公开(公告)号：US20200021183A1

公开(公告)日：2020-01-16

申请号：US16456263

申请日：2019-06-28

Applicant: Samsung Electronics Co., Ltd.

Inventor： Shinwook CHOI ,  Jeongil KANG ,  Moonyoung KIM

IPC: H02M1/32 ,  H02M7/21 ,  H02M7/04 ,  H02M1/42 ,  H01R24/60

Abstract: Disclosed is an electronic apparatus including a connector configured to connect the electronic device to an external apparatus; and a power circuit configured to supply power to the connected external apparatus, the power circuit including: a transformer configured to output an output voltage by varying a level of an input voltage; a switching unit comprising a switch configured to perform switching operation for the transformer; a controller configured to control the switching unit to match a level of the output voltage with the external apparatus; and an auxiliary power circuit including an auxiliary winding, and configured to supply power to the controller based on a voltage induced in the auxiliary winding by the output voltage and to decrease the number of turns of the auxiliary winding based on the output voltage having a level greater than or equal to a predetermined value.