Patent ID: 9425864
Filing Date: 2016-08-23
CPC Classification: H01F,H02J,H04B

Claim Text:
1. A power transmitter for transferring power to a power receiver using a wireless inductive power signal, the power transmitter comprising: an inductor for providing the power signal; a power signal generator for driving the inductor to provide the power signal; a receiver for receiving data messages from the power receiver; a transmitter for transmitting data to the power receiver by modulating the power signal with a message; wherein the data messages are communicated by load of the power signal in repeating load modulation intervals, the repeating load modulation intervals being separated by intervening time intervals, and wherein the transmitter is arranged to modulate a single bit of the message across a plurality of the intervening time intervals in accordance with a predetermined modulation pattern, the modulation pattern defining modulation deviations to apply to the power signal in each of the plurality of intervening time intervals.