公开(公告)号：US20200274396A1

公开(公告)日：2020-08-27

申请号：US16285074

申请日：2019-02-25

Applicant: Renesas Electronics America Inc.

Inventor： Nicholaus Wayne SMITH

IPC: H02J50/12 ,  H02J7/02 ,  H01F38/14 ,  H01F27/28 ,  G01R27/26

Abstract: In accordance with embodiments of the present invention, a wireless power transmitter includes a transmit coil that includes a plurality of concentric coils; a switch circuit coupled to the plurality of concentric coils; a driver coupled to provide a voltage to the switch circuit; and a controller coupled to the switch circuit, the controller providing control signals to the switch circuit selecting to provide the voltage across one or more of the plurality of concentric coils depending on a Q-factor measuring in the presence of a receive coil. A method of operating a wireless power transmitter includes determining a measured Q-factor for each of a plurality of configurations of concentric transmit coils; determining a difference between each of the measured Q-factors and a standard Q-factor; and selecting one of the plurality of configurations based on the differences.

公开(公告)号：US20220205816A1

公开(公告)日：2022-06-30

申请号：US17319659

申请日：2021-05-13

Applicant: Renesas Electronics America Inc.

Inventor： Gustavo James MEHAS ,  Damla ACAR ,  Ashley DE WOLFE ,  Pooja AGRAWAL ,  Nicholaus Wayne SMITH

IPC: G01D5/20 ,  G06F3/03 ,  H04M1/02

Abstract: A method and a system may inductively determine a position of a display screen of a computing device. Associated processes may generate a magnetic field by providing an alternating current to a driver coil, and may generate a voltage at a sensor coil in response to the magnetic field. The system and method may additionally include determining a position of the display screen by executing an algorithm at a processor. An input to the algorithm may include voltage data associated with the voltage generated at the sensor coil.