By Philippe Basset, Elena Blokhina, Dimitri Galayko
Harvesting kinetic power is an efficient chance to energy instant sensor in a vibratory setting. along with classical equipment in line with electromagnetic and piezoelectric mechanisms, electrostatic transduction has a good standpoint particularly whilst facing small units in accordance with MEMS know-how. This e-book describes intimately the main of such capacitive Kinetic strength Harvesters in line with a spring-mass approach. particular issues relating to the layout and operation of kinetic strength harvesters (KEHs) with a capacitive interface are provided intimately: complex reports on their nonlinear positive factors, ordinary conditioning circuits and useful MEMS fabrication.
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Extra resources for Electrostatic kinetic energy harvesting
We propose to use this equivalence for the derivation of the current–voltage characteristic of the transducer. 5(b). 25]. Moreover, the basic electricity laws allow us to suppose that these two planes are conductive. 26] where d1 is the thickness of the air gap in the transducer, d1 = d0 − del . To determine the expression of Vt we can write: Vt (t) = Vvar − Vel = Q1 /Cvar − Q2 /Cel = 1 Q1 (1/Cvar + 1/Cel ) + Qel /Cel = Q Ct + Vel . 27] where Vel = Qel /Cel is the built-in voltage of the electret.
We can rewrite the above expression in another form. By deﬁnition, power is P = dA/dt = vF , where v is the velocity of the point where the force is applied, F is some force and A is the work done by the force F . 46] where Pdamper = −μx˙ 2 = −μv 2 is the power of the friction force. Note that Fdamping is a dissipative force and so Pdamper < 0 leading to the decrease of resonator energy. Mechanical Aspects of Kinetic Energy Harvesters: Linear Resonators 45 Finally, we can take into account the action of the transducer force, recalling its dissipative nature.
Remarks on mechanical forces At this stage, we would like to make a remark on the nature of mechanical forces in the context of energy conversion. In classical mechanics, a force describes an interaction between objects and it depends only on the position of the objects. Classical mechanics introduces a fundamental notion of potential (also called conservative) forces [LAN 76]. The work done by potential forces depends only on the starting and ending points x1 and x2 of the trajectory of a body and is independent of the shape of the trajectory.
Electrostatic kinetic energy harvesting by Philippe Basset, Elena Blokhina, Dimitri Galayko