公开(公告)号：US20190036447A1

公开(公告)日：2019-01-31

申请号：US15718936

申请日：2017-09-28

Applicant: Apple Inc.

Inventor： InHwan Oh ,  Abby Cherian ,  Bharat Patel

IPC: H02M1/42 ,  H02M3/335 ,  H02M1/08

Abstract: A primary resonant flyback converter may include a primary winding, a resonant capacitor in series with the primary winding, a secondary winding magnetically coupled to the primary winding, and an output electrically coupled to the secondary winding. A main switch may be operated to energize the primary winding when closed and transfer energy stored in the primary winding to the secondary winding when open. An auxiliary switch may be configured to switch complimentarily to the main switch, thereby allowing a resonant current to circulate through the primary winding and capacitor. Switch timing may be controlled to produce a desired output voltage. The converter may also include an input inductor that receives an input voltage, presenting an improved power factor to an AC input power source and in conjunction with the switching devices boosts a rectified AC input voltage to a DC voltage bus of the converter.

公开(公告)号：US09825481B2

公开(公告)日：2017-11-21

申请号：US13648131

申请日：2012-10-09

Applicant: Apple Inc.

Inventor： Kisun Lee ,  Bharat K. Patel ,  Abby Cherian

IPC: H01H47/00 ,  H01H83/00 ,  H02J7/00 ,  H02J7/02 ,  H02M3/335 ,  H02J9/00 ,  H02M3/337 ,  H02M1/00

CPC classification number: H02J7/022 ,  H02J9/005 ,  H02M3/335 ,  H02M3/337 ,  H02M2001/0032 ,  Y02B70/16 ,  Y10T307/858

Abstract: The disclosed embodiments provide a system that facilitates operation of a power adapter in hiccup mode. The system includes a bleeding mechanism that reduces a hiccup time of the hiccup mode by increasing a leakage current of the power adapter. The system also includes an activation mechanism that activates the bleeding mechanism upon detecting a voltage drop associated with the hiccup mode.