Apple Inc.
Wireless power system with power control

Abstract:

A wireless power system has a wireless power transmitting device and a wireless power receiving device. The wireless power transmitting device and wireless power receiving device may include control circuitry that measures operating parameters. During wireless power transmission operations, the wireless power receiving device may periodically send feedback to the wireless power transmitting device such as in-band wireless power adjustment commands requesting that the wireless power transmitting device adjust the amount of power being transmitted from the wireless power transmitting device to the wireless power receiving device. Faster estimates of desired adjustments to the amount of transmitted power can be made by the wireless power transmitting device using real-time measurements of wireless power transmitting device coil current and wireless power transmitting device coil voltage.