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Pat. 9948199 United States, Int. Cl.22 H02M 5/45, H01F 30/12, H02M 5/44, H02M 5/458, H02M 7/00, H01F 38/00. HVDC converter system with transformer functions or arrangements integrated into a single transformer unit : Appl. N 14/466690 : Filed 22.08.2014 : Pub. 17.04.2018 : / Mats Berglund, Bo Akesson ; Assignee Abb Schweiz Ag ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9948199/en?oq=US9948199.html (дата обращения: ДД.ММ.ГГГГ).