title: High power universal piezoelectric transformer.
abstract: This study describes a multilayer piezoelectric voltage and power transformer that has one direction poling, operates in a wide-frequency range and delivers both step-up and step-down voltages by inverting the electrical connections. In this design, the input and output electrodes are on the same side of the disk and are isolated from each other by a fixed isolation gap. The electrode pattern is a ring/dot structure such that it uses radial mode for both input and output part that are built-in on the same ceramic disk. A prototype transformer was fabricated of size 15 x 2.78 mm2 having mass of 3.8 gm. In the step-down configuration at the constant output power of 6 W, the transformer characteristics across a 100 ohms load were found to be efficiency = 92%, gain = 0.21 input voltage = 110 Vrms, and temperature rise = 20 degrees C from the room temperature. In the step-up configuration at the constant output power of 5 W, the transformer characteristics across a 5 kohms load were found to be efficiency = 97%, gain = 9.5, input voltage = 16 Vrms, and temperature rise = 8 degrees C from the room temperature. A detailed equivalent circuit analysis of the transformer was done, and the results were found to be in excellent agreement with the experimental results.
authors.affiliation: Department of Materials Science and Engineering, University of Texas at Arlington, Arlington, TX 76019, USA. spriya@uta.edu
authors.forename: Shashank
authors.initials: S
authors.lastname: Priya
authors.forename: Hyeoungwoo
authors.initials: H
authors.lastname: Kim
authors.forename: Seyit
authors.initials: S
authors.lastname: Ural
authors.forename: Kenji
authors.initials: K
authors.lastname: Uchino