Commissariat a L'energie Atomique Et Aux Energies Alternatives

Bouhadjar Ahmed Seddik

Ghislain Despesse

Emmanuel Defay

An apparatus for converting vibratory mechanical energy into electrical energy includes a mobile mass, a support, first and second beams, the second being piezoelectric, and a junction element. The first beam extends longitudinally between the support and the mass, each of which has a beam end embedded therein. The second beam links the support and the mobile mass. Its elongation stiffness is lower than that of the first beam. The junction element extends between the beams. A first assembly, with a first bending stiffness, comprises the first beam, the second beam, and the junction element. A second assembly consists of the first assembly minus the second beam. Its bending stiffness is less than or equal to half of that of the first assembly.

Optimized device for converting mechanical energy into electrical energy

An apparatus for converting mechanical vibration energy into electrical energy includes a converter that, when subjected to vibrations, generates an electrical potential difference, and an electrical circuit connected to terminals of the converter. The circuit includes a first arm and a second arm parallel to the first warm. The first arm has a first variable-capacitance capacitor system. The second arm includes an electrical load to be powered. A second variable-capacitance capacitor is series-connected with the electrical load. A control circuit is configured to modify respective capacitance values of the first and second capacitor systems so as to modify the converter's mechanical resonance frequency.

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Valence, France

Bouhadjar Ahmed Seddik