Characteristics of piezoelectric transformer for power supply

This paper present a new structure for piezoelectric transformer, operating in thickness extensional vibration mode. Modified PbTiO₃ family ceramics were used for the piezoelectric transformer, because it is a material with large anisotropy between electromechanical coupling factors k_t and k_p. Piezoelectric transformer was fabricated that is 20 mm long, 20 mm wide and 3.1 mm thick. Resonant frequencies of second thickness extensional vibration mode is 1.56 and 1.58 MHz at loading resistance 100 and 200 [Ω], respectively. And maximum voltage gain of piezoelectric ceramics is showed 0.72 and 0.86 at resonant frequency of second thickness extensional vibration mode at loading resistance 100 and 200 [Ω], respectively