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:
Nov. 06, 2012
Filed:
Dec. 02, 2009
Mark J. Murphy, Kilmore, IE;
Alan Gillespie, East Lothian, GB;
Eoin Edward English, Pallasgreen, IE;
Donal Geraghty, Limerick, IE;
Dennis A. Dempsey, Newport, IE;
Mark J. Murphy, Kilmore, IE;
Alan Gillespie, East Lothian, GB;
Eoin Edward English, Pallasgreen, IE;
Donal Geraghty, Limerick, IE;
Dennis A. Dempsey, Newport, IE;
Analog Devices, Inc., Norwood, MA (US);
Abstract
A device and method are provided to drive piezoelectric elements in haptic applications. In one embodiment, a pattern generator provides user programmable PWM waveforms to a driver. The load of the driver is an inductor in series with the piezoelectric element. The filtration of the inductor in series with the capacitance of the piezoelectric element suppresses the high-frequency components of the PWM pulse train, and recovers a value commensurate with the duty cycle of the PWM pulse train. The resulting waveform across the piezoelectric element is converted to physical motion, thereby creating a haptic effect on a user interface. Advantageously, there is reduced power loss, reduced switching induced noise, and a more haptic rich environment.