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Pat. 10998858 United States, Int. Cl.22 H03F 3/04, H03F 1/02, H03F 3/20, H04R 3/00, G05F 1/46, H02M 3/07. Power supply circuit and audio play device : Appl. N 16/462698 : Filed 09.03.2017 : Pub. 04.05.2021 : / Xun Zhang ; Assignee Huawei Technologies Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10998858/en?oq=US10998858.html (дата обращения: ДД.ММ.ГГГГ).