Abstract: The present disclosure relates to a method of tuning an electric charge extraction circuit of a vibrational energy harvester having a mechanical resonator, the method comprising varying, during a first phase, first and second parameters (?1,?2) of the electric charge extraction circuit based on detected harvested power (PHARVEST), each of the first and second parameters (?1,?2) influencing the amount of damping of the mechanical resonator and at least the first parameter (?1) influencing the resonance frequency of the mechanical resonator, wherein the first and second parameters (?1,?2) are varied during the first phase such that the amount of damping remains constant or varies by less than a first significant amount and the resonance frequency reaches a final level.

Abstract: A device for recovering or dampening vibratory energy from a mechanical resonator, comprising: an electrical generator comprising an element for converting mechanical vibration energy into electrical charges coupled to the resonator, the electrical generator periodically transferring a portion of the electrical charges from one terminal of the conversion element to the other; a frequency variation to phase variation conversion device, comprising an injection-locked oscillator of which the free-running oscillation frequency is equal to the resonance frequency of the resonator, and supplying to the electrical generator a control signal of frequency equal to that of the signal outputted by the conversion element and of which the phase shift depends on the difference between the frequency of the signal outputted by the conversion element and the resonance frequency of the resonator.

Abstract: A piezoelectric generator including: a piezoelectric element; a circuit for shorting and placing in open circuit the piezoelectric element; and an inductive converter.

Abstract: The present disclosure concerns a mechanical vibration energy device including an assembly of spring blades between two points and at least two masses respectively on either side of the blade assembly, wherein the blade assembly is buckled between the two points by the bringing of the masses towards each other.

Abstract: The present disclosure concerns a mechanical vibration energy harvesting device including a bistable spring blade structure in a frame, and a sliding joint at the level of a wall of the frame between said structure and at least one mechanical-to-electrical device external to the frame.

Abstract: A device for converting mechanical energy into electrical energy including a support (2), a structure (S1) suspended to the support through embedding by a first longitudinal end (4.1) and including a mass (M) fastened to a second longitudinal end (4.2), two layers of piezoelectric material (12, 14) extending between the first longitudinal end (4.1) and second longitudinal end (4.2) of the structure (S1) and disposed so that, when the mass (M) moves, the layers are flexurally deformed, electrodes (E1, E2) on either side of the layer of piezoelectric material (12, 14), wherein the structure (S1) includes transverse elements (16, 18) integral with the layers of piezoelectric material (12, 14) extending transversely relative to the longitudinal direction (X) of the structure over a length at least equal to half the transverse dimension (L) of the layers of piezoelectric material (12, 14).

Abstract: The present disclosure relates to a method of tuning an electric charge extraction circuit of a vibrational energy harvester having a mechanical resonator, the method comprising varying, during a first phase, first and second parameters (?1,?2) of the electric charge extraction circuit based on detected harvested power (PHARVEST), each of the first and second parameters (?1,?2) influencing the amount of damping of the mechanical resonator and at least the first parameter (?1) influencing the resonance frequency of the mechanical resonator, wherein the first and second parameters (?1,?2) are varied during the first phase such that the amount of damping remains constant or varies by less than a first significant amount and the resonance frequency reaches a final level.

Abstract: A piezoelectric generator including: a piezoelectric element; a circuit for shorting and placing in open circuit the piezoelectric element; and an inductive converter.