Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/636
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Title: A lead-free piezoelectric transformer in radial vibration modes
Authors: Guo, M
Lin, D
Lam, KH
Wang, S
Chan, HLW 
Zhao, X
Issue Date: 9-Mar-2007
Source: Review of scientific instruments, 9 Mar. 2007, v. 78, 035102, p. 1-5
Abstract: In this study, a disk-shaped piezoelectric transformer was fabricated using lead-free (K,Na)NbO₃-based ceramics with high mechanical quality factor. The transformer can operate in the fundamental or the third radial vibration mode. The transformer is poled along the thickness direction. The top surface is covered by ring/dot silver electrodes separated by an annular gap which serve as the input and output parts of the transformer, respectively. The bottom surface, fully covered with a silver electrode, is grounded as a common electrode. The dimensions of the top ring/dot electrodes are designed such that the third radial vibration mode can be strongly excited. The electrical properties of the transformer with diameter of 34.2 mm and thickness of 1.9 mm were measured. For a temperature rise of 35°C, the transformer has a maximum output power of 12 W. With the matching load, its maximum efficiency is >95%, and maximum voltage gains are 6.5 and 3.9 for the fundamental and the third radial vibration modes, respectively. It has potential to be used in power supply units and other electronic circuits.
Keywords: Piezoelectric devices
Transformers
Potassium compounds
Sodium compounds
Vibrations
Ceramics
Publisher: American Institute of Physics
Journal: Review of scientific instruments 
ISSN: 0034-6748
EISSN: 1089-7623
Rights: © 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in M. Guo et al., Rev. Sci. Instrum. 78, 035102 (2007) and may be found at http://link.aip.org/link/?rsi/78/035102.
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