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:
Jan. 03, 2006
Filed:
Aug. 23, 2004
Derek Albert Paice, Palm Harbor, FL (US);
Derek Albert Paice, Palm Harbor, FL (US);
Other;
Abstract
An 18-pulse converter is constructed using two, high zero-sequence impedance, phase-shifting autotransformers to parallel two 3-phase bridge converters. A third 3-phase bridge converter is directly connected to the power source. Depending on the DC filtering technique, the kVA rating of each autotransformer is 15 to 22% that of the DC load kW. The method facilitates paralleling of 3-phase bridge converters to reduce system AC line current harmonics, and is suitable for 18, 24, 36, and higher pulse numbers. The minimum number of individual autotransformers required is (n−1), where n is the number of 3-phase bridge converters. Due to the high zero-sequence impedance of the autotransformers, only a small DC load is needed to limit the DC output voltage. AC line reactance may be included in series with each converter, or in the 3-phase AC power source, to further reduce AC line current harmonics.