Design of a Circular Piezoelectric Transformer with Crescent-Shaped Input Electrodes

概要

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In this study, a new disk-type piezoelectric transformer design is proposed. The input side of the transformer has a crescent-shaped electrode and the output side has a focused poling direction. The electrodes and poling directions on commercially available piezoelectric ceramic disks were designed so that the planar or shear mode coupling factor ($k_{\text{p}}$ or $k_{15}$) becomes effective rather than the transverse mode coupling factor ($k_{31}$). ATILA finite element code was used to analyze transformer behavior and to optimize electrode and poling configurations. The voltage step-up ratio of the proposed transformer has been markedly improved in comparison with that of the equivalent rectangular type. A single layer prototype transformer, 25.4 mm in diameter and 1.0 mm thick, operated at 92.8 kHz, was fabricated and its characteristics, such as step-up ratio and power transformation efficiency were measured. While the transformer was driving a cold cathode fluorescent lamp (CCFL), the temperature field of the transformer was also observed.
Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
2003-02-15