hello,
I am using the STEVAL-ISV012V1 demonstration board, which is based on the SPV1040 solar voltage boost converter and the L6924D single-cell Li-ion battery charger.
My solar panel consists of 4 parallel solar cells.
The solar cell is: KXOB201K04TF-TR.
From the datasheet of the solar cell:
VOC open circuit voltage 2.76 V
ISC short circuit current 83.8 mA
Vmpp voltage at max. power point 2.23 V
Impp current at max. power point 78.7 mA
Pmpp maximum peak power 175.6 mW
with 4 solar cells in parallel:
Impp = 4 x 78.7 mA = 314.8 mA
Vmpp = 2.23 V
Pmpp = 702 mW
My battery is a Li-Ion battery, single cell, 3.7V 1100 mAh. (It is a GoPro Hero-3 battery).
Here is my test setup:
(4 solar cells in parallel)
Here is my measurement:
During this measurement, I used only two solar cells in parallel.
Pink is the current, yellow is the solar voltage, and blue is the battery voltage:
BUT in the application note:
I noticed the current graph has a higher period of current flow. See the pink graph below:
NOW, I would like to know how to increase the turn-on period. How to achieve the flow of current for a longer time, as shown in ST Application Note AN4050.
Which parameters should I check and tune to increase the period of current flow?
The development board operates in Quasi-Pulse Mode, which is suitable for the solar cell input.
Thank you in advance.
regards
