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:
Nov. 04, 2003
Filed:
Jul. 24, 2002
Ingvar Hagman, Ludvika, SE;
ABB Group Services Center AB, Vasteras, SE;
Abstract
A method for control of an extinction angle of a line-commutated converter in dependence on a minimum reference value for the extinction angle. The converter has a plurality of valves, each one of the plurality of valves having at least one semiconductor element capable of being fired, and the device has a unit for generating firing control pulses for a commutating valve in dependence on the minimum reference value of the extinction angle according to a given criterion for commutation of a direct current through the converter. The device has a unit for continuously forming an operating value of recovery time for the semiconductor element of a decommutating valve, and a unit for forming the minimum reference value of the extinction angle in dependence of the operating value.