The fabrication and testing of a piezoelectric transformer

A piezoelectric ceramic,based on PbZr0,52Ti0,~~d0o1ped with Li, Nb and Mn, has been fab- ricated and tested. Good electromechanical properties were observed for the ceramic, in par- ticular, Q, and k,, were 1435 and 0.673, respectively; the addition of manganese increased the Q, remarkably. An open circuit gain of 1100 was determined for a transformer 2.4 mm thick and with a driver length of 12.6mrn. Using the second harmonic resonance to test the transformer, a voltage gain of453 was observed with a load resistance of 100MR