公开(公告)号：US11159054B2

公开(公告)日：2021-10-26

申请号：US16513583

申请日：2019-07-16

Applicant: Apple Inc.

Inventor： Christopher M. Pinciuc ,  Dmitry Berdnikov ,  Jukka-pekka J. Sjoeroos ,  Sumant Ranganathan ,  Weihong Qiu ,  Zaki Moussaoui

IPC: H02J50/40 ,  H02J50/12 ,  H02J7/02 ,  H01F38/14 ,  H02J50/90 ,  H02J50/60

Abstract: A power system has a wireless power transmitting device and a wireless power receiving device. Coils in the transmitting device may include a circular coil overlapped by first and second rectangular coils at a charging surface. The rectangular coils each include straight segments extending over a central region of the circular coil. Control circuitry can activate the circular coil to transmit wireless power to a first type of wireless power receiving coil using vertical components of the magnetic field generated by the circular coil. The control circuitry can activate the rectangular coils to transmit wireless power to a second type of wireless power receiving coil using horizontal components of the magnetic field generated by the rectangular coils. The circular and rectangular coils wirelessly charge the power receiving device while located at the same position on the charging surface, regardless of the type of wireless power receiving coil that is used.

公开(公告)号：US11050307B1

公开(公告)日：2021-06-29

申请号：US16798167

申请日：2020-02-21

Applicant: Apple Inc.

Inventor： Weihong Qiu ,  Dmitry Berdnikov ,  Zaki Moussaoui

IPC: H02J50/90 ,  H02J50/40 ,  H02J50/12

Abstract: A wireless power system has a wireless power transmitting device such as a charging mat with a charging surface and a wireless power receiving device that receives wireless power from coils overlapped by the charging surface. The wireless power transmitting device receives load current and load voltage measurements from the wireless power receiving device and uses this information to produce one or more load lines. The load lines may form a family of load lines each associated with a different respective duty cycle used by inverter circuitry in the wireless power transmitting device in transmitting wireless power signals using the coils. The control circuitry can determine whether the wireless power receiving device has moved by comparing current and voltage information from the wireless power receiving device to the family of load lines and can take appropriate action such as measuring coil inductances for use in subsequent coil selection operations.

公开(公告)号：US20200321811A1

公开(公告)日：2020-10-08

申请号：US16909904

申请日：2020-06-23

Applicant: Apple Inc.

Inventor： Nan Liu ,  Dmitry Berdnikov ,  Weihong Qiu ,  Zaki Moussaoui

IPC: H02J50/80 ,  H02J50/10

Abstract: A wireless power system may have a wireless power transmitting device and a wireless power receiving device. The wireless power receiving device may have a receive coil that receives wireless power signals from the wireless power transmitting device and may have a rectifier that produces direct-current power from the received wireless power signals. The wireless power transmitting device may have an array of transmit coils. Each transmit coil has a respective magnetic coupling coefficient characterizing its magnetic coupling with the receive coil. The wireless power transmitting device may have control circuitry that uses the magnetic coupling coefficient values in selecting transmit coils to use in transmitting wireless power to the wireless power receiving device.

公开(公告)号：US20200044491A1

公开(公告)日：2020-02-06

申请号：US16196975

申请日：2018-11-20

Applicant: Apple Inc.

Inventor： Weihong Qiu ,  Nan Liu ,  Dmitry Berdnikov ,  Zaki Moussaoui ,  Rex Huang

IPC: H02J50/80 ,  H02J7/02 ,  H02J50/12 ,  H02J50/40

Abstract: A wireless power transmission system has a wireless power receiving device that can be charged using multiple different types of wireless power transmitting devices. The different types of wireless power transmitting devices have power transmitting coils that exhibit different levels of magnetic coupling with the power receiving coil of the wireless power receiving device. The wireless power receiving device may include capacitors, resistors, and/or other loading circuits that can be independently switched into use depending on the level of magnetic coupling that is detected, on a rectified voltage level, on the size of the output load, and/or on information conveyed during handshaking operations to present a desired impedance adjustment at the power receiving coil so that data signal can be properly conveyed between the power receiving device and the power transmitting device.