Charging high voltage lipos: a different approach to cell balancing.
Faced with 3 11.1 V RC lipos at 2200 mAh to make 33.3 V for 'buffer' for cooker, and solar power to charge it , I was wondering... how to safely do cell balancing.. I have seen many schemes,
But then had this idea, I once bought 20 pieces of MCP73831T single cell lipo / liion charger chips for < 4$ on ebay, only used a few so far, and those have proven themselves with daily charge, discharge. So 3.7 V per cell out.
9 cells (3 x 3).Those chips need 6 V or a bit lower in. say 5 V to reduce dissipation. Say 6 turns on a transformer.
9 windings of 6 turns, and the primary some push pull 12 turns on solar panel. Costs: only the resistors and diodes... some caps, all in the [no junk] boxes. Charge current say 400 mA. 5 to 6 hours charge time... for 2200 mAh. Small transformer, 15 VA (33.3 * .5), can wind it in an hour.Anybody overlook something?
Sure 400 mA (500 is chip limit) is not that much, but solar for that it is just right, would be < 1.5 A from the solar panel.
mm Yu kan fissiolize ze zirkuit no?
If not ye'r puzzies :-) ;-) (-;