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Pat. 9866027 United States, Int. Cl.22 H03M 13/00, H02J 3/36, H02M 5/40, H04L 1/20. Device and method for controlling high voltage direct current transmission system : Appl. N 14/597057 : Filed 14.01.2015 : Pub. 09.01.2018 : / Seung Hun Lee, Eung Soo Kim, Jong Bae Kim ; Assignee Lsis Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9866027/en?oq=US9866027.html (дата обращения: ДД.ММ.ГГГГ).