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Open AccessArticle

A Piezoelectric Harvesting Interface with Capacitive Partial Electric Charge Extraction for Energy Harvesting from Irregular High-Voltage Input

Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
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Energies 2020, 13(8), 1939; https://doi.org/10.3390/en13081939
Received: 18 March 2020 / Revised: 3 April 2020 / Accepted: 13 April 2020 / Published: 15 April 2020
(This article belongs to the Section State-of-the-Art Energy Related Technologies)
A fully integrated piezoelectric energy harvesting interface is proposed for harvesting energy from irregular human motion. To handle irregular pulse inputs generated by the piezoelectric transducer (PZT), the proposed harvesting interface includes a wake-up controller that activates the harvesting interface only when human motion is detected and deformation is applied on the piezoelectric material, thereby keeping static power loss low. The PZT output voltage is increased to its peak voltage by removing any type of external load capacitance seen by the PZT during its deformation. Once the peak voltage is detected, a multi-voltage conversion-ratio-based switched-capacitor circuit is activated to transfer PZT-generated energy to the battery in multiple ratio steps to maximize the conversion efficiency, with the help of a carefully designed harvesting controller. To deal with open-circuit voltages (VOCS) higher than the maximum voltage tolerated (VMAX) by available technology, capacitive partial electric charge extraction is activated every time the PZT output voltage approaches the VMAX. The proposed harvesting interface extracts 3.37 times more energy than a conventional full-bridge rectifier-based harvesting scheme. View Full-Text
Keywords: energy harvester; piezoelectric generator; harvesting interface; high-voltage harvesting; capacitive partial electric charge extraction energy harvester; piezoelectric generator; harvesting interface; high-voltage harvesting; capacitive partial electric charge extraction
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MDPI and ACS Style

Khan, M.B.; Saif, H.; Lee, Y. A Piezoelectric Harvesting Interface with Capacitive Partial Electric Charge Extraction for Energy Harvesting from Irregular High-Voltage Input. Energies 2020, 13, 1939. https://doi.org/10.3390/en13081939

AMA Style

Khan MB, Saif H, Lee Y. A Piezoelectric Harvesting Interface with Capacitive Partial Electric Charge Extraction for Energy Harvesting from Irregular High-Voltage Input. Energies. 2020; 13(8):1939. https://doi.org/10.3390/en13081939

Chicago/Turabian Style

Khan, Muhammad B.; Saif, Hassan; Lee, Yoonmyung. 2020. "A Piezoelectric Harvesting Interface with Capacitive Partial Electric Charge Extraction for Energy Harvesting from Irregular High-Voltage Input" Energies 13, no. 8: 1939. https://doi.org/10.3390/en13081939

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