A Highly Efficient Ultralow Photovoltaic Power Harvesting System With MPPT for Internet of Things Smart Nodes


Implementing a monolithic highly efficient ultralow photovoltaic (PV) power harvesting system is pivotal for smart nodes of Internet of things (IOT) networks. This paper proposes a fully integrated harvesting system in 0.18- m CMOS technology. Utilizing a tiny business solar cell of 2.5 , the proposed system can offer 0–twenty nine W of power, which is much over the commonly used passive radio-frequency identification devices in IOT application. The hill-climbing maximum power purpose tracking algorithm is developed in an energy-efficient manner to tune the input impedance of the system and guarantee adaptive most power transfer below wide illumination conditions. The detailed impedance tuning approach is implemented with a capacitor worth modulation to eliminate the quiescent power consumption also to achieve the next efficiency than the traditional pulse-frequency modulation scheme. A supercapacitor is utilized for buffering, energy storing, and filtering functions, which permits additional functions of the IOT good nodes like active sensing and system-on-chip (SOC) Signal Processing. The output voltage ranges between 3.0 and three.five V for various device masses, like sensors, SOC, or wireless transceivers. The measured results ensure that this PV harvesting system achieves both ultralow operation capability beneath W and a self-sustaining efficiency of eighty nine%.

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