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Pat. 11515795 United States, Int. Cl.22 H02M 3/335, H02M 1/00, H02M 3/158, H02M 3/24, H02M 7/02, H02J 3/38, H02J 7/00. Power apparatus applied in solid state transformer structure and three-phase power system having the same : Appl. N 16/863318 : Filed 30.04.2020 : Pub. 29.11.2022 : / Sheng-Hua Li, Wen-Lung Huang ; Assignee Delta Electronics Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11515795/en?oq=US11515795.html (дата обращения: ДД.ММ.ГГГГ).