I'm new here but I have read a lot of topics here about my question. I am designing a solar battery charger with MPPT algorithm but I don't know if I am doing it well.
First of all my specs are here:
- 10 W peak power
- Maximum Power Current: IMP = 0.57 A
- Maximum Power Voltage: VMP = 17.49 V
- Short Circuit Current: ISC = 0.61 A
- Open Circuit Voltage: VOC = 21.67 V
- One cell Lithium-Polymer
- Nominal Voltage: 3.7 V
- Capacity: 1700 mAh (max 1C)
This is my actual schematic:
The µC is working from 3.3 V.
I've designed a buck converter with the following values:
The problem is controlling the MOSFET with PWM in full-closed and full-opened states. Should I use a gate driver IC or another method?
When the night comes, or the PV doesn't generate enough power, I have to stop the charging and MPPT. How do I know that the sun gives enough power to start MPPT, without starting it? (I was thinking about measuring the ISC to know the possible IMPP).
- Do I have to use a charger IC to protect the battery form bad charging behavior?
- What do you think about the MP2615 charger? Is it good in this case?
I hope you can help.