Title: Drive control device for a piezoelectric actuator, electronic device, and drive control method for a piezoelectric actuator
Application Number: 200610115974 Application Date: 2006.08.22
Publication Number: 1921282 Publication Date: 2007.02.28
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H02N2/00;H01L41/00;G04C3/12
Applicant(s) Name: Seiko Epson Corp. Address:
Inventor(s) Name: Urano Osamu
Attorney & Agent: huang lunwei
Abstract:
    A piezoelectric actuator drive control device, electronic device, and piezoelectric actuator drive control method simplify the arrangement of the control circuitry, and enable easily controlling driving a driven body and piezoelectric actuator current. A PWM signal source outputs a variable pulse width control pulse signal B to change the ratio between the periods t-n and t-w when pulse width Nr and pulse width Wd are selected as the pulse width of the drive pulse signal I. This enables the drive control device to freely control the rotor speed and to freely control current flow to the piezoelectric actuator. This arrangement simplifies drive control and eliminates the difficulty of limiting the pulse width and frequency that occurs when directly controlling the drive signal pulse width and frequency.
Time: 9
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