Piezoelectric actuator unit
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United States of America Patent
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Issued Date -
Jul 14, 2005
app pub date -
Jan 10, 2005
filing date -
Jan 14, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A piezoelectric actuator unit 10 for valve switching has a piezoelectric element changing its size on the application of a control voltage for switching the valve. So as to ensure a Totmann (safety) function of the valve and a fast return of the piezoelectric element into its initial position, the piezoelectric actuator unit 10 comprises a discharge circuit with at least one discharge element 21, 31 connected to the piezoelectric element 11. Discharge of the piezoelectric element is effected when the actuator is in its initial, safe position. The discharge circuit has to be switched actively so as to be able to exert a maximum stroke with the piezoelectric actuator.
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