A high energy dielectric-elastomer-amplified piezoelectric (DEAmP) to harvest low frequency motions

Mathew, Anup Teejo; Liu, Chong; Ng, TP; Koh, Soo Jin Adrian

doi:10.1016/j.sna.2019.05.015

Cited by 13 publications

(20 citation statements)

References 46 publications

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“…The use of piezoelectric materials, namely lead zirconate titanate (PZT) diaphragms and polyvinylidene fluoride (PVDF) films, have been demonstrated as a source of priming charges for DEGs. [112][113][114] The proposed designs include a mechanism that applies stress to the piezoelectric material when the DEG is in its stretched state, to generate charges that are then transferred onto the DEG. Piezoelectric materials on their own are used to convert mechanical energy into electrical energy (piezoelectric energy harvesters [115] ), but an hybrid generator combines the ability of the piezoelectric material to generate electrical charges with the ability of the DEG to increase the electrical potential of these charges.…”

Section: Priming Sourcesmentioning

confidence: 99%

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A Review of Dielectric Elastomer Generator Systems

Moretti

Rosset

Vertechy

et al. 2020

Advanced Intelligent Systems

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Dielectric elastomer generator systems (DEGSs) are a class of electrostatic softtransducers capable of converting oscillating mechanical power from different sources into usable electricity. Over the past years, a diversity of DEGSs has been conceived, integrated, and tested featuring diverse topologies and implementation characteristics tailored on different applications. Herein, the recent advances on DEGSs are reviewed and illustrated in terms of design of hardware architectures, power electronics, and control, with reference to the different application targets, including large-scale systems such as ocean wave energy converters, and small-scale systems such as human motion or ambient vibration energy harvesters. Finally, challenges and perspectives for the advancement of DEGSs are identified and discussed.

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Section: Priming Sourcesmentioning

confidence: 99%

“…Section 3.1.2) that produces an electric energy density 80% higher than that produced by the PZT alone. [ 113 ] In a further improvement, they replaced the harvesting circuit with a first‐order SPC (c.f. Section 3.2.1) and obtained a specific energy output 19 times higher than the PZT working alone.…”

Section: Electronicsmentioning

confidence: 99%

A Review of Dielectric Elastomer Generator Systems

Moretti

Rosset

Vertechy

et al. 2020

Advanced Intelligent Systems

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“…When the cross-sectional area of the fluid gradually increases, it is bound to cause the pressure to increase while the flow rate decreases. According to Equations (1) and (2), it can be seen that the boundary layer fluid should satisfy the following conditions when flow area gradually increases > 0 > 0 < 0…”

Section: Structural Principlementioning

confidence: 99%

“…As a functional material, piezoelectric ceramics play an irreplaceable role in modern intelligent industry [1][2][3]. Piezoelectric ceramics have been widely used in modern intelligent devices, such as pressure sensors [4], vibration energy collecting devices [5], intelligent wearable devices with human-computer interaction [6], and so on.…”

Section: Introductionmentioning

confidence: 99%

Design and Experimental Verification of a PZT Pump with Streamlined Flow Tubes

et al. 2019

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In this paper, a streamlined flow tube valveless piezoelectric pump (SLFT PZT pump) is proposed to modify the single flow trend and improve the fluid flow stability. Firstly, the structural and working principle of the streamlined flow tube, which accounts for changing the flow trend and improving the flow stability, were analyzed. The flow resistance and flow rate equations were established. Secondly, the pressure and velocity fields of the tube were simulated. These simulated results were consistent with the theoretical results. Thirdly, the flow resistance of the flow tube was tested with pressure differences of 1000 Pa, 1200 Pa, 1400 Pa and 1600 Pa respectively. The trend of the result curves was consistent with the simulated results. The amplitude-frequency relationship and the flow-rate-frequency relationship were also tested, both result curves highly corelate. The maximum amplitude was 0.228 mm (10 Hz, 120 V), and the maximum flow rate was 17.01 mL/min (10 Hz, 100 V). Finally, the theoretical flow rate of the SLFT PZT pump was calculated at 100 V and 120 V. These results roughly fitted with the experimental results. The streamlined flow tube could change the internal flow trend that remarkably improved the flow stability. Therefore, it promoted the application of the valveless PZT pump in living cells, biomedical and polymer delivery.

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“…Currently, there are two approaches to free the DEG from an external high-voltage electrical source: one, by coupling it with another motion-based energy harvester or two, to use an initial charge source with a self-priming circuit (SPC) that enables the DEG to prime itself so as to progressively amplify its voltage on each cycle (Ikegame et al, 2017; Illenberger et al, 2017; 2018; McKay et al, 2010a, 2010b, 2012; Mathew and Koh, 2018; Zanini et al, 2016). Electrets (Jean-Mistral et al, 2012, 2014; Lagomarsini et al, 2017; Vu-Cong et al, 2013a, 2013b) and piezoelectric generators (Alexandru et al, 2016; Clara et al, 2018; Mathew et al, 2019) are considered for the first approach. However, as electrical energy input scales with the square of the electric field ( ~ ε E 2 where ε is the permittivity of the DE), these motion-based energy harvesters cannot supply a high enough electric field that will optimize the energy output (Mathew et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

A self-amplifying dielectric-elastomer-amplified piezoelectric for motion-based energy harvesting

Mathew

Khanh

Aliffi

et al. 2019

Journal of Intelligent Material Systems and Structures

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The dielectric elastomer generator is a stretchable generator that converts low-frequency motions into electrical output, with excellent impedance matching capabilities. However, the dielectric elastomer requires an external high-voltage priming source to initialize its operation. We previously proposed a piezoelectric generator as the priming source, and demonstrated a net amplification of specific output energy of 1.8 times by the dielectric elastomer generator, as compared with that of the piezoelectric working in isolation. We termed our prototype the dielectric-elastomer-amplified piezoelectric (DEAmP). In this version, we introduce a self-priming circuit that will progressively charge up the dielectric elastomer generator to a much higher potential, thereby allowing the system to approach its optimized operating voltage. We term this the DEAmPx generator, with the letter “x” denoting progressive voltage/charge amplification by the self-priming circuit. The DEAmPx attained an output voltage of about 2000 V in 18 cycles and generates a dielectric elastomer generator–specific energy output of 3.1 mJ/g per cycle—19 times higher than that of the piezoelectric generator working in isolation. The system-specific energy output of DEAmPx is 0.49 mJ/g, with just a single layer of elastomer film. With this significantly larger output, we demonstrate the capability of a single-layer DEAmPx to power dielectric elastomer actuators.

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A high energy dielectric-elastomer-amplified piezoelectric (DEAmP) to harvest low frequency motions

Cited by 13 publications

References 46 publications

A Review of Dielectric Elastomer Generator Systems

A Review of Dielectric Elastomer Generator Systems

Design and Experimental Verification of a PZT Pump with Streamlined Flow Tubes

A self-amplifying dielectric-elastomer-amplified piezoelectric for motion-based energy harvesting

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