Impedance Coupled Voltage Boosting Circuit for Polyvinylidene Fluoride Based Energy Harvester

Lee, Kibae; Jeong, Yoonsang; Lee, Chong Hyun; Lee, Jongkil; Seo, Hee-Seon; Cho, Yohan

doi:10.3390/s23010137

Cited by 3 publications

(2 citation statements)

References 35 publications

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“…In order to realize the omnidirectional energy harvesting function through the 3D structure of the CSPEH-PB, we used the PVDF piezoelectric film with superior flexibility as the energy harvesting material in table 1. However, the PVDF piezoelectric film, which has a high internal impedance, has a large power conversion loss [28]. The power conversion efficiency of the CSPEH-PB can be indicated by the power density, which is defined as the ratio of the power and volume of the piezoelectric film.…”

Section: Resultsmentioning

confidence: 99%

A conical spiral piezoelectric energy harvester with parallel beams for all-directional flow energy harvesting

Ding,

Huang,

Zeng

et al. 2024

Smart Mater. Struct.

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Piezoelectric energy harvesting technology using flow-induced vibration is a type of interference-resistant and miniaturizable power generation technology, which is promising on powering the wireless micro electromechanical system (MEMS) in flow filed. However, the flow direction of the natural flow field is changeable while most existing flow-induced piezoelectric energy harvesters (PEHs) are limited by their working direction. In this paper, we propose a conical spiral piezoelectric energy harvester with parallel beams (CSPEH-PB) that can collect energy under flow excitation in all directions. Based on the multi-dimensional vibration analysis of conical spiral structure, we establish the dynamic model of the CSPEH-PB and investigate the differences between the CSPEH-PB and PEH with straight beam on the resonance bandwidth and effective flow velocity range through modal simulation. In comparative experiments with a bimorph flat PEH, we verify the effective flow velocity range and voltage of the CSPEH-PB and PVDF films attached. The results demonstrate that the CSPEH-PB generates an effective voltage greater than 0.53 V through the PVDF films under any direction of the water flow, and has a wider resonance bandwidth than PEH with straight beam. This study provides a practical solution for adapting PEHs to changeable flow direction.

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Section: Resultsmentioning

confidence: 99%

A conical spiral piezoelectric energy harvester with parallel beams for all-directional flow energy harvesting

Ding,

Huang,

Zeng

et al. 2024

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…Piezoelectric polymers, such as poly (vinylidene fluoride) (PVDF), offer natural flexibility and a low weight that makes them suitable for energy harvesting in portable and wearable applications compared to inorganic piezoelectric materials. PVDF has a high piezoelectric output for mechanical energy harvesting [ 19 , 20 ], but it requires additional poling to form the piezoelectric β−phase crystal [ 21 , 22 ]. Meanwhile, the possible biotoxicity and high cost due to large amounts of F elements in the backbone have limited further applications.…”

Section: Introductionmentioning

confidence: 99%

Synchronous Sound Recognition and Energy Harvesting by Flexible Piezoelectric PLLA/VB2 Composites

Zhang,

Liu,

Xue

et al. 2024

Polymers

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In the present study, poling−free PLLA/VB2 piezoelectric composites are fabricated to achieve synchronous sound recognition and energy harvesting. The addition of VB2 can interact with PLLA by intermolecular hydrogen bonding, inducing the dipole orientation of C=O in PLLA. Meanwhile, VB2 can promote crystallization of PLLA through heterogeneous nucleation. The combination of the two strategies significantly improves the piezoelectric performance of PLLA/VB2 composites. The PLLA/VB2 can detect the sound frequency with an accuracy of 0.1% in the range of 0–20 kHz to recognize characteristic sounds from a specific source. PLLA/VB2 can also convert sound into electrical energy synchronously with an energy density of 0.2 W/cm−3 to power up LEDs. Therefore, PLLA/VB2 shows great potential in the field of information and energy synchronous collection.

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DC Power Boosting Circuit for Freestanding‐Sliding Triboelectric Nanogenerators with High Intrinsic Impedance and Multi‐Harmonic Output

Lee,

Kim,

et al. 2024

Adv Materials Technologies

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This study presents a freestanding sliding triboelectric nanogenerator (FS‐TENG) designed for low‐frequency motions (below 2 Hz). However, for practical applications, an efficient power management strategy is required to handle the harmonic outputs of the FS‐TENG. The high‐frequency signal is not sustainable for powering low‐power electronic applications. To address the issue, a novel direct current power supply circuit (DPS) is proposed that utilizes a double charge circuit (DCC) and a comb filtering circuit (CFC) to efficiently harness harmonic sources from the FS‐TENG. The direct power supply (DPS) outperforms traditional converters by reducing the impedance of the FS‐TENG and collecting the target harmonic sources, which facilitates a continuous power supply to the load. The results demonstrate that the DPS is capable of providing a continuous DC voltage of 2.2 V to a 10 MΩ load with minimal ripple (0.039%) at a low operating frequency of 0.625 Hz. Additionally, the practical application of a self‐powered temperature sensor is demonstrated to highlight the potential of FS‐TENG and DPS for low‐frequency energy harvesting solutions in real‐world scenarios.

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Impedance Coupled Voltage Boosting Circuit for Polyvinylidene Fluoride Based Energy Harvester

Cited by 3 publications

References 35 publications

A conical spiral piezoelectric energy harvester with parallel beams for all-directional flow energy harvesting

A conical spiral piezoelectric energy harvester with parallel beams for all-directional flow energy harvesting

Synchronous Sound Recognition and Energy Harvesting by Flexible Piezoelectric PLLA/VB2 Composites

DC Power Boosting Circuit for Freestanding‐Sliding Triboelectric Nanogenerators with High Intrinsic Impedance and Multi‐Harmonic Output

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