By Philippe Basset, Elena Blokhina, Dimitri Galayko
Harvesting kinetic power is an effective chance to energy instant sensor in a vibratory setting. in addition to classical equipment in response to electromagnetic and piezoelectric mechanisms, electrostatic transduction has a good standpoint specifically whilst facing small units in response to MEMS expertise. This booklet describes intimately the main of such capacitive Kinetic strength Harvesters in keeping with a spring-mass approach. particular issues with regards to the layout and operation of kinetic power harvesters (KEHs) with a capacitive interface are awarded intimately: complicated reviews on their nonlinear gains, usual conditioning circuits and functional MEMS fabrication.
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Extra info for Electrostatic Kinetic Energy Harvesting (Iste)
One possible solution is the use of a differential capacitive transducer. However, while differential structures are often used for sensing/actuating applications, they are rarely used in energy harvesting devices. 3. Capacitive transducers biased by an electret layer The capacitive transducers presented so far are passive devices: they need to be biased in order to generate electricity. For this reason, sometimes a layer of dielectric with embedded electrical charges called electret is added to the transducer.
Note that the overdot denotes the derivative with respect to time. Everywhere in this Electrostatic Kinetic Energy Harvesting, First Edition. Philippe Basset, Elena Blokhina and Dimitri Galayko. © ISTE Ltd 2016. Published by ISTE Ltd and John Wiley & Sons, Inc. 28 Electrostatic Kinetic Energy Harvesting chapter, we assume that Fext = Fext (t), x = x(t) and v = v(t). We will omit the notation of the dependence on time for simplicity. 1. 2] is one of most commonly used in the analysis of KEH resonators and is extremely common in research literature.
Energy conversion with a capacitive transducer The work of the force generated by the capacitive transducer represents the energy transferred between the mechanical and the electrical domains. Suppose that during a time interval [t1 , t2 ] the capacitance Ct of a transducer changes monotonically. The work produced by the force of the transducer is given by: t2 Wt = t2 Ft vdt = t1 t1 1 2 dCt dx V dt = 2 t dx dt C2 C1 1 2 V dCt , 2 t where C1 = Ct (t1 ), C2 = Ct (t2 ), v is the velocity of the mobile electrode.