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:
Mar. 19, 2013
Filed:
Dec. 23, 2008
Lars Döfnäs, Ludvika, SE;
Lennart Harnefors, Eskilstuna, SE;
Anders J. Pettersson, Ludvika, SE;
Gunnar Asplund, Solna, SE;
Erika Siljestrom, Grängesberg, SE;
Lars Döfnäs, Ludvika, SE;
Lennart Harnefors, Eskilstuna, SE;
Anders J. Pettersson, Ludvika, SE;
Roland Siljeström, Grängesberg, SE;
Gunnar Asplund, Solna, SE;
ABB Technology AG, Zurich, CH;
Abstract
A device for converting a DC voltage into an AC voltage and vice versa comprises a control system to control the voltage conversion and at least one phase leg () with a first (Uvp) voltage source connected in series between a first DC terminal () and a first AC terminal () and with a second (Uvn) voltage source connected in series between the first AC terminal () and a second DC terminal (). Each of the voltage sources comprises at least a first and a second submodule () in series-connection, where each submodule () comprises at least two power electronic switches () connected in parallel with at least one capacitor (). The control system comprises a central control unit () and at least two subunits (), where the central control unit () transmits to each subunit () a reference AC voltage (ua_ref) and a switching carrier signal (s_sw) and where each subunit () controls the switching of the power electronic switches () of one of the submodules () according to a PWM pattern so that each time the switching carrier signal (s_sw) crosses the reference AC voltage (ua_ref) either the voltage across the capacitor () or a zero voltage are applied to output terminals () of the corresponding submodule ().