A Fully Integrated Storage-Free Energy Harvesting System With Voltage Self-Regulation and Dual-Channel Power Extraction
A Fully Integrated Storage-Free Energy Harvesting System With Voltage Self-Regulation and Dual-Channel Power Extraction
Abstract:
With the growing demand for self-powered oper-ation in Internet of Things (IoT) nodes and microsensors, photovoltaic energy harvesting (EH) systems have become a key research focus. Although triple-well on-chip solar cells improve photovoltaic conversion efficiency, their multiport output char-acteristics pose design challenges: conventional parallel output schemes cannot address the mismatch in maximum power point (MPP) voltages among ports, thereby limiting energy extraction efficiency. Moreover, fully integrated EH systems lack external storage, and input–output coupling renders traditional voltage regulation unsuitable. To address these challenges, this arti-cle presents a fully integrated dual-channel EH system that employs a dual-port, independently boosted parallel architecture combined with a frequency-driven lightweight self-regulation mechanism, eliminating the need for conventional regulators. Measurement results show that the system achieves a stable out-put voltage of approximately 1.22 V, a peak end-to-end efficiency of 63.97%, and a 6.31% improvement in maximum output power, while also exhibiting reliable start-up and ripple suppression, providing valuable guidance for the design of efficient power extraction and self-regulation in on-chip photovoltaic EH systems.
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A Fully Integrated Storage-Free Energy Harvesting System With Voltage Self-Regulation and Dual-Channel Power Extraction
