Four-terminal piezoelectric ceramic transformer

Details Four-terminal piezoelectric ceramic transformer Four-terminal piezoelectric ceramic transformer

1996-12-19

1998-10-06

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310366, H01L 4108

Patent

active

058181504

ABSTRACT:
A generator section and a pair of drive sections are disposed along the lengthwise of a piezoelectric ceramic plate. The one pair of drive sections are disposed at both ends or at one end of the plate and have a pair of electrodes for each. The piezoelectric ceramic plate in the drive sections are polarized oppositely in direction and connected to a pair of external terminals. The generator section has two pairs of opposed electrodes which are polarized oppositely from the center along the lengthwise of the plate. The two pairs of opposed electrodes are respectively short-circuited and connected to external terminals. A voltage can be taken out from between the external terminals of the generator section at the vibration nodes when the piezoelectric ceramic plate in the drive section is vibrated by applying an AC voltage to between the input terminals on the drive section side at the resonance frequency of the fourth-order mode longitudinal vibration in lengthwise. This 4-terminal piezoelectric ceramic transformer has a high-voltage/high-reliability and is easy to handle in the design of a peripheral circuit.

REFERENCES:
patent: 5365141 (1994-11-01), Kawai et al.
patent: 5440195 (1995-08-01), Ohnishi et al.
patent: 5463266 (1995-10-01), Fukuoka et al.
patent: 5504384 (1996-04-01), Lee et al.
patent: 5576590 (1996-11-01), Ohnishi et al.

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