Electrical properties of low temperature sintering step-down multilayer piezoelectric transformer

The multilayer structured ceramic transformers were sintered at the low temperature of 940 degrees C and manufactured with the size of 27 x 27 x 2.2mm(3), respectively, using 0.07Pb(Mn1/3Nb2/3)O-3-0.06Pb(Zn1/3Nb2/3)O-3-0.87Pb(Zr0.48Ti0.52)O-3 (A-type) and 0.07Pb(Mn1/3Nb2/3)O-3-0-10Pb(Ni1/3Nb2/3)O-3-0.83Pb(Zr0.48Ti0.52)O-3 (B-type) composition ceramics. And then, their electrical properties were investigated according to the variations of frequency and load resistance. The voltage step-up ratio of the transformers showed the maximum values at the vicinity of 69 kHz. At the load resistance of 100 Omega, A-type and B-type piezoelectric transformers showed the temperature rises of about 21 degrees C at the output power of 15 and 18 W, respectively. At B-type transformer with high effective electromechanical coupling factor (kappa(cff)) and high piezoelectric constant (d(33)), lower temperature increase was relatively appeared.