Effect of nonlinear external circuit on electrostatic damping force of micro electret generator

Miki, Daigo; Suzuki, Yuji; Kasagi, Nobuhide

doi:10.1109/sensor.2009.5285405

Cited by 18 publications

(20 citation statements)

References 12 publications

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“…The peak value of the power output increases with amplitude. The experimental data for different oscillation amplitudes are in good agreement with the numerical results, indicating the validity of the present generator model [45–47].…”

Section: Electret Generator Modelsupporting

confidence: 70%

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Recent progress in MEMS electret generator for energy harvesting

Suzuki

2011

IEEJ Transactions Elec Engng

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360

191

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Energy harvesting is a method by which energy naturally present in the environment is captured and then converted into electricity for use in low‐power electronics. Among the various energy sources, structural vibration is believed to be useful for powering wireless sensors in various applications such as sensor network and structural health monitoring. In the present paper, after a brief introduction to electret materials and charging technologies, recent progress in microelectromechanical systems (MEMS) electret generators is reviewed. © 2011 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Section: Electret Generator Modelsupporting

confidence: 70%

“…13(b)). Thus, with this arrangement, the unidirectional Coulomb force is almost cancelled out, and F e becomes proportional to the mass velocity [47], which is classified as VDRG.…”

Section: Electret Generator Modelmentioning

confidence: 99%

Recent progress in MEMS electret generator for energy harvesting

Suzuki

2011

IEEJ Transactions Elec Engng

Self Cite

360

191

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“…Indeed, the converted power for the primitive conditioning circuit roughly increases with the square of the electret voltage, whereas the unstable auto-synchronous conditioning circuit uses its voltage as a pre-charge to reach a maximal power point at a higher voltage. Furthermore, the advantage of the unstable conditioning circuit configuration over the primitive circuit is transitive to diode-bridge rectifierbased conditioning circuits such as the circuit used in [8]. Indeed, the maximal converted power for these circuits is also proportional to the square of the electret voltage.…”

Section: Resultsmentioning

confidence: 99%

Electrostatic vibration energy harvester using an electret-charged mems transducer with an unstable auto-synchronous conditioning circuit

Karami

Basset

Galayko

2015

J. Phys.: Conf. Ser.

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A new autostabilization mechanism in the Bennet doubler circuit-based electrostatic vibrational energy harvester V.P. Abstract.This paper reports for the first time experiments using an electrostatic vibration energy harvester comprised of a low voltage electret-charged MEMS transducer joined to an unstable autosynchronous conditioning circuit with rectangular charge-voltage characteristic, also known as the Bennet's doubler conditioning circuit. The experimental results show that the electret voltage, even if of low value, can be used as the necessary pre-charge for these type of electrostatic vibration energy harvesters. Also, the use of such a conditioning circuit with a low-voltage electret capacitive MEMS tranducer instead of the previously-reported conditioning circuits with direct connection to load or through a rectifier, can be advantageous in terms of maximal harvested power for a low-voltage electret, showing up to 95% higher converted power. IntroductionIn the recent years, extensive research has been done on electret-based electrostatic vibration energy harvesters (e-VEHs). High-voltages electret have enabled the realization of e-VEHs with relatively high harvested power density from relatively high-gap and/or in-plane moving electrode capacitive transducers [1]. These electret e-VEHs have been experimentally tested using either a direct connection to an impedance-matched load -also known as the primitive conditioning circuit -, or simple conditioning circuits consisting of a diode bridge connected to an impedance-matched load, with or without the use of a smoothing capacitor.However, electrets may be subject to degradation resulting in the decrease of their built-in voltage over time. This problem is strongly linked to the materials and the technology used to implement the charged electret layer. As the electret voltage decreases, so does the converted power if using the previously-mentioned conditioning circuits.Notwithstanding this decrease of the electret built-in voltage, recently, a new class of conditioning circuits was discovered: inspired from the "Bennet's doubler of electricity", they allow an exponential self-increase of their biasing, and thus of the converted power, at the small cost of a low pre-charge voltage. In the electrical domain, these circuits show no saturation of the harvested power over time of operation. Moreover, these circuits are inductorless and do not require any external command for synchronization [2,3]. This paper presents the first experiment combining the Bennet's doubler conditioning circuit, which will be called the unstable auto-synchronous conditioning circuit in the rest of the paper,

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“…Miki et al [38] developed an electret power generator driven by electromechanical vibration. The experimental data were directly compared with the model characteristics.…”

Section: Continuous Electret Based Systemsmentioning

confidence: 99%