公开(公告)号：US09923383B2

公开(公告)日：2018-03-20

申请号：US14627957

申请日：2015-02-20

Applicant: Apple Inc.

Inventor： David W. Ritter ,  Jeffrey M Alves ,  Todd K. Moyer ,  Steven G. Herbst

IPC: H01F27/42 ,  H02J5/00 ,  H02J7/02 ,  H02J17/00 ,  H03H7/40

CPC classification number: H02J5/005 ,  H02J7/025 ,  H02J17/00 ,  H02J50/10 ,  H02J50/90 ,  H03H7/40

Abstract: A receiver device in a coupled coil system for wireless energy transfer includes a receiver coil and a load device operatively connected to the receiver coil and configured to receive a signal from the receiver coil. As one example, the load device is a rechargeable battery. An adjusting filter is included in the receiver device and is operatively connected between the receiver coil and the load device. The adjusting filter can be used to transform the effective resistance or impedance of the load as presented to the transformer during energy transfer so that the effective resistant or impedance of the load is maintained at a substantially constant level, and the signal received by the load device is maintained at a substantially constant level.