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Pat. 11437927 United States, Int. Cl.22 H02M 7/483, H02M 1/42, H02M 1/14. Voltage source converter generating a pulse train using two voltage levels : Appl. N 17/272076 : Filed 13.09.2018 : Pub. 06.09.2022 : / Nan Chen, Federico Bertoldi, Kalle Ilves, Cicero Da Silveira Postiglione ; Assignee Hitachi Energy Switzerland Ag ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11437927/en?oq=US11437927.html (дата обращения: ДД.ММ.ГГГГ).