Piezoelectric actuator drive apparatus, electronic device,...

Details Piezoelectric actuator drive apparatus, electronic device,... Piezoelectric actuator drive apparatus, electronic device,...

2008-03-04

2008-03-04

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

07339305

ABSTRACT:
The control circuit (131) causes drive frequency modification to be re-executed after returning the drive frequency to the prescribed drive frequency when the reduction rate of the power source voltage is higher than the standard reduction rate; specifically, when driving is being performed at a drive frequency whereby drive efficiency is poor and power consumption is high, or when the piezoelectric actuator A cannot start up for whatever reason. Therefore, since a startup failure or the like can be immediately determined based on the reduction rate of the power source voltage without a long time elapsing before the startup failure is detected, the time required for this determination can be shortened, the processing that is performed from the detection of an abnormality until optimization of the drive signal can be quickly executed, electrical power consumption can be reduced, and low-power operation can be ensured.

REFERENCES:
patent: 5001442 (1991-03-01), Hanaie et al.
patent: 5436521 (1995-07-01), Kataoka
patent: 5495152 (1996-02-01), Fukui
patent: 6100622 (2000-08-01), Yamamoto et al.
patent: H05-184171 (1993-07-01), None

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