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Pat. 10003253 United States, Int. Cl.22 H02J 1/10, H02M 1/00, H02M 1/42, H02M 5/42, H02M 7/04, H02M 7/08, H02M 7/219, H02M 7/68. Hybrid transformation system based on three-phase PWM rectifier and multi-unit uncontrolled rectifier and control method thereof : Appl. N 15/570378 : Filed 21.07.2015 : Pub. 19.06.2018 : / Guiping Du, Zhifei Liu, Tiansheng Zhu ; Assignee South China University of Technology Scut ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10003253/en?oq=US10003253.html (дата обращения: ДД.ММ.ГГГГ).