Review of Solar Energy Harvesting for IoT Applications

Solar energy harvesting has already widely used in IoT applications. This paper reviews the key technologies in solar energy harvesting systems. Comparing the characteristics of several typical DC-DC converters, charge pump, especially, kinds of reconfigurable charge pump are designed to decrease the voltage gain discrete and extend conversion ratio matching for MPPT techniques. Besides, more MPPT techniques are summarized to show that MPPT techniques have become developing from 1-D MPPT to 3-D MPPT. Multi-batteries storing the unstable and discontinuous energy has been paid more attention in energy harvesting systems. Modelling solar cell by ANN technique is prospected in later research in the field of milliwatt solar energy harvesting.