SIMULTANEOUS MULTI-SOURCE INTEGRATED ENERGY HARVESTING SYSTEM FOR IOE APPLICATIONS

Abstract

Summary: This work presents an integrated modular multi-source energy harvesting system based on the Dickson charge pump and hill-climbing algorithm. The proposed maximum output power extraction is optimizing the system’s end- to-end efficiency. It collects the power simultaneously from multiple energy sources and boosts their DC voltages to a regulated output voltage that can be used for Internet of Everything (IoE) applications. The proposed imple- mentation utilizes the whole on-chip capacitance regardless of the number of stages in use. A demonstration system using the proposed techniques is implemented for two sources in 0.18 µm CMOS technology and it utilizes a total of 900 pF MIM capacitance. The simulation results show that the proposed system achieves a peak MPPT efficiency of 90%, charge pump efficiency of 70%, and end-to-end efficiency of 55% at a regulated output voltage of 1.5 V.