Self-startup soil energy harvesting system with a quick startup circuit

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This study presents a self‐sustainable soil energy harvesting system with a rapid startup circuit. The proposed system enables the operation from input voltage as low as 0.3 V, and to up‐convert the output to 3.3 V. The system is capable of extracting maximum power from the soil energy source. An efficient startup circuit that performs low initial charging time for a supercapacitor is presented. Experimental results show that the proposed system has a peak end‐to‐end efficiency of 58.48%. Also, the initial charging time of the supercapacitor is lowered by 2.54× as compared to the design without the startup circuit. The proposed system has been verified with off‐the‐shelf components.