Frequency-control-type piezo actuator driving circuit and...

Details Frequency-control-type piezo actuator driving circuit and... Frequency-control-type piezo actuator driving circuit and...

2006-05-18

2008-12-30

Budd, Mark (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S317000, C310S319000

Reexamination Certificate

active

07471029

ABSTRACT:
The present invention relates to a frequency-control-type piezo actuator driving circuit. The frequency-control-type piezo actuator driving circuit includes a piezo actuator that is driven by a constant amplitude of driving voltage pulse; a piezo driver that is connected to the piezo actuator so as to drive the piezo actuator; a frequency controller that is connected to the piezo driver so as to measure currents consumed when the piezo driver drives the piezo actuator, to detect a frequency corresponding to the maximum current among the measured currents, and to generate a frequency control signal corresponding to the detected frequency; and a frequency synthesizer that fixes a frequency of the piezo actuator in accordance with the frequency control signal of the frequency controller and generates the fixed frequency to the piezo driver.

REFERENCES:
patent: 3842340 (1974-10-01), Brandquist
patent: 4445063 (1984-04-01), Smith
patent: 4888565 (1989-12-01), Littleford et al.
patent: 4965532 (1990-10-01), Sakurai
patent: 6545390 (2003-04-01), Hahn et al.
patent: 6577042 (2003-06-01), Lee et al.
patent: 0 764 261 (1997-03-01), None
patent: 01-288378 (1989-11-01), None
patent: 2002-514958 (2002-05-01), None
patent: 2002-165469 (2002-06-01), None
patent: 2003-21779 (2003-01-01), None
Japanese Patent Office, Office Action issued Sep. 30, 2008.

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