公开(公告)号：US20180233942A1

公开(公告)日：2018-08-16

申请号：US15655628

申请日：2017-07-20

Applicant: Apple Inc.

Inventor： Weihong Qiu ,  Mehmet K. Nalbant ,  Zaki Moussaoui

IPC: H02J7/02 ,  H02J50/12

CPC classification number: H02J7/027 ,  H02J7/025 ,  H02J50/10 ,  H02J50/12

Abstract: A wireless power transmitting device transmits wireless power signals to a wireless power receiving device. The wireless power receiving device has a rectifier and a wireless power receiving coil that receives wireless power signals. The rectifier is coupled to an integrated circuit such as a battery charger integrated circuit. One or more capacitors are coupled between input terminals for the rectifier and the wireless power receiving coil. The rectifier has output terminals at which the rectifier provides direct-current output power corresponding to the wireless power signals received with the wireless power receiving coil. Protection circuitry is coupled to one or more nodes located between the wireless power receiving coil and the capacitors. Control circuitry turns on one or more transistors in the protection circuitry in response to measurements made with sensor circuitry coupled to the output terminals.

公开(公告)号：US20180219405A1

公开(公告)日：2018-08-02

申请号：US15884199

申请日：2018-01-30

Applicant: Apple Inc.

Inventor： Weihong Qiu ,  Rohan Dayal ,  Zaki Moussaoui

IPC: H02J7/02 ,  H02J50/12

CPC classification number: H02J7/025 ,  H02J50/12 ,  H02J50/40 ,  H04B5/0037 ,  H04B5/0075

Abstract: A wireless power transmitting device transmits wireless power signals to a wireless power receiving device by supplying drive signals with a duty cycle to a wireless power transmitting coil. The wireless power receiving device has a rectifier and a wireless power receiving coil that receives wireless power signals having the duty cycle from the wireless power transmitting device. The rectifier is coupled to an integrated circuit such as a battery charger integrated circuit. The amount of current drawn by the integrated circuit from the rectifier is adjustable. During operation, control circuitry in the wireless power receiving device sets the current to multiple different values while using sensor circuitry to measure output power from the rectifier. A satisfactory value for the duty cycle can be identified by adjusting the duty cycle while observing when peaks in the output power arise as a function of the different current values.

公开(公告)号：US20180069601A1

公开(公告)日：2018-03-08

申请号：US15697151

申请日：2017-09-06

Applicant: Apple Inc.

Inventor： Weihong Qiu ,  Stefan A. Kowalski ,  Christopher S. Graham ,  Eric S. Jol ,  Zaki Moussaoui ,  Nan Liu

IPC: H04B5/00 ,  H02J7/02 ,  H02J50/10

CPC classification number: H04B5/0037 ,  H01F27/2823 ,  H01F27/365 ,  H01F27/38 ,  H01F38/14 ,  H02J7/025 ,  H02J50/10 ,  H02J50/40 ,  H04B5/0087

Abstract: This disclosure relates to the inductive charging of portable electronic devices. In particular, a charging assembly is disclosed that allows a portable electronic device to be charged in multiple orientations with respect to a charging device. The charging assembly includes two or more separate inductive receiving coils. The inductive receiving coils can be arranged orthogonally with respect to one another by wrapping one or more secondary receiving coils around a ferritic core having two legs extending in different directions from a joint region. By orienting the receiving coils orthogonally with respect to one another, the likelihood of at least one of the receiving coils being aligned with a charging field emitted by a charging device increases substantially.

公开(公告)号：US20170093269A1

公开(公告)日：2017-03-30

申请号：US15064501

申请日：2016-03-08

Applicant: Apple Inc.

Inventor： Weihong Qiu ,  Rohan Dayal ,  Zaki Moussaoui

IPC: H02M1/08

CPC classification number: H02M1/083 ,  H02M3/33569 ,  H02M3/3376 ,  H02M2001/0032 ,  H02M2001/0058 ,  Y02B70/1491 ,  Y02B70/16

Abstract: This disclosure relates to improved designs for phase-shift power converters, and, in particular, full bridge converters. Phase-shift power converters may lose Zero-Voltage-Switching (ZVS) under some load conditions, e.g., light load conditions—which can result in large switching losses. In order to avoid these losses, additional LC tank circuits may be added into the system to generate an amount of negative current needed to maintain ZVS. However, permanently adding such LC tank circuits into the system will reduce the system's efficiency. By intelligently adjusting the number (and particular combination) of LC tank circuits included in the system at a given time, ZVS may be maintained under all load conditions, while the impact of the additional LC tank circuits on the converter's overall efficiency may be limited, e.g., by employing the minimum number of LC tank circuits for the minimum amount of time needed to maintain ZVS.