LINEAR DRIVE METHOD FOR PIEZOELECTRIC CERAMIC ACTUATOR AND LINEAR DRIVE CIRCUIT APPLYING IT

Japanese Patent JP3807780

B2

PROBLEM TO BE SOLVED: To provide a linear drive circuit applying a linear drive method for piezoelectric ceramic actuator capable of performing a DC linear drive without requiring expensive means and of reducing the hysteresis of displacement-voltage characteristics.
SOLUTION: In this linear drive circuit, a detection signal of a nonlinear generated voltage detected and measured separately and independently from a DC input voltage by a bridge circuit including a piezoelectric element capacitor CP roughly sketched is input with a subtractor 5, this detected signal is properly amplified proportionally as gain H by a proportional gain circuit 1, is turned into an addition signal by adding to a DC input voltage VIN with an adder 2, then applied to the piezoelectric element capacitor CP as a gain G1 by a voltage applying circuit 3, and the displacement of the piezoelectric ceramic actuator can be made linear relative to the DC input voltage VIN because the substructure 5 has a loop configuration containing an adjusting gain 1/G1 for adjusting the gain adjust circuit 4 to take a balance for the bridge circuit.

JPH03135379	DRIVE FOR PIEZOELECTRIC ACTUATOR
JP2903085	PIEZOELECTRIC DRIVE TYPE CARRYING DEVICE
JPH0710186	[Title of Invention] Ultrasonic Motor

Seiji Chonan
Jiang Wei
Yoshiaki Fuda

JP14541196A

August 09, 2006

June 07, 1996

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NEC TOKIN CORPORATION

H01L41/09; H02N2/00; (IPC1-7): H02N2/00; H01L41/09

JP1096972A
JP5212354A
JP8075689A
JP63204672A

Kenho Ikeda
Keisuke Yamamoto
Kiyoshi Kurihara

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