STEVAL-ISV009V1 STMicroelectronics, STEVAL-ISV009V1 Datasheet - Page 19

• Manufacturer Part Number: STEVAL-ISV009V1
• Description: Power Management Modules & Development Tools DUAL STG DC/AC CNVRT DEMO BRD
• Manufacturer: STMicroelectronics
• Series: -r

Specifications of STEVAL-ISV009V1

• Design Resources: STEVAL-ISV009V1 BOM STEVAL-ISV009V1 Schematic
• Main Purpose: DC/DC, Step Up
• Outputs And Type: 1, Non-Isolated
• Power - Output: -
• Voltage - Output: 36V
• Current - Output: -
• Voltage - Input: -
• Regulator Topology: Boost
• Frequency - Switching: -
• Board Type: Fully Populated
• Utilized Ic / Part: SPV1020
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AN3392
Normal/MPPT mode
Figure 16. PV panels, voltage-power and voltage-current curves
The Voltage-Current curve shows all the available working point of the PV panel at a given
solar irradiation. The Power- Voltage curve is derived by the Voltage-Current curve, plotting
the product V*I for each voltage applied.
Following figure shows the dataflow diagram of the MPPT algorithm implemented by
SPV1020:
Figure 17. MPPT data flow diagram
Voltage reference generated by the MPPT is always limited by the Over Voltage (V
) and
o-max
Voltage regulation (V
) control of the output (see next session for details).
o-th
This algorithm approach is defined as perturb & observe because the system is excited
(perturbed) with a certain duty cycle (DC), then power is monitored (observed) and then
perturbed with a new DC depending on the monitoring result.
SPV1020 executes the MPPT algorithm with a period that is 256 times the switching period
(switching period is 10us, by default) that is 2.56ms. This time is required for the application
to reach the new steady state (voltages and currents) after the perturbation of the DC, which
is 0.2% in most of the range.
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