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:
May. 01, 2012
Filed:
Jun. 17, 2009
Antonio Coccia, Baden, CH;
Francisco Canales, Baden, CH;
Antonio Coccia, Baden, CH;
Francisco Canales, Baden, CH;
ABB AG, Mannheim, DE;
Abstract
An AC/DC intermediate-circuit converter has a very wide AC input voltage range with a ZVS three-level DC/DC resonant converter with an LLC series-resonant circuit. Two intermediate-circuit capacitors are connected in series between DC intermediate-circuit connections with their common connection point forming a DC intermediate-circuit center connection (). The DC intermediate-circuit connections are connected to the DC connections of a rectifier whose AC input connections have an AC input voltage applied thereto. A range changeover switch is arranged between an AC input connection and the DC intermediate-circuit center connection. The range changeover switch is closed in a lower AC input voltage range, when the ZVS three-level DC/DC resonant converter is operated on the basis of a 'two-level operating mode' modulation strategy, such that the LLC series-resonant circuit has the full DC input voltage present between the DC intermediate-circuit connections applied to it. The range changeover switch is open in a central AC input voltage range when the ZVS three-level DC/DC resonant converter is operated on the basis of the 'two-level operating mode' modulation strategy. The range changeover switch is open in an upper AC input voltage range when the ZVS three-level DC/DC resonant converter is operated on the basis of a “three-level operating mode” modulation strategy, such that the LLC series-resonant circuit has only half the DC input voltage that is present between the DC intermediate-circuit connections applied to it.