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. 08, 2002
Filed:
Sep. 27, 2001
Applicant:
Inventor:
Ivan Jadrić, York, PA (US);
Assignee:
York International Corporation, York, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M 7/217 ; H02M 7/5387 ;
U.S. Cl.
CPC ...
H02M 7/217 ; H02M 7/5387 ;
Abstract
A system and method are provided for controlling a three-phase pulse-width-modulated alternating-current voltage regulator, in order to reduce inrush current when starting, for example, a large three-phase induction motor. The system and method include a set of four-quadrant switches connected in a converter circuit between the input voltage and the output load. By applying certain switching states in a determined sequence based on sensed values of the input voltage at the three lines, the system and method synthesize a three-phase variable magnitude output voltage from the three-phase input voltage of fixed magnitude.