Single crystal piezoelectric transformer using extensional vibra

Details Single crystal piezoelectric transformer using extensional vibra Single crystal piezoelectric transformer using extensional vibra

1997-01-12

1998-06-09

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310358, 310366, H01L 4108

Patent

active

057639833

ABSTRACT:
A piezoelectric transformer (10) consisting of a single-crystal elongated plate (12) with electrodes (20, 26). A pair of driving sections (22) are formed on two opposite end regions of the plate (12). A receiving section (24) is formed on a central region of the plate (12). The plate (12) is operated in an even harmonic vibrational mode with the driving sections (22) operating in a transverse extensional mode and the receiving section (24) operating in a length extensional mode. Driving signals (46, 48) applied to the driving sections (22) are at the resonant frequency of the plate (12). The gain of the transformer (10) is adjustable by shifting the relative phase of the driving signals (46, 48) applied to the respective driving sections (22).

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Piezoelectric Transformers using sinle crystals of Li NbO.sub.3, by K. Nakamura & Y. Adachi, JASA Mar. 28, 1990, pp. 687, 688 (English language translation included).

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