Abstract
In this work, an amorphous silicon (a-Si:H) thin-film
transistor (TFT) circuit designed for charging of intermediary energy
storage devices using photovoltaic (PV) solar cell arrays is demonstrated
and analyzed. The proposed circuit combines the functionality of a linear
DC–DC voltage regulator and a maximum power point tracking unit (MPPT).
The circuit reduces the dependence of the charging voltage on light intensity
and offers relatively stable operation when electrically stressed. The effects
of light intensity and the PV array size on the system and circuit efficiencies
as well as on PV utilization are investigated. A peak system efficiency of
18% is demonstrated. Although this is significantly lower than state-of-the-art
switch mode DC-DC voltage regulator and MPPTs, the combined use of thin-film
technology and low fabrication temperatures (below 150 °C allow its integration
within a wide range of mobile devices, making it an attractive solution for
energy harvesting systems.
© 2012 IEEE
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