Piezoelectric ceramic transformer

Details Piezoelectric ceramic transformer Piezoelectric ceramic transformer

1994-01-28

1995-08-08

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310320, 310366, H01L 4108

Patent

active

054401950

ABSTRACT:
A piezoelectric ceramic transformer includes a piezoelectric plate, a pair of driving sections, and a power generating section. The piezoelectric plate is made of a piezoelectric ceramic material and has a long plate-like structure. The pair of driving sections are arranged at two end portions of the piezoelectric plate and formed by alternately stacking a plurality of piezoelectric ceramic layers polarized in a direction of thickness of the piezoelectric plate and first internal electrodes, and cause longitudinal vibration by a driving voltage applied to first and second input terminals. The power generating section is arranged at a central portion of the piezoelectric plate in a lengthwise direction thereof and polarized in the lengthwise direction of the piezoelectric plate, and generates an output voltage at a first output terminal by the longitudinal vibration transmitted from the driving sections.

REFERENCES:
patent: 2953755 (1960-09-01), Mattiat
patent: 3271622 (1966-09-01), Malagodi et al.
patent: 3707636 (1972-12-01), Inoue
patent: 4431935 (1984-02-01), Rider
patent: 4459505 (1984-07-01), Lim
patent: 4564782 (1986-01-01), Ogawa
patent: 5118982 (1992-06-01), Inoue et al.
patent: 5278471 (1994-01-01), Uehara et al.
"Piezoelectric Transformers Using Single Crystals of LiNbO.sub.3 " by Nakamura and Adachi, Oct. 18, 1990, pp. 15-19 w/English abstract.
"Ceramic Transformers and Filters" May 1956, pp. 205-211.
"Piezoelectric Transformer Using Energy Trapping of Width-Shear Vibration in LiNbO.sub.3 Plate" by M. Ueda et al., 1992 Ultrasonics Symposium, pp. 977-980.

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