An Autonomous Interface Circuit Based on Self-Investing Synchronous Energy Extraction for Low Power Piezoelectric Energy Harvesters

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Çiftci_2019_J._Phys.__Conf._Ser._1407_012043.pdf

Date

2019-12-04

Author

ÇİFTCİ, BERKAY
Chamanian, S.
Uluşan, H.
Külah, Haluk

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This paper presents a self-powered interface circuit to rectify and manage the AC output of the piezoelectric energy harvesters (PEH) by utilizing Self-Investing Synchronous Electric Charge Extraction technique (SI-SECE). The system invests charges from the battery to PEH to improve the electromechanical coupling factor and consequently the energy extraction by utilizing only one external component. The circuit was implemented in 180 nm CMOS technology where high voltage (HV) MOS transistors are utilized to tolerate high open circuit output voltages of PEHs. MEMS PEH with 4.7 nF inherent capacitance has been used to charge a 1 mu F storage capacitor. Proposed interface circuit extracts 18.55 mu W that is 33 % more than traditional SECE (13.95 mu W) for 250 Hz PEH excitation frequency and 2.3 V piezoelectric open circuit voltage amplitude. At the output power of 48.5 mu W, maximum power conversion efficiency of 62.4% is achieved as charge investment and corresponding conduction and switching losses on investing transistors. SI-SECE delivers power with 4.5x relative performance improvement over on-chip full-bridge rectifier.

Subject Keywords

General Physics and Astronomy

URI

https://hdl.handle.net/11511/42946

DOI

https://doi.org/10.1088/1742-6596/1407/1/012043

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Department of Electrical and Electronics Engineering, Conference / Seminar

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Citation Formats

B. ÇİFTCİ, S. Chamanian, H. Uluşan, and H. Külah, “An Autonomous Interface Circuit Based on Self-Investing Synchronous Energy Extraction for Low Power Piezoelectric Energy Harvesters,” 2019, vol. 1407, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42946.