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Open AccessArticle

Resonant Rectifier ICs for Piezoelectric Energy Harvesting Using Low-Voltage Drop Diode Equivalents

Department of Electronics Engineering, Information and Communication System-on-Chip (SoC) Research Center, Kyung Hee University, Yongin 17104, Korea
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Academic Editor: Vittorio M. N. Passaro
Sensors 2017, 17(4), 901; https://doi.org/10.3390/s17040901
Received: 20 February 2017 / Revised: 15 April 2017 / Accepted: 17 April 2017 / Published: 19 April 2017
(This article belongs to the Section Physical Sensors)
Herein, we present the design technique of a resonant rectifier for piezoelectric (PE) energy harvesting. We propose two diode equivalents to reduce the voltage drop in the rectifier operation, a minuscule-drop-diode equivalent (MDDE) and a low-drop-diode equivalent (LDDE). The diode equivalents are embedded in resonant rectifier integrated circuits (ICs), which use symmetric bias-flip to reduce the power used for charging and discharging the internal capacitance of a PE transducer. The self-startup function is supported by synchronously generating control pulses for the bias-flip from the PE transducer. Two resonant rectifier ICs, using both MDDE and LDDE, are fabricated in a 0.18 μm CMOS process and their performances are characterized under external and self-power conditions. Under the external-power condition, the rectifier using LDDE delivers an output power POUT of 564 μW and a rectifier output voltage VRECT of 3.36 V with a power transfer efficiency of 68.1%. Under self-power conditions, the rectifier using MDDE delivers a POUT of 288 μW and a VRECT of 2.4 V with a corresponding efficiency of 78.4%. Using the proposed bias-flip technique, the power extraction capability of the proposed rectifier is 5.9 and 3.0 times higher than that of a conventional full-bridge rectifier. View Full-Text
Keywords: AC-DC converters; energy harvesting; piezoelectric; rectifier AC-DC converters; energy harvesting; piezoelectric; rectifier
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Din, A.U.; Chandrathna, S.C.; Lee, J.-W. Resonant Rectifier ICs for Piezoelectric Energy Harvesting Using Low-Voltage Drop Diode Equivalents. Sensors 2017, 17, 901.

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