Apple Inc.

Junbo Zeng

Arunim Kumar

Lewis Freeth Harpham

Sander Vocke

Ya-Ting Wang

Paul David Marson

Aaron Rex Keith

Saining Ren

Daniel James Robertson

Ali Abdolkhani

Ron Rafer Floresca

Eugenio Jr Sia Lecias

Michael Nasa

A system for inductive power transfer that may selectively transmit power in a plurality of modes based on characteristics of a power receiver and determine which transmitter coils to drive based on received signal strength information. The inductive power transfer transmitter may detect characteristics of the power receiver in order to control the mode of the power transfer and selectively control which transmitter coils are driven based on signal strength information received from a power receiver. The power transmitter may have slugs formed of a magnetically permeable material within common coil winding openings and the transmitter coils may consists of a plurality of parallel windings.

System and method for power transfer

An inductive power transfer device including: a resonant circuit, having a power transfer coil and a power transfer capacitor; a coupling coil, magnetically-coupled to the power transfer coil; a variable impedance; and a controller configured to determine the impedance value of the variable impedance based on predetermined criteria including: substantially regulating power provided to a load; tuning the resonant circuit resonant frequency substantially to a predetermined frequency; adjusting a frequency of a magnetic field associated with the power transfer coil; and/or adjusting an impedance reflected by the power transfer coil to a corresponding coupled power transfer coil.

Coupled-coil power control for inductive power transfer systems

Growing community of inventors

Auckland, New Zealand

Junbo Zeng