Energy harvesting circuit using variable capacitor for power systems

Florentino, Hélder R.; Freire, Raimundo C. S.; Catunda, S.Y.C.; Alan, V. S.; Atunda, Dimitri Galayko

doi:10.1109/imtc.2011.5944071

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…When it expands from the compressed state, again, the capacitance can change with a lower value, and the absorbed charge is released, showing a positive voltage output. Thus, a rubber‐based variable capacitor can be useful for converting mechanical energy into an electrical signal 45 …”

Section: Resultsmentioning

confidence: 99%

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Styrene–butadiene rubber‐based nanocomposites toughened by carbon nanotubes for wide and linear electromechanical sensing applications

Alam,

Kumar,

Lee

et al. 2023

Polymer Composites

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The contribution from specific interactions between rubber and filler sometimes plays a crucial role in the mechanical reinforcement and electromechanical sensitivities of rubber composites. This research explores the physical, mechanical, and electromechanical properties of styrene‐butadiene rubber (SBR) composites reinforced with carbon nanotubes (CNTs). Mechanical, thermodynamic, and scanning electron microscopy studies reveal that CNTs primarily enhance the mechanical properties through physical interactions with the rubber. Notably, π‐stacking interactions between the aromatic π‐electrons in SBR and the delocalized π‐electrons in CNTs contribute to significant improvements in mechanical strength. For instance, adding 4 phr (per hundred grams of rubber) of CNTs results in an impressive 871% increase in fracture toughness compared to unfilled rubber. These composites also exhibit remarkable stress and strain improvements even with small amounts of CNTs, making them suitable for robust strain sensing applications. Specifically, the composite containing 3 phr of CNTs demonstrates superior strain sensitivity (2.87 < GF < 48.62), a wide detection range (0% < Δε < 187%), and excellent linearity (0.927 < R2 < 0.995). Lower CNT content enhances sensitivities but reduces overall linearity, while higher CNT content improves linearity but decreases sensitivity. Moreover, these composites perform exceptionally well under compressive forces, even at a 0.5 N applied force. Given their excellent response to mechanical forces and strain, these composites hold promise for applications like electronic skin, strain sensors, and energy‐harvesting devices.Highlights Carbon nanotubes (CNTs) were used as reinforcing fillers in SBR composites. CNTs significantly improve physical, mechanical, and electrical properties. Primarily, π‐stacking may be involved in enhancing these properties. The composites exhibit strong strain and force‐sensing capabilities. These composites could be valuable for wearable electronics in the future.

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Section: Resultsmentioning

confidence: 99%

“…Thus, a rubber-based variable capacitor can be useful for converting mechanical energy into an electrical signal. 45 The single electrode-based energy harvesting setup can be found in Figure 10A. Mechanical load was applied to the round-shaped portion of the 0.2 mm thick electrode with a movable tip attached to the UTM.…”

Section: Applicationsmentioning

confidence: 99%

Styrene–butadiene rubber‐based nanocomposites toughened by carbon nanotubes for wide and linear electromechanical sensing applications

Alam,

Kumar,

Lee

et al. 2023

Polymer Composites

View full text Add to dashboard Cite

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“…In this study we have chosen the charge pump with resistive flyback [14] for three reasons: i) it implements a rectangular QV cycle, ii) by accurately choosing the resistive load this configuration can model the behaviour of the charge pump with inductive flyback [10], [15], [16] or of the Bennet's doubler, and iii) it is suitable for analytical analysis. Therefore, while this article is presented in terms of the charge pump conditioning circuit, the analysis is universal to all conditioning circuits implementing the rectangular QV cycle.…”

Section: Introductionmentioning

confidence: 99%

Capacitive Energy Conversion With Circuits Implementing a Rectangular Charge-Voltage Cycle Part 2: Electromechanical and Nonlinear Analysis

O'Riordan

Dudka

Galayko

et al. 2015

IEEE Trans. Circuits Syst. I

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Efficient circuit design for low power energy harvesting

et al. 2020

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We present five circuit topologies for low power energy harvesting. The most efficient circuit uses a variable capacitor as the power source, a DC bias voltage to charge the variable capacitor, two transistors for rectification, and two storage capacitors. Varying the capacitance performs work and results in stored charge in the capacitors. We experimentally measure the storage capacitor voltage and current over time. The circuit efficiency nears 50% at a maximum power of 10 nW. Multiple circuit topologies are simulated and yield efficiencies from 15% to 50%.

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Energy harvesting circuit using variable capacitor for power systems

Cited by 4 publications

References 5 publications

Styrene–butadiene rubber‐based nanocomposites toughened by carbon nanotubes for wide and linear electromechanical sensing applications

Styrene–butadiene rubber‐based nanocomposites toughened by carbon nanotubes for wide and linear electromechanical sensing applications

Capacitive Energy Conversion With Circuits Implementing a Rectangular Charge-Voltage Cycle Part 2: Electromechanical and Nonlinear Analysis

Efficient circuit design for low power energy harvesting

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