Piezoelectric ceramic transformer

Abstract

Abstract This paper presents a piezoelectric ceramic transformer which has a no-load alternating current voltage step-up ratio of about 150–200. The composition of the material is: ternary piezoelectric ceramics. The experimental results made on the material properties and the characteristics of transformer elements are presented. Based on the analysis of scanning electronic microscope and X-ray diffraction, the relations between physical properties and microstructure of piezoelectric ceramics were studied. With laser holography, under high voltage, the vibration modes of the transformer elements were measured. Amplitude distributions of vibration modes were quantitatively computed. The results were related with the voltage step up ratio. Analysis and comparison were made between vibration modes. The bar samples were used as transverse-type piezoelectric transformer elements. The specimens were made in disks of 8 × 0.8 mm and bars of 120 × 26 × 3 mm.