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Pat. 9941689 United States, Int. Cl.22 H02H 3/22, H02H 7/12, H02M 1/32, H02M 3/335. Switching mode power supply including surge protection circuit and image forming apparatus including the same : Appl. N 13/645833 : Filed 05.10.2012 : Pub. 10.04.2018 : / Young-Jun Song ; Assignee S Printing Solution Co Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9941689/en?oq=US9941689.html (дата обращения: ДД.ММ.ГГГГ).