Driving apparatus for piezo-actuator having abnormality detecting function
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United States of America Patent
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May 7, 2002
Grant Date -
N/A
app pub date -
Nov 7, 2001
filing date -
Dec 22, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a driving apparatus for piezo-stacks, a controller repeats switching operation for turning switching elements on/off to thereby attain a determined piezo-actuator voltage. An abnormality detecting circuit determines abnormality of the piezo-stacks by comparing the number of times of charging and the number of times of discharging, or charging/discharging time periods at this occasion with those at normal time.
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