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:
Aug. 17, 2004
Filed:
Apr. 17, 2003
Eugene Francis Plutowski, Rochester, MN (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A method and circuit ( ) are presented for reducing a current spike ( ) created after a commutation of a driving current of a polyphase motor ( ). The motor ( ) has a plurality of coils ( ) that are driven by a commutated dc voltage from a power supply. The circuit ( ) includes a circuit that produces a signal (DrvENOccurred) for indicating a commutation of the dc voltage and a circuit for PWM modulating the dc voltage (CLK, ) during at least a portion of a time before a current induced in one of the coils ( ) reaches a peak value. A counter ( ) determines at least a portion of a time that begins a delayed time after the commutation, and ends when the current reaches the peak value.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile