A study on the electric characteristics of piezoelectric transformer using PZT

Rectangular type piezoelectric ceramic transformer was made from Pb(Zrsub(0.54)Tisub(0.46))O3 added with 1.2 Wt% La2O3. The frequency characteristics of output voltage, linearity of input and output voltage by the supporting point, and the temperature characteristic of resonant frequency were measured. At the lambda/2 and lambda resonance, the high voltage step-up ratio was shown. And at the lambda/2 resonant frequency 34.37 KHz of 4.14 x 1.35 x 0.2 (cm) element, the voltage stepped up 11 times. And it was found that the increase of voltage step-up ratio depends on the decrease of element thickness. Output voltage and resonant frequency were changed sensitively with the supporting point, and the output voltage was saturated by increasing of input voltage, and the resonant frequency decreased as the temperature rised. (author)