A PZT-based energy harvester with working point optimization

De, S.; Montanini, Roberto; Panarello, S.; Quattrocchi, Antonino; Scimone, T.; Testa, A.

doi:10.1109/iccep.2017.8004767

Cited by 5 publications

(5 citation statements)

References 10 publications

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“…A more viable and general approach consists of adapting the duty cycle δ in order to force the PEH to always operate at its optimal working point. An MPPT algorithm, based on a perturb and observe (P&O) approach [ 32 ], was thus developed. The flow chart is displayed in Figure 9 a.…”

Section: Design Of Energy Harvesting Single-stage Convertermentioning

confidence: 99%

A New Approach for Impedance Tracking of Piezoelectric Vibration Energy Harvesters Based on a Zeta Converter

Quattrocchi

Montanini

et al. 2020

Sensors

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Piezoelectric energy harvesters (PEHs) are a reduced, but fundamental, source of power for embedded, remote, and no-grid connected electrical systems. Some key limits, such as low power density, poor conversion efficiency, high internal impedance, and AC output, can be partially overcome by matching their internal electrical impedance to that of the applied resistance load. However, the applied resistance load can vary significantly in time, since it depends on the vibration frequency and the working temperature. Hence, a real-time tracking of the applied impedance load should be done to always harvest the maximum energy from the PEH. This paper faces the above problem by presenting an active control able to track and follow in time the optimal working point of a PEH. It exploits a non-conventional AC–DC converter, which integrates a single-stage DC–DC Zeta converter and a full-bridge active rectifier, controlled by a dedicated algorithm based on pulse-width modulation (PWM) with maximum power point tracking (MPPT). A prototype of the proposed converter, based on discrete components, was created and experimentally tested by applying a sudden variation of the resistance load, aimed to emulate a change in the excitation frequency from 30 to 70 Hz and a change in the operating temperature from 25 to 50 °C. Results showed the effectiveness of the proposed approach, which allowed to match the optimal load after 0.38 s for a ΔR of 47 kΩ and after 0.15 s for a ΔR of 18 kΩ.

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Section: Design Of Energy Harvesting Single-stage Convertermentioning

confidence: 99%

A New Approach for Impedance Tracking of Piezoelectric Vibration Energy Harvesters Based on a Zeta Converter

Quattrocchi

Montanini

et al. 2020

Sensors

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“…Further tests will be carried out in order to investigate the behavior of the full-size buoy and of the energy harvesting system at sea. Finally, it is worth noting that the powers and, consequently, the energies harvested, could be increased while using specific interface circuits [ 29 ], impedance matching devices and strategies [ 30 , 31 ], and power tracking strategies [ 32 ].…”

Section: Discussionmentioning

confidence: 99%

Design and Performance Evaluation of a “Fixed-Point” Spar Buoy Equipped with a Piezoelectric Energy Harvesting Unit for Floating Near-Shore Applications

Alizzio

Bonfanti

Donato

et al. 2021

Sensors

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In the present work, a spar-buoy scaled model was designed and built through a “Lab-on-Sea” unit, equipped with an energy harvesting system. Such a system is based on deformable bands, which are loyal to the unit, to convert wave motion energy into electricity by means of piezo patch transducers. In a preliminary stage, the scaled model, suitable for tests in a controlled ripples-type wave motion channel, was tested in order to verify the “fixed-point” assumption in pitch and roll motions and, consequently, to optimize energy harvesting. A special type of structure was designed, numerically simulated, and experimentally verified. The proposed solution represents an advantageous compromise between the lightness of the used materials and the amount of recoverable energy. The energy, which was obtained from the piezo patch transducers during the simulations in the laboratory, was found to be enough to self-sustain the feasible on-board sensors and the remote data transmission system.

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“…In this way the described floating buoy assumes the configuration of a frequency transformer. For these reasons, the analyzed layout allows to considerably increase the power generated by a single PEH, compared to that obtainable in typical conditions [26], [27], especially if such harvesters are coupled to a suitable impedance matching circuit [22], [23].…”

Section: Discussionmentioning

confidence: 99%

“…The authors studied the correlation between the mechanical working frequency and the harvested electrical power, analysing the deflection shape of the PEH under operating conditions by means of a scanning laser-Doppler vibrometer. After that, they investigated the conversion efficiency of this PEH [21] and the applicability of a low-power single-stage converter, able to automatically follow the changes in the resistive component of the output impedance, in order to maximize the energy yield [22], [23].…”

Section: Introductionmentioning

confidence: 99%

Development and characterisation of a self-powered measurement buoy prototype by means of piezoelectric energy harvester for monitoring activities in a marine environment

2021

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In the interest of our society, for example in Smart City but also in other specific backgrounds, environmental monitoring is an essential activity to measure the quality of different ecosystems. In fact, the need to obtain accurate and extended measurements in space and time has considerably become relevant. In very large environments, such as marine ones, technological solutions are required for the use of smart, automatic, and self-powered devices in order to reduce human maintenance service. This work presents a simple and innovative layout for a small self-powered floating buoy, with the aim of measuring and transmitting the detected data for visualization, storage and/or elaboration. The power supply was obtained using a cantilever harvester, based on piezoelectric patches, converting the motion of ripple waves. Such type of waves is characterized by frequencies between 1.50 Hz and 2.50 Hz with oscillation between 5.0 ° and 7.0 °. Specifically, a dedicated experimental setup was created to simulate the motion of ripple waves and to evaluate the suitability of the proposed design and the performance of the used harvester. Furthermore, a dynamic analytical model for the harvester has been defined and the uncertainty correlated to the harvested power has been evaluated. Finally, the harvested voltage and power have shown how the presented buoy behaves like a frequency transformer. Hence, although the used cantilever harvester does not work in its resonant frequency, the harvested electricity undergoes a significant increase.

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A PZT-based energy harvester with working point optimization

Cited by 5 publications

References 10 publications

A New Approach for Impedance Tracking of Piezoelectric Vibration Energy Harvesters Based on a Zeta Converter

A New Approach for Impedance Tracking of Piezoelectric Vibration Energy Harvesters Based on a Zeta Converter

Design and Performance Evaluation of a “Fixed-Point” Spar Buoy Equipped with a Piezoelectric Energy Harvesting Unit for Floating Near-Shore Applications

Development and characterisation of a self-powered measurement buoy prototype by means of piezoelectric energy harvester for monitoring activities in a marine environment

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