Harvesting module and power monitoring board

AN4396

16/19

DocID025514 Rev 1

Figure 7 shows the connection of the harvesting module and the power monitoring board of

the STEVAL-ISV021V1 kit.

Figure 7. Power monitoring board (left) and energy harvesting module (right)

The power monitoring board allows to measure up to three voltage-current pairs when

connected to a generic DUT. This board can acquire up to 12800 samples per second when

a single channel is active. For multi-channel acquisition the available bandwidth is split

among the three channels. Two channels can acquire currents in the range 1

A - 15 mA,

while the third one works in the range 1

A - 1 mA. This board can be used as a general

purpose measurement board, and in this case is a part of the STEVAL-ISV021V1 kit. The

ambient light irradiation, the input supply operating points (the input voltage and current of

the harvested source) and the output stage operating points (the battery voltage and

current) are sampled.

The sampled parameters can be displayed by the GUI once the monitoring board is

connected to a PC or laptop through the dedicated USB cable.

Note:

Please note, that connecting the harvesting module to the power monitoring board, while

this is not powered through the USB cable, causes current draining from the battery, and

hence potential damages.

The GUI is arranged in four selectable “tabs”:



Configuration: allowing the setup of the power monitoring board.



Data visualization: not used with the STEVAL-ISV021V1.



Power visualization: displaying the power sink by the load eventually connected to

the “extension” connector J25.



Efficiency: displaying the system performances both in terms of MPPT accuracy and

power efficiency.