Rosen-type $Pb(Mg1∕3Nb2∕3)O3–PbTiO3$ single crystal piezoelectric transformer

In this study, a Rosen-type $Pb(Mg1∕3Nb2∕3)O3–PbTiO3$ single crystal piezoelectric transformer is presented. First, we simulate the operation of this transformer using the finite element method and ANSYS. By adjusting the dimensions of the piezoelectric transformer, a maximum voltage step-up ratio of 138 can be obtained at a frequency of $33.8kHz$ when the output part is open. Second, we fabricate a transformer with the size of $20mm$ length, $4mm$ width, and $1mm$ thickness to examine the simulation results. It is found that this transformer exhibits a maximum voltage step-up ratio of 134 at $37kHz$⁠, with the efficiency over 95% when driving a liquid crystal display backlight, which shows good consistency with the numerical simulation results. Besides, we investigate the electrical properties under different frequencies and load resistances. When the input voltage increases, a maximum output power of $1W$ is obtained with the temperature rise less than $10°C$⁠.