Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 29, Issue 2, Pages 729-739Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2013.2257856
Keywords
Energy harvesting; micropower design; piezoelectric arrays; piezoelectric transducers; synchronous charge extraction
Categories
Funding
- European Community [Nanofunction 257375]
- ENIAC-JU [END 120214]
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This paper presents a self-powered energy harvesting circuit based on synchronous charge extraction with a single shared inductor for power conversion from arrays of independent piezoelectric transducers. The number of handled elements can be easily increased at the expense of few additional components and without affecting performance. The energy harvesting circuit was characterized with three 0.5 x 12.7 x 31.8 mm(3) piezoelectric cantilevers subject to different types of vibrations. Throughout all operating conditions, the circuit was able to extract the maximum power independently from every transducer. Compared to passive energy harvesting interfaces, the output power is significantly higher, with worst-case increases ranging from +75% to +184%. The circuit starts up passively and is based on ultralow power active control, which consumes during operation at 3 V a fraction of the extra harvested power as low as 10 mu W per source. As part of the best tradeoff between harvested and intrinsic power, an overall energy efficiency up to 74% was achieved.
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