Drive apparatus for piezoelectric actuator, drive method for...

Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C310S316020, C310S323020

Reexamination Certificate

active

11269682

ABSTRACT:
A drive apparatus for a piezoelectric actuator prevents locking drive frequency in a state of resonance due to harmonics. There is no need to provide external components to filter, and circuitry can easily be reduced in size. The drive apparatus has a phase difference-DC conversion circuit to detect vibrating state of the vibrating body, a comparison circuit, a harmonics detection circuit to detect that the vibrating body is resonating due to harmonics and outputting a harmonics detection signal, an integration circuit to control the frequency of the drive signal supplied to the piezoelectric element of the vibrating body, a variable frequency oscillation circuit, and a drive circuit. The integration circuit, the variable frequency oscillation circuit, and the drive circuit control the frequency of the drive signal on the basis of the output of the comparison circuit when a harmonics detection signal is not outputted and continue to vary the frequency of the drive signal without controlling the frequency of the drive signal on the basis of the output of the comparison circuit when a harmonics detection signal is being outputted.

REFERENCES:
patent: 4025875 (1977-05-01), Fletcher et al.
patent: 6376965 (2002-04-01), Kataoka et al.
patent: 6429571 (2002-08-01), Raffalt et al.
patent: 7116033 (2006-10-01), Seki et al.
patent: 2002-291264 (2002-10-01), None

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Drive apparatus for piezoelectric actuator, drive method for... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Drive apparatus for piezoelectric actuator, drive method for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drive apparatus for piezoelectric actuator, drive method for... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3811382

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.