A Self-Powered and Optimal SSHI Circuit Integrated With an Active Rectifier for Piezoelectric Energy Harvesting

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This paper presents a piezoelectric energy harvest-which integrates a Synchronized Switch Harvesting on Inductor (SSHI) circuit and an active rectifier. The major design challenge of the SSHI method is flipping the capacitor voltage at optimal times. The proposed SSHI circuit inserts an active diode on each resonant loop, which ensures flipping of the capacitor voltage at optimal times and eliminates the need to tune the switching time. The diodes of the SSHI circuit are also used as a rectifier to further simplify the controller. The key advantage of the proposed circuit is a simple controller, which leads to low power dissipation of the proposed circuit to result in high efficiency. The proposed circuit isself-powered and capable of starting even when the battery is completely drained. The circuit was fabricated in BiCMOS 0.25 mu m technology with a die size of 0.98 x 0.76 mm(2). Measured results indicate that the proposed circuit increases the amount of power harvested from a piezoelectric cantilever by 2.1 times when compared with a full bridge (FB) rectifier and achieves a power conversion efficiency of 85%. The proposed circuit dissipates about 24 mu W while the controller alone only 1.5 mu W.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2017-03
Language
English
Article Type
Article
Keywords

ELECTRIC CHARGE EXTRACTION; INTERFACE CIRCUIT; CONVERSION; INDUCTOR

Citation

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, v.64, no.3, pp.537 - 549

ISSN
1549-8328
DOI
10.1109/TCSI.2016.2608999
URI
http://hdl.handle.net/10203/223529
Appears in Collection
EE-Journal Papers(저널논문)
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