In this study, a disk-shaped piezoelectric transformer was fabricated using lead-free -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 and thickness of were measured. For a temperature rise of , the transformer has a maximum output power of . With the matching load, its maximum efficiency is , 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.
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March 2007
Research Article|
March 09 2007
A lead-free piezoelectric transformer in radial vibration modes
Mingsen Guo;
Mingsen Guo
a)
Department of Applied Physics,
The Hong Kong Polytechnic University
, Hunghom, Kowloon, Hong Kong, China; Materials Research Center, The Hong Kong Polytechnic University
, Hunghom, Kowloon, Hong Kong, China; and Department of Physics, Wuhan University
, Wuhan 430072, China
Search for other works by this author on:
D. M. Lin;
D. M. Lin
Department of Applied Physics,
The Hong Kong Polytechnic University
, Hunghom, Kowloon, Hong Kong, China and Materials Research Center, The Hong Kong Polytechnic University
, Hunghom, Kowloon, Hong Kong, China
Search for other works by this author on:
K. H. Lam;
K. H. Lam
Department of Applied Physics,
The Hong Kong Polytechnic University
, Hunghom, Kowloon, Hong Kong, China and Materials Research Center, The Hong Kong Polytechnic University
, Hunghom, Kowloon, Hong Kong, China
Search for other works by this author on:
S. Wang;
S. Wang
Department of Applied Physics,
The Hong Kong Polytechnic University
, Hunghom, Kowloon, Hong Kong, China and Materials Research Center, The Hong Kong Polytechnic University
, Hunghom, Kowloon, Hong Kong, China
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Helen L. W. Chan;
Helen L. W. Chan
Department of Applied Physics,
The Hong Kong Polytechnic University
, Hunghom, Kowloon, Hong Kong, China and Materials Research Center, The Hong Kong Polytechnic University
, Hunghom, Kowloon, Hong Kong, China
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X. Z. Zhao
X. Z. Zhao
Department of Physics,
Wuhan University
, Wuhan 430072, China
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Mingsen Guo
a)
D. M. Lin
K. H. Lam
S. Wang
Helen L. W. Chan
X. Z. Zhao
Department of Applied Physics,
The Hong Kong Polytechnic University
, Hunghom, Kowloon, Hong Kong, China; Materials Research Center, The Hong Kong Polytechnic University
, Hunghom, Kowloon, Hong Kong, China; and Department of Physics, Wuhan University
, Wuhan 430072, Chinaa)
Author to whom correspondence should be addressed; electronic mail: gmsone̱[email protected]
Rev. Sci. Instrum. 78, 035102 (2007)
Article history
Received:
October 11 2006
Accepted:
February 04 2007
Citation
Mingsen Guo, D. M. Lin, K. H. Lam, S. Wang, Helen L. W. Chan, X. Z. Zhao; A lead-free piezoelectric transformer in radial vibration modes. Rev. Sci. Instrum. 1 March 2007; 78 (3): 035102. https://doi.org/10.1063/1.2712795
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