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. 23, 2001
Filed:
Dec. 20, 1999
Miguel E. Chavez, Raleigh, NC (US);
Fred Tassitino, Wake Forest, NC (US);
John G. Tracy, Raleigh, NC (US);
Powerware Corporation, Raleigh, NC (US);
Abstract
Twelve-pulse rectifiers include a first controller that controls a first six-pulse rectifier, a second controller that controls a second six-pulse rectifier and a data network that couples the first controller and the second controller to exchange data therebetween. The first and second controllers preferably have a common architecture and preferably operate independently. Each controller preferably controls its associated six-pulse rectifier as a function of the current and/or voltage output of the associated six-pulse rectifier, preferably using conventional feedback control techniques. Moreover, the first controller also preferably controls the first six-pulse rectifier as a function of a second current at the second six-pulse rectifier output, and the second controller preferably controls the second six-pulse rectifier as a function of a first current at the first six-pulse rectifier output. Thus, each six-pulse rectifier may be controlled as a function of the current at the other six-pulse rectifier output. The first controller preferably receives second data representing the second current at the second six-pulse rectifier output via the data network, and the second controller preferably receives first data representing a first current at the first six-pulse rectifier output via the data network. The first controller preferably continues to control the first six-pulse rectifier upon failure of the second controller to thereby provide a first output current from the first six-pulse rectifier at the twelve-pulse rectifier output. Similarly, the second controller preferably continues to control the second six-pulse rectifier upon failure of the first controller to thereby provide a second output current from the second six-pulse rectifier at the twelve-pulse rectifier output. When the first and second controllers are operational, the first and second six-pulse rectifiers may be controlled by their respective first and second controllers.