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:
Oct. 02, 1990
Filed:
Dec. 11, 1989
Maurice A Kirchberg, Jr, Dubuque, IA (US);
Sundstrand Corporation, Rockford, IL (US);
Abstract
A PWM inverter takes into account the harmonic distortion produced by a d.c. link which is not constant. The controller determines switching angles in real time eliminating the need for storing PWM patterns in ROM. This is made possible by a 'quick' Fourier transform which allows the determination of switching events in a PWM inverter in real time. The inverter controller develops pattern sets for rejecting selected harmonics and accounts for known fixed harmonic distortion on the d.c. link by determining the set of switching angles for each controlled selected harmonic.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile