Dynamic switching conversion for piezoelectric energy harvesting systems

J. Emerg. Technol. Comput. Syst.

Dini

et al. 2015

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In the field of energy harvesting there is a growing interest in power management circuits with intrinsic sub-μA current consumptions, in order to operate efficiently with very low levels of available power. In this context, integrated circuits proved to be a viable solution with high associated nonrecurring costs and design risks. As an alternative, this article presents a fully autonomous and battery-less circuit solution for piezoelectric energy harvesting based on discrete components in a low-cost PCB technology, which achieves a comparable performance in a 32×43 mm 2 footprint. The power management circuit implements synchronous electric charge extraction (SECE) with a passive bootstrap circuit from fully discharged states. Circuit characterization showed that the circuit consumes less than 1μA with a 3V output and may achieve energy conversion efficiencies of up to 85%. In addition, the circuit is specifically designed for operating with input and output voltages up to 20V, which grants a significant flexibility in the choice of transducers and energy storage capacitors. . 2015. A sub-μA stand-by current synchronous electric charge extractor for piezoelectric energy harvesting. ACM

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Section: Peak Detector and Sece Control Unitmentioning

confidence: 99%

A Sub-μ A Stand-By Current Synchronous Electric Charge Extractor for Piezoelectric Energy Harvesting

J. Emerg. Technol. Comput. Syst.

Dini

et al. 2015

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“…Converters range from classical full wave rectifiers with an integrated boost converter [35] or with a switched capacitor converter [36] to complex waveform tracking algorithms [37]- [42]. Among the latter category, it is worth to mention synchronous electrical charge extraction (SECE) [12], [38]. The SECE converter, depicted in Fig.…”

Section: A Vibrational Energy Harvestingmentioning

confidence: 99%

“…Equation (4) determines t PHB with the assumption that the inductor current is approximated to a ramp and no losses occur while transferring an energy packet E CY from the inductor to the capacitor. A more accurate analytical analysis for SECE with PZ is provided in [38]. Fig.…”

Section: G Input Power Rangementioning

confidence: 99%

A Nanocurrent Power Management IC for Multiple Heterogeneous Energy Harvesting Sources

Dini

IEEE Trans. Power Electron.

et al. 2015

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This paper presents a fully autonomous power converter IC for energy harvesting from multiple and multi-type sources such as piezoelectric, photovoltaic, thermoelectric and RF transducers. The converter performs an independent selfadapting input power tracking process for each source. The peak power conversion efficiency measured during single-source operation is 89.6%. With all sources enabled, the intrinsic current consumption is as low as 47.9 nA/source. A self-starting battery-less architecture has been implemented in a 0.32 µm STMicroelectronics BCD technology with a 2142 µm x 2142 µm die area. The IC only requires a single shared inductor and an external storage capacitor for the basic working configuration. With respect to other multi-source energy harvesters, this design specifically introduces a series of nano-power design techniques for extreme minimization of the intrinsic consumption during operation. The small chip size combined with the limited number of required external component, the high conversion efficiency, and the state-of-the-art intrinsic nano-current consumption make the IC suitable for many critical applications with very limited available power such as wearable devices or unobtrusive wireless sensor networks.

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“…The corresponding energy is then transferred to the output storage capacitor by means of a second resonant circuit. SECE is reported to significantly increase the harvested power and to double the peak-to-peak transducer voltage with respect to an open circuit configuration [1] [2].…”

Section: Introductionmentioning

confidence: 98%

Quasi-synchronous Charge Extraction for Improved Energy Harvesting from Highly Coupled Piezoelectric Transducers

2014

Procedia Engineering

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