公开(公告)号：US10020687B2

公开(公告)日：2018-07-10

申请号：US15113591

申请日：2015-01-22

Applicant: Apple Inc.

Inventor： Eugenio Jr. Sia Lecias ,  Junbo Zeng ,  Saining Ren ,  Daniel James Robertson ,  Michael Nasa ,  Ron Rafer Floresca ,  Arunim Kumar ,  Ali Abdolkhani

IPC: H02J50/12 ,  H02J50/40 ,  H01F38/14 ,  H02J7/02 ,  H02J5/00 ,  H02J50/80 ,  H02M7/06 ,  H02J50/70

CPC classification number: H02J50/12 ,  H01F38/14 ,  H02J5/005 ,  H02J7/025 ,  H02J50/40 ,  H02J50/70 ,  H02J50/80 ,  H02M7/06

Abstract: An inductive power transfer device including: a resonant circuit, having a power transfer coil and a power transfer capacitor; a coupling coil, magnetically-coupled to the power transfer coil; a variable impedance; and a controller configured to determine the impedance value of the variable impedance based on predetermined criteria including: substantially regulating power provided to a load; tuning the resonant circuit resonant frequency substantially to a predetermined frequency; adjusting a frequency of a magnetic field associated with the power transfer coil; and/or adjusting an impedance reflected by the power transfer coil to a corresponding coupled power transfer coil.