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Pat. 11411511 United States, Int. Cl.22 H02M 7/483, H02J 3/36, H02M 3/155. Switchable longitudinal voltage source, direct current transmission system with longitudinal voltage source and method for operating a longitudinal voltage source : Appl. N 17/279724 : Filed 25.09.2018 : Pub. 09.08.2022 : / Mark-Matthias Bakran, Viktor Hofmann, Andre Schoen ; Assignee Siemens Energy Global Gmbh and Co Kg ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11411511/en?oq=US11411511.html (дата обращения: ДД.ММ.ГГГГ).