Piezoelectric actuator drive device

Details Piezoelectric actuator drive device Piezoelectric actuator drive device

2009-07-02

2010-06-08

Dougherty, Thomas M (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S317000

Reexamination Certificate

active

07732976

ABSTRACT:
In a piezoelectric actuator control device for controlling operation of one or more piezoelectric actuators, when receiving a drive signal of a low level, a discharging switch is repeatedly turned on and off in order to discharge electric charge accumulated in the piezoelectric actuator. That is, the discharging switch is kept ON until a discharging current from a piezoelectric actuator reaches a peak threshold value Ip. When the discharging current reaches the peak threshold value Ip, the discharging switch is turned OFF and kept OFF until a discharging current from a piezoelectric actuator reaches a peak threshold value Ip. The device has a threshold value setting circuit for increasing the peak threshold value according to a discharging period of time.

REFERENCES:
patent: 2007/0296307 (2007-12-01), Fukagawa et al.
patent: 2009/0051247 (2009-02-01), Kakehi et al.

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