公开(公告)号：US09768703B2

公开(公告)日：2017-09-19

申请号：US14985040

申请日：2015-12-30

Applicant: Apple Inc.

Inventor： Zaohong Yang ,  Bharatkumar K. Patel ,  Bogdan T. Bucheru ,  Juan Carlos Pastrana

IPC: H02M3/315 ,  H02M3/335 ,  H02M1/32 ,  H02M1/00

CPC classification number: H02M3/33592 ,  H02M1/32 ,  H02M2001/0032 ,  H02M2001/0038 ,  H02M2001/0054 ,  Y02B70/1475 ,  Y02B70/1491 ,  Y02B70/16

Abstract: The disclosed embodiments provide a system that operates a flyback converter. During activation of a synchronous rectifier (SR) controller on a secondary side of the power converter, the system temporarily disables driving of a gate of a metal-oxide-semiconductor field-effect transistor (MOSFET) by the SR controller to enable synchronization of the SR controller to a switching frequency on a primary side of the power converter. After driving of the gate of the MOSFET by the SR controller has been disabled for a pre-specified period, the system enables driving of the gate of the MOSFET by the SR controller.