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The figures below show the energy harvester circuit performance in terms of MPPT accuracy and power
conversion efficiency in case of light source from a fluorescent tube lamp 6'500 K (irradiation levels from 250 to 5
k Lux) and from the solar light (from 0.06 to 1 W/m2) irradiation conditions.
Figure 13.
Figure 14.
1.4.3.4
Recharge via micro-USB connector
The
STEVAL-GPT001V1
supply source (e.g., a USB port) to activate a fast battery recharge controlled by the STBC08PMR(For details on
the device, refer to the related datasheet at www.st.com).
The ESD protection is featured by USBLC6-2P6, a monolithic application specific device dedicated to high speed
interfaces. The very low line capacitance ensures a high level of signal integrity without compromising sensitive
chip protection against the most stringently characterized ESD strikes.
The
STBC08PMR
within USB power specifications.
The charge voltage is fixed at 4.2 V (typical value) and current limitation can be programmed via a single resistor
connected between PROG pin and GND.
UM2260 - Rev 2
STEVAL-GPT001V1 cradle board battery energy harvesting: indoor irradiation
STEVAL-GPT001V1 cradle board battery energy harvesting: outdoor irradiation
cradle board has an ESD protected micro-USB connector that can be plugged to a 5 V
is a constant current/constant voltage charger for single-cell Li-Ion batteries designed to work
UM2260
page 12/25
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