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. 10, 2000
Filed:
Nov. 08, 1999
Alexander L Julian, Vernon, CT (US);
Otis Elevator Company, Farmington, CT (US);
Abstract
An active inductor for controlling transistor bridge switching carrier frequency current components in the power mains connected to a three-phase AC/DC switched bridge converter includes a transformer for each phase, each having a secondary between the AC main and the switched bridge, the primary of which is driven by a bridge switched at much higher frequency in response to a synthesized waveform which ideally will completely cancel the main power bridge switching current components. Reduction of the current carrying requirement of the active inductor is achieved by providing negative feedback of the fundamental power frequency from the primary of each transformer; deviations in the synthesized waveform from the ideal waveform, due to delays and distortions in real circuits and/or processing, are reduced by providing negative feedback from the resultant current (the secondary of the active filter transformer).
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile