公开(公告)号：US11677255B1

公开(公告)日：2023-06-13

申请号：US17644005

申请日：2021-12-13

Applicant: Apple Inc.

Inventor： Ye Li ,  Antoin J. Russell ,  Stephen C. Terry ,  Adam L. Schwartz ,  Sumant Ranganathan ,  Gianpaolo Lisi

IPC: H02J7/00 ,  H02J50/70 ,  H02J50/80 ,  H02J50/12

CPC classification number: H02J7/00711 ,  H02J50/12 ,  H02J50/70 ,  H02J50/80

Abstract: A wireless power transmitter can include a coil, an inverter coupled to the coil, and control circuitry coupled to the inverter that, responsive to receiving a burst request pulse from a wireless power receiver, initiates inverter operation, driving the coil and powering the receiver. The control circuitry can operate inverter switches so bandwidth of the wireless power transfer signal falls within a specified range by: (a) extending a minimum on time of the switches, (b) modifying pulse width modulation (PWM) drive signals supplied to the switches to shape a coil current burst envelope, and/or (c) modifying PWM signal amplitude supplied to the switches. Modifying the PWM drive signals can include using a symmetrical PWM scheme in which the positive and negative pulses are symmetrical in width on a cycle-by-cycle basis or using a complementary PWM scheme in which the positive and negative pulse widths are complementary on a cycle-by-cycle basis.

公开(公告)号：US20220263345A1

公开(公告)日：2022-08-18

申请号：US17650602

申请日：2022-02-10

Applicant: Apple Inc.

Inventor： Ruiyang Lin ,  Matthew J. Chabalko ,  Zaki Moussaoui ,  Adam L. Schwartz

IPC: H02J50/00 ,  H02J50/10 ,  H01F7/02

Abstract: An accessory for improving wireless power transfer efficiency in a wireless power transfer system can include a magnetic (e.g., ferrite) core dimensioned and positioned so as to reduce flux coupling from the PTx winding into friendly metal of the PRx and/or to enhance flux coupling from the PTx winding to the PRx winding. The core may define an aperture corresponding to an outer dimension (e.g., outer diameter) of the PRx winding. The core may further have an outer dimension selected to intercept sufficient flux to reduce flux coupling into the friendly metal of the PRx, such as an outer dimension corresponding to an outer dimension (e.g., outer diameter) of the PTx winding. The accessory may be a case for the PRx device or may be configured to be affixed to the face of the PTx device and may also include one or more alignment fixtures.

公开(公告)号：US20220247232A1

公开(公告)日：2022-08-04

申请号：US17198116

申请日：2021-03-10

Applicant: Apple Inc.

Inventor： Adam L. Schwartz ,  Alireza Safaee ,  Stephen C. Terry ,  Zhiyuan Hu

IPC: H02J50/70 ,  H02J7/02 ,  H02J50/12 ,  H02J50/60 ,  H01F38/14 ,  H01F27/36

Abstract: A wireless charging system having a power transmitter may wirelessly transfer power to a power receiver. Shield saturation, such as saturation of a ferrite structure, in the wireless power receiver may occur under some operating conditions. Saturation can lead to disruptive oscillations in power transfer. The power transmitting may include control circuitry for detecting and mitigating saturation.

公开(公告)号：US11381120B2

公开(公告)日：2022-07-05

申请号：US16868120

申请日：2020-05-06

Applicant: Apple Inc.

Inventor： Adam L. Schwartz ,  Ron Rafer C. Floresca ,  Liang Chen ,  Zaki Moussaoui

IPC: G07C9/00 ,  B60L53/12 ,  H02J50/70 ,  H02J50/80 ,  H04B5/00 ,  H02J50/10 ,  B60R25/24 ,  B60R25/33 ,  H02J7/02

Abstract: An electronic device such as a portable electronic device has wireless power receiving circuitry. A vehicle has a vehicle remote keyless system that transmits beacons. A key receives the beacons and responds with key codes to unlock doors and enable a vehicle ignition in the vehicle. In the presence of wireless power transfer operations there is a risk that wireless power signals will interfere with the reception of the beacons by the key. To ensure that beacons are satisfactorily received, conditions in which there is a risk of interference are detected and corresponding interference mitigation operations are performed.

公开(公告)号：US11056928B2

公开(公告)日：2021-07-06

申请号：US16868077

申请日：2020-05-06

Applicant: Apple Inc.

Inventor： Adam L. Schwartz ,  Ron Rafer C. Floresca ,  Liang Chen ,  Zaki Moussaoui

IPC: H02J50/70 ,  H02J50/80 ,  H04B5/00 ,  G07C9/00 ,  H02J50/10 ,  B60R25/24 ,  B60R25/33 ,  H02J7/02

Abstract: An electronic device such as a portable electronic device has wireless power receiving circuitry. A vehicle has a vehicle remote keyless system that transmits beacons. A key receives the beacons and responds with key codes to unlock doors and enable a vehicle ignition in the vehicle. In the presence of wireless power transfer operations there is a risk that wireless power signals will interfere with the reception of the beacons by the key. To ensure that beacons are satisfactorily received, conditions in which there is a risk of interference are detected and corresponding interference mitigation operations are performed.

公开(公告)号：US20210167637A1

公开(公告)日：2021-06-03

申请号：US17109793

申请日：2020-12-02

Applicant: Apple Inc.

Inventor： Adam L. Schwartz ,  Niloofar Rashidi Mehrabadi ,  Hossein Sepahvand

IPC: H02J50/60 ,  H02J50/80 ,  H02J50/70 ,  H02J50/12

Abstract: A wireless power system has a wireless power transmitting device and a wireless power receiving device. The wireless power transmitting device uses a wireless power transmitting coil to transmit wireless power signals to the wireless power receiving device. The wireless power transmitting device determines whether an external object is present. The external object may be a foreign object such as a coin or paperclip or may be a wireless power receiving device. External objects are detected using quality-factor measurements. Wireless communications are used to discriminate between foreign objects and wireless power receiving devices. Quality factor measurements may be compensated for aging and temperature effects using temperature measurements and compensation factors based on frequency and measured resistance.