SLUAAI1 December   2021 BQ25798

 

  1.   Trademarks
  2. 1Introduction
  3. 2Solar Battery Charging with the BQ25798
    1. 2.1 Making Use of FOCV
    2. 2.2 BQ25798 Key Features for MPPT
    3. 2.3 BQ25798 Key Registers
    4. 2.4 BQ25798 MPPT Algorithm
    5. 2.5 Using Charge Current for Algorithm Improvement
    6. 2.6 Second Algorithm in Action
  4. 3Summary
  5. 4References

3 Summary

Two different algorithms to implement solar MPPT with the BQ25798 were discussed. They both make use of the key VINDPM feature that allows the input voltage to be maintained at the MPP. The first method requires just setting the VOC_PCT and keeps the VINDPM at the value of the multiplication of the OCV and the VOC_PCT. Adding in the tracking of the charge current allows greater flexibility to find the MPP.