Abstract
This paper reports the study and the modelling of a new topology of traveling wave piezoelectric transformer (TWPT). Unlike conventional piezoelectric transformers, the proposed transformer uses progressive waves to carry out the electromechanical conversion. Moreover, associated with an appropriate converter, it enables any kind of AC-DC or AC-AC power conversion. An analytical modelling of the system is carried allowing defining numerically the voltages, currents, displacements and stresses in the piezoelectric transformer over time as a function of the geometrical and physical parameters of the materials.
Highlights
In conventional piezoelectric transformers (PT), the coupling between primary and secondary sides is realized by mechanical coupling through a standing wave
For a flexural wave; the traveling wave piezoelectric transformer (TWPT) must consist in two piezoelectric ceramics polarized in opposite directions and gathered together
From the Euler Bernoulli beam theory and piezoelectric equations, we find that the propagation of a flexural wave in the direction 3 alongside direction 1 is governed by equation (1)
Summary
In conventional piezoelectric transformers (PT), the coupling between primary and secondary sides is realized by mechanical coupling through a standing wave. These transformers will only provide one or two output voltages with fixed phase shift compared to the input limiting their use to simple power converter topology. The generation of a traveling wave inside the PT instead of a stationary wave allows obtaining at the secondary side numerous output voltages with the same amplitude and different phase-shifts between them. To the author’s knowledge, only one paper [1] proposes the use of a traveling wave for electric to electric conversion but for a bulk wave and without considering the generation of a multiphase system at the output. We will present a piezoelectric transformer converting energy by generating a flexural traveling wave leading to an octophase system at the outputs
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