Friday, September 30, 2016

BQ24650 Based MPPT li-ion Battery Charger Controller With MSP430 Microcontroller, MPPT adjust and 3 Channel LED PWM dimming.

In the addition to the little solar lighting project that i was working on i have created this little solar charge controller to charge lithium ion battery (li-ion).

Circuit Utilize Texas Instrument BQ24650 at the heart of loop to control charge. as circuit has external mosfet so maximum  charge current can be adjusted to really high values.  Circuit accept Solar Panel Values from 5V to 28V . i have tested it with 12V nominal (17Volts open circuit)  . and 24 Volts nominal Solar panel at Battery Charge current up to 4A. Currently installed in my house since few months Charging a 20000 mah li-ion battery.
Circuit has large 4 pin high current capacity Molex connector for solar panel , 6 pin connector for Battery and load switch.
it is also possible to connect NTC for battery temprature monitoring. BQ24650 can automaticalley monitor temprature of the battery. Microcontroller has dedicated 3 PWM output for LED dimming and 6 gpio pin header for bettery status led and a user interface key.