the others), again causing more current to flow from this cell than otherwise. Or is the cell output voltage a linear function of its internal resistance? Or is equivalent resistance the wrong way to think of a linear regulator?