Importance

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Abstract

A power transmitter (101) provides power to a power receiver (105) via a power transfer signal generated by a drive signal fed to a transmitter coil (103). A first controller (209) of the power transmitter (101) controls a parameter of the drive signal in accordance with a first mode which comprises operating a power control loop to control the power transfer signal in response to power control error messages received from the power receiver (105). A second controller (211) controls the parameter of the drive signal in accordance with a second mode which comprises setting the parameter of the drive signal in response to at least one power transfer signal setpoint received from the power receiver (105). A circuit (213) selects between the first mode of operation and the second mode of operation in response to a power transfer control mode request received from the power receiver (105) and a timing circuit (215) varies a timing parameter for the communication time intervals between the two modes of operation.

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First Claim