Analysis of Electrostatic Energy Harvesters Electrically Configured as Bennet’s Doublers

Truong, Binh Duc; Le, Cuong Phu; Halvorsen, Einar

doi:10.1109/jsen.2017.2723571

Cited by 16 publications

(13 citation statements)

References 31 publications

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“…Using the derived electromechanical model in Eq. ( 17), with the physical and geometrical parameters presented in [37] , we fit the numerical results of the capacitances with those measured experimentally by adjusting the restitution and damping coefficients. Fig.…”

Section: Model Validationmentioning

confidence: 99%

A new type of triboelectric nanogenerator with self-actuated series-to-parallel electrical interface based on self-synchronized mechanical switches for exponential charge accumulation in a capacitor

et al. 2019

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Section: Model Validationmentioning

confidence: 99%

A new type of triboelectric nanogenerator with self-actuated series-to-parallel electrical interface based on self-synchronized mechanical switches for exponential charge accumulation in a capacitor

et al. 2019

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“…To be specific, the overlap-varying transducers configured as Bennet’s doubler represented in Figure 10 is investigated. An analytical solution (utilizing mathematically-idealized diode model) developed in [21] shows that: Vnormala and Vnormalb can be captured by Direct Current (DC) offset sinusoidal signals when the doubler circuit reaches saturation. For the static pull-in instability analysis, the DC offset voltages on CnormalA and CnormalB are considered and respectively expressed as VA=Vnormals1+54, VB=Vnormals3+54, where Vnormals is the saturation DC voltage at output.…”

Section: Analysis Of a Comb-drive Harvesters With Two Anti-phase Cmentioning

confidence: 99%

“…In a critical condition, when the electrostatic force exceeds the mechanical restoring force, a small disturbance could lead to collapsing of the movable fingers to the fixed ones. This restriction is more critical when the MEMS transducer is electrically configured as Bennet’s doubler or voltage multiplier [7,8]. Design of comb-drive devices, therefore, requires a comprehensive analysis of a pull-in effect since the travel range and device performance are severely limited by the inherent instability.…”

Section: Introductionmentioning

confidence: 99%

On the Lateral Instability Analysis of MEMS Comb-Drive Electrostatic Transducers

Truong

Halvorsen

2019

Sensors

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This paper investigates the lateral pull-in effect of an in-plane overlap-varying transducer. The instability is induced by the translational and rotational displacements. Based on the principle of virtual work, the equilibrium conditions of force and moment in lateral directions are derived. The analytical solutions of the critical voltage, at which the pull-in phenomenon occurs, are developed when considering only the translational stiffness or only the rotational stiffness of the mechanical spring. The critical voltage in a general case is numerically determined by using nonlinear optimization techniques, taking into account the combined effect of translation and rotation. The influences of possible translational offsets and angular deviations to the critical voltage are modeled and numerically analyzed. The investigation is then expanded for the first time to anti-phase operation mode and Bennet’s doubler configuration of the two transducers.

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“…Based on contact electrification coupling with the electrostatic induction, − the TENGs have a significant high-voltage output, which can be thousands of volts, but the charge output of the TENGs is very low, usually within 30 μC m –2 . The bennet’s doubler as proposed in the former research − has been demonstrated to greatly enhance the charge output of the TENGs, and a series-parallel conditioning circuit has been developed based on the bennet’s doubler theoretically, which can be used for the electrostatic energy harvesting as a charge pump, but there is no experimental demonstration . However, these previous studies ignored the breakdown effect, which universally exists in TENGs and suppresses the charge output due to the electrostatic discharging; − therefore the optimized output performance of the TENG is still subject to further studies.…”

Section: Introductionmentioning

confidence: 99%

Inductor-Free Output Multiplier for Power Promotion and Management of Triboelectric Nanogenerators toward Self-Powered Systems

Xia

Wang

Basset

et al. 2020

ACS Appl. Mater. Interfaces

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The output voltage of triboelectric nanogenerators (TENGs) is much higher than the overload capacity of most commercial electronics, making it hard to power them directly; so the power-management solution is indispensable. In the meanwhile, it is critical for practical applications to enhance the output performance of the TENG toward its breakdown limit, which is usually ignored before. Here, an inductor-free output multiplier (OM) for power promotion and management of TENGs is proposed, with the breakdown effect considered. This OM, as expanded based on bennet’s doubler, is theoretically studied and experimentally demonstrated to significantly enhance the output performance of the TENG within only a few working cycles. The charge output was enhanced by 7.6 times experimentally with the OM. An external capacitor and a switch are applied to realize a high energy extraction ratio of up to 196%, with the average charge output per cycle of ∼3–3.75 μC achieved. This OM circuit with the smart switch is suitable for power promotion of TENGs with variable capacitance and for power management of all TENGs. The OM circuit is demonstrated to ensure the high output performance of TENGs even at a low triboelectric charge density, which is crucial for broad applications of the TENG toward self-powered systems, potentially to be a solution for improving the output performance of TENGs working in harsh environments.

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Analysis of Electrostatic Energy Harvesters Electrically Configured as Bennet’s Doublers

Cited by 16 publications

References 31 publications

A new type of triboelectric nanogenerator with self-actuated series-to-parallel electrical interface based on self-synchronized mechanical switches for exponential charge accumulation in a capacitor

A new type of triboelectric nanogenerator with self-actuated series-to-parallel electrical interface based on self-synchronized mechanical switches for exponential charge accumulation in a capacitor

On the Lateral Instability Analysis of MEMS Comb-Drive Electrostatic Transducers

Inductor-Free Output Multiplier for Power Promotion and Management of Triboelectric Nanogenerators toward Self-Powered Systems

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