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Pat. 10312017 United States, Int. Cl.22 H01F 27/29, H01F 30/02, H01F 30/12, H02M 7/04, H02M 7/08, H05K 7/20. Symmetrical step-up and step-down autotransformer delta topology : Appl. N 15/423434 : Filed 02.02.2017 : Pub. 04.06.2019 : / Jian Huang, Eugene V. Solodovnik, Kamiar J. Karimi ; Assignee Boeing Co ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10312017/en?oq=US10312017.html (дата обращения: ДД.ММ.ГГГГ).