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Récupération d'énergie mécanique pour vêtements autonomes connectés

Abstract : The functionalization of common objects in the human’s environment with electronics is a fast-growing trend, as demonstrated by the emblematic example of smartphones which became almost essential in the everyday life in less than a decade. One important stake of these systems is their power supply, in terms of ergonomics as well as resources: the use of electromechanical batteries to fuel billions of connected “things” is not the most attractive prospect. Energy harvesting techniques may provide an alternative or a complement to the use of these storage units. This thesis explores different structures of generators to efficiently convert the user’s mechanical energy to ensure the electrical self-sufficiency of smart wearables. Based on power requirement considerations for a typical “smart shirt” and comparing human energy harvesters from the literature, different structures are investigated. The first one is an inertial electromagnetic generator, the size of an AA-battery, designed to convert footsteps impacts. A thoroughly modelled and optimized device is able to generate power densities over 800µW/cm3 while attached on the arm during a run. The second considered energy harvester format is a “looped” inertial structure which is adapted to exploit the swing-type motions of the user’s limbs. This system is able to produce milliwatts-level powers from the motion of a small magnetic ball inside the device. Finally, a third generator concept that relies on electrostatic induction was developed, which uses variable capacitance structures to turn clothes deformations into electricity. The architecture of this energy harvester combines the triboelectric effect with a circuit of built-up self-polarization, Bennet’s doubler. It enables high levels of bias voltages without the need of an external source, and thus to maximize the energy generated per electrostatic cycle. A simple test device is shown to produce over 150µJ per cycle. This approach is promising in terms of integration in smart clothing, because it enables the development of flexible and stretchable devices well complying with the comfort requirements of worn systems. The comparison of those three energy harvesters provides an interesting basis for the future developments of energy harvesters converting one’s mechanical energy.
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Submitted on : Monday, March 5, 2018 - 5:15:50 PM
Last modification on : Tuesday, October 20, 2020 - 10:26:19 AM
Long-term archiving on: : Wednesday, June 6, 2018 - 4:29:04 PM


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  • HAL Id : tel-01723756, version 1



Matthias Geisler. Récupération d'énergie mécanique pour vêtements autonomes connectés. Electromagnétisme. Université Grenoble Alpes, 2017. Français. ⟨tel-01723756⟩



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