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:
Jul. 10, 2012
Filed:
May. 15, 2008
Rodney Jones, Stoke On Trent, GB;
Robert Vernon Fulcher, Stoke on Trent, GB;
Henrik Stiesdal, Odense C, DK;
Rodney Jones, Stoke On Trent, GB;
Robert Vernon Fulcher, Stoke on Trent, GB;
Henrik Stiesdal, Odense C, DK;
Converteam Technology Ltd, Warwickshire, GB;
Abstract
A method of controlling a plurality of power convertersandcan be used to interface to a supply network, ac busbar etc. Each power converter includes a network bridgeoperating in accordance with a pulse width modulation (PWM) strategy having the same switching period and which causes at least one unwanted harmonic in the supply network voltage. The method includes the step of providing the switching period of the PWM strategy of each network bridge with a different time offset relative to a time datum such that the at least one unwanted harmonic in the supply network voltage is at least partially cancelled. Two alternative ways of providing the time offset are described.