Skip to Main Content
The paper presents results of experimental and theoretical studies on small-size piezoelectric generators, in which energy of machine mechanical vibrations is harvested and converted to electric energy. These piezoelectric generators were proposed, as an alternative to a battery-based solution, for powering of sensor nodes in condition monitoring systems of large rotary machines such as turbogenerators in power plants. Initial studies conducted for three bending-beam piezogenerators were focused on maximization of generated electric power by matching load impedance to piezoelectric element output impedance and designing suitable weighting mass for mechanical resonance. As a performance of the piezoelectric element and the weighting mass setup turned out to be unsatisfactory when tested in real conditions on a turbogenerator, synchronized switch harvesting on inductor technique has been recently applied for an enhancement of generated power levels. A test interface circuit is described. The obtained laboratory results confirm possible usefulness of this solution and are a basis for a future work on power-processing blocks operating with piezoelectric generators.
Date of Conference: 25-27 June 2009