The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 25, 2007
Filed:
Apr. 02, 2004
James Vogeley, Yorktown, VA (US);
James Vogeley, Yorktown, VA (US);
Adaptivenergy, LLC, Hampton, VA (US);
Abstract
A drive circuit () senses a parameter of a piezoelectric actuator () operating in a device () and adjusts a drive signal of the piezoelectric actuator in accordance with the parameter. The drive circuit comprises a controller () which controls a drive signal applied to the piezoelectric actuator (); a feedback monitor () which obtains a feedback signal from the piezoelectric actuator while the piezoelectric actuator works; and, a processor () which uses the feedback signal to determine the parameter of the piezoelectric actuator. In one example mode, the parameter of the piezoelectric actuator which is determined by the piezoelectric actuator drive circuit is the capacitance or dielectric constant of the piezoelectric actuator. In other example modes, the parameter of the piezoelectric actuator which is determined by the piezoelectric actuator drive circuit is impedance or resonant frequency of the piezoelectric actuator.