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:
Feb. 23, 2010
Filed:
Sep. 17, 2007
Daniel J. Sadler, Gilbert, AZ (US);
David B. Cranfill, Antioch, IL (US);
Michael F. Olley, Lake Zurich, IL (US);
Eric V. Tashakkor, Waukegan, IL (US);
Daniel H. Wagner, Grayslake, IL (US);
Daniel J. Sadler, Gilbert, AZ (US);
David B. Cranfill, Antioch, IL (US);
Michael F. Olley, Lake Zurich, IL (US);
Eric V. Tashakkor, Waukegan, IL (US);
Daniel H. Wagner, Grayslake, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A circuit () for controlling at least one piezoelectric actuator () includes a piezoelectric drive circuit () that generates unidirectional voltage drive signal, also referred to as V, at node (). The piezoelectric actuator drive circuit () includes a boost switcher circuit or charging circuit (), a buck switcher circuit or pulsed current sink discharge circuit () and a control signal generating circuit () that receives an input control signal () from, for example, a keyboard processor or other suitable processor () indicating that the device has requested generation of haptic feedback utilizing the piezoelectric actuator (). The control signal generating circuit () provides at least two pulse-with-modulated control signals, one to control the charging circuit and one to control the discharging circuit to produce the unidirectional voltage drive signal, that in one example is a raised cosine drive signal ().