ST STEVAL-ISV012V1, Application Note

Page: 10 / 17

Reference design description AN4050
10/17 DocID022816 Rev 3
3 Reference design description
The set-up used for measurements is shown below.
Figure 12: Application set-up
A solar array simulator (SAS, SAS-FL05/01 from CBL Electronics) to simulate the PV
module with V
OC
= 2.5 V, I
SC
= 210 mA, V
mp
= 2.0 V, I
mp
= 200 mA (@ 1000 W/m²
irradiance) and a Li-Ion battery 3.7 V-700 mAh, are used. Figure 13: "V-I and P-V plot
diagrams" shows the I-V and P-V curves generated by the SAS, obtained using a PV
module analyzer (ISM490 from ISOTECH).
Figure 13: V-I and P-V plot diagrams
Figure 14: "Partial charge" and Figure 15: "Full charge" show the partial and full charge
curves respectively. The partial charge curve shows charge current and voltage within a
one hour time frame at full irradiation starting from a 3.4 V condition. The full charge curve
shows charge current and voltage until the fully charged status is triggered, starting from a
3.4 V condition. After the one hour charge period time, the battery voltage reaches 3.8 V.
Different results can be obtained if a different PV panel and/or battery are used
a
.
a
Visit the support section on www.st.com if you require help regarding the use of different PV panels or batteries.