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Pat. 11121626 United States, Int. Cl.22 H02M 3/158, H02M 1/08, H02M 3/156, H02M 3/157. Switching frequency control apparatus and control method thereof : Appl. N 16/578758 : Filed 23.09.2019 : Pub. 14.09.2021 : / Xiaoyu Xi, Bo Yang, Lou Nuo ; Assignee M3 Technology Inc Taiwan ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11121626/en?oq=US11121626.html (дата обращения: ДД.ММ.ГГГГ).