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Communication Dans Un Congrès Année : 2015

Interface Circuit for Vibration Energy Harvesting with Adjustable Bias Voltage

Résumé

This paper presents a new interface circuit for electrostatic vibration energy harvesting with adjustable bias voltage. An electronic switch is used to modify the circuit configuration so that the harvested energy increases the voltage across a biasing capacitor. Decrease of this biasing capacitor voltage occurs naturally due to the circuit imperfections. Such a control of the bias voltage enables to adjust the amount of energy converted by the variable capacitor on each cycle. This feature can be used to optimize the mechanical damping induced by the energy conversion process in order to maximize the harvested power. Another feature of this interface circuit is that it is capable to get high bias voltage whatever the battery voltage with low energy loss. 1. Introduction Energy harvesting is a promising way of generation of electrical supply for powering miniature device, like those used in wearable electronics, medical implants and wireless sensor networks. Mechanical vibration is a common and well known energy source. Mechanical vibration energy harvesting concept consists in converting the energy of the parasitic ambient mechanical vibration into the useful electrical energy. Among several types of Vibration Energy Harvester (VEH), such as electromagnetic, piezoelectric, electrostatic, etc, Electrostatic Vibration Energy Harvesters (e-VEH) appears to be promising for miniaturization. An e-VEH is actually based on a variable capacitor whose moving electrode is actuated by ambient vibrations. Such electromechanical device can be profitably miniaturized using MEMS technology. One of the main challenges of e-VEH implementation is the design of the interface circuit, whose power efficiency is a critical issue. Recently, several interface circuits without switches and inductive components have been proposed [1-4], whose simplicity enables efficient standalone implementation. However, as shown by Dhorziev et al., these circuits do not intrinsically optimize the system performances: there exists an optimal power supply voltage at which output power is maximum [5]. Such optimization can be performed using Yen's circuit [6], but in a limited way because of the limited achievable voltage range. The interface circuit presented here can theoretically generate voltages across the variable capacitor without upper limit, enabling to get high bias voltages whatever the battery voltage. Dragunov et al.
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Dates et versions

hal-01735894 , version 1 (16-03-2018)

Identifiants

  • HAL Id : hal-01735894 , version 1

Citer

J Wei, Elie Lefeuvre, H. Mathias, François Costa. Interface Circuit for Vibration Energy Harvesting with Adjustable Bias Voltage. PowerMEMS 2015, Dec 2015, Boston, United States. ⟨hal-01735894⟩
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