Electrostatic kinetic energy harvesting by Philippe Basset, Elena Blokhina, Dimitri Galayko

By Philippe Basset, Elena Blokhina, Dimitri Galayko

Harvesting kinetic strength is an effective chance to strength instant sensor in a vibratory surroundings. in addition to classical equipment in line with electromagnetic and piezoelectric mechanisms, electrostatic transduction has an outstanding point of view particularly whilst facing small units according to MEMS know-how. This publication describes intimately the primary of such capacitive Kinetic power Harvesters in accordance with a spring-mass procedure. particular issues concerning the layout and operation of kinetic power harvesters (KEHs) with a capacitive interface are awarded intimately: complex reports on their nonlinear good points, common conditioning circuits and useful MEMS fabrication.

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3] (but does not affect the derivatives in the left-hand side). 4] n=1 where F˜0,n are the amplitudes of the harmonic components, ωext,n are their frequencies and φ0,n are their phases. 4] also describes the case of a periodic but not necessarily harmonic force. 4]. However, in the case of the Fourier series, we have to state that ωext,n = n · 2π/T , where T is the period of the periodic external force. 6] where γ = μ/(2m) is the dissipation (damping, friction) parameter and ω0 = k/m is the natural frequency of the resonator.

If one considers the vibration of a car or even the motion of a human body, the available mechanical energy is huge compared to the amount that can be harvested by a miniature harvester. g. a car), the harvested power must be negligible compared to the power generated from the “normal” operation of the ambient system. 38] is useless, since it will give zero efficiency in all cases. But what is the maximal input power that can ideally be extracted from the mechanical domain by a harvester? 37]. This maximum is independent of the technology used for electromechanical conversion.

17] where V is the voltage on the capacitor. As a result, an electrostatic force is applied to all parts of the capacitor whose geometric position impacts the value of the capacitance, namely the electrodes and the dielectric between the plates. The force is oriented in the direction of increasing the capacitance. What is the origin of the force? We propose first to discuss the origin of the force applied to the capacitor electrodes. By applying a voltage between two conducting 1 A force is a notion from mechanics, but sometimes in the literature the forces created by electrical phenomena are called “electrical forces”.

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