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Pat. 11303202 United States, Int. Cl.22 H02M 1/42, H02M 1/32, H02M 3/156, H02M 1/00. Power factor improvement circuit and switching power supply device using same : Appl. N 17/124764 : Filed 17.12.2020 : Pub. 12.04.2022 : / Nobuyuki Hiasa ; Assignee Fuji Electric Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11303202/en?oq=US11303202.html (дата обращения: ДД.ММ.ГГГГ).