N-mosfets N_MOS_1 and N_MOS_2 act together as SPDT switch. They allow battery cells to be connected either in series or in parallel (for charging).
P-mosfets P_MOS_3 and P_MOS_4 interrupt connections to chargers.
P_MOS_5 interrupts connection to the load.
P_MOS_3 and P_MOS_4 are there to protect chargers from high voltage when batteries are in series configuration. (Though probably can get away without the P_MOS_3).
To monitor voltages of individual cells at later stage I will add voltage dividers and 16bit ADC.
- Have I connected the pull-up resistors right on p-mosfets?
- Can I replace P_MOS_3 and P_MOS_4 with schottky diodes? Or can these be n-mosfets instead, between charger connector and the ground?
- Is there something I missed here?
ps. At current of 1A a mosfets with R(DS)on of 5mOhm will cause a voltage drop of 0.005v. So it's probably can be safely ignored..
pps. I hope to keep this schematic scalable, to be able to connect more batteries in series (within mosfet voltage limits).