Device for converting mechanical energy into electrical energy operating over an extended range of vibration frequencies

A device for converting mechanical energy into electrical energy including a support, a structure extending along a longitudinal direction, said structure being suspended to the support through embedding by a first longitudinal end,

• Said structure including:
• a mass fastened to a second longitudinal end,
• at least one layer of piezoelectric material at least partly extending between the first longitudinal end and the second longitudinal end of the structure and disposed so that, when the mass moves in a direction orthogonal to the longitudinal direction, the layer is flexurally deformed, electrodes on either side of the layer of piezoelectric material,
• transverse elements integral with the layer of piezoelectric material extending transversely relative to the longitudinal direction over a length at least equal to half the transverse dimension of the layer of piezoelectric material,
• a beam including a central plate a longitudinal end of which is embedded into the support, and another longitudinal end of which carries the mass, said the transverse elements being fastened to at least one face of the central plate, the at least one layer of piezoelectric material being fastened to the edges of the transverse elements.