Combined power extraction with adaptive power management module for increased piezoelectric energy harvesting to power wireless sensor nodes

This paper, for the first time, presents a combined power extraction with adaptive full analogue power management module (PMM) for increased piezoelectric energy harvesting. The PMM is adaptive to variations in the amplitude and frequency of vibration subjected to the piezoelectric strain energy harvester (SEH) and adaptive to different connected electrical loads, where it is used to power up a wireless sensor node (WSN). The combined power extraction circuit and adaptive PMM allow up to 156 % more power to be harvested from the SEH. The combined circuit harvested 0.55 mW at peak-to-peak strain loading of 200 με at 10 Hz. This feature is especially crucial under low frequency and low vibration amplitude conditions as it greatly improves the power generated from the SEH.